Yes, that's how I interpreted the numbering.
I soldered in a 1k resistor from the switch lug to the "ground" etch.? The receiver is working great.? I'll do an alignment on it next week and revisit why it makes the BFO function again.? It's weird.
73 & thanks,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Friday, June 24th, 2022 at 4:25 PM, wb6ogd <garywinblad@...> wrote:
On Fri, Jun 24, 2022 at 12:29 PM, Steve Wedge, W1ES/4 wrote:
If I am interpreting the dating of the schematics correctly, Garey's is later. (mine is 919664054 and the CD is 1026665400 and my C168 agrees with the CD.
I think you are interpreting it correctly.? This is what I think it means:
919664054 means 9/19/1966 at serial number 4054
1026665400 means 10/26/1966 at serial number 5400
So Drake discovered the error in the BFO schematic in about a month.
73,
Gary
WB6OGD
|
Hi Guys, thanks for the welcome. I¡¯ll send another message when Ron Baker finishes the work. I only wish I picked the radio up in the winter as it get my upstairs shack even hotter during these hot summer nights! Thanks again.
Rich
Kq9l
|
I have a family function tomorrow, then travelling to Asheville Sunday and so will likely not be doing any FD this year.? My club decided to not do an in-person FD this year so I'm not going to lose sleep, though I usually have kept things away from FD weekend.
I did run my TR7 and B Line last year, running 1E.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Friday, June 24th, 2022 at 5:48 PM, Steve Bookout, NR4M <steve@...> wrote:
If properly used, it will
secure a 48 foot sailboat, in category II winds.
A DX-100 is only good for a
small Boston Whaler in a mild breeze.
Seriously, I think it weighs
660 pounds. I re-assembled the three drawers into the
housing, using a automotive engine hoist.
73 de Steve, NR4M
Will be doing FD as NR4M in
class D, work us all bands. We be using one of my C-lines;
all CW.
On 6/24/2022 4:36 PM, Richard Knoppow wrote:
This was the successor to the Hallicrafters BC-610. The TMC
GPT-750 is really the sucessor to this, at least the AM version.
The RCA AR-88, CRM R6A, Racal M-17, MacKay 3010C all weigh in
at 100 lbs, the drake is a featherweight.
On 6/24/2022 11:32 AM, Steve Wedge, W1ES/4 via groups.io wrote:
Now THAT is a boat anchor!
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with Proton Mail secure email.
------- Original Message -------
On Friday, June 24th, 2022 at 12:52 PM, Steve Bookout, NR4M
<steve@...> wrote:
Like this one, John?image0.jpeg
73 de Steve, NR4M
On Jun 24, 2022, at 10:46 AM, John
<johnk5mo@...> wrote:
?
These are just canoe anchors. A DX100 or a T368 is indeed
a boat anchor! :-)
Enjoy your Drake!
73
John K5MO
On Fri, Jun 24, 2022 at 10:44 AM Joseph Nicholas Graif -
K4JNG <jgraif1@...
<mailto:jgraif1@...>> wrote:
hello, rich and welcome! be careful with that word ¡°boat
anchor¡±. these are our children of whom you speak!____
__
image002.png
____ __
__ __
__ __
__ __
__ __
__ __
my cw is rusty but i have always loved it. contact me
directly and we can try setting up a sked.____
__ __
best regards,____
joe____
__ __
joseph n. graif____
k4jng____
__ __
*From:* [email protected]
<mailto:[email protected]>
<[email protected]
<mailto:[email protected]>> *On Behalf Of
*richlim11
via groups.io
*Sent:* Friday, June 24, 2022 9:12 AM
*To:* [email protected]
<mailto:[email protected]>
*Subject:* [DRAKE-RADIO] Good Day All____
__ __
Good Day all, I'm new here and just wanted to say Hi!
I have always wanted an old boat anchor radio since
getting first licensed about 20yrs ago. I found an old
Drake TR4C at an acceptable price on ebay and purchased
it
and have made a few contacts CW with the rig. The radio
is very nice and all that I had expected it to be. She
is
going off for a "full service" tune up and having a new
faceplate put on since the prior owner drilled a hole it
it. When it's back, I hope to work some of you Drake to
Drake CW. Do you guys have a favored calling frequency
on 40?
Thanks again.
Rich
KQ9L ____
__
|
If properly used, it will
secure a 48 foot sailboat, in category II winds.
A DX-100 is only good for a
small Boston Whaler in a mild breeze.
