With me, it's the AC-4's I have run a switch to the MS-4 to channel to the speaker whichever rig I'm using at the moment. They take up space. The AC-4's sit on the floor and don't complain much ;-)
Speaking of which, I will have one AC-4 with the 120/240 switch option available. To folks on here, $175 + shipping and I will ship to Europe/Oz if you will put up with my b!tchings about the paperwork. I haven't touched this one other than run it as my backup bench supply, so it is working but not rebuilt.
Let me know, as I am going to unleash a fairly good assortment of stuff onto the online auction site that shall remain unnamed...
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with Proton Mail secure email.
toggle quoted message
Show quoted text
On Tuesday, December 31st, 2024 at 4:11 PM, Lyndon VE7TFX <lyndon@...> wrote: VE7PS via groups.io writes:
Besides...pretty sure there is one spare
MS-4 already lying under a desk somewhere.
That's the problem with MS-4s. They accrete in corners and under
tables, out of visible sight lines. It wasn't until a couple of
months ago I discovered I had four of the bloody things! None of
which I have space for on the radio desk. I'm keeping the nicest
one, and have sold two of the others. One to go ...
--lyndon
|
Hi Stan,
All that was ever installed for an R-4B here in the lab were a few PD-4 product detectors. The AMP-4 needs a good 12 to 14 volt supply at several hundred mA that doesn't exist in an R-4B. While the AGC attack distortion was much less with the PD-4, the audio distortion was still there with the audio output tube. The tube amp wasn't as distortion free as I expected.
Let¡¯s see if the updated Gerber files make it to Colorado and go from there. There are some parts for all the kits that have become harder to source from new old stock. I would of course be more than happy to see someone run a new batch of boards.
Attached is a PDF for installing a PD-4 in an R-4B. As to coming up with 12 volts, could a voltage doubler be used off the filament line? It might be worth considering use of a less power hungry LM-380 instead of my LM-383 circuit for the R-4C. 100 mW of power is pretty loud into an MS-4 or MS-7 speaker.
Rob, NC0B
toggle quoted message
Show quoted text
-----Original Message-----
From: Stan Gammons [mailto:buttercup11421@...]
Sent: Tuesday, December 31, 2024 3:16 PM
To: Rob Sherwood.
Subject: Drake mods
Hi Rob,
I saw the thread on the Drake-radio group about mods you had for the R4C
and gerber files for the boards. What mods did you offer for the Drake
R4B?? Hopefully one to get rid of the really hot running audio tube.? If
so, would you be willing to share that mod and possibly the gerber files
to make the board?
Happy New Year!
73
Stan
KM4HQE
|
Re: Cinch Jones 12 pin NEW old surplus (NOS) radio gear connectors as pictured 4 avail - Just Listed
On Tue, 31 Dec 2024, VE7PS via groups.io wrote: Yeah I thought about that MS-4 and if we had met at a fleamarket I probably
WOULD have picked it up...but shipping adds silly cost now and thought
better of it. I'll take a look next weekend but I doubt I could find a
place for it in either shacks. Besides...pretty sure there is one spare
MS-4 already lying under a desk somewhere. I must report with great shame that I have two MS-4s and I hooked one of them to my badly wounded ICOM IC-735. Discraseful, it is like Queen Camilla turning to prostitution to pay her cellphone bill. -- Richard Loken VE6BSV : "...underneath those tuques we wear, Athabasca, Alberta Canada : our heads are naked!" ** rlloken@... ** : - Arthur Black
|
I don¡¯t know how it can read 1.3 MHz if not oscillating¡
Yes, the lo band VCO should change frequency if you pill RFC502 to ground, pulling the varactor drive from ~21 volts to zero volts.
Gary
toggle quoted message
Show quoted text
On Dec 31, 2024, at 3:12?PM, Jim Harris via groups.io <radiove1rb@...> wrote:
Do you mean on the low VCO will drop as I don¡¯t think the high VCO is oscillating as it reads 1.3 mhz and dies not change when I put a ground on RFC 505. Also those voltages on the test pint do not change when the I change from the low VCO to the high one. I will test again.?
Jim VE1RB On Tue, Dec 31, 2024 at 3:33?PM Gary Follett via ??<xntrick1948= [email protected]> wrote: Those voltages will inly read correctly if the PLL loop is closed. Do you have enough extenders to put the radio into operating condition?
The way you have it operating, the output at the test point is simply ramping up to the maximum that can be produced by U504 in an open loop condition.
However, the high band VCO should also go high in frequency with ~21 volts on RFC505.
I assume that, if you short RFC502 (lo band VCO) to ground, the frequency you read drops from the 65 MHz quite a lot.
Gary
W0DVN?
Hi Gary, I did the ground on RFC505 and no change except that the voltage goes very low of course going through a 100K resistor. The frequency counter shows 1.3 MHz on the output of the VCO when it is on 10 or 15 meters. When I switch to 14 MHz it pops up to 65 MHz but it is not connect to the translator board just plugged into my extenders.? I did a voltage check at the test point off of CR515, CR516, CR517, and CR518 and here is what I got, Way off. 1.5 MHZ 21.24 VDC Looks like it should be 3 volts. the photocopy is heard to read. 14.0 MHz 21.20 VDC Looks like it should be maybe 15 volts 21.0 MHZ 21.17 VDC and looks like it should be 6 Volts 29.5 MHZ 21.15 VDC and looks like it should be 14.5 volts Maybe I am way off Gary but hope that maybe that helps. Almost looks like something it shorted? I don't know where to go next so any help appreciated. Thanks.
73, Jim VE1RB
On 2024-12-30 13:42, Gary Follett via??wrote:
That is WAY too high!!
The maximum that should be seen at this point is ~15 volts, the high end of 10 meters. 20 volts here would push the VCO to its maximum frequency, if it is running at all.?
Is there any RF signal coming out of the VCO? You may have answered this previously but I seem to have forgotten the answer. If there IS RF, here, what is its frequency?
Something is telling the PLL phase detector to put out a voltage thinking that the frequency is too low, which is why the voltage on RFC505 is so high.
Can you short RFC505 cold end to ground? This SHOULD make the VCO, if it is operating, go to the low end of its range in frequency. This point is fed via a 100K resistor from U504B so this will not hurt anything.
Gary
W0DVN
PS: Not taking into account C516 and C517, I had previously stated that voltage across the tuning diodes depended one the voltage at Q504 Drain. This was an error on my part. Those two capacitors isolate the DC on the tuning diodes from the Drain of the oscillator FET.
Cn you short?
