25 watt FM transmitter.

[Rich4077]

I have a 1-25 watt FM transmitter. I had it putting out 25 watts. Then one day I can't get more than 1.5 watts output. Tested with a dummy load. 1.5 watts output. Why? Antenna? Bad circuit in transmitter? Thanks.

 

[Nigel Goodwin]

You've probably blown the output transistor?.

 

[ZipZapOuch]

I have a 1-25 watt FM transmitter. I had it putting out 25 watts. Then one day I can't get more than 1.5 watts output. Tested with a dummy load. 1.5 watts output. Why? Antenna? Bad circuit in transmitter? Thanks.

Which transistor does it use?

 

[Lightium]

How is the power selectable? What power transistor?

 

[ahsrabrifat]

Check the capacitors, coils, and solder joints for damage.

 

[danadak]

I have a 1-25 watt FM transmitter. I had it putting out 25 watts. Then one day I can't get more than 1.5 watts output. Tested with a dummy load. 1.5 watts output. Why? Antenna? Bad circuit in transmitter? Thanks.

A much more productive way to enable forum to help is information, such as post a schematic,
and even a well focused pic of board.

 

[Externet]

Measure/probe its power supply source and output. Is it a marine VHF tranceiver ?

 

[DerStrom8]

Try transmitting into a dummy load through a wattmeter to eliminate the antenna as a possible failure. Unfortunately, the power amplifier sections of these smaller radios tend to be undersized and are often the main point of failure.

 

[MrAl]

I have a 1-25 watt FM transmitter. I had it putting out 25 watts. Then one day I can't get more than 1.5 watts output. Tested with a dummy load. 1.5 watts output. Why? Antenna? Bad circuit in transmitter? Thanks.

Simple question: How are you measuring the output power?