Marconi RC782 TX
 

I'm after a service manual / circuit diagram for a Marconi RC782 TX.

I've got one here that's a PA and I want to get it running on 2m. I've got
it doing about 45W on 2m, but there's a lot of second harmonic coming out
(10W), and me playing about isn't doing much to kill it off, so I need to
look at a circuit to try to work it all out.


Can anyone help?

Sam

I've got one here that's a PA and I want to get it running on 2m. I've got
it doing about 45W on 2m, but there's a lot of second harmonic coming out
(10W), and me playing about isn't doing much to kill it off, so I need to
look at a circuit to try to work it all out.


Can anyone help?

Sam
If it's a push pull stage, you have one transistor not doing it's job.
Should have 30-40 dB of second harmonic suppression just due to symmetry.

W4ZCB