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Distorted Transmited Audio 20 meters & Up


 

Hi Todd,

It could be the 6146 output valves have gone soft. It's common for them to drop? output power on the higher frequencies when they do. In that case, you could be over driving them on the higher bands. Possibly worth looking at your output power when tuned up to see if it is significantly lower on 15, 12 and 10. It's normal for it to be a bit lower on the higher bands, but it should still be say 80-90% of the output on 20.

73 Gordon G8WWD?

On Wed, 15 Mar 2023, 08:36 Gordon via , <ve5uj=[email protected]> wrote:
Hi Todd! Are you using a dummy load for these tests or are you on antennas?? You know about some microphones picking up RF from antenna feedlines? I hear that commonly on 80 and 40 metres.
There are other sources of distortion within the audio stages of the FT-101 as well. You may need to trouble shoot. Keep us posted on all the symptoms!
Gord, VE5UJ



On Tuesday, March 14, 2023 at 11:24:38 a.m. CST, Todd AL7PX via <ic7461=[email protected]> wrote:


I have a problem with my 101B transmitting audio. The lower bands (80,40) audio sounds clean but 20 meters it starts to distort and gets worse further in upper bands. 10 meters is the worse. Has anyone experienced this condition or what might be causing the issue? I'm using another receiver to monitor the signal.?
Todd
AL7PX

--
Gord. VE5UJ