Gary I just checked that voltage again with the band switch on 10 meters and the DC voltage at that RFC505 is 20.52 DC. Hope that helps.
Jim VE1RB On Sun, Dec 29, 2024 at 8:37?PM Gary Follett via ??<xntrick1948= [email protected]> wrote: What is the voltage on RFC 505?
Gary
W0DVN
Worked on the VCO board today and founds that the 5 volt regulator is working just fine 5.02 VDC. So am thinking about it trying to decide what I check next. Might make a chart of voltages on the transistors from the working one and compare to the non working section.
73, Jim Ve1RB On Sat, Dec 28, 2024 at 11:08?PM Gary Follett via ??<xntrick1948= [email protected]> wrote: The power supply that is the subject of this issue is the 7805 regulator on the VCO board. That is the one that denies power to just the one VCO (high bands, in this case) when it fails.
Regards,
Gary
W0DVN On Dec 28, 2024, at 8:28?PM, Tony N5DIM < tony@...> wrote:
The WB4HFN website has a section with great information related to that power supply board. I just used it to resurrect a TR7 that was DOA. Good luck. 73 Tony N5DIM? On Dec 28, 2024, at 5:52?PM, Gary Follett via??<xntrick1948=[email protected]> wrote:
?Sounds like you are on the right track. Don¡¯t ocelot the electrolytic capacitors on that supply as well.
Gary
W0DVN
Gary, I found a few minutes to work on the TR7 and discovered that the high VCO is not working at all. It does have the 10 vdc supply switch?on it but I don't know if that reulagor?is working or not. I will check it out but have to work on getting the metal shield off. I Hope that is the problem but I will work on it maybe tomorrow. Thanks for all your help.
73, Jim VE1RB On Fri, Dec 27, 2024 at 9:06?PM Gary Follett via ??<xntrick1948= [email protected]> wrote: It is worth asking, did the failure of your VCO board (displaying 51.950) occur on its own? That is to ask, did the radio work properly and then just fail or has it, as long as you have had it, always operated with this fault??
If it once worked for you and then failed, then it would make sense to see what gets disconnected if those pins are not in line ?and look for a way that same thing could happen without the pin alignment problem.
The pin alignment fix is pretty easy though, if the board alignment is the cause. It just SOUNDS difficult.
That whole DR7 was always a source of issues due to its complexity and difficulty of installation. I don¡¯t know how a DR7 could even endure the stresses of removal and reinsertion more than once!
Gary?
W0DVN
Thanks Tom. I printed that off but hope that is not the problem.
73, Jim VE1RB In 2010 there was a thread regarding the Drake TR-7 display showing 51950.0 on the old retired Drakelist.
The thread is archived at?
Please click the link so the owner knows that we find the archive useful.
Hope this helps. Tom, AG9X
================? Below are the posts from Brian Koontz WA3ITE, Jim Shorney NU0C and Garey Barrell K4OAH (SK)? (just in case Drake TR-7 DR-7 problems outlive the??site)
Re: [Drakelist] Almost there: TR-7 display issues -- FIXED!
Brian Koontz Fri, 30 Jul 2010 20:36:54 -0700
Well, the TR-7 from hell is now a fully operational TR-7 from hell!
In preparation for some signal tracing, I decided to extend the DR-7
board using the extenders I have.? To do this, you have to unmount the
two voltage regulators mounted to the chassis, and jumper the
connector farthest to the right. ?(I didn't bother connecting the
up/down band buttons.) ?Lo and behold, the display worked!?
Some further investigation revealed that the chassis has warped over
the years, so the two 3-prong connectors on the VCO board were no
longer in a horizontal line.? So I was determined to make sure the
board was fully seated on all the connectors.
To do this, I had to drop the front panel.? Not a major chore, just
one knob to remove (the band knob) and 6 side screws. With that now
out of the way, it was an easy job to determine if all the pins were
where they belonged.? The only snag was that the front panel, when
canted downwards, angles the PTO can upwards.? So you have to hold the
front panel perpendicular and steady with slight downward pressure to
fully seat the board.? Once all the pins were visually confirmed to be
seated, I remounted the front panel, reattached the regulators and all
the connectors, and fired the rig up.? Everything now seems to work!
It turns out the original DR-7 board was indeed defective as well
(possibly because it had been seated incorrectly).? And a visual
confirmation from topside indicates the chassis is, indeed, warped:
The screw hole is misaligned with the mounting hole in the board.?
So, for archival purposes in case anyone else decides to search for
this problem: ?If the display if fixed on "51950", one possible cause
is that one or more DR-7 pins, possibly the VCO pins, are not
correctly seated.? The best solution is to drop the front panel and
confirm visually that the pins are fully seated.
Now it's time to get on the air!
??--Brian/WA3ITE
=================?
Jim Shorney Fri, 30 Jul 2010 23:17:58 -0700
On Fri, 30 Jul 2010 20:40:52 -0500, Brian Koontz wrote:
>Well, the TR-7 from hell is now a fully operational TR-7 from hell!
>
>Now it's time to get on the air!
Congratulations, Brian! You have been assimilated into the collective.
Resistance is futile.
73
-Jim
================= ? Garey Barrell ?k4oah@...?via ?Sat, Jul 31, 2010, 8:34?AM to drakelist Brian Koontz wrote: > Some further investigation revealed that the chassis has warped over > the years, so the two 3-prong connectors on the VCO board were no > longer in a horizontal line.? So I was determined to make sure the > board was fully seated on all the connectors. > > > > So, for archival purposes in case anyone else decides to search for > this problem: ?If the display is fixed on "51950", one possible cause > is that one or more DR-7 pins, possibly the VCO pins, are not > correctly seated.? The best solution is to drop the front panel and > confirm visually that the pins are fully seated. >
Brian -
Congratulations!! ? It's always nice when one 'comes together'.
Just as an aside, someone suggested earlier (and correctly) that the
"51950" problem may indicate a loss of the 500 kHz reference signal.?
You might find it interesting that the left-most three pin connector on
the VCO board is the 500 kHz reference signal!
Those pins on the bottom of the DR-7 are ALWAYS a problem, ya' just
can't see 'em!!
Your 'trials' have been an interesting 'trip' for others, thanks for
documenting it for us all.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& ?TR-4/C Service Supplement CDs
<>
=================
? Search terms to make this post easier to find:? Drake TR-7 TR7 DR-7 DR7 display frozen locked stuck ? 51950?? 51,950?? 51 950?? 5195? 51950.0 ? 51,950.0 ? 51 950 0
???
|
Re: VE3EFJ third mixer mod for the R4C
Hi Glenn,
?