Seriously, I think it weighs
660 pounds.? I re-assembled the three drawers into the
housing, using a automotive engine hoist.
73 de Steve, NR4M
Will be doing FD as NR4M in
class D, work us all bands.? We be using one of my C-lines;
all CW.
toggle quoted message
Show quoted text
On 6/24/2022 4:36 PM, Richard Knoppow wrote:
??
This was the successor to the Hallicrafters BC-610. The TMC
GPT-750 is really the sucessor to this, at least the AM version.
?? The RCA AR-88, CRM R6A, Racal M-17, MacKay 3010C all weigh in
at 100 lbs, the drake is a featherweight.
On 6/24/2022 11:32 AM, Steve Wedge, W1ES/4 via groups.io wrote:
Now THAT is a boat anchor!
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with Proton Mail secure email.?
------- Original Message -------
On Friday, June 24th, 2022 at 12:52 PM, Steve Bookout, NR4M
<steve@...> wrote:
Like this one, John?image0.jpeg
73 de Steve, NR4M
On Jun 24, 2022, at 10:46 AM, John
<johnk5mo@...> wrote:
?
These are just? canoe anchors.?? A DX100 or a T368 is indeed
a boat anchor!? :-)
Enjoy your Drake!
73
John K5MO
On Fri, Jun 24, 2022 at 10:44 AM Joseph Nicholas Graif -
K4JNG <jgraif1@...
<mailto:jgraif1@...>> wrote:
??? hello, rich and welcome! be careful with that word ¡°boat
??? anchor¡±. these are our children of whom you speak!____
??? __
??????? image002.png
??? ____ __
??? __ __
??? __ __
??? __ __
??? __ __
??? __ __
??? my cw is rusty but i have always loved it. contact me
??? directly and we can try setting up a sked.____
??? __ __
??? best regards,____
??? joe____
??? __ __
??? joseph n. graif____
??? k4jng____
??? __ __
??? *From:* [email protected]
??? <mailto:[email protected]>
<[email protected]
??? <mailto:[email protected]>> *On Behalf Of
*richlim11
??? via groups.io
??? *Sent:* Friday, June 24, 2022 9:12 AM
??? *To:* [email protected]
<mailto:[email protected]>
??? *Subject:* [DRAKE-RADIO] Good Day All____
??? __ __
??? Good Day all, I'm new here and just wanted to say Hi!
??? I have always wanted an old boat anchor radio since
??? getting first licensed about 20yrs ago. I found an old
??? Drake TR4C at an acceptable price on ebay and purchased
it
??? and have made a few contacts? CW with the rig. The radio
??? is very nice and all that I had expected it to be. She
is
??? going off for a "full service" tune up and having a new
??? faceplate put on since the prior owner drilled a hole it
??? it.? When it's back, I hope to work some of you Drake to
??? Drake CW. Do you guys have a favored calling frequency
on 40?
??? Thanks again.
??? Rich
??? KQ9L ____
??? __
|
Seems to me there is a free ware drawing program for Windows that does the same thing. I may have it on this machine, will look.
toggle quoted message
Show quoted text
On 6/24/2022 1:48 PM, Gary Follett wrote: I put schematics into Photoshop and stitch them together into one large readable page. I then use the ¡°Select Rectangle¡± tool to follow a given line in the schematic and highlight various lines in different colors. However, the schematic needs to be straight for this to work and there is no simple way to do diagonal traces.
Once I have a circuit fully mapped out, I upload it to my iPad and take that to the bench for circuit tracing.
This works REALLY well because I have the full circuit, zoomable at very high resolution, with the offending circuit fully traced out in color!
If I had Visio on the MAC I would use that instead because that is a drawing program, not a photo editing program so you can follow any angle and highlight any trace in any color. You simply import the stitched schematic into Visio as an image and you are good to go. You can just draw right over the image.
Gary
W0DVN
On Jun 24, 2022, at 3:40 PM, Richard Knoppow <1oldlens1@...> wrote:
I have the same problem with the way rotary switches are presented on Drake schematics. If possible have a large size print made of the schematic and use colored pencils or a hi-liter to trace through the connections. I use the same technique on other schematics that look like maps of a freight yard.
On 6/24/2022 1:04 PM, wb6ogd wrote:
Steve,
Sorry, I was looking at my R-4B schematic.
Disclaimer.. I am somewhat "Drake rotary switch" challenged...
