Re: Drake TR-7 - A repair journey
Awseome! I'm glad you got it up and running. Another prodigal child returns to the flock. I feel your pain, my local noise floor has increased dramatically in recent years. On 80m particularly, S-9+ although Clipperton was heard through it on CW. Tell us about your DF loop. :) 73 -Jim NU0C On Tue, 20 Feb 2024 09:20:19 -0800 "atlasstuff" <g4fph@...> wrote: Jim,
I added a 68 R in series with the existing R2303 (which was 47 R). That brought the driver standing current down to about 220 mA, which seems reasonable to me and is more in line with your note. At max RF out, the driver DC current peaks to around 700 mA, so nine and a bit Watt going in.
As with the rest of this TR-7, I am not the first to crack open the PA brick. The final devices are MRF421, with a 1990 date code, which is great. The driver transistors had been changed at least once prior to my putting Japanese ones in.
I did the ALC mod. and added the HPF ground strap, followed by an alignment and screwed the screening plates back in place, but not yet put the covers back on;-)
Imagine my joy to find most of HF to be covered by some new, pulsing, buzzing interference:-( Out with the DF loop tomorrow, I think. Be nice to get some fresh air after all the solder smoke - HI!
Regards,
Mark, G4FPH.
-- 73 -Jim NU0C
|
Re: Drake TR-7 - A repair journey
Jim,
I added a 68 R in series with the existing R2303 (which was 47 R). That brought the driver standing current down to about 220 mA, which seems reasonable to me and is more in line with your note. At max RF out, the driver DC current peaks to around 700 mA, so nine and a bit Watt going in.
As with the rest of this TR-7, I am not the first to crack open the PA brick. The final devices are MRF421, with a 1990 date code, which is great. The driver transistors had been changed at least once prior to my putting Japanese ones in.
I did the ALC mod. and added the HPF ground strap, followed by an alignment and screwed the screening plates back in place, but not yet put the covers back on;-)
Imagine my joy to find most of HF to be covered by some new, pulsing, buzzing interference:-( Out with the DF loop tomorrow, I think. Be nice to get some fresh air after all the solder smoke - HI!
Regards,
Mark, G4FPH.
|
The 11volts comes from a big wirewound dropping resistor from the 150V.? See the schematic and look for the resistor.
Hopefully they didn't remove it for the previous mods.
73,
Gary
WB6OGD
?
|
Re: R-4B: Garbled Audio on 40m
It¡¯s cool what we found on the various 2-B¡¯s we worked on last year. I had two other ones besides that horrorshow.?
One of the others sounded obviously like the PBT needed adjustment, so I finally figured how to do it without removing the slug rack. I have a full set of those D-C adjustment tools and there are a couple ?that are short enough where I can get them in there.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Tue, Feb 20, 2024 at 10:23, Gary WB6OGD < winbladgary@...> wrote: Yes Steve, the one with the glue inside for lubrication, hi hi...
It had to come apart for that anyway.
73,
Gary
WB6OGD
|
Hmmm. ?On two different transmitters, with a diverse collection of mics¡
Did you do alignments on both? ?I¡¯m trying to find a common thread.?
How is the carrier balance? ?I set carrier balance with an oscilloscope, which is much easier than their plate current procedure.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Tue, Feb 20, 2024 at 10:06, Mark KF0KZP < fleischtpnl@...> wrote: I will put up some pictures of my setup and what it looks like on my other radios later tonight when i get home or tomorrow morning. Thanks for the help.
Mark
On Tue, Feb 20, 2024 at 8:55?AM Mark KF0KZP via <fleischtpnl= [email protected]> wrote: Both. I have listened on a couple different radios I have and have seen the signal on the waterfall on those radios. I have also gotten a report back from another Ham who said there was to much RFI(noise) that he could hear me but it was so noisy. When I key the mic in SSB the signal(on my other radios looks good but when I apply any audio the signal spreads out across both sides of the carrier(which isn't there for SSB) but looks almost the same as transmitting on AM. Which again when I switch over to transmit in AM it sounds good. The distortion sounds (I know not technical) like when you are tuning in a signal and you go from the high pitch past the good signal to the lower pitch. I have run it through a manual tuner Drake RC-4 and through an automatic antenna tuner. It is also the same if I run it into a dummy load or into an antenna. I have read through the manuals and have watched some videos on YouTube and seem to be doing everything correctly. Again, I'm hoping it is something simple that I'm missing. Thanks for the help.