In 2022 there was an attempt to have Harbach Electronics offer the boards and a parts kit.? My old Gerber files were not readable by most current PCB programs.?
A ham in Germany was able to get my old Gerber files converted to current formats.? By the time that problem was solved Harbach had lost interest.? I just sent an email to Dieter asking if he could locate the updated Gerber files and send them to me.? If this
can be accomplished I would be happy to turn them over to anyone who was interested in running another batch of boards.? Call me if you want to chat.
?
Rob, NC0B
303-995-2749 cell
?
?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]]
On Behalf Of Glenn W2BX via groups.io
Sent: Tuesday, December 31, 2024 11:24 AM
To: [email protected]
Subject: Re: [DRAKE-RADIO] VE3EFJ third mixer mod for the R4C
?
You wrote, "My MIX-4 has a J309 FET properly coupled to the 5695 kHz IF tuned circuit, and separate ports on the NE602 Gilbert Cell mixer for the IF and the LO
injections"
Have you given anyone permission to reproduce the PCB's for your R-4C mods? I would love to install all of them in my 4C. The parts can be sourced but PCB's would
be needed.
|
Do you mean on the low VCO will drop as I don¡¯t think the high VCO is oscillating as it reads 1.3 mhz and dies not change when I put a ground on RFC 505. Also those voltages on the test pint do not change when the I change from the low VCO to the high one. I will test again.?
Jim VE1RB
On Tue, Dec 31, 2024 at 3:33?PM Gary Follett via <xntrick1948= [email protected]> wrote: Those voltages will inly read correctly if the PLL loop is closed. Do you have enough extenders to put the radio into operating condition?
The way you have it operating, the output at the test point is simply ramping up to the maximum that can be produced by U504 in an open loop condition.
However, the high band VCO should also go high in frequency with ~21 volts on RFC505.
I assume that, if you short RFC502 (lo band VCO) to ground, the frequency you read drops from the 65 MHz quite a lot.
Gary
W0DVN?
Hi Gary, I did the ground on RFC505 and no change except that the
voltage goes very low of course going through a 100K resistor. The
frequency counter shows 1.3 MHz on the output of the VCO when it
is on 10 or 15 meters. When I switch to 14 MHz it pops up to 65
MHz but it is not connect to the translator board just plugged
into my extenders.? I did a voltage check at the test point off of
CR515, CR516, CR517, and CR518 and here is what I got, Way off. 1.5 MHZ 21.24 VDC Looks like it should be 3 volts. the photocopy
is heard to read. 14.0 MHz 21.20 VDC Looks like it should be maybe 15 volts 21.0 MHZ 21.17 VDC and looks like it should be 6 Volts 29.5 MHZ 21.15 VDC and looks like it should be 14.5 volts Maybe I am way off Gary but hope that maybe that helps. Almost
looks like something it shorted? I don't know where to go next so
any help appreciated. Thanks.
73, Jim VE1RB
On 2024-12-30 13:42, Gary Follett via
wrote:
That is WAY too high!!
The maximum that should be seen at this point is ~15 volts,
the high end of 10 meters. 20 volts here would push the VCO to
its maximum frequency, if it is running at all.?
Is there any RF signal coming out of the VCO? You may have
answered this previously but I seem to have forgotten the
answer. If there IS RF, here, what is its frequency?
Something is telling the PLL phase detector to put out a
voltage thinking that the frequency is too low, which is why the
voltage on RFC505 is so high.
Can you short RFC505 cold end to ground? This SHOULD make the
VCO, if it is operating, go to the low end of its range in
frequency. This point is fed via a 100K resistor from U504B so
this will not hurt anything.
Gary
W0DVN
PS: Not taking into account C516 and C517, I had previously
stated that voltage across the tuning diodes depended one the
voltage at Q504 Drain. This was an error on my part. Those two
capacitors isolate the DC on the tuning diodes from the Drain of
the oscillator FET.
Cn you short?
Gary
I just checked that voltage again with the band switch
on 10 meters and the DC voltage at that RFC505 is 20.52
DC. Hope that helps.
Jim VE1RB
On Sun, Dec 29, 2024
at 8:37?PM Gary Follett via ??<xntrick1948= [email protected]>
wrote:
What is the voltage on RFC 505?
Gary
W0DVN
Worked
on the VCO board today and founds that the
5 volt regulator is working just fine 5.02
VDC. So am thinking about it trying to
decide what I check next. Might make a
chart of voltages on the transistors from
the working one and compare to the non
working section.
73, Jim Ve1RB
On Sat,
Dec 28, 2024 at 11:08?PM Gary Follett
via ??<xntrick1948= [email protected]>
wrote:
The power supply that is the
subject of this issue is the 7805
regulator on the VCO board. That is
the one that denies power to just the
one VCO (high bands, in this case)
when it fails.
Regards,
Gary
W0DVN
On Dec 28, 2024, at
8:28?PM, Tony N5DIM < tony@...> wrote:
The WB4HFN
website has a section with
great information related to
that power supply board. I
just used it to resurrect a
TR7 that was DOA. Good luck.
73 Tony N5DIM?
On
Dec 28, 2024, at
5:52?PM, Gary Follett
via??<xntrick1948=[email protected]> wrote:
?Sounds
like you are on the
right track. Don¡¯t
ocelot the electrolytic
capacitors on that
supply as well.
Gary
W0DVN
Gary,
I found a few
minutes to
work on the
TR7 and
discovered
that the high
VCO is not
working at
all. It does
have the 10
vdc supply
switch?on it
but I don't
know if that
reulagor?is
working or
not. I will
check it out
but have to
work on
getting the
metal shield
off. I Hope
that is the
problem but I
will work on
it maybe
tomorrow.
Thanks for all
your help.
73, Jim
VE1RB
On Fri, Dec 27, 2024 at 9:06?PM Gary Follett via ??<xntrick1948= [email protected]>
wrote:
It is
worth asking,
did the
failure of
your VCO board
(displaying
51.950) occur
on its own?
That is to
ask, did the
radio work
properly and
then just fail
or has it, as
long as you
have had it,
always
operated with
this fault??
If it
once worked
for you and
then failed,
then it would
make sense to
see what gets
disconnected
if those pins
are not in
line ?and look
for a way that
same thing
could happen
without the
pin alignment
problem.
The pin
alignment fix
is pretty easy
though, if the
board
alignment is
the cause. It
just SOUNDS
difficult.
That
whole DR7 was
always a
source of
issues due to
its complexity
and difficulty
of
installation.
I don¡¯t know
how a DR7
could even
endure the
stresses of
removal and
reinsertion
more than
once!
