[drakelist] 2CQ or 2CN
There were 2 models of the 2C. One had a connection on the rear labeled 2CQ and the other 2CN. Is either connection for the the 2CQ? Thanks, Bill, WB9CAC
Re: [drakelist] 2CQ or 2CN
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Bill - Yes, the early units were labeled 2CN both on the schematic and the rear panel, probably up through s/n 999. Probably done by someone who was NOT there during the 2-A and 2-B models! Schematic and rear panels for s/n 1000 and up was labeled 2CQ. Wiring is identical. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Bill Ellis wrote: There were 2 models of the 2C. One had a connection on the rear labeled 2CQ and the other 2CN. Is either connection for the the 2CQ? Thanks, Bill, WB9CAC -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] 2CQ or 2CN
Gary, I purchased your best CD from you and love it. However, I have a TR-4 C that is serial number 23470, that has a different pc boad than any of your pictures. It is adjacent to the VFO jones plug toward the filter cap. It has a .02 cap along with a 100, 22K, and 330 ohm resistor. I have PTO problems with this unit. It will tune using the external VFO, but not the internal one. I made a note where all the wires go when I pulled the PTO, but have lost it so I need some sort of picture to help. Got any ideas ? Boyd W0BUW Garey Barrell [EMAIL PROTECTED] wrote: Garey Barrell made an utterance to the drakelist gang -- Bill - Yes, the early units were labeled 2CN both on the schematic and the rear panel, probably up through s/n 999. Probably done by someone who was NOT there during the 2-A and 2-B models! Schematic and rear panels for s/n 1000 and up was labeled 2CQ. Wiring is identical. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs Bill Ellis wrote: There were 2 models of the 2C. One had a connection on the rear labeled 2CQ and the other 2CN. Is either connection for the the 2CQ? Thanks, Bill, WB9CAC -- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] 2CQ or 2CN
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Boyd - Well, first of all, that's gotta be a TR-4, not a C. It would be a Version 2 model. There's always one :-) Any chance of a photo of the board? Anything else on that board except the parts you listed? I can make a guess from what you have told me so far... The Red (or White/Red) wire from the PTO should go to the terminal that also has a White/Red wire that is connected (via the harness) to R140, which is shown on Page 14. You should be able to verify that with an ohmmeter check. Also, in this version, you _should_ be able to turn on the transmitter with the PTO out and measure +150V regulated on that terminal. A cross check with the ohmmeter should read very close to 15k ohms from that terminal to the +150V bus. The White/Green wire from the PTO should connect to the terminal that goes to the 100 ohm resistor on your board. The other end of that resistor should go to the coax that goes into the harness, and is the PTO output. The White/Black wire from the PTO should connect to chassis ground, probably to a terminal on your board. There may be another wire from the PTO, I don't have a TR-4 here to check, and have no idea as to the color code. But if you have one left over, it would connect to that 22k ohm resistor. The other end of that resistor goes to Pin 2 of the RV-4 connector. I don't know much about the RV-4, but it looks like that Pin 2 is grounded or open for normal transceiver operation, and applies a positive voltage to the internal PTO to disable it and allow the RV-4 to control. My understanding is that the transceiver should operate normally with the RV-4 unplugged, which would leave that lead floating, e.g., even if that wire were not connected to the 22k resistor the transceiver should work normally without the RV-4 plugged in. Let me know!! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Boyd Van Horn wrote: Gary, I purchased your best CD from you and love it. However, I have a TR-4 C that is serial number 23470, that has a different pc boad than any of your pictures. It is adjacent to the VFO jones plug toward the filter cap. It has a .02 cap along with a 100, 22K, and 330 ohm resistor. I have PTO problems with this unit. It will tune using the external VFO, but not the internal one. I made a note where all the wires go when I pulled the PTO, but have lost it so I need some sort of picture to help. Got any ideas ? Boyd W0BUW *//* -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] 2CQ or 2CN
Garey, Thanks, It is a TR-4 not a C. I will take a couple pictures and send to you. Thanks much. Boyd Garey Barrell [EMAIL PROTECTED] wrote: Garey Barrell made an utterance to the drakelist gang -- Boyd - Well, first of all, that's gotta be a TR-4, not a C. It would be a Version 2 model. There's always one :-) Any chance of a photo of the board? Anything else on that board except the parts you listed? I can make a guess from what you have told me so far... The Red (or White/Red) wire from the PTO should go to the terminal that also has a White/Red wire that is connected (via the harness) to R140, which is shown on Page 14. You should be able to verify that with an ohmmeter check. Also, in this version, you _should_ be able to turn on the transmitter with the PTO out and measure +150V regulated on that terminal. A cross check with the ohmmeter should read very close to 15k ohms from that terminal