The way I think it works is...
Power for the BFO or the AM detector comes from R130.
When the BFO should be on, this power is switched to T11/C163.
When in AM, power from R130 gets switched to R116.
So, I would check for voltage at T11 with the switch rotated.
C188 seems to be added to the same BFO circuit in the R-4B.
It decouples the exact node you propose to put a 1K to ground!!
Might be something Drake discovered in later models??
Also, schematic 919664054 seems to have a big error in the BFO, my downloaded from somewhere
copy has the correction marked in, that makes it like the R-4B schematic (the emitter connects to C163).
73,
Gary
WB6OGD --
Richard Knoppow
1oldlens1@...
WB6KBL
--
Richard Knoppow
1oldlens1@...
WB6KBL
|
I put schematics into Photoshop and stitch them together into one large readable page. I then use the ¡°Select Rectangle¡± tool to follow a given line in the schematic and highlight various lines in different colors. However, the schematic needs to be straight for this to work and there is no simple way to do diagonal traces.
Once I have a circuit fully mapped out, I upload it to my iPad and take that to the bench for circuit tracing.
This works REALLY well because I have the full circuit, zoomable at very high resolution, with the offending circuit fully traced out in color!
If I had Visio on the MAC I would use that instead because that is a drawing program, not a photo editing program so you can follow any angle and highlight any trace in any color. You simply import the stitched schematic into Visio as an image and you are good to go. You can just draw right over the image.
Gary
W0DVN
toggle quoted message
Show quoted text
On Jun 24, 2022, at 3:40 PM, Richard Knoppow <1oldlens1@...> wrote:
I have the same problem with the way rotary switches are presented on Drake schematics. If possible have a large size print made of the schematic and use colored pencils or a hi-liter to trace through the connections. I use the same technique on other schematics that look like maps of a freight yard.
On 6/24/2022 1:04 PM, wb6ogd wrote:
Steve,
Sorry, I was looking at my R-4B schematic.
Disclaimer.. I am somewhat "Drake rotary switch" challenged...
The way I think it works is...
Power for the BFO or the AM detector comes from R130.
When the BFO should be on, this power is switched to T11/C163.
When in AM, power from R130 gets switched to R116.
So, I would check for voltage at T11 with the switch rotated.
C188 seems to be added to the same BFO circuit in the R-4B.
It decouples the exact node you propose to put a 1K to ground!!
Might be something Drake discovered in later models??
Also, schematic 919664054 seems to have a big error in the BFO, my downloaded from somewhere
copy has the correction marked in, that makes it like the R-4B schematic (the emitter connects to C163).
73,
Gary
WB6OGD --
Richard Knoppow
1oldlens1@...
WB6KBL
|
I have the same problem with the way rotary switches are presented on Drake schematics. If possible have a large size print made of the schematic and use colored pencils or a hi-liter to trace through the connections. I use the same technique on other schematics that look like maps of a freight yard.
toggle quoted message
Show quoted text
On 6/24/2022 1:04 PM, wb6ogd wrote: Steve,
Sorry, I was looking at my R-4B schematic.
Disclaimer.. I am somewhat "Drake rotary switch" challenged...
The way I think it works is...
Power for the BFO or the AM detector comes from R130.
When the BFO should be on, this power is switched to T11/C163.
When in AM, power from R130 gets switched to R116.
So, I would check for voltage at T11 with the switch rotated.
C188 seems to be added to the same BFO circuit in the R-4B.
It decouples the exact node you propose to put a 1K to ground!!
Might be something Drake discovered in later models??
Also, schematic 919664054 seems to have a big error in the BFO, my downloaded from somewhere
copy has the correction marked in, that makes it like the R-4B schematic (the emitter connects to C163).
73,
Gary
WB6OGD
--
Richard Knoppow
1oldlens1@...
WB6KBL
|
This was the successor to the Hallicrafters BC-610. The TMC GPT-750 is really the sucessor to this, at least the AM version.
The RCA AR-88, CRM R6A, Racal M-17, MacKay 3010C all weigh in at 100 lbs, the drake is a featherweight.
toggle quoted message
Show quoted text
On 6/24/2022 11:32 AM, Steve Wedge, W1ES/4 via groups.io wrote: Now THAT is a boat anchor!
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with Proton Mail <> secure email.