Gary?
W0DVN
Thanks
Tom. I printed
that off but
hope that is
not the
problem.
73, Jim
VE1RB
In 2010
there was a
thread
regarding the
Drake TR-7
display
showing
51950.0 on the
old retired
Drakelist.
The
thread is
archived at?
Please
click the link
so the owner
knows that we
find the
archive
useful.
Hope this
helps.
Tom, AG9X
================?
Below are
the posts from
Brian Koontz
WA3ITE, Jim
Shorney NU0C
and Garey
Barrell K4OAH
(SK)?
(just in
case Drake
TR-7 DR-7
problems
outlive the??site)
Re:
[Drakelist]
Almost there:
TR-7 display
issues --
FIXED!
Brian Koontz
Fri, 30 Jul
2010 20:36:54
-0700
Well, the TR-7
from hell is
now a fully
operational
TR-7 from
hell!
In preparation
for some
signal
tracing, I
decided to
extend the
DR-7
board using
the extenders
I have.? To do
this, you have
to unmount the
two voltage
regulators
mounted to the
chassis, and
jumper the
connector
farthest to
the right. ?(I
didn't bother
connecting the
up/down band
buttons.) ?Lo
and behold,
the display
worked!?
Some further
investigation
revealed that
the chassis
has warped
over
the years, so
the two
3-prong
connectors on
the VCO board
were no
longer in a
horizontal
line.? So I
was determined
to make sure
the
board was
fully seated
on all the
connectors.
To do this, I
had to drop
the front
panel.? Not a
major chore,
just
one knob to
remove (the
band knob) and
6 side screws.
With that now
out of the
way, it was an
easy job to
determine if
all the pins
were
where they
belonged.? The
only snag was
that the front
panel, when
canted
downwards,
angles the PTO
can upwards.?
So you have to
hold the
front panel
perpendicular
and steady
with slight
downward
pressure to
fully seat the
board.? Once
all the pins
were visually
confirmed to
be
seated, I
remounted the
front panel,
reattached the
regulators and
all
the
connectors,
and fired the
rig up.?
Everything now
seems to work!
It turns out
the original
DR-7 board was
indeed
defective as
well
(possibly
because it had
been seated
incorrectly).?
And a visual
confirmation
from topside
indicates the
chassis is,
indeed,
warped:
The screw hole
is misaligned
with the
mounting hole
in the board.?
So, for
archival
purposes in
case anyone
else decides
to search for
this problem:
?If the
display if
fixed on
"51950", one
possible cause
is that one or
more DR-7
pins, possibly
the VCO pins,
are not
correctly
seated.? The
best solution
is to drop the
front panel
and
confirm
visually that
the pins are
fully seated.
Now it's time
to get on the
air!
??--Brian/WA3ITE
=================?
Jim
Shorney Fri,
30 Jul 2010
23:17:58 -0700
On Fri, 30 Jul
2010 20:40:52
-0500, Brian
Koontz wrote:
>Well, the
TR-7 from hell
is now a fully
operational
TR-7 from
hell!
>
>Now it's
time to get on
the air!
Congratulations, Brian! You have been assimilated into the collective.
Resistance is
futile.
73
-Jim
=================
?
Garey
Barrell ?k4oah@...?via ?
Sat, Jul 31,
2010, 8:34?AM
to drakelist
Brian Koontz
wrote:
> Some
further
investigation
revealed that
the chassis
has warped
over
> the
years, so the
two 3-prong
connectors on
the VCO board
were no
> longer in
a horizontal
line.? So I
was determined
to make sure
the
> board was
fully seated
on all the
connectors.
>
>
>
> So, for
archival
purposes in
case anyone
else decides
to search for
> this
problem: ?If
the display is
fixed on
"51950", one
possible cause
> is that
one or more
DR-7 pins,
possibly the
VCO pins, are
not
> correctly
seated.? The
best solution
is to drop the
front panel
and
> confirm
visually that
the pins are
fully seated.
>
Brian -
Congratulations!! ? It's always nice when one 'comes together'.
Just as an
aside, someone
suggested
earlier (and
correctly)
that the
"51950"
problem may
indicate a
loss of the
500 kHz
reference
signal.?
You might find
it interesting
that the
left-most
three pin
connector on
the VCO board
is the 500 kHz
reference
signal!
Those pins on
the bottom of
the DR-7 are
ALWAYS a
problem, ya'
just
can't see
'em!!
Your 'trials'
have been an
interesting
'trip' for
others, thanks
for
documenting it
for us all.
73, Garey -
K4OAH
Glen Allen, VA
Drake 2-B,
4-B,
C-Line&
?TR-4/C
Service
Supplement CDs
<>
=================
?
Search
terms to make
this post
easier to
find:? Drake
TR-7 TR7 DR-7
DR7 display
frozen locked
stuck ?
51950??
51,950?? 51
950?? 5195?
51950.0 ?
51,950.0 ? 51
950 0
???
|
VE7PS via groups.io writes: Besides...pretty sure there is one spare
MS-4 already lying under a desk somewhere. That's the problem with MS-4s. They accrete in corners and under tables, out of visible sight lines. It wasn't until a couple of months ago I discovered I had four of the bloody things! None of which I have space for on the radio desk. I'm keeping the nicest one, and have sold two of the others. One to go ... --lyndon
|
Re: Cinch Jones 12 pin NEW old surplus (NOS) radio gear connectors as pictured 4 avail - Just Listed
Lyndon...
Yeah I thought about that MS-4 and if we had met at a fleamarket?I probably WOULD have picked it up...but shipping adds silly cost now and thought better of it.? I'll take a look next weekend but I doubt I could find a place for it in either shacks.? Besides...pretty sure there is one spare MS-4 already lying under a desk somewhere.
73 Peter VE7PS
Lyndon VE7TFX writes:
> Stop absconding with my connectors!? (I already mailed him and
> beat you to it! :-)
As a consolation prize, you could buy the MS-4 I have listed on
the same site.? I want that thing out of here!? I need the space
back ...
--lyndon
|
Re: Cinch Jones 12 pin NEW old surplus (NOS) radio gear connectors as pictured 4 avail - Just Listed
Lyndon....."Just tryin' to hep folks is all".
I built a stash of many different C-J connectors used in Drake gear about 25 years ago on my visits to a customer in Regina. B & E Electronics?is still there and shows C-J connectors in their online store.? Nowhere near the stock they used to have by the looks of it, but prices...in US 69 cent Canuck bucks.... still looks pretty good.
73 Peter VE7PS
VE7PS via writes:
> I have no connection with the seller, other than I used to live in Elliot
> Lake, ON 40? years ago, but this price looks pretty good to me.
