All -
I have made a mod to my Alpha 77 to add about 60 uH to the RF plate choke
when on 160 meters. I originally was going to mount a switch to control a
HV relay - but came up with a better solution. If you are interested in
knowing more - check out the pictures here:
http://www.kkn.net/n6tr/directories.html
Look under Alpha 77Dx. The relay was purchased from Henry Radio. It has a
26.5 volt coil which seems to work just fine off of the +24 volt regulated
power in the amp.
I added a 4700 pf 6KV cap from the HV to ground which you can see in the
pictures.
I am not sure this makes a big difference - but I certainly feel better
about using the amp on 160 with this mod.
73 Tree N6TR
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|