In the Kenwood ts-120/130 this is caused by the RF board mounting screws
being loose. Try tightening the PC board mounting screws.
The PA tube control grid bias on the FT-101Ex ought to be at least -100
volts when on receive. Screen voltage not above 250 volts positive.
Plate current should be zero and there should be no plate color.
A loose coax connecter, either the coax end or the chassis end can also
cause PA sections to oscillate.
73, Jerry, K0CQ
--
FAQ on WWW: http://www.qsl.net/k7on/yaesu.html
Submissions: yaesu@contesting.com
Administrative requests: yaesu-REQUEST@contesting.com
Problems: owner-yaesu@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|