Are the other bands working?
On Fri, Dec 27, 2024 at 11:54 AM, Jay W6CJ via groups.io < lastradioman@...> wrote:
Group,
I'd welcome any advice on where to start looking.??
The 5A fuse on the AC4 blew in my absence.
Replaced the fuse, and cannot get a peak greater than 0.1A when switching from SSB to tune, regardless of the gain setting on 80 and 40.??
D'oh.....? ??
73
Jay
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Re: Drake L7 10m modification
My L7 had a shorting trace as well but I chose to remove the filter because that was where I mounted the step start, soft key and bias board at.?
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On Dec 27, 2024, at 10:49?AM, Evan via groups.io <k9sqg@...> wrote:
?
On one L7 that I serviced it had a "shorting" trace on the 11M filter?
Yes it had the band pass filter. I removed it. Now to "unlock" the band selector and add a capacitor.?
Thanks
Roger
Sent from my T-Mobile 5G Device
-------- Original message --------
From: "amfone via groups.io" <amfone20000@...>
Date: 12/24/24 10:02 AM (GMT-05:00)
Subject: Re: [DRAKE-RADIO] Drake L7 10m modification
They also used a filter to prevent 11 meter operation in some of the amps. I don't know if they were the earlier L7's or the later ones?
Merry Christmas to all and happy holidays.
Tim
WB8UHZ
On Tuesday, December 24, 2024 at 08:39:41 AM EST, Roger KW4EMF <rogerlhill@...> wrote:
Ok. Thanks. That is a tiny crack to go through to get it. I tried to run my snake camera down in there to get a look but can't get it in there. I just removed the one small plate over the input tuning coils.
Sent from my T-Mobile 5G Device
-------- Original message --------
From: "Evan via groups.io" <k9sqg@...>
Date: 12/23/24 10:59 PM (GMT-05:00)
Subject: Re: [DRAKE-RADIO] Drake L7 10m modification
Roger,
To my knowledge Drake used 3 different schemes to lockout 10/11 meters from the CB crowd. ?The one you have sounds like the one where there is a round head screw with/without a nut, something like a cap screw, possibly with an Allen head. ?The
best way to remove it, I've found, is to do it from the bottom. ? However, ?do be careful and stuff some painters tape, or kleenex, ?or something "below" where that screw/nut might fall. ?That way you can capture it before it gets into some known/unknown location
that could cause further damage upon power up. ?For me, I've found that needle nose pliers worked well with high illumination.
But let's hear what the experts say.
Best of luck.
73,
Evan, K9SQG
I've looked down in the band switch from the bottom and see a small nut. I can't really see the head. What is the best way to get at it? Top or bottom? What type of tools did you use? Going in from the bottom is extremely tight.?
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Group, I'd welcome any advice on where to start looking.??
The 5A fuse on the AC4 blew in my absence. Replaced the fuse, and cannot get a peak greater than 0.1A when switching from SSB to tune, regardless of the gain setting on 80 and 40.??
D'oh.....? ??
73 Jay
|
Re: Drake L7 10m modification
On one L7 that I serviced it had a "shorting" trace on the 11M filter?
Yes it had the band pass filter. I removed it. Now to "unlock" the band selector and add a capacitor.? Thanks Roger
Sent from my T-Mobile 5G Device
-------- Original message -------- From: "amfone via groups.io" <amfone20000@...> Date: 12/24/24 10:02 AM (GMT-05:00) Subject: Re: [DRAKE-RADIO] Drake L7 10m modification
They also used a filter to prevent 11 meter operation in some of the amps. I don't know if they were the earlier L7's or the later ones?
Merry Christmas to all and happy holidays.
Tim
WB8UHZ
On Tuesday, December 24, 2024 at 08:39:41 AM EST, Roger KW4EMF <rogerlhill@...> wrote:
Ok. Thanks. That is a tiny crack to go through to get it. I tried to run my snake camera down in there to get a look but can't get it in there. I just removed the one small plate over the input tuning coils.
