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Trc 449 no transmit

Staybolt

Well-Known Member
Mar 20, 2013
828
360
93
Got a decent looking trc 449 but no transmit at all. I replaced the relay with one from a working radio, and nothing not even a peep. Tried another mic, nothing. I manually keyed the relay and it does put out power on am so finals are good. It acts like an issue between the mic and keying circuit. Anybody got any ideas?
 

kopcicle

Sr. Member
Feb 17, 2016
2,079
3,335
273
C179 . then bias. Then AM power (4watts) then SSB (14-16watts)
Follow alignment per manual.
If you don't have the manual, ask. I know many of us have it. If not the TRC-449 from cbtricks works.
 
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sonoma

Sr. Member
Sep 14, 2005
2,105
937
123
oklahoma
try checking parts around the relay. some I have had a problem with causing problems. R111, D24, C103, D28, R112 which is a 1 watt resister. I have had some of these short causing problems. even some on the right side of the relay also. the parts I listed are on the front side of the relay.
 

sonoma

Sr. Member
Sep 14, 2005
2,105
937
123
oklahoma
does the relay key when you push the mic key. at least that is what I am getting is the relay does not switch when the mic is keyed.
 

Robb

Yup
Dec 18, 2008
11,433
3,611
323
Silicon Valley CA, Storm Lake IA
If the problem is the relay itself; then DO NOT FILE the contact points in the relay ! ! !
You will RUIN it, and they are unobtainium.
Use a burnishing tool ONLY.
And DO NOT LOSE the small spring on the relay either ! ! ! !
 

TM86

Supporting Member
Jul 6, 2014
1,117
1,518
173
Payson, AZ
Dumb suggestions, but that's my specialty:

Checked that all your voltages are there?

Checked the setting of, and connections to, the CB/PA/MON switch?

Checked continuity from the mic connector pin 3 through to the relay?
 

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