------- Original Message -------
On Friday, June 24th, 2022 at 12:52 PM, Steve Bookout, NR4M <steve@...> wrote:
Like this one, John?image0.jpeg
73 de Steve, NR4M
On Jun 24, 2022, at 10:46 AM, John <johnk5mo@...> wrote:
?
These are just? canoe anchors.?? A DX100 or a T368 is indeed a boat anchor!? :-)
Enjoy your Drake!
73
John K5MO
On Fri, Jun 24, 2022 at 10:44 AM Joseph Nicholas Graif - K4JNG <jgraif1@... <mailto:jgraif1@...>> wrote:
hello, rich and welcome! be careful with that word ¡°boat
anchor¡±. these are our children of whom you speak!____
__
image002.png
____ __
__ __
__ __
__ __
__ __
__ __
my cw is rusty but i have always loved it. contact me
directly and we can try setting up a sked.____
__ __
best regards,____
joe____
__ __
joseph n. graif____
k4jng____
__ __
*From:* [email protected]
<mailto:[email protected]> <[email protected]
<mailto:[email protected]>> *On Behalf Of *richlim11
via groups.io <>
*Sent:* Friday, June 24, 2022 9:12 AM
*To:* [email protected] <mailto:[email protected]>
*Subject:* [DRAKE-RADIO] Good Day All____
__ __
Good Day all, I'm new here and just wanted to say Hi!
I have always wanted an old boat anchor radio since
getting first licensed about 20yrs ago. I found an old
Drake TR4C at an acceptable price on ebay and purchased it
and have made a few contacts? CW with the rig. The radio
is very nice and all that I had expected it to be. She is
going off for a "full service" tune up and having a new
faceplate put on since the prior owner drilled a hole it
it.? When it's back, I hope to work some of you Drake to
Drake CW. Do you guys have a favored calling frequency on 40?
Thanks again.
Rich
KQ9L ____
__
--
Richard Knoppow
1oldlens1@...
WB6KBL
|
I'm looking for a Drake AC4 Power Supply.
Working or not. Just as long as the transformer is good.
Price shipped to me, and your payment preference.
Thanks, 73, Jim W7RY
|
Re: TR7 volume knob / AF gain
FWIW, the effect is called "play through". It is common in some old receivers using self biased detectors. This is not the cause in the TR-7.
toggle quoted message
Show quoted text
On 6/24/2022 10:30 AM, Gary Follett wrote: That is very common in the TR7. The reason is that the pot does not go to zero ohms until the off position is reached. Later versions seemed to overcome this, likely by a change in the pot.
Gary
W0DVN
On Jun 24, 2022, at 11:51 AM, Mark Feltham via groups.io <> <dodacarem@... <mailto:dodacarem@...>> wrote:
Hello Guys,
When turning volume of my TR7 down full ccw I still have audio , in other words, the volume goes down but not to silent, has anyone else experienced this?
is it norm?
Mark
73
--
Richard Knoppow
1oldlens1@...
WB6KBL
|
On Fri, Jun 24, 2022 at 12:29 PM, Steve Wedge, W1ES/4 wrote:
If I am interpreting the dating of the schematics correctly, Garey's is later. (mine is 919664054 and the CD is 1026665400 and my C168 agrees with the CD.
I think you are interpreting it correctly.? This is what I think it means:
919664054 means 9/19/1966 at serial number 4054
1026665400 means 10/26/1966 at serial number 5400
So Drake discovered the error in the BFO schematic in about a month.
73,
Gary
WB6OGD
|
Steve,
Sorry, I was looking at my R-4B schematic.
Disclaimer.. I am somewhat "Drake rotary switch" challenged...
The way I think it works is...
Power for the BFO or the AM detector comes from R130.
When the BFO should be on, this power is switched to T11/C163.
When in AM, power from R130 gets switched to R116.
So, I would check for voltage at T11 with the switch rotated.
C188 seems to be added to the same BFO circuit in the R-4B.
It decouples the exact node you propose to put a 1K to ground!!
Might be something Drake discovered in later models??
Also, schematic 919664054 seems to have a big error in the BFO, my downloaded from somewhere
copy has the correction marked in, that makes it like the R-4B schematic (the emitter connects to C163).
73,
Gary
WB6OGD
|
Hello,
All of the sudden I have lost 10R . I have traced it to the mode switch.
However my copy of the mode switch wiring on my schematic is not very clear.
I even took the wafer off the switch bank. I still can not figure out . Of course
if jump +10 to 10R it will receive. But I am not going to try to xmit this way.
Any help would be appreciated.