Mark
On Mon, Feb 19, 2024 at 7:34?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Mark, when you say you're distorted on SSB, is that your monitoring on another receiver or are others saying that your signal sounds distorted?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with secure email.
On Monday, February 19th, 2024 at 6:38 PM, Mark KF0KZP < fleischtpnl@...> wrote:
I am new to collecting Drake radios but so far love the radios. I have a R-4C & T-4xc(combo) and I also have a TR-4. I am having the same issues with both so I am obviously doing something wrong. Receiving is working fine on the C-Line and the TR-4. I can also tune both of them as per manuals. They are both putting out power on all bands. CW seems to work fine and AM is clear when transmitting but on both when on SSB the signal is distorted and a lot of RFI. I have tried the Heil AD-1-C with the Pro-7 Headphones and also a Shure SM7B microphone. Then I talked to one of the engineers at Heil and I purchased the CC-1-C cable and the Gold Elite Vintage microphone and have the same issues. What am I missing and where should I start? Thanks for the help and look forward to hearing some things I should try.
Mark
KF0KZP
--
Mark "Fleisch" Fleischer KF?KZP 
Public Address Announcer/Voice Over/Production Specialist:
, , , , , , (Superior), and (Proctor)
--
Mark "Fleisch" Fleischer KF?KZP
Public Address Announcer/Voice Over/Production Specialist:
, , , , , , (Superior), and (Proctor)
|
It¡¯s a TR-4.?
Yeah, I do this, too. Don¡¯t feel bad, Mark :-)
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Tue, Feb 20, 2024 at 09:56, Mark - WB0IQK < mgilger@...> wrote: Joel,
I would look again for the pot. All R4B's have it. Even the earlier R4A and R4's.
The procedure you want to follow is paragraph 6.4.9 then look at Figure 13 and you will see at the bottom the RCV SENS
Good luck,
Mark, WB0IQK
|
Dean - You have done an awesome restoration on your 2B; super congratulations on what you have done.? The front panel looks just like Drake made it.....minus the original knobs....however, yours looks terrific.? I have a 2B, original...yours look 'almost' better than mine.? Well done sir!?? 73, Larry KC8JX
On Tuesday, February 20, 2024 at 09:35:49 AM EST, K5DH via groups.io <mustang_maniac@...> wrote:
I bought a restorable 2B with 2AC off Craigslist last year from a fellow ham in Florida for $50 plus shipping.? It did not require any unusual work to get it going.? I replaced a couple of weak tubes, replaced all of the electrolytic caps, touched up the alignment, replaced the missing 100 KHz calibrator crystal, and installed a 3-wire line cord for safety.? That was all it took to make it work right.? While I had it on the bench, I removed the front panel, cleaned it with soap and water, then used a mild automotive polishing compound to remove paint oxidation and bring up the shine.? I have since added crystals for 30 meters and the "A" segment of 10 meters using the little HC-49 crystals installed in HC-6 holders.? When I received the 2B the only original Drake knob it had was the FREQUENCY knob.? The rest were old generic knobs out of someone's junkbox.? I installed a matching set of modern aluminum knobs purchased off eBay.? They don't look "right" but they don't look bad, and they'll do until I can find the correct knobs.?  73, Dean K5DH
|
Re: R-4B: Garbled Audio on 40m
Yes Steve, the one with the glue inside for lubrication, hi hi...
It had to come apart for that anyway.
73,
Gary
WB6OGD
|
Look back at my post #72582
I just checked, they still are selling the last 2 knobs!?? I thought I bought the last two!!
Not cheap but available.? Keep the guitar guys from buying them up.
73,
Gary
WB6OGD
|
I will put up some pictures of my setup and what it looks like on my other radios later tonight when i get home or tomorrow morning.? Thanks for the help.