Sent from my T-Mobile 5G Device
-------- Original message -------- From: "Evan via groups.io" <k9sqg@...> Date: 12/23/24 10:59 PM (GMT-05:00) Subject: Re: [DRAKE-RADIO] Drake L7 10m modification
Roger,
To my knowledge Drake used 3 different schemes to lockout 10/11 meters from the CB crowd. ?The one you have sounds like the one where there is a round head screw with/without a nut, something like a cap screw, possibly with an Allen head. ?The best way to remove it, I've found, is to do it from the bottom. ? However, ?do be careful and stuff some painters tape, or kleenex, ?or something "below" where that screw/nut might fall. ?That way you can capture it before it gets into some known/unknown location that could cause further damage upon power up. ?For me, I've found that needle nose pliers worked well with high illumination.
But let's hear what the experts say.
Best of luck.
73,
Evan, K9SQG
I've looked down in the band switch from the bottom and see a small nut. I can't really see the head. What is the best way to get at it? Top or bottom? What type of tools did you use? Going in from the bottom is extremely tight.?
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This morning I confirmed that the band switch that switches the 10 volts to either the low VCO or the high VCO is working just fine. Any other ideas why on 15 and 10 meters the display is reading 51 950.0 and does not change any.?
73, Jim VE1RB
On Fri, Dec 27, 2024 at 10:20?AM Jim Harris via <radiove1rb= [email protected]> wrote: I cleaned the pins and sockets on the VCO board today as well as the pins on the main board and saw no change. Have not figured out the best way to clean the band switch. 73, Jim Ve1RB On Wed, Dec 25, 2024 at 10:05?PM Gary Follett via <xntrick1948= [email protected]> wrote: Does the display read 51 950.0 on all the high bands (above 15 MHz)?
Gary
W0DVN
Also check the +24V from the PS board. C2108 can cause strange PLL issues as it fails, and it WILL fail eventually. This is a known failure point in the TR7.On Wed, 25 Dec 2024 14:24:05 -0400"Jim Harris via?" <radiove1rb@...> wrote:Hi Gary,
No I have not seen the frequency change but I have never left that way more
than a few minutes. I already decided to clean the back switch and the
molex pins etc. I will do that as soon as I can and report back here.
Thanks for the suggestion.
73, Jim VE1RB
--?73-JimNU0C
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骋补苍驳…
I have a R8 sitting on my desk I got from a local ham. He went through it and replaced several handfuls of capacitors. The encoder was shot so he machined a new coupling to fit an off the shelf new encoder. Radio works great and looks good.
However!!
The LCD is so dim, it’s hard to see it.
Found the usual Google hits about cleaning contacts and so on. Nothing worked
is there a fix for the dim display? (other than a new LCD)
Mike, WB8VGE
SunLight Energy Systems
The Heathkit Shop
J e e p
o|||||||o?
A man with one clock knows what time it?is. A man with two clocks is never sure.
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Re: TR-4C problem on 40 meters
Peter, look for parts that are used only on 40m.? These include various capacitors and inductors as well as a few resistors.??
Did you smell any smoke before this happened?
I had one TR-4C that had a shorted silver mica capacitor in one of the circuits that gets selected for 40m only.? When it went, it took a resistor with it, which opened up.
73,
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Friday, December 27th, 2024 at 5:15 AM, Peter Ravn via groups.io <fasan5@...> wrote:
My TR-4C works fine on all bands with the exception of 40. Sensitivity is very low as if the antenna was unplugged, hum is heard in the speaker, and there is no ouput.
The S1B-C section of the bandswitch was cleaned, examined carefully and checked with an ohmmeter. Everything seemed fine.
V1 and V3 were replaced.
The 21.5 MHz xtal tested with an external tester and found okay.
Resistance on all pins of V1 to ground spot on.
Voltages on 40 meters on V1 differ on pins 2, 3, 6, 7 and 9 from specs. On pin 2 (grid) +3.7 VDC instead of -2 VDC, on pin 3 (screen) 107 VDC instead of 125 VDC, on pin 6 (anode) 228 VDC instead of 250 VDC, on pin 7 (cathode) 5.26 VDC instead of 2.6 VDC and on pin 9 (grid) +4.7 VDC instead of -1.3 VDC. On 15 and 10 meters all voltages are within specs.
Injection voltage on TP (V1a) cannot be adjusted with L1. Coil and core testet okay with L/C meter and ohmmeter.
