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Only showing 9MHZ on DD-103

Mark N2DMI All Messages By This Member #84459 I removed my PTO on the TR-4CW/RIT so that I could clean it. The cleaning went well. I tested the PTO out with my spectrum analyzer and the PTO has a strong signal that adjusts (I believe it was?) 4.9-5.5 MHZ. When I reattached the PTO back to the rig I don’t get any stations. I attached my digital DD-103 to the bottom jones plug and it only displays 9MHZ. I took many photos of the 4 wires off of the PTO to the rig and I did not have any problems re-connecting the wires. I am a very good soldered by the way. My rig now just sits here because I haven’t a clue on what to do next! Can anyone please help me? Thank you! Mark ?
Ken, WA2LBI All Messages By This Member #84461 Mark, Do you have the manual and schematic?for the TR-4? What pin are you monitoring on the bottom Jones socket? Have you directly monitored the internal TR-4 VFO output? Ken WA2LBI toggle quoted message Show quoted text On Fri, Apr 18, 2025 at 5:53?AM Mark N2DMI via <markkiziuk1=[email protected]> wrote: I removed my PTO on the TR-4CW/RIT so that I could clean it. The cleaning went well. I tested the PTO out with my spectrum analyzer and the PTO has a strong signal that adjusts (I believe it was?) 4.9-5.5 MHZ. When I reattached the PTO back to the rig I don’t get any stations. I attached my digital DD-103 to the bottom jones plug and it only displays 9MHZ. I took many photos of the 4 wires off of the PTO to the rig and I did not have any problems re-connecting the wires. I am a very good soldered by the way. My rig now just sits here because I haven’t a clue on what to do next! Can anyone please help me? Thank you! Mark ?
Mark N2DMI All Messages By This Member #84463 Hi Ken, when I come home from work I can look more at the rig and hopefully answer those questions. And yes I have the manual, procedure and service manual. Mark
Craig W8CS All Messages By This Member #84470 Hi Mark- ? I think we've all been in your shoes before. You disassemble something that works, and when you put it back together it no longer works.? ? The only thing that has saved my bacon over the years when I work on this gear is to SLOW DOWN and do the following:? ? take notes on everything that you do. Describe what is is that are doing as if someone else was going to pick up the job. I have notes on my rigs from 1997.? take pictures and sketch things out If you follow a very structured pattern, you're much more likely to have a working radio after mods and the initial smoke test. This is what HeathKit did so well years ago.? ? If something doesn't work after I've messed with it, I 100% know that it's something that I have done...now I just need to follow my own breadcrumb trail to figure out what I did wrong.? -- Craig/W8CS Greenville, SC
Mark N2DMI All Messages By This Member #84471 I have a TR4-CW and I have a TR4-CW/RIT. I purchased both rigs less than 2 months ago. I also purchased a DD-103 which was wired for TR4. The DD-103 to the best of my knowledge is wired correctly. The DD-103 worked on both the TR4-CW and on the TR4-CW/RIT. I noticed that when I turned the main tuning knob on the newly acquired TR4_CW/RIT that with every revolution it would make some kind of a scraping sound. I posted on this group of what it could be? I took alot of photos of the 4 wires and the disassembly of the PTO. It was pretty much straight forward removing 4 wires and removing the screws and such for the PTO. After removal of the PTO I discovered that gears did not line up correctly. By lightly bending a piece of metal that one of the gears was attached to quickly fixed the mis-alignment. I then simply re-installed the PTO and connected the 4 wires correctly! I then connected my rig to my antenna but heard no stations. I then removed the PTO, connected an external 9 Volt (I believe it was 9V?) and used my signal generator to pick up the PTO signal from its wire. Perfect signal, perfect strength and tracked up and down entirely across the band. I think it outputted 4.8-5.6 Mhz. Nothing wrong with the PTO! I connected the wires back up to the PTO and again no signals! I then put the spectrum analyzer close to the PTO signal output to see if the signal was being loaded down and I still have signal output that tracks the PTO. Out of curiosity I connected my working DD-103 to the jones connector and it reads 9Mhz. And no I have not monitored the internal TR-4 VFO. I don't know where that is? Mark ? ?
Ken, WA2LBI All Messages By This Member #84472 Sorry, Mark, I called it a VFO but I meant PTO.? Do you have an oscilloscope? You could verify that the PTO signal is not being?attenuated or determining where it is being lost.? Ken WA2LBI toggle quoted message Show quoted text On Fri, Apr 18, 2025 at 7:25?PM Mark N2DMI via <markkiziuk1=[email protected]> wrote: I have a TR4-CW and I have a TR4-CW/RIT. I purchased both rigs less than 2 months ago. I also purchased a DD-103 which was wired for TR4. The DD-103 to the best of my knowledge is wired correctly. The DD-103 worked on both the TR4-CW and on the TR4-CW/RIT. I noticed that when I turned the main tuning knob on the newly acquired TR4_CW/RIT that with every revolution it would make some kind of a scraping sound. I posted on this group of what it could be? I took alot of photos of the 4 wires and the disassembly of the PTO. It was pretty much straight forward removing 4 wires and removing the screws and such for the PTO. After removal of the PTO I discovered that gears did not line up correctly. By lightly bending a piece of metal that one of the gears was attached to quickly fixed the mis-alignment. I then simply re-installed the PTO and connected the 4 wires correctly! I then connected my rig to my antenna but heard no stations. I then removed the PTO, connected an external 9 Volt (I believe it was 9V?) and used my signal generator to pick up the PTO signal from its wire. Perfect signal, perfect strength and tracked up and down entirely across the band. I think it outputted 4.8-5.6 Mhz. Nothing wrong with the PTO! I connected the wires back up to the PTO and again no signals! I then put the spectrum analyzer close to the PTO signal output to see if the signal was being loaded down and I still have signal output that tracks the PTO. Out of curiosity I connected my working DD-103 to the jones connector and it reads 9Mhz. And no I have not monitored the internal TR-4 VFO. I don't know where that is? Mark ? ?