Stop absconding with my connectors!? (I already mailed him and
beat you to it! :-)
--lyndon
|
Re: Cinch Jones 12 pin NEW old surplus (NOS) radio gear connectors as pictured 4 avail - Just Listed
Lyndon VE7TFX writes: Stop absconding with my connectors! (I already mailed him and
beat you to it! :-) As a consolation prize, you could buy the MS-4 I have listed on the same site. I want that thing out of here! I need the space back ... --lyndon
|
Re: Cinch Jones 12 pin NEW old surplus (NOS) radio gear connectors as pictured 4 avail - Just Listed
VE7PS via groups.io writes: I have no connection with the seller, other than I used to live in Elliot
Lake, ON 40 years ago, but this price looks pretty good to me. Stop absconding with my connectors! (I already mailed him and beat you to it! :-) --lyndon
|
Cinch Jones 12 pin NEW old surplus (NOS) radio gear connectors as pictured 4 avail - Just Listed
I have no connection with the seller, other than I used to live in Elliot Lake, ON 40? years ago, but this price looks pretty good to me.
Caveat Emptor!
73 Peter VE7PS ---------- Forwarded message --------- From: HAMSHACK <subscribe@...>Date: Tue, Dec 31, 2024 at 10:56?AM Subject: Cinch Jones 12 pin NEW old surplus (NOS) radio gear connectors as pictured 4 avail - Just Listed To: < ve7ps@...>
CQ CQ: , A new listing: Cinch Jones 12 pin NEW old surplus (NOS) radio gear connectors as pictured 4 avail has been published on Hamshack.ca. Click on this link to review the listing .
New listing details: Cinch Jones 12 pin NEW old surplus (NOS) radio gear connectors as pictured 4 avail- i can deliver to Blind River or Sudbury or down in the Ottawa valley in May when I head down there. Basically new old surplus unused from an old timer who was downsizing out his ¡
Thanks for using Hamshack and be sure to tell your fellow hams about ? Best 73 ¨C VE7DXE Don ? PS: You received this email notification because you provided your email address: ve7ps@... in order to receive notifications when new item is listed on
Unsubscribe 
|
Those voltages will inly read correctly if the PLL loop is closed. Do you have enough extenders to put the radio into operating condition?
The way you have it operating, the output at the test point is simply ramping up to the maximum that can be produced by U504 in an open loop condition.
However, the high band VCO should also go high in frequency with ~21 volts on RFC505.
I assume that, if you short RFC502 (lo band VCO) to ground, the frequency you read drops from the 65 MHz quite a lot.
Gary
W0DVN?
toggle quoted message
Show quoted text
On Dec 31, 2024, at 11:54?AM, Jim Harris via groups.io <radiove1rb@...> wrote:
Hi Gary, I did the ground on RFC505 and no change except that the
voltage goes very low of course going through a 100K resistor. The
frequency counter shows 1.3 MHz on the output of the VCO when it
is on 10 or 15 meters. When I switch to 14 MHz it pops up to 65
MHz but it is not connect to the translator board just plugged
into my extenders.? I did a voltage check at the test point off of
CR515, CR516, CR517, and CR518 and here is what I got, Way off. 1.5 MHZ 21.24 VDC Looks like it should be 3 volts. the photocopy
is heard to read. 14.0 MHz 21.20 VDC Looks like it should be maybe 15 volts 21.0 MHZ 21.17 VDC and looks like it should be 6 Volts 29.5 MHZ 21.15 VDC and looks like it should be 14.5 volts Maybe I am way off Gary but hope that maybe that helps. Almost
looks like something it shorted? I don't know where to go next so
any help appreciated. Thanks.
73, Jim VE1RB
On 2024-12-30 13:42, Gary Follett via
groups.io wrote:
That is WAY too high!!
The maximum that should be seen at this point is ~15 volts,
the high end of 10 meters. 20 volts here would push the VCO to
its maximum frequency, if it is running at all.?
Is there any RF signal coming out of the VCO? You may have
answered this previously but I seem to have forgotten the
answer. If there IS RF, here, what is its frequency?
Something is telling the PLL phase detector to put out a
voltage thinking that the frequency is too low, which is why the
voltage on RFC505 is so high.
Can you short RFC505 cold end to ground? This SHOULD make the
VCO, if it is operating, go to the low end of its range in
frequency. This point is fed via a 100K resistor from U504B so
this will not hurt anything.
Gary
W0DVN
PS: Not taking into account C516 and C517, I had previously
stated that voltage across the tuning diodes depended one the
voltage at Q504 Drain. This was an error on my part. Those two
capacitors isolate the DC on the tuning diodes from the Drain of
the oscillator FET.
Cn you short?
Gary
I just checked that voltage again with the band switch
on 10 meters and the DC voltage at that RFC505 is 20.52
DC. Hope that helps.
Jim VE1RB
On Sun, Dec 29, 2024
at 8:37?PM Gary Follett via ??<xntrick1948= [email protected]>
wrote:
What is the voltage on RFC 505?
Gary
W0DVN
Worked
on the VCO board today and founds that the
5 volt regulator is working just fine 5.02
VDC. So am thinking about it trying to
decide what I check next. Might make a
chart of voltages on the transistors from
the working one and compare to the non
working section.
73, Jim Ve1RB
On Sat,
Dec 28, 2024 at 11:08?PM Gary Follett
via ??<xntrick1948= [email protected]>
wrote:
The power supply that is the
subject of this issue is the 7805
regulator on the VCO board. That is
the one that denies power to just the
one VCO (high bands, in this case)
when it fails.
Regards,
Gary
W0DVN
On Dec 28, 2024, at
8:28?PM, Tony N5DIM < tony@...> wrote:
The WB4HFN
website has a section with
great information related to
that power supply board. I
just used it to resurrect a
TR7 that was DOA. Good luck.
73 Tony N5DIM?
On
Dec 28, 2024, at
5:52?PM, Gary Follett
via??<xntrick1948=[email protected]> wrote:
?Sounds
like you are on the
right track. Don¡¯t
ocelot the electrolytic
capacitors on that
supply as well.
Gary
W0DVN
Gary,
I found a few
minutes to
work on the
TR7 and
discovered
that the high
VCO is not
working at
all. It does
have the 10
vdc supply
switch?on it
but I don't
know if that
reulagor?is
working or
not. I will
check it out
but have to
work on
getting the
metal shield
off. I Hope
that is the
problem but I
will work on
it maybe
tomorrow.
Thanks for all
your help.