TNX
Don WA4NIZ
|
Gary, this is an 11-tube (I'm guessing that C188 is in the 13-tuber). with a solid state BFO.? What I'm seeing in the schematic isn't exactly what is on the radio but the photo in Garey's service manual shows what I have (serial number 6393).? I don't see anything jumping out at me between my paper schematic and the one in Garey's CD, aside from a slight value change for C168.? If I am interpreting the dating of the schematics correctly, Garey's is later. (mine is 919664054 and the CD is 1026665400 and my C168 agrees with the CD.
Something very curious, though, has happened.? The whole voltage changed when I'd short the switch contacts -- presumably by virtue of being tied to ground via R116.? Of course, when I just short out the switch contacts, then AM mode won't work properly.? So I tried the obvious: I took a test lead and attached a 1k resistor to the far end and then touched the other end of the resistor to the chassis.? When I do this, everything works as intended!
I am tempted, at this point, to solder in a 1k resistor from the point where the junction of T11, C163 and R124 join, to the chassis but I'd sure like to be able to understand why.
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Friday, June 24th, 2022 at 3:01 PM, wb6ogd <garywinblad@...> wrote:
Steve,Could it just be a bad switch contact? Measure for voltage at T11 at C188. 73, Gary? WB6OGD? On Jun 24, 2022, at 11:28 AM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
? Welcome to my bench.? Today, we will look at demonic possession of a BFO.
Recap: BFO doesn't work with switch in any of the BFO positions.? Notice short note when switching from BFO modes to AM, right at make & break of rotary switch contacts? AM works normally.
Replaced Q6, subbed C166, C163, and even T11.? Removed both screws holding down the BFO board and they're clean on the underside.? Continuity to the chassis is good.? R124, 141 are good. Checked C168, 166 and 163 with cap meter and Sprague TO-6
The only way that I can get the BFO to come on and oscillate is by shorting the switch contact that feeds the AM detector's voltage divider to the other contacts.? When I do that, the set works normally with expected AGC behaviour in each position.? All points that should be at ground/chassis potential are where they should be.? The germanium diodes all measure around 0.230 V.? T11 adjusts the frequency and it's in the range (a scope probe pulls the frequency a couple of kHz).
C162 appears to be a base bypass.? Unfortunately for me I don't have another .05 ceramic cap at the moment but did try a .047 film cap, with no change. The switch has been cleaned.
What am I missing?? It's probably something dumb but I am just not seeing it!
TNX & 73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
|
Steve, Could it just be a bad switch contact? Measure for voltage at T11 at C188. 73, Gary? WB6OGD?
toggle quoted message
Show quoted text
On Jun 24, 2022, at 11:28 AM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
? Welcome to my bench.? Today, we will look at demonic possession of a BFO.
Recap: BFO doesn't work with switch in any of the BFO positions.? Notice short note when switching from BFO modes to AM, right at make & break of rotary switch contacts? AM works normally.
Replaced Q6, subbed C166, C163, and even T11.? Removed both screws holding down the BFO board and they're clean on the underside.? Continuity to the chassis is good.? R124, 141 are good. Checked C168, 166 and 163 with cap meter and Sprague TO-6
The only way that I can get the BFO to come on and oscillate is by shorting the switch contact that feeds the AM detector's voltage divider to the other contacts.? When I do that, the set works normally with expected AGC behaviour in each position.? All points that should be at ground/chassis potential are where they should be.? The germanium diodes all measure around 0.230 V.? T11 adjusts the frequency and it's in the range (a scope probe pulls the frequency a couple of kHz).
C162 appears to be a base bypass.? Unfortunately for me I don't have another .05 ceramic cap at the moment but did try a .047 film cap, with no change. The switch has been cleaned.
What am I missing?? It's probably something dumb but I am just not seeing it!
TNX & 73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
|
Welcome to the group, Rich!? When I'm just listening on 40 or any band, I usually have it parked 50 kHz above the bottom, in case I can use my straight key.
I've been preoccupied with my bench lately but I give each rig a turn at monitoring.? Today, it's the B Line's turn.? I currently have half an A Line, a B Line, C Line, TR-4Cw RIT and a TR7 for HF and a TR-6 for 6m.? I also have an Elecraft K3 with a P3 and a couple of Kenwood hybrids.
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Friday, June 24th, 2022 at 9:12 AM, richlim11 via groups.io <richlim11@...> wrote:
Good Day all, I'm new here and just wanted to say Hi!