Jim Shorney All Messages By This Member #84473 Here is your circuit. The PTO feeds the grid of V1B via R48. I think I would look at R48 first, then make some checks around V1. Disclaimer: I have not been inside any TR4 in decades. On Fri, 18 Apr 2025 16:25:17 -0700 "Mark N2DMI via groups.io" <markkiziuk1@...> wrote: I connected the wires back up to the PTO and again no signals! I then put the spectrum analyzer close to the PTO signal output to see if the signal was being loaded down and I still have signal output that tracks the PTO. Out of curiosity I connected my working DD-103 to the jones connector and it reads 9Mhz. -- 73 -Jim NU0C
n4buq All Messages By This Member #84474 Did you possibly mean R148? Also, the signal would go from that resistor through C12 to the grid. 73, Barry - N4BUQ toggle quoted message Show quoted text Here is your circuit. The PTO feeds the grid of V1B via R48. I think I would look at R48 first, then make some checks around V1. Disclaimer: I have not been inside any TR4 in decades. On Fri, 18 Apr 2025 16:25:17 -0700 "Mark N2DMI via groups.io" <markkiziuk1@...> wrote: I connected the wires back up to the PTO and again no signals! I then put the spectrum analyzer close to the PTO signal output to see if the signal was being loaded down and I still have signal output that tracks the PTO. Out of curiosity I connected my working DD-103 to the jones connector and it reads 9Mhz. -- 73 -Jim NU0C
Jim Shorney All Messages By This Member #84475 Forgot the attachment. On Fri, 18 Apr 2025 19:43:58 -0500 "Jim Shorney via groups.io" <jimNU0C@...> wrote: Here is your circuit. The PTO feeds the grid of V1B via R48. I think I would look at R48 first, then make some checks around V1. Disclaimer: I have not been inside any TR4 in decades. On Fri, 18 Apr 2025 16:25:17 -0700 "Mark N2DMI via groups.io" <markkiziuk1@...> wrote: I connected the wires back up to the PTO and again no signals! I then put the spectrum analyzer close to the PTO signal output to see if the signal was being loaded down and I still have signal output that tracks the PTO. Out of curiosity I connected my working DD-103 to the jones connector and it reads 9Mhz. -- 73 -Jim NU0C 2025-04-18_19h34_50.png
n4buq All Messages By This Member #84476 Apologies. I wasn't thinking of the face that Mark has a TR-4C, not a plain TR-4. R48 is indeed the correct resistor in the C model. 73, Barry - N4BUQ toggle quoted message Show quoted text Did you possibly mean R148? Also, the signal would go from that resistor through C12 to the grid. 73, Barry - N4BUQ Here is your circuit. The PTO feeds the grid of V1B via R48. I think I would look at R48 first, then make some checks around V1. Disclaimer: I have not been inside any TR4 in decades. On Fri, 18 Apr 2025 16:25:17 -0700 "Mark N2DMI via groups.io" <markkiziuk1@...> wrote: I connected the wires back up to the PTO and again no signals! I then put the spectrum analyzer close to the PTO signal output to see if the signal was being loaded down and I still have signal output that tracks the PTO. Out of curiosity I connected my working DD-103 to the jones connector and it reads 9Mhz. -- 73 -Jim NU0C
n4buq All Messages By This Member #84477 I meant "fact", not "face". Ugh. Friday night fingers at work. Barry - N4BUQ toggle quoted message Show quoted text Apologies. I wasn't thinking of the face that Mark has a TR-4C, not a plain TR-4. R48 is indeed the correct resistor in the C model. 73, Barry - N4BUQ Did you possibly mean R148? Also, the signal would go from that resistor through C12 to the grid. 73, Barry - N4BUQ Here is your circuit. The PTO feeds the grid of V1B via R48. I think I would look at R48 first, then make some checks around V1. Disclaimer: I have not been inside any TR4 in decades. On Fri, 18 Apr 2025 16:25:17 -0700 "Mark N2DMI via groups.io" <markkiziuk1@...> wrote: I connected the wires back up to the PTO and again no signals! I then put the spectrum analyzer close to the PTO signal output to see if the signal was being loaded down and I still have signal output that tracks the PTO. Out of curiosity I connected my working DD-103 to the jones connector and it reads 9Mhz. -- 73 -Jim NU0C