73, Jim
VE1RB
On Fri, Dec 27, 2024 at 9:06?PM Gary Follett via ??<xntrick1948= [email protected]>
wrote:
It is
worth asking,
did the
failure of
your VCO board
(displaying
51.950) occur
on its own?
That is to
ask, did the
radio work
properly and
then just fail
or has it, as
long as you
have had it,
always
operated with
this fault??
If it
once worked
for you and
then failed,
then it would
make sense to
see what gets
disconnected
if those pins
are not in
line ?and look
for a way that
same thing
could happen
without the
pin alignment
problem.
The pin
alignment fix
is pretty easy
though, if the
board
alignment is
the cause. It
just SOUNDS
difficult.
That
whole DR7 was
always a
source of
issues due to
its complexity
and difficulty
of
installation.
I don¡¯t know
how a DR7
could even
endure the
stresses of
removal and
reinsertion
more than
once!
Gary?
W0DVN
Thanks
Tom. I printed
that off but
hope that is
not the
problem.
73, Jim
VE1RB
In 2010
there was a
thread
regarding the
Drake TR-7
display
showing
51950.0 on the
old retired
Drakelist.
The
thread is
archived at?
Please
click the link
so the owner
knows that we
find the
archive
useful.
Hope this
helps.
Tom, AG9X
================?
Below are
the posts from
Brian Koontz
WA3ITE, Jim
Shorney NU0C
and Garey
Barrell K4OAH
(SK)?
(just in
case Drake
TR-7 DR-7
problems
outlive the??site)
Re:
[Drakelist]
Almost there:
TR-7 display
issues --
FIXED!
Brian Koontz
Fri, 30 Jul
2010 20:36:54
-0700
Well, the TR-7
from hell is
now a fully
operational
TR-7 from
hell!
In preparation
for some
signal
tracing, I
decided to
extend the
DR-7
board using
the extenders
I have.? To do
this, you have
to unmount the
two voltage
regulators
mounted to the
chassis, and
jumper the
connector
farthest to
the right. ?(I
didn't bother
connecting the
up/down band
buttons.) ?Lo
and behold,
the display
worked!?
Some further
investigation
revealed that
the chassis
has warped
over
the years, so
the two
3-prong
connectors on
the VCO board
were no
longer in a
horizontal
line.? So I
was determined
to make sure
the
board was
fully seated
on all the
connectors.
To do this, I
had to drop
the front
panel.? Not a
major chore,
just
one knob to
remove (the
band knob) and
6 side screws.
With that now
out of the
way, it was an
easy job to
determine if
all the pins
were
where they
belonged.? The
only snag was
that the front
panel, when
canted
downwards,
angles the PTO
can upwards.?
So you have to
hold the
front panel
perpendicular
and steady
with slight
downward
pressure to
fully seat the
board.? Once
all the pins
were visually
confirmed to
be
seated, I
remounted the
front panel,
reattached the
regulators and
all
the
connectors,
and fired the
rig up.?
Everything now
seems to work!
It turns out
the original
DR-7 board was
indeed
defective as
well
(possibly
because it had
been seated
incorrectly).?
And a visual
confirmation
from topside
indicates the
chassis is,
indeed,
warped:
The screw hole
is misaligned
with the
mounting hole
in the board.?
So, for
archival
purposes in
case anyone
else decides
to search for
this problem:
?If the
display if
fixed on
"51950", one
possible cause
is that one or
more DR-7
pins, possibly
the VCO pins,
are not
correctly
seated.? The
best solution
is to drop the
front panel
and
confirm
visually that
the pins are
fully seated.
Now it's time
to get on the
air!
??--Brian/WA3ITE
=================?
Jim
Shorney Fri,
30 Jul 2010
23:17:58 -0700
On Fri, 30 Jul
2010 20:40:52
-0500, Brian
Koontz wrote:
>Well, the
TR-7 from hell
is now a fully
operational
TR-7 from
hell!
>
>Now it's
time to get on
the air!
Congratulations, Brian! You have been assimilated into the collective.
Resistance is
futile.
73
-Jim
=================
?
Garey
Barrell ?k4oah@...?via ?
Sat, Jul 31,
2010, 8:34?AM
to drakelist
Brian Koontz
wrote:
> Some
further
investigation
revealed that
the chassis
has warped
over
> the
years, so the
two 3-prong
connectors on
the VCO board
were no
> longer in
a horizontal
line.? So I
was determined
to make sure
the
> board was
fully seated
on all the
connectors.
>
>
>
> So, for
archival
purposes in
case anyone
else decides
to search for
> this
problem: ?If
the display is
fixed on
"51950", one
possible cause
> is that
one or more
DR-7 pins,
possibly the
VCO pins, are
not
> correctly
seated.? The
best solution
is to drop the
front panel
and
> confirm
visually that
the pins are
fully seated.
>
Brian -
Congratulations!! ? It's always nice when one 'comes together'.
Just as an
aside, someone
suggested
earlier (and
correctly)
that the
"51950"
problem may
indicate a
loss of the
500 kHz
reference
signal.?
You might find
it interesting
that the
left-most
three pin
connector on
the VCO board
is the 500 kHz
reference
signal!
Those pins on
the bottom of
the DR-7 are
ALWAYS a
problem, ya'
just
can't see
'em!!
Your 'trials'
have been an
interesting
'trip' for
others, thanks
for
documenting it
for us all.
73, Garey -
K4OAH
Glen Allen, VA
Drake 2-B,
4-B,
C-Line&
?TR-4/C
Service
Supplement CDs
<>
=================
?
Search
terms to make
this post
easier to
find:? Drake
TR-7 TR7 DR-7
DR7 display
frozen locked
stuck ?
51950??
51,950?? 51
950?? 5195?
51950.0 ?
51,950.0 ? 51
950 0
???
|
Re: VE3EFJ third mixer mod for the R4C
Hi Rob;
?
You wrote, "My MIX-4 has a J309 FET properly coupled to the 5695 kHz IF tuned circuit, and separate ports on the NE602 Gilbert Cell mixer for the IF and the LO injections"
?
Have you given anyone permission to reproduce the PCB's for your R-4C mods? I would love to install all of them in my 4C. The parts can be sourced but PCB's would be needed.
?
Thanks
?
?
Glenn W2BX
?
|
Hi Gary, I did the ground on RFC505 and no change except that the
voltage goes very low of course going through a 100K resistor. The
frequency counter shows 1.3 MHz on the output of the VCO when it
is on 10 or 15 meters. When I switch to 14 MHz it pops up to 65
MHz but it is not connect to the translator board just plugged
into my extenders.? I did a voltage check at the test point off of
CR515, CR516, CR517, and CR518 and here is what I got, Way off.
