TRC-473 sounds like I’m in a tube on transmit…

[Retroradio]

My TRC-453 has been reported by the locals and I monitored it myself and it sounds like am speaking through a long tube.
Have tried several stock and a couple power mikes With the same result.
Any ideas on how to remedy this rather weird issue?

 

[N1EXA]

Sounds like your bandwidth in the audio section has been touched by the golden screwdriver.

Could be the radio is a bit old and needs to go to the shop ! Things get out of Alignment expecially if its been shelved or sits in a car

thats real hot and real cold over the years.

Your going to need a schematic of the radio and find the audio section were it mixes into the transmitt frequency

Realisitic TRC453 Service Manual

and adjust at that point to broaden out the audio off the microphone. Changing microphones is not going to get you anything.

My question is - SSB or AM this problem exists ?

Here is the 473 Manual because your title and whats in your question are different model numbers ?

RADIO SHACK REALISTIC TRC-473 OWNER'S MANUAL Pdf Download

View and Download Radio Shack Realistic TRC-473 owner's manual online. CB 40-channel Mobile Transceiver. Realistic TRC-473 radio pdf manual download. Also for: 21-1537.

www.manualslib.com

Pete N1EXA

 

[Retroradio]

It was an internet buy so the history is unknown.
Its an AM rig so AM.

thanks for the link 😀

 

[prcguy]

I've never heard of an adjustment at a mixer that would broaden out the audio response on transmit. Instead the final transistor B+ line is modulated with audio from the same audio amp that feeds the speaker on receive via a tap on the audio output transformer that feeds the speaker. These radios are about 36yrs old and there is a good chance coupling caps in the audio stages have changed value (lower) and are rolling off bass response. Welcome to the equivalent of an old radio grandpa and all his ailments.

Sounds like your bandwidth in the audio section has been touched by the golden screwdriver.

Could be the radio is a bit old and needs to go to the shop ! Things get out of Alignment expecially if its been shelved or sits in a car

thats real hot and real cold over the years.

Your going to need a schematic of the radio and find the audio section were it mixes into the transmitt frequency

Realisitic TRC453 Service Manual

and adjust at that point to broaden out the audio off the microphone. Changing microphones is not going to get you anything.

My question is - SSB or AM this problem exists ?

Here is the 473 Manual because your title and whats in your question are different model numbers ?

RADIO SHACK REALISTIC TRC-473 OWNER'S MANUAL Pdf Download

View and Download Radio Shack Realistic TRC-473 owner's manual online. CB 40-channel Mobile Transceiver. Realistic TRC-473 radio pdf manual download. Also for: 21-1537.

www.manualslib.com

Pete N1EXA