开云体育

TR-4CW and TR7 Outcomes?

Gary Follett All Messages By This Member #83942 What ever became of the TR7 with issues on the IF/Audio board causing it to be stuck in transmit? Also, wha became of the TR-4CW that had the problem with momentarily going into CW transmit than dropping out? Also, what happened to the TR4-xxx that \had the mouse chirp on power down? It would be nice to close the loops on these. Gary W0DVN
Jim Harris All Messages By This Member #83944 Gary I have not had time to work on the TR7 CW issue, But I think I have it isolated the problem to the switch transistor Q1103 as with the base having?9.4 VDC on receive it still conducts some so instead of 10 volts there is a bit over 5 volts but that is enough to power up the oscillator etc. Guess I am going to have to try and put in some different transistors. It is such a simple circuit it is hard to find the problem. Jim VE1RB toggle quoted message Show quoted text On Sat, Mar 29, 2025 at 3:30?PM Gary Follett via <xntrick1948=[email protected]> wrote: What ever became of the TR7 with issues on the IF/Audio board causing it to be stuck in transmit? Also, wha became of the TR-4CW that had the problem with momentarily going into CW transmit than dropping out? Also, what happened to the TR4-xxx that \had the mouse chirp on power down? It would be nice to close the loops on these. Gary W0DVN
Terry WB0VQP All Messages By This Member #83953 ?Gary, I removed and disassembled the mode switch in the TR4C again and found some additional questionable contacts which I very gently adjusted for good contact.? Reassembled?it and that made no difference in the intermittent?transmit?on?CW and AM.? I haven't gotten back to it again this week.? ?I'm having neck problems and bending the neck over the bench while working on things causes me a lot of pain later. Terry WB0VQP toggle quoted message Show quoted text On Sat, Mar 29, 2025 at 6:15?PM Jim Harris via <radiove1rb=[email protected]> wrote: Gary I have not had time to work on the TR7 CW issue, But I think I have it isolated the problem to the switch transistor Q1103 as with the base having?9.4 VDC on receive it still conducts some so instead of 10 volts there is a bit over 5 volts but that is enough to power up the oscillator etc. Guess I am going to have to try and put in some different transistors. It is such a simple circuit it is hard to find the problem. Jim VE1RB On Sat, Mar 29, 2025 at 3:30?PM Gary Follett via <xntrick1948=[email protected]> wrote: What ever became of the TR7 with issues on the IF/Audio board causing it to be stuck in transmit? Also, wha became of the TR-4CW that had the problem with momentarily going into CW transmit than dropping out? Also, what happened to the TR4-xxx that \had the mouse chirp on power down? It would be nice to close the loops on these. Gary W0DVN
Jim Shorney All Messages By This Member #84032 Let's make this easy. Pull the board and out it on your bench. Connect 10 volts to pin 11/38 and ground to 11/11. Make your measurements with and without the transistor on the board. Verify the pinout of your transistor against a data sheet and verify it is good with am Ohmmeter check. Where did you get your transistors? Are you confident that they are genuine? Trace the board connections to make sure the transistor is inserted correctly. On Sat, 29 Mar 2025 20:15:04 -0300 "Jim Harris via groups.io" <radiove1rb@...> wrote: Gary I have not had time to work on the TR7 CW issue, But I think I have it isolated the problem to the switch transistor Q1103 as with the base having 9.4 VDC on receive it still conducts some so instead of 10 volts there is a bit over 5 volts but that is enough to power up the oscillator etc. Guess I am going to have to try and put in some different transistors. It is such a simple circuit it is hard to find the problem. Jim VE1RB -- 73 -Jim NU0C

Previous Topic Next Topic