Any ideas where to look? Thank you.
Peter OZ8CTH
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I cleaned the pins and sockets on the VCO board today as well as the pins on the main board and saw no change. Have not figured out the best way to clean the band switch. 73, Jim Ve1RB
On Wed, Dec 25, 2024 at 10:05?PM Gary Follett via <xntrick1948= [email protected]> wrote: Does the display read 51 950.0 on all the high bands (above 15 MHz)?
Gary
W0DVN
Also check the +24V from the PS board. C2108 can cause strange PLL issues as it fails, and it WILL fail eventually. This is a known failure point in the TR7.On Wed, 25 Dec 2024 14:24:05 -0400"Jim Harris via?" <radiove1rb@...> wrote:Hi Gary,
No I have not seen the frequency change but I have never left that way more
than a few minutes. I already decided to clean the back switch and the
molex pins etc. I will do that as soon as I can and report back here.
Thanks for the suggestion.
73, Jim VE1RB
--?73-JimNU0C
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TR-4C problem on 40 meters
My TR-4C works fine on all bands with the exception of 40. Sensitivity is very low as if the antenna was unplugged, hum is heard in the speaker, and there is no ouput.
The S1B-C section of the bandswitch was cleaned, examined carefully and checked with an ohmmeter. Everything seemed fine.
V1 and V3 were replaced. ?
The 21.5 MHz xtal tested with an external tester and found okay.
Resistance on all pins of V1 to ground spot on.
Voltages on 40 meters on V1 differ on pins 2, 3, 6, 7 and 9 from specs. On pin 2 (grid) +3.7 VDC instead of -2 VDC, on pin 3 (screen) 107 VDC instead of 125 VDC, on pin 6 (anode) 228 VDC instead of 250 VDC, on pin 7 (cathode) 5.26 VDC instead of 2.6 VDC and on pin 9 (grid) +4.7 VDC instead of -1.3 VDC. On 15 and 10 meters all voltages are within specs.
Injection voltage on TP (V1a) cannot be adjusted with L1. Coil and core testet okay with L/C meter and ohmmeter.
Any ideas where to look? Thank you.
Peter OZ8CTH
?
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Re: CW Filters and Passband Tuning?
Steve & Group,
Found the answer: After email with Frank?@ Noble, I learned that he'd designed the 450 and 250 CW filters with a slight offset that puts the filters on the LSB side of the PBT. 73 Jay W6CJ
The way to check narrow filters and the IF alignment is to zero beat a signal and set the PASSBAND knob to 12 o’clock. Maximum signal strength should occur with the pointer at 12 o’clock.? If this does not occur, check your 5645 oscillator for correct frequency.
There is also a possibility that the BFO is out of alignment (either the oscillator itself or the position of the PASSBAND knob).? The alignment instructions will get you to where you need to be.
73,
On Thu, Dec 26, 2024 at 12:24 PM, Jay W6CJ via < lastradioman@...> wrote:
Group-
I've installed the set of three Noble CW filters in my R4C, and I like them.
I have noticed that if the 500 or 250 CW filter is selected, the passband center is no longer at zero (12 o'clock) - but is at 10 o'clock.
Passband center is OK on SSB or on 1.5.
Thoughts or suggestions?
73,
Jay
W6CJ
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Re: Drake L7 10m modification
It's been a few years but IIRC I used a dental pick to coax the nut off and then popped the screw out. On Thu, 26 Dec 2024 15:20:11 -0500 "Roger KW4EMF via groups.io" <rogerlhill@...> wrote: It doesn't say how to get that little stop screw out of the band switch. I can see it. But don't see any way to access it short of removing the band switch.? -- 73 -Jim NU0C
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Re: R4C Passband Tuning ?
It doesn't say how to get that little stop screw out of the band switch. I can see it. But don't see any way to access it short of removing the band switch.?
Sent from my T-Mobile 5G Device
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-------- Original message -------- From: Bob Loving <bob.loving@...> Date: 12/24/24 5:38 PM (GMT-05:00) Subject: Re: [DRAKE-RADIO] R4C Passband Tuning ?
I am going from memory and do not have a manual in front of me. So here goes.