1.5 MHZ 21.24 VDC Looks like it should be 3 volts. the photocopy
is heard to read.
14.0 MHz 21.20 VDC Looks like it should be maybe 15 volts
21.0 MHZ 21.17 VDC and looks like it should be 6 Volts
29.5 MHZ 21.15 VDC and looks like it should be 14.5 volts
Maybe I am way off Gary but hope that maybe that helps. Almost
looks like something it shorted? I don't know where to go next so
any help appreciated. Thanks.
73, Jim VE1RB
On 2024-12-30 13:42, Gary Follett via
groups.io wrote:
toggle quoted message
Show quoted text
That is WAY too high!!
The maximum that should be seen at this point is ~15 volts,
the high end of 10 meters. 20 volts here would push the VCO to
its maximum frequency, if it is running at all.?
Is there any RF signal coming out of the VCO? You may have
answered this previously but I seem to have forgotten the
answer. If there IS RF, here, what is its frequency?
Something is telling the PLL phase detector to put out a
voltage thinking that the frequency is too low, which is why the
voltage on RFC505 is so high.
Can you short RFC505 cold end to ground? This SHOULD make the
VCO, if it is operating, go to the low end of its range in
frequency. This point is fed via a 100K resistor from U504B so
this will not hurt anything.
Gary
W0DVN
PS: Not taking into account C516 and C517, I had previously
stated that voltage across the tuning diodes depended one the
voltage at Q504 Drain. This was an error on my part. Those two
capacitors isolate the DC on the tuning diodes from the Drain of
the oscillator FET.
Cn you short?
Gary
I just checked that voltage again with the band switch
on 10 meters and the DC voltage at that RFC505 is 20.52
DC. Hope that helps.
Jim VE1RB
On Sun, Dec 29, 2024
at 8:37?PM Gary Follett via ??<xntrick1948= [email protected]>
wrote:
What is the voltage on RFC 505?
Gary
W0DVN
Worked
on the VCO board today and founds that the
5 volt regulator is working just fine 5.02
VDC. So am thinking about it trying to
decide what I check next. Might make a
chart of voltages on the transistors from
the working one and compare to the non
working section.
73, Jim Ve1RB
On Sat,
Dec 28, 2024 at 11:08?PM Gary Follett
via ??<xntrick1948= [email protected]>
wrote:
The power supply that is the
subject of this issue is the 7805
regulator on the VCO board. That is
the one that denies power to just the
one VCO (high bands, in this case)
when it fails.
Regards,
Gary
W0DVN
On Dec 28, 2024, at
8:28?PM, Tony N5DIM < tony@...> wrote:
The WB4HFN
website has a section with
great information related to
that power supply board. I
just used it to resurrect a
TR7 that was DOA. Good luck.
73 Tony N5DIM?
On
Dec 28, 2024, at
5:52?PM, Gary Follett
via??<xntrick1948=[email protected]> wrote:
?Sounds
like you are on the
right track. Don¡¯t
ocelot the electrolytic
capacitors on that
supply as well.
Gary
W0DVN
Gary,
I found a few
minutes to
work on the
TR7 and
discovered
that the high
VCO is not
working at
all. It does
have the 10
vdc supply
switch?on it
but I don't
know if that
reulagor?is
working or
not. I will
check it out
but have to
work on
getting the
metal shield
off. I Hope
that is the
problem but I
will work on
it maybe
tomorrow.
Thanks for all
your help.
73, Jim
VE1RB
On Fri, Dec 27, 2024 at 9:06?PM Gary Follett via ??<xntrick1948= [email protected]>
wrote:
It is
worth asking,
did the
failure of
your VCO board
(displaying
51.950) occur
on its own?
That is to
ask, did the
radio work
properly and
then just fail
or has it, as
long as you
have had it,
always
operated with
this fault??
If it
once worked
for you and
then failed,
then it would
make sense to
see what gets
disconnected
if those pins
are not in
line ?and look
for a way that
same thing
could happen
without the
pin alignment
problem.
The pin
alignment fix
is pretty easy
though, if the
board
alignment is
the cause. It
just SOUNDS
difficult.
That
whole DR7 was
always a
source of
issues due to
its complexity
and difficulty
of
installation.
I don¡¯t know
how a DR7
could even
endure the
stresses of
removal and
reinsertion
more than
once!
Gary?
W0DVN
Thanks
Tom. I printed
that off but
hope that is
not the
problem.
73, Jim
VE1RB
In 2010
there was a
thread
regarding the
Drake TR-7
display
showing
51950.0 on the
old retired
Drakelist.
The
thread is
archived at?
Please
click the link
so the owner
knows that we
find the
archive
useful.
Hope this
helps.
Tom, AG9X
================?
Below are
the posts from
Brian Koontz
WA3ITE, Jim
Shorney NU0C
and Garey
Barrell K4OAH
(SK)?
(just in
case Drake
TR-7 DR-7
problems
outlive the??site)
Re:
[Drakelist]
Almost there:
TR-7 display
issues --
FIXED!
Brian Koontz
Fri, 30 Jul
2010 20:36:54
-0700
Well, the TR-7
from hell is
now a fully
operational
TR-7 from
hell!
In preparation
for some
signal
tracing, I
decided to
extend the
DR-7
board using
the extenders
I have.? To do
this, you have
to unmount the
two voltage
regulators
mounted to the
chassis, and
jumper the
connector
farthest to
the right. ?(I
didn't bother
connecting the
up/down band
buttons.) ?Lo
and behold,
the display
worked!?
Some further
investigation
revealed that
the chassis
has warped
over
the years, so
the two
3-prong
connectors on
the VCO board
were no
longer in a
horizontal
line.? So I
was determined
to make sure
the
board was
fully seated
on all the
connectors.
To do this, I
had to drop
the front
panel.? Not a
major chore,
just
one knob to
remove (the
band knob) and
6 side screws.
With that now
out of the
way, it was an
easy job to
determine if
all the pins
were
where they
belonged.? The
only snag was
that the front
panel, when
canted
downwards,
angles the PTO
can upwards.?
So you have to
hold the
front panel
perpendicular
and steady
with slight
downward
pressure to
fully seat the
board.? Once
all the pins
were visually
confirmed to
be
seated, I
remounted the
front panel,
reattached the
regulators and
all
the
connectors,
and fired the
rig up.?
Everything now
seems to work!
It turns out
the original
DR-7 board was
indeed
defective as
well
(possibly
because it had
been seated
incorrectly).?
