I ended up with two TRC-458s in a trade. One worked and the other had been hacked on pretty bad, probably be good for parts. Knowing they both have original caps, I rolled the dice and started using the one that works. A few days in I heard a bit of a hum and figured it was outside interference but in hindsight I believe it was the big cap in the power supply going out.
Anyway, I was talking to a friend and when i unkeyed he said he had lost my signal. I went ahead and recapped it (thanks Klondike Mike) and replaced the few random tantalums also. The proper values are all installed correctly and polarity is verified. It didn't fix the issue nor did i expect it to, I just wanted to make sure the caps were sorted before trying to find the issue.
I have excellent receive on am/ssb but zero transmit on either. The meter doesn't move on ssb when I key up and speak. On am key up the meter just barely moves and doesn't change when speaking. For what it's worth the meter does work fine on receive. I swapped relays temporarily, made no difference, contacts look fine on both also. The same antenna and coax works fine on a different radio. I only have a multimeter and a nanovna and very little knowledge of radio circuits. I'd really appreciate any guidance on bringing this back to life. Thanks
Anyway, I was talking to a friend and when i unkeyed he said he had lost my signal. I went ahead and recapped it (thanks Klondike Mike) and replaced the few random tantalums also. The proper values are all installed correctly and polarity is verified. It didn't fix the issue nor did i expect it to, I just wanted to make sure the caps were sorted before trying to find the issue.
I have excellent receive on am/ssb but zero transmit on either. The meter doesn't move on ssb when I key up and speak. On am key up the meter just barely moves and doesn't change when speaking. For what it's worth the meter does work fine on receive. I swapped relays temporarily, made no difference, contacts look fine on both also. The same antenna and coax works fine on a different radio. I only have a multimeter and a nanovna and very little knowledge of radio circuits. I'd really appreciate any guidance on bringing this back to life. Thanks
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