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?
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Trc 449 no transmit
- Thread starter Staybolt
- Start date
Don't key it in SSB mode until C179 is at least removed. Leaving it out won't cripple the radio. Leaving it in might.
Once it's out, see if you have any SSB transmit. If only AM is dead, that's a major diagnostic clue.
73
Once it's out, see if you have any SSB transmit. If only AM is dead, that's a major diagnostic clue.
73
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.
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 ! ! ! !
You will RUIN it, and they are unobtainium.
Use a burnishing tool ONLY.
And DO NOT LOSE the small spring on the relay either ! ! ! !
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?
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?