And a visual
confirmation
from topside
indicates the
chassis is,
indeed,
warped:
The screw hole
is misaligned
with the
mounting hole
in the board.?
So, for
archival
purposes in
case anyone
else decides
to search for
this problem:
?If the
display if
fixed on
"51950", one
possible cause
is that one or
more DR-7
pins, possibly
the VCO pins,
are not
correctly
seated.? The
best solution
is to drop the
front panel
and
confirm
visually that
the pins are
fully seated.
Now it's time
to get on the
air!
??--Brian/WA3ITE
=================?
Jim
Shorney Fri,
30 Jul 2010
23:17:58 -0700
On Fri, 30 Jul
2010 20:40:52
-0500, Brian
Koontz wrote:
>Well, the
TR-7 from hell
is now a fully
operational
TR-7 from
hell!
>
>Now it's
time to get on
the air!
Congratulations, Brian! You have been assimilated into the collective.
Resistance is
futile.
73
-Jim
=================
?
Garey
Barrell ?k4oah@...?via ?
Sat, Jul 31,
2010, 8:34?AM
to drakelist
Brian Koontz
wrote:
> Some
further
investigation
revealed that
the chassis
has warped
over
> the
years, so the
two 3-prong
connectors on
the VCO board
were no
> longer in
a horizontal
line.? So I
was determined
to make sure
the
> board was
fully seated
on all the
connectors.
>
>
>
> So, for
archival
purposes in
case anyone
else decides
to search for
> this
problem: ?If
the display is
fixed on
"51950", one
possible cause
> is that
one or more
DR-7 pins,
possibly the
VCO pins, are
not
> correctly
seated.? The
best solution
is to drop the
front panel
and
> confirm
visually that
the pins are
fully seated.
>
Brian -
Congratulations!! ? It's always nice when one 'comes together'.
Just as an
aside, someone
suggested
earlier (and
correctly)
that the
"51950"
problem may
indicate a
loss of the
500 kHz
reference
signal.?
You might find
it interesting
that the
left-most
three pin
connector on
the VCO board
is the 500 kHz
reference
signal!
Those pins on
the bottom of
the DR-7 are
ALWAYS a
problem, ya'
just
can't see
'em!!
Your 'trials'
have been an
interesting
'trip' for
others, thanks
for
documenting it
for us all.
73, Garey -
K4OAH
Glen Allen, VA
Drake 2-B,
4-B,
C-Line&
?TR-4/C
Service
Supplement CDs
<>
=================
?
Search
terms to make
this post
easier to
find:? Drake
TR-7 TR7 DR-7
DR7 display
frozen locked
stuck ?
51950??
51,950?? 51
950?? 5195?
51950.0 ?
51,950.0 ? 51
950 0
???
|
Re: TR-5 BPF AMP Board Oddness
Thanks Stan. So yours is 69 units newer than mine, and has the
standard board. I wonder how I ended up with this one? Hopefully
a few more data points will come in and help settle this (whether
it's a one-off).
The radio I got from Steve came with a box loaded with replacement
boards. It included a replacement for nearly every board in the TR-5.
But not that one :-P
If there had been a replacement, I could have swapped boards, and
then traced out the oddball. Alas ...
But there are more pressing matters at hand. Namely, figuring out
why the tx logic is being illogical. Switching to Key Lock does
nada, which is hopeful. It points the finger at the source of the
TX voltage rail being absent. Hopefully an easy one to track down.
--lyndon
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One of my rules is to never leave vintage gear running unattended, even for "just a minute". On Mon, 30 Dec 2024 21:42:45 -0500 "Jay W6CJ via groups.io" <lastradioman@...> wrote: note to self: if leaving the room, turn
stuff off -- 73 -Jim NU0C
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Re: L4B replacement potentiometer
Stan,
You have some great ideas!
Happy New Year,
Evan, K9SQG
Hi Evan,
Happy New Year to you and everyone on the group!
Maybe my old post to the group will be useful
/g/DRAKE-RADIO/message/33242?? Both parts are still
available.
73
Stan
KM4HQE
On 12/30/24 13:27, Evan via groups.io
wrote:
Fellow Drake
Enthusiasts,
Happy New Year to
all!!!
A while
back somebody had mentioned that Mouser part number?313-1601F-100K
was a
direct replacement for the L4B pot, right resistance,
with a push pull switch. ?However, that particular pot
does not have a shaft that is long enough for the L4B.
?Might I have the part number wrong?
I already have some
pots that are direct replacements after I machine the
mounting collar to the right length. ?However, if there
are direct replacements it would save me some time.
Can you help?
73,
Evan, K9SQG
|
Re: L4B replacement potentiometer
Hi Evan,
Happy New Year to you and everyone on the group!
Maybe my old post to the group will be useful
/g/DRAKE-RADIO/message/33242?? Both parts are still
available.
73
Stan
KM4HQE
On 12/30/24 13:27, Evan via groups.io
wrote:
toggle quoted message
Show quoted text
Fellow Drake
Enthusiasts,
Happy New Year to
all!!!
A while
back somebody had mentioned that Mouser part number?313-1601F-100K
was a
direct replacement for the L4B pot, right resistance,
with a push pull switch. ?However, that particular pot
does not have a shaft that is long enough for the L4B.
?Might I have the part number wrong?
I already have some
pots that are direct replacements after I machine the
mounting collar to the right length. ?However, if there
are direct replacements it would save me some time.
Can you help?
73,
Evan, K9SQG
|
Sorry if my keying logic was inverted.?? The open key would sometimes close long enough to produce a dit or dah, or long enough to slag my T4XC finals (note to self: if leaving the room, turn stuff off). Didn't notice all this until I plugged the key into a HW-16. The key was a Nye-Viking Master key, with the contacts enclosed inside the base. I may replace it with a Vibroplex bug or Bencher straight key.? Anyone tried the Vibroplex straight key? 73 Jay
? ? You are probably right but I was puzzled.
? ? Both Lionel and ARH keys are good keys, easy to clean. J-38 keys
were made by several manufacturers but these two, and Radio Specialties,
which is evidently the same as ARH, are the most common.
On 12/30/2024 3:18 PM, Steve Wedge, W1ES/4 via wrote:
> Low resistance when the contacts are open, is what I¡¯m assuming what is
> being described.
>
> I have a T-4 that went stuck in transmit but I lucked out ¡ª it wasn¡¯t
> putting out full power.? I¡¯m going to check my J-38 this evening.? It¡¯s
> conceivable for this to have picked up some schmutz over 80 years¡
>
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
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Rob Sherwood
Jim Shorney
Jay W6CJ