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TX 125 AMP
- Thread starter Steve Hurst
- Start date
If the color bands are burnt you can't tell what they were. Need more pictures of the amp.
Does the amp put out power, any leds lit? Does the radio receive and work?
It works yes. Transmits on all settings but max. Shows about 80 watts. Receive amp light comes on but the receive goes down when on. When you use the max amp setting it seems to oscillate till you turn it off max. Used it once to get a report and it was heard and had improved signal. What more pic can I give?
This one is a real oddball. I have seen circuits in the Motorola handbooks, labeled as "test" circuits that use open coils and capacitors like this for matching impedances.
But every example of a two-transistor push-pull circuit that comes to mind uses broadband ferrite transformers.
This one does not.
Is there a name, or any kind of logo on the front panel. My records don't seem to contain a "TX-125" of any kind.
The two burned resistors reveal no hints about what they do. The one on the right-rear has a first numeral of "1", the brown band that's not burned. Leaves two more color bands to guess.
The one on the left started with the digits "47". The yellow first band is followed by a barely-visible trace of a violet band. But the third one is long gone. Can't see just what it does in the circuit, so could it be a zero point 47 ohm? or a four point seven? or forty seven? Or a 470? No hints from where it's connected that I see to narrow this down.
73
But every example of a two-transistor push-pull circuit that comes to mind uses broadband ferrite transformers.
This one does not.
Is there a name, or any kind of logo on the front panel. My records don't seem to contain a "TX-125" of any kind.
The two burned resistors reveal no hints about what they do. The one on the right-rear has a first numeral of "1", the brown band that's not burned. Leaves two more color bands to guess.
The one on the left started with the digits "47". The yellow first band is followed by a barely-visible trace of a violet band. But the third one is long gone. Can't see just what it does in the circuit, so could it be a zero point 47 ohm? or a four point seven? or forty seven? Or a 470? No hints from where it's connected that I see to narrow this down.
73
I'm guessing here, but I think those small resistors are in the receiving boost circuits. Those receive boost circuits don't really help because they amplify noise with along your desired signal. Not selective at all. Get me more pictures of the circuit board so I can look for a trimmer cap in the RF power circuits.
I know the pre amp is not important but if you could have a guess I would be happy. In case I sell it. Not that I will. Thanks for the help
Well i am trashing it, well it will be used for parts the good ones at least. Thanks every one for the replies and help
It is not worth using. SSB doesn't work I found that out last night when I tried to use it. I don't want anything that is hooked to it to have trouble. It is ok I got a cobra 148 gtl in the deal and it works after a little work. I just need my freak counter so I can line it up and use it.