The incoming signal to the R-4C is converted to the first IF of 5.645-MHz. In the second mixer, SSB and CW signals are converted to 5.695-MHz with the 50-kHz BFO signal.?
The signal passes through the selected the second IF filter to the third mixer. The oscillator for the third mixer is from an oscillator located under the filter shield located rear center, top side of the receiver.?
There is one oscillator with two crystals, one being 5.645-MHz that is used on SSB and CW to produce the 50-kHz third IF. The frequency of the other oscillator I forget but it converts AM signals at 5.645-MHz to 50-kHz.
To get the receiver 5.645-MHz oscillator on the same frequency as the signal on the "Carrier Osc" lead from the T-4XC, there is a variable capacitor for adjustment. It is under that shield on the same PC board with the oscillator and adjustment capacitors of the R-4C. Yes, the other variable capacitor is for the AM oscillator.?
Maybe someone can pipe in here with the capacitor designators.
73 and Merry Christmas to all.
Bob Loving K9JU
Maryville, TN
On Tuesday, December 24, 2024 at 04:25:16 PM EST, Rob Sherwood via groups.io <rob@...> wrote:
Yes. Rob
On Dec 24, 2024, at 1:10?PM, Jay W6CJ via groups.io <lastradioman@...> wrote:
?
Rob,
Connect my service monitor/counter to the CAR OSC jack, and adjust C6 for exactly 5645 Khz?
Tnx&73
Jay
W6CJ
The 5645 kHz LO from the transmitter if off frequency.? Rob, NC0B?
?
Group,
I have my "new" Twins hooked up and making QSOs.
I noticed that with the R4C in LSB, and passband on the LSB "dot" for best LSB reception........? when I turn on the T4XC, I have to re-tune the R4C passband down to the RTTY region, for LSB reception to sound the same.
Is this normal?
What would cause the passband tuning shift?
Merry Christmas & 73
??????
Jay
W6CJ
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They are both the same! ? Joe – W7RKN ? ? do you have a l4b or ?L-7 power supply ??
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do you have a l4b or ?L-7 power supply ?? On Dec 26, 2024, at 1:25?PM, Barry KJ5GQM via groups.io <chasbg@...> wrote:
Tim, I’m interested in your AC-4s. I sent you an email through QTH. ? Barry KJ5GQM
On Tuesday, December 24, 2024 at 11:50:32 AM CST, amfone via groups.io <amfone20000@...> wrote:
I started out with Drake back in 1975 with a TR4C. I used the C line as the main station until 2001, still have several T4XC's, 4 in fact and one R4C, several R4B's, 2C and 2B and amps. I also have several not even sure how many AC-4's which all worked the last time I used them. I've decided I only need two at most for my current Drake gear so why keep the rest. At one time I had 4 C Lines, I just kept buying them. So based on what I've noted I'm going to be selling a bunch of AC 4's.?
If interested send an email, what do you consider they are worth, right? now I don't feel like taking pictures of all of them but look up my call on QTH WB8UHZ and you will see I'm honest as its very easy to just be honest and? tell the truth.
73 Tim and Merry Christmas to all.
?
73’蝉
KK4IZ
Amateur Radio Operator
Warren Bryant?
124 Crestview Dr
Clanton,AL.??35045
Email:?KK4IZ284@...
Cell: 205-389-4170
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Tim, I’m interested in your AC-4s. I sent you an email through QTH. ? Barry KJ5GQM
On Tuesday, December 24, 2024 at 11:50:32 AM CST, amfone via groups.io <amfone20000@...> wrote:
I started out with Drake back in 1975 with a TR4C. I used the C line as the main station until 2001, still have several T4XC's, 4 in fact and one R4C, several R4B's, 2C and 2B and amps. I also have several not even sure how many AC-4's which all worked the last time I used them. I've decided I only need two at most for my current Drake gear so why keep the rest. At one time I had 4 C Lines, I just kept buying them. So based on what I've noted I'm going to be selling a bunch of AC 4's.?
If interested send an email, what do you consider they are worth, right? now I don't feel like taking pictures of all of them but look up my call on QTH WB8UHZ and you will see I'm honest as its very easy to just be honest and? tell the truth.
