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Messages - Sam Smith

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Military Radios / Re: PRC320 - RT320 RECEPTION PROBLEM
« on: December 13, 2018, 01:44:22 PM »
Your English is very understandable-No problem here! Sounds like the PTT Relay circuit may have issues. Do you have any schematics of this radio? If you are handy with a soldering iron you might want to heat it up-First, check with an ohm meter to see if you have any opens / shorts that should not be there and carefully remove shorts or poor solder joints which may look open or which reads higher than it should.

Take note of any burnt smells or signs of circuit damage.

You may want to clean the inside circuits with alcohol or a mild detergent soap - don't use anything with Bleach if the chassis is aluminium as it may react and damage your radio. (Use your judgement or test with a cotton swab first)

Check the wiring to see if that circuit may have an open in it or if that wire needs replacing.

Also, check to see if any switches may be dirty or damaged (Ceramic switches can be damaged if the radio has been dropped - especially on the shaft or the knob(s).

In your search a good visual inspection of the radio (inside and out) might provide some answers.

In summary:

1) Visually inspect the radio; any apparent damage? Cracked knobs or panels?

2) Take the whiff test and check for burnt smells.

3) Clean the inside with alcohol and or mild detergent soap - make sure you rinse with water or alcohol and get any trash out. Also, check for burnt traces or wires.

Trouble shoot using the schematic but use the rule of thumb that says: "If it ain't broke - don't fix it!"

ZERO the ohm-meter before you use it to avoid erroneous conclusions! Been there! Done that!

Ask for advise from hams who have experience with this or similar radios (This is a great place to start!)

Lastly, share your findings with us here - I know I'd like that - others might too!

Best wishes to you friend - 73!

 

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