Mark
On Tue, Feb 20, 2024 at 8:55?AM Mark KF0KZP via <fleischtpnl= [email protected]> wrote: Both.? I have listened on a couple different radios I have and have seen the signal on the waterfall on those radios.? I have also gotten a report back from another Ham who said there was to much RFI(noise) that he could hear me but it was so noisy.? When I key the mic in SSB the signal(on my other radios looks good but when I apply any audio the signal spreads out across both sides of the carrier(which isn't there for SSB) but looks almost the same as transmitting on AM.? Which again when I switch over to transmit in AM it sounds good.? The distortion sounds (I know not technical) like when you are tuning in a signal and you go from the high pitch past the good signal to the lower pitch.? I have run it through a manual tuner Drake RC-4 and through an automatic antenna tuner.? It is also the same if I run it into a dummy load or into an antenna.? I have read through the manuals and have watched some videos on YouTube and seem to be doing everything correctly.? ?Again, I'm hoping it is something simple that I'm missing.? Thanks for the help.
Mark??
On Mon, Feb 19, 2024 at 7:34?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Mark, when you say you're distorted on SSB, is that your monitoring on another receiver or are others saying that your signal sounds distorted?
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, February 19th, 2024 at 6:38 PM, Mark KF0KZP < fleischtpnl@...> wrote:
I am new to collecting Drake radios but so far love the radios.? I have a R-4C & T-4xc(combo) and I also have a TR-4.? I am having the same issues with both so I am obviously doing something wrong.? Receiving is working fine on the C-Line and the TR-4.? I can also tune both of them as per manuals.? They are both putting out power on all bands.? CW seems to work fine and AM is clear when transmitting but on both when on SSB the signal is distorted and a lot of RFI.? I have tried the Heil AD-1-C with the Pro-7 Headphones and also a Shure SM7B microphone.? Then I talked to one of the engineers at Heil and I purchased the CC-1-C cable and the Gold Elite Vintage microphone and have the same issues.? What am I missing and where should I start?? Thanks for the help and look forward to hearing some things I should try.
Mark
KF0KZP
--
Mark "Fleisch" Fleischer KF?KZP
Public Address Announcer/Voice Over/Production Specialist:?
,?,?, ,?,?,?(Superior), and?(Proctor)
-- Mark "Fleisch" Fleischer KF?KZP
Public Address Announcer/Voice Over/Production Specialist:?
,?,?, ,?,?,?(Superior), and?(Proctor)
|
Joel, I would look again for the pot. All R4B's have it. Even the earlier R4A and R4's. The procedure you want to follow is paragraph 6.4.9 then look at Figure 13 and you will see at the bottom the RCV SENS Good luck, Mark, WB0IQK 
|
Both.? I have listened on a couple different radios I have and have seen the signal on the waterfall on those radios.? I have also gotten a report back from another Ham who said there was to much RFI(noise) that he could hear me but it was so noisy.? When I key the mic in SSB the signal(on my other radios looks good but when I apply any audio the signal spreads out across both sides of the carrier(which isn't there for SSB) but looks almost the same as transmitting on AM.? Which again when I switch over to transmit in AM it sounds good.? The distortion sounds (I know not technical) like when you are tuning in a signal and you go from the high pitch past the good signal to the lower pitch.? I have run it through a manual tuner Drake RC-4 and through an automatic antenna tuner.? It is also the same if I run it into a dummy load or into an antenna.? I have read through the manuals and have watched some videos on YouTube and seem to be doing everything correctly.? ?Again, I'm hoping it is something simple that I'm missing.? Thanks for the help.
Mark??
On Mon, Feb 19, 2024 at 7:34?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Mark, when you say you're distorted on SSB, is that your monitoring on another receiver or are others saying that your signal sounds distorted?
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, February 19th, 2024 at 6:38 PM, Mark KF0KZP < fleischtpnl@...> wrote:
I am new to collecting Drake radios but so far love the radios.? I have a R-4C & T-4xc(combo) and I also have a TR-4.? I am having the same issues with both so I am obviously doing something wrong.? Receiving is working fine on the C-Line and the TR-4.? I can also tune both of them as per manuals.? They are both putting out power on all bands.? CW seems to work fine and AM is clear when transmitting but on both when on SSB the signal is distorted and a lot of RFI.? I have tried the Heil AD-1-C with the Pro-7 Headphones and also a Shure SM7B microphone.? Then I talked to one of the engineers at Heil and I purchased the CC-1-C cable and the Gold Elite Vintage microphone and have the same issues.? What am I missing and where should I start?? Thanks for the help and look forward to hearing some things I should try.
