Question about Radio Communications
Found a mint TRC-458 in box - Cleaned out the control & pots. Powers up nice on AC / DC power : Bright display, all functions works , no scratching no dust inside. Clean. Received 100% Transmits AM : NO power seen on S-Meter nor a Watt Meter connected to a 50 Ohm load? USB , same thing , except on LSB it works with about 8 watts PEP seen .. OK, where did I go wrong here ?? Any ideas when I should look, I have some test equipment here to help.. Thanks
This uses a uniden board and has a relay for transmitting, check and clean the relay contacts
Posted on Jun 10, 2013
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Posted on Jan 02, 2017
there a several things you can check yourself with a minimum of tools or test equipment. this model has been around for several years and voice coils do expire in the internal speakers as they age. attempt to locate a known good external speaker with a 3.5 mm plug and see if the receiver can be heard through it. if so then the internal speaker has seen better days and the solution/s should be obvious. also in this particular model the receiver output is controlled by the microphone switching and an open receive line in the mic cord/cable or the plug itself would render the receiver unhearable. check with another known good microphone wired for realistic radios (5 pin DIN). the microphone might also have been rewired improperly. make sure the squelch is in the fully counter-clockwise position and the volume is adjusted to a suitable level while testing, 12 o'clock or higher.
Posted on Jun 10, 2009
SOURCE: Have a Magnum 257HP 10 meter radio. While connected to a 50 ohm dummy load, and a power meter, noticed that the USB and LSB would not modulate when a voice input is placed into the microphone. Also
You may have a radio where the AM limiter has been defeated which can cause all kinds of issues. I would first check the mic is wired right and does not have a problem, the radio should have output with a tone to it on sideband--wattage up to over 20 watts on SSB is normal.
Posted on Dec 12, 2012
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