Michael Tope wrote:
>----- Original Message -----
>From: "Frank N. Haas" <email@example.com>
>>What is the best method to put an Alpha 78 on 17 Meters?
>>This model of Alpha normally doesn't require tuning in the conventional
>>sense on 80, 40, 20, 15 and 10 because of its broadband ("bandpass")
>>stage. However, one can switch to a conventional tuning mode, if desired.
>>Neither the conventional tuning method or the bandpass setup for 20 or 15
>>meters produces any output on 17 meters.
>The tuning is pretty sharp for 17 meters. In fact, the first time I tried
>concluded that it wouldn't work on 17 meters at all. The club I belong
>to has 2 Alpha 78's. Recently I had one over here to replace a burnt
>bandswitch. With some careful fiddling, I was able to get full output on 17
>meters. Unfortuntately, the amplifier is at the club station now, so I don't
>have the tune/load control settings chart in front of me. I believe I was
>able to get it working using the manual tune position with the bandswitch
>set to 21 MHz. Try fiddling with the tune/load controls at a low drive
>level (10 watts say). If you carefully work through the various combinations
>of tune/load, you should be able to get it to work. DON'T tuning up on 12
>meters, though. The plate choke has a resonance near that frequency and
>will likely go up in smoke if you do.
>73, Mike W4EF......................................
Yes, everything that Mike said is right. The settings for 17 Mx for my
Bandswitch on 21 MHz, Tune control 18 and Load control 75.
Good luck and 73,
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