Mark
KF0KZP
-- Mark "Fleisch" Fleischer KF?KZP
Public Address Announcer/Voice Over/Production Specialist:?
,?,?, ,?,?,?(Superior), and?(Proctor)
|
I bought a restorable 2B with 2AC off Craigslist last year from a fellow ham in Florida for $50 plus shipping.? It did not require any unusual work to get it going.? I replaced a couple of weak tubes, replaced all of the electrolytic caps, touched up the alignment, replaced the missing 100 KHz calibrator crystal, and installed a 3-wire line cord for safety.? That was all it took to make it work right.? While I had it on the bench, I removed the front panel, cleaned it with soap and water, then used a mild automotive polishing compound to remove paint oxidation and bring up the shine.? I have since added crystals for 30 meters and the "A" segment of 10 meters using the little HC-49 crystals installed in HC-6 holders.? When I received the 2B the only original Drake knob it had was the FREQUENCY knob.? The rest were old generic knobs out of someone's junkbox.? I installed a matching set of modern aluminum knobs purchased off eBay.? They don't look "right" but they don't look bad, and they'll do until I can find the correct knobs.?  73, Dean K5DH
|
Hi
I would suggest to purchase the CDs from K0OAH. These are invaluable if you work on these machines. These, plus the circuit diagram will provide you the answer.?
k4oah@...
I could open my TR4C to make some pictures, but that wil be tomorrow earliest
73 Rob
Verstuurd vanaf mijn iPhone
toggle quoted message
Show quoted text
Op 20 feb 2024 om 13:10 heeft Electronica valvulas <Clubyaesu@...> het volgende geschreven: ?Thanks for your response, where is that 11vdc point? I can't find it. thanks, again
|
Re: R-4B: Garbled Audio on 40m
Holy cow! ?Was the one I sold you?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Mon, Feb 19, 2024 at 22:28, Gary WB6OGD < winbladgary@...> wrote: Adjusting the coils is fairly easy.. unless..? someone has been there before.
I had a 2B that was so mis-adjusted that I had to take it apart and adjust them to all be close to the same length first.
You might be able to see that the ends are the same length.? Mine were damaged and bent so I couldn't just do that.
73,
Gary
WB6OGD
|
Thanks for your response, where is that 11vdc point? I can't find it. thanks, again
|
Hi
Coincidentally I replaced the PTO of my R-4C yesterday. The red-white wire from the PTO is for the +11 Volt supply of the PTO.?
73 Rob Verstuurd vanaf mijn iPhone
toggle quoted message
Show quoted text
Op 20 feb 2024 om 12:19 heeft Electronica valvulas <Clubyaesu@...> het volgende geschreven: ?Hello, I am restoring a tr4cw, with some problems, at some point they made a modification to install a dds, I have noticed that there is a loose white/red cable that comes from the pto, I can't see where it was connected. Could someone tell me the connection location with any image? thank you
|
Hello, I am restoring a tr4cw, with some problems, at some point they made a modification to install a dds, I have noticed that there is a loose white/red cable that comes from the pto, I can't see where it was connected. Could someone tell me the connection location with any image? thank you
|
Re: RV-75 only decrements
Check Optical Interrupter Bias, section 5-5.4, and Optical Interrupter Mechanical Adjustment 5-5.d. Note that a mechanical VTVM or VOM is specified for alignments. If all that is good check the direction logic, 5-5.7. 73, -Jim NU0C On Mon, 19 Feb 2024 21:36:43 -0800 "K6OXN Bob" <bobk6oxn@...> wrote: The RV-75 I am working on, only decrements it will not increment. Either way I turn it, it only goes down in freq. Any clues are most helpful.
|
The RV-75 I am working on, only decrements it will not increment. Either way I turn it, it only goes down in freq. Any clues are most helpful.
|
Jim Shorney
Gary WB6OGD
Rob PA9Z