73 Tim and Merry Christmas to all.
?
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Re: Drake L7 10m modification
I just added a capacitor to mine, that’s all it took.
My SWR is 1.1 to 1.3 across entire 10m band with solid 1kw out and 60w exciter.?
Note: I did not add a capacitor to the 15m pi network as it wasn’t part of the 10m mod.?
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On Dec 26, 2024, at 8:03?AM, Roger KW4EMF <rogerlhill@...> wrote:
?
Thanks Jim. I was wondering if someone out there had made there own input tuning coil for 10m instead of just adding a capacitor.?
Sent from my T-Mobile 5G Device
-------- Original message --------
From: "Jim Shorney via groups.io" <jimNU0C@...>
Date: 12/25/24 7:53 AM (GMT-05:00)
Subject: Re: [DRAKE-RADIO] Drake L7 10m modification
You might want to give this a read.
/g/DRAKE-RADIO/files/Drake%20L7%2010%20Meter%20High%20Input%20SWR%20complete.pdf
On Wed, 25 Dec 2024 07:38:21 -0500
"Roger KW4EMF via groups.io" <rogerlhill@...> wrote:
> Yes it had the band pass filter. I removed it. Now to "unlock" the band selector and add a capacitor.
--
73
-Jim
NU0C
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Re: CW Filters and Passband Tuning?
The way to check narrow filters and the IF alignment is to zero beat a signal and set the PASSBAND knob to 12 o’clock. Maximum signal strength should occur with the pointer at 12 o’clock. ?If this does not occur, check your 5645 oscillator for correct frequency.
There is also a possibility that the BFO is out of alignment (either the oscillator itself or the position of the PASSBAND knob). ?The alignment instructions will get you to where you need to be.
73,
On Thu, Dec 26, 2024 at 12:24 PM, Jay W6CJ via groups.io < lastradioman@...> wrote:
Group-
I've installed the set of three Noble CW filters in my R4C, and I like them.
I have noticed that if the 500 or 250 CW filter is selected, the passband center is no longer at zero (12 o'clock) - but is at 10 o'clock.
Passband center is OK on SSB or on 1.5.
Thoughts or suggestions?
73,
Jay
W6CJ
|
CW Filters and Passband Tuning?
Group- I've installed the set of three Noble CW filters in my R4C, and I like them.
I have noticed that if the 500 or 250 CW filter is selected, the passband center is no longer at zero (12 o'clock) - but is at 10 o'clock.
Passband center is OK on SSB or on 1.5.
Thoughts or suggestions?
73, Jay W6CJ
|
Today most of 6m activity is digital. Not much SSB and even less CW. Rob, NC0B
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On Dec 26, 2024, at 6:58 AM, Dave Edwards via groups.io <kd2e@...> wrote:
?My TR6 has a CW filter installed.
....Dave
On 12/25/2024 1:15 PM EST Lyndon VE7TFX <lyndon@...> wrote:
Another Christmas Day survey :-)
1) Does anyone here own a TR-6 with a CW filter installed? (I do
not need to hear from all the people who DON'T have a CW filter.)
2) If you don't have a TR-6 CW filter, have you ever seen one in
person? Or seen a TR-6 with one installed?
Thanks!
--lyndon
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Re: Drake L7 10m modification
Thanks Jim. I was wondering if someone out there had made there own input tuning coil for 10m instead of just adding a capacitor.?
Sent from my T-Mobile 5G Device
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-------- Original message -------- From: "Jim Shorney via groups.io" <jimNU0C@...> Date: 12/25/24 7:53 AM (GMT-05:00) Subject: Re: [DRAKE-RADIO] Drake L7 10m modification
You might want to give this a read. /g/DRAKE-RADIO/files/Drake%20L7%2010%20Meter%20High%20Input%20SWR%20complete.pdf On Wed, 25 Dec 2024 07:38:21 -0500 "Roger KW4EMF via groups.io" <rogerlhill@...> wrote: > Yes it had the band pass filter. I removed it. Now to "unlock" the band selector and add a capacitor. -- 73 -Jim NU0C
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Thomas W9TAB
Jay W6CJ
Jim Shorney
Rob Sherwood