开云体育

Dave, It sounds as if you are making some progress. Did you read the manual on how the 1.4 MHz signal is generated? If you are in AM Rx it seems that the 1.4 MHz signal is muted (see Part 3 page 2-9),

Richard, Thank you very much for this info and making it available. I have a TRA-931 that I am trying to repair although I feel like it is somewhat above my ability. The availability of the manual was

Folks, just to clarify the point below about the manuals on the vmars website.?? These are still free for anyone to access, without a password, membership or anything else.??? I was the first

More pictures.

Hello there John, Thank you for your time and reply. You seem like a wealth of information. I will try to comment within your response.

Hi Dave, Its been a while since I worked on TRA931’s like well over40 years ago now, but I do own several TRA931’s and have had to maintain themfrom time to time. The TRA931 was probably Racal’s

Radio works fine. Hams comment the audio sounds very processed and I explained there is a built in clipper circuit. Is the microphone element a carbon element? Can someone tell me what the front panel

Hello John, Dave here KC3AM and I am asking for some help. From your comments above maybe you can help me some with my TRA931 that I got from a friend who is now a SK. Not knowing anything about this

Does anyone have a good photo or two of MA927 please. Also, can someone give me an estimated cost for one of these, and a Syncal 30 with auto tuner option please? Thank you Andy, G7BAV

Hello everyone. I have a TRA931 from a long time friend that is now a SK. Does anyone repair them. This seems to be a bit above what I feel comfortable with. I powered up with 23 VDC, was receiving

Hi Peter, Glad to help. Tom

Tom: At lunch time, I added a diode pull down of the bias of my amp to the PTT line, just like that in the schematics you posted. Works great. Now to redo the bread board, and stuff it into a small

Tom thank you! I didn't notice the attachment so i went ahead and made a simple 3 tr 1W amp. Got terrible issues with RF getting into my audio amp. By passing the audio input side didn't help and also

Thanks I got it eventually. Also found a YouTube video in Indonesian: https://www.youtube.com/watch?v=sU8t1wHWAjU&t=180s

Dennis: thanks for the guidance. I reconfigured my 2 parallel 24 series NimH pack into two strings of 10 cells//2 parallel(HR-4/3FAU? 4500mAH x 2).

You'll need 20 cells to power it. I use 2x 10cell packs of 5ah 'C' cells. They are also used to power other packsets around here at 12 or 24vc. Dennis Starks Military-Radio-Guy KB?SFP

I have the Syncal 30 "aging" right now. Powered up and idling in receiver. I plan to cobble together a battery pack. The radio supposedly has a wide input power supply tolerance. In consideration of

hello...the wiring on the manual is clear . you only need to match the pin number on the board and to the other board. on schematic is clear how to connect pa board and lhe LPF board. the the tricky

I took a second look again. I took the main relay out and checked each of the 4 SPDT sections. 1 of the 4 SPDT sections was not functioning correctly. The center contact was moving and breaking the

Georg, John, et al: Sorry for my slowness, I had too many projects running in parallel. When I was getting ready to start looking at the TRA931, my scope died. Its from 1989. All the caps on the CPU