[TenTec] Jupiter

[Michael Melland, W9WIS]

Had the same issue with mine and worked for several days with Gary at
Ten-Tec who also had one an owner returned on his bench with the same issue.
I had redone my ground system, had line isolators all around on every
line.... no help.

What was discovered is that there is no RF bypassing on the (TX EN - TX OUT)
key lines and rf can get into the radio via that route. It travels directly
to the cpu via that route... We tried bypass caps and that didn't help....
then we each soldered in a 100 microhenry RF choke in the amp at the RCA
connectors.  That helped quite a bit but generally one high freq band still
had problems with full output.

The final solution for me was to purchase an AmpKeyer.... and use it via the
MOSFET keying relay and opto-isolator chip.  That way there is no connection
direct to the Jupiter and thus no RF travels past the AmpKeyer..... It even
worked when driving my tube amp at 1500 watts...... nothing else worked.

http://www.theheathkitshop.com/ampkeyer.html

Mike, W9WIS