to the +150V bus. The White/Green wire from the PTO should connect to the terminal that goes to the 100 ohm resistor on your board. The other end of that resistor should go to the coax that goes into the harness, and is the PTO output. The White/Black wire from the PTO should connect to chassis ground, probably to a terminal on your board. There may be another wire from the PTO, I don't have a TR-4 here to check, and have no idea as to the color code. But if you have one left over, it would connect to that 22k ohm resistor. The other end of that resistor goes to Pin 2 of the RV-4 connector. I don't know much about the RV-4, but it looks like that Pin 2 is grounded or open for normal transceiver operation, and applies a positive voltage to the internal PTO to disable it and allow the RV-4 to control. My understanding is that the transceiver should operate normally with the RV-4 unplugged, which would leave that lead floating, e.g., even if that wire were not connected to the 22k resistor the transceiver should work normally without the RV-4 plugged in. Let me know!! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs Boyd Van Horn wrote: Gary, I purchased your best CD from you and love it. However, I have a TR-4 C that is serial number 23470, that has a different pc boad than any of your pictures. It is adjacent to the VFO jones plug toward the filter cap. It has a .02 cap along with a 100, 22K, and 330 ohm resistor. I have PTO problems with this unit. It will tune using the external VFO, but not the internal one. I made a note where all the wires go when I pulled the PTO, but have lost it so I need some sort of picture to help. Got any ideas ? Boyd W0BUW *//* -- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] TR-4 PTO Problem
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Boyd - OK. I believe that white/red wire flying is connected at the other end to R140, the 15k, 7W dropping resistor. You can verify that with an ohmmeter check. If you check, I bet you'll measure +150VDC regulated on that wire with it disconnected like that. This is the current source that drives the PTO and its internal 10V Zener. There's probably an empty tag on that small board where it can be tied to the white/red wire coming from the PTO, and nothing else. The center conductor of the coax should be connected to one end of a 100 ohm resistor, and the white/green wire from the PTO goes to the terminal on the other end of the resistor. The terminal at the center-bottom of the board is ground, and the white/black wire from the PTO connects there. IF the white/blue wire connected to the board is one end of a 22k resistor, AND there is a fourth wire (color unknown) coming out of the PTO, that wire connects to the other end of the 22k resistor. Garey - K4OAH Boyd Van Horn wrote: Garey, Here are a couple pictures of the TR-4 I am asking about. Boyd W0BUW */Garey Barrell [EMAIL PROTECTED]/* wrote: Garey Barrell made an utterance to the drakelist gang -- Boyd - Well, first of all, that's gotta be a TR-4, not a C. It would be a Version 2 model. There's always one :-) Any chance of a photo of the board? Anything else on that board except the parts you listed? I can make a guess from what you have told me so far... The Red (or White/Red) wire from the PTO should go to the terminal that also has a White/Red wire that is connected (via the harness) to R140, which is shown on Page 14. You should be able to verify that with an ohmmeter check. Also, in this version, you _should_ be able to turn on the transmitter with the PTO out and measure +150V regulated on that terminal. A cross check with the ohmmeter should read very close to 15k ohms from that terminal to the +150V bus. The White/Green wire from the PTO should connect to the terminal that goes to the 100 ohm resistor on your board. The other end of that resistor should go to the coax that goes into the harness, and is the PTO output. The White/Black wire from the PTO should connect to chassis ground, probably to a terminal on your board. There may be another wire from the PTO, I don't have a TR-4 here to check, and have no idea as to the color code. But if you have one left over, it would connect to that 22k ohm resistor. The other end of that resistor goes to Pin 2 of the RV-4 connector. I don't know much about the RV-4, but it looks like that Pin 2 is grounded or open for normal transceiver operation, and applies a positive voltage to the internal PTO to disable it and allow the RV-4 to control. My understanding is that the transceiver should operate normally with the RV-4 unplugged, which would leave that lead floating, e.g., even if that wire were not connected to the 22k resistor the transceiver should work normally without the RV-4 plugged in. Let me know!! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs Boyd Van Horn wrote: Gary, I purchased your best CD from you and love it. However, I have a TR-4 C that is serial number 23470, that has a different pc boad than any of your pictures. It is adjacent to the VFO jones plug toward the filter cap. It has a .02 cap along with a 100, 22K, and 330 ohm resistor. I have PTO problems with this unit. It will tune using the external VFO, but not the internal one. I made a note where all the wires go when I pulled the PTO, but have lost it so I need some sort of picture to help. Got any ideas ? Boyd W0BUW *//* -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