I have always wanted an old boat anchor radio since getting first licensed about 20yrs ago. I found an old Drake TR4C at an acceptable price on ebay and purchased it and have made a few contacts? CW with the rig. The radio is very nice and all that I had expected it to be. She is going off for a "full service" tune up and having a new faceplate put on since the prior owner drilled a hole it it.? When it's back, I hope to work some of you Drake to Drake CW. Do you guys have a favored calling frequency on 40?
Thanks again.
Rich
KQ9L
|
Now THAT is a boat anchor!
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Friday, June 24th, 2022 at 12:52 PM, Steve Bookout, NR4M <steve@...> wrote:
Like this one, John?
73 de Steve, NR4M On Jun 24, 2022, at 10:46 AM, John <johnk5mo@...> wrote:
? These are just? canoe anchors.?? A DX100 or a T368 is indeed a boat anchor!? :-)
Enjoy your Drake!
73
John K5MO
On Fri, Jun 24, 2022 at 10:44 AM Joseph Nicholas Graif - K4JNG < jgraif1@...> wrote: hello, rich and welcome! be careful with that word ¡°boat anchor¡±. these are our children of whom you speak!
?? ? ? ? ? my cw is rusty but i have always loved it. contact me directly and we can try setting up a sked. ? best regards, joe ? joseph n. graif k4jng ? ? Good Day all, I'm new here and just wanted to say Hi!
I have always wanted an old boat anchor radio since getting first licensed about 20yrs ago. I found an old Drake TR4C at an acceptable price on ebay and purchased it and have made a few contacts? CW with the rig. The radio is very nice and all that I had expected it to be. She is going off for a "full service" tune up and having a new faceplate put on since the prior owner drilled a hole it it.? When it's back, I hope to work some of you Drake to Drake CW. Do you guys have a favored calling frequency on 40?
Thanks again.
Rich
KQ9L
|
Welcome to my bench.? Today, we will look at demonic possession of a BFO.
Recap: BFO doesn't work with switch in any of the BFO positions.? Notice short note when switching from BFO modes to AM, right at make & break of rotary switch contacts? AM works normally.
Replaced Q6, subbed C166, C163, and even T11.? Removed both screws holding down the BFO board and they're clean on the underside.? Continuity to the chassis is good.? R124, 141 are good. Checked C168, 166 and 163 with cap meter and Sprague TO-6
The only way that I can get the BFO to come on and oscillate is by shorting the switch contact that feeds the AM detector's voltage divider to the other contacts.? When I do that, the set works normally with expected AGC behaviour in each position.? All points that should be at ground/chassis potential are where they should be.? The germanium diodes all measure around 0.230 V.? T11 adjusts the frequency and it's in the range (a scope probe pulls the frequency a couple of kHz).
C162 appears to be a base bypass.? Unfortunately for me I don't have another .05 ceramic cap at the moment but did try a .047 film cap, with no change. The switch has been cleaned.
What am I missing?? It's probably something dumb but I am just not seeing it!
TNX & 73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
|
Joseph Nicholas Graif - K4JNG
i¡¯ll have to get workin¡¯ on that extra class upgrade... ? joseph n. graif personal account ?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]> On Behalf Of Rob Peebles, W8LX Sent: Friday, June 24, 2022 1:59 PM To: [email protected]Subject: Re: [DRAKE-RADIO] Good Day All ? On Fri, Jun 24, 2022 at 09:33 AM, richlim11 wrote: When it's back, I hope to work some of you Drake to Drake CW. Do you guys have a favored calling frequency on 40?
Hi Rich,
When I'm in the shack I usually have something parked on 7023 kHz.? Pretty easy flip of the antenna switch to go between the R-4C/T-4XC and TR-4Cw/RIT so you could get two for one!? Make some noise when you've got it back or grab me off list.
73,
Rob, W8LX
Columbus, Ohio
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On Fri, Jun 24, 2022 at 09:33 AM, richlim11 wrote:
When it's back, I hope to work some of you Drake to Drake CW. Do you guys have a favored calling frequency on 40?
Hi Rich, When I'm in the shack I usually have something parked on 7023 kHz.? Pretty easy flip of the antenna switch to go between the R-4C/T-4XC and TR-4Cw/RIT so you could get two for one!? Make some noise when you've got it back or grab me off list. 73, Rob, W8LX Columbus, Ohio
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Gary WB6OGD