Jim Shorney All Messages By This Member #84478 Looks like R48 on the marginal scans of schematics that I have. 100 Ohms feeding the grid. C12 would be included in "checks around V1". On Fri, 18 Apr 2025 21:06:38 -0400 (EDT) "n4buq via groups.io" <n4buq@...> wrote: Did you possibly mean R148? Also, the signal would go from that resistor through C12 to the grid. 73, Barry - N4BUQ Here is your circuit. The PTO feeds the grid of V1B via R48. I think I would look at R48 first, then make some checks around V1. Disclaimer: I have not been inside any TR4 in decades. On Fri, 18 Apr 2025 16:25:17 -0700 "Mark N2DMI via groups.io" <markkiziuk1@...> wrote: I connected the wires back up to the PTO and again no signals! I then put the spectrum analyzer close to the PTO signal output to see if the signal was being loaded down and I still have signal output that tracks the PTO. Out of curiosity I connected my working DD-103 to the jones connector and it reads 9Mhz. -- 73 -Jim NU0C -- 73 -Jim NU0C
Mark N2DMI All Messages By This Member #84479 Ken, I do have an O-scope. So your saying to remove the PTO signal wire from R48 and then measure the PTO output signal voltage. Then re-connect the PTO signal wire back to R48 and use the O-scope to measure the voltage to where the PTO signal wire gets connected to R48 and check to see how much of a voltage drop I get? Well I believe I would get some kind of a voltage drop. I think since I have also a TR-4CW is to do the same two measurements to my other rig so that I know what the voltage measurements on an O-scope should be otherwise I would not know if the 2 measurements on my TR-4CW/RIT are correct. Mark
Mark N2DMI All Messages By This Member #84480 I think its R148 and not R48 Ken. Mark
Mark N2DMI All Messages By This Member #84481 The 9Mhz showing up on my DD-103 must mean something?? 9Mhz is in the rig somewhere, right? Mark
Jim Shorney All Messages By This Member #84482 It's a high impedance circuit so drop across 100 Ohms would be minimal. What I would suggest is that you check R48 for visible damage, bad solder connections, and measure it for value with your Ohmmeter. On Fri, 18 Apr 2025 18:19:18 -0700 "Mark N2DMI via groups.io" <markkiziuk1@...> wrote: Then re-connect the PTO signal wire back to R48 and use the O-scope to measure the voltage to where the PTO signal wire gets connected to R48 and check to see how much of a voltage drop I get? Well I believe I would get some kind of a voltage drop. I think since I have also a TR-4CW is to do the same two measurements to my other rig so that I know what the voltage measurements on an O-scope should be otherwise I would not know if the 2 measurements on my TR-4CW/RIT are correct. -- 73 -Jim NU0C
Jim Shorney All Messages By This Member #84483 The IF frequency is 9 MHz but you should not be seeing it at R48. It seams to me that any 9 Mhz leakage should not be strong enough to be picked up by the counter over the PTO signal. On Fri, 18 Apr 2025 18:23:22 -0700 "Mark N2DMI via groups.io" <markkiziuk1@...> wrote: The 9Mhz showing up on my DD-103 must mean something?? 9Mhz is in the rig somewhere, right? Mark -- 73 -Jim NU0C
Gary Follett All Messages By This Member #84484 开云体育 First check to see that you have the 10 volts DC to the PTO. Then measure the resistance from the PTO Output to ground. It should be above 270 ohms. Then use your scope or spectrum analyzer to observe the PTO Output at the PTO and then at ?V1 pin 2. You should clearly see the PTO signal there. Report back. Gary W0DVN toggle quoted message Show quoted text On Apr 18, 2025, at 8:18?AM, Mark N2DMI via groups.io <markkiziuk1@...> wrote: ? Hi Ken, when I come home from work I can look more at the rig and hopefully answer those questions. And yes I have the manual, procedure and service manual. Mark
Mark N2DMI All Messages By This Member #84485 Hey Gary and everyone, when I come home from work this afternoon I will try to set up the Drake and take those measurements. It would be nice to get it working. Mark
Mark N2DMI All Messages By This Member #84500 Hey Gary I finally got some time to take a look at my rig: ? All tubes were pulled from my other TR-4CW rig and put into the TR-4CW/RIT rig because the tubes work and all tested strong on my calibrated tube tester. ? Here are the results to the questions you have asked me. ? 10 Volts does go to the PTO ? PTO puts out a strong signal on my spectrum analyzer when measured to where the signal wire goes to on the small board and tracks from 4.8-5.6 Mhz (100Khz lower and higher than what is printed on the PTO case but most likely correct) ? PTO signal to ground measures 327.2 ohms ? PTO signal on small board measures -27.2dB on my spectrum analyzer when directly coupled ? V1 pin 2 reads same signal but at -61.7dB on my spectrum analyzer when directly coupled ? Ohmed out where PTO signal goes to small board to pin 2 on V1 tube and I measure 104 ohms ? QSL? ? Mark ? ? ?

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