[Central-Electronics] 20A ten meter issue. C81 as a suspect?

[Stan McIntosh]

Jim,

First, thank you for your response.  I do appreciate it.

>>I don't think a 20a on 10m put out more than a few watts under the best
of conditions.

If I'd have gotten even a watt, I think I would have just nodded and
figured any more might be too much to expect with frequency roll-off.  I
wasn't even getting 100 mW, though, which has me suspecting that I have
more work to do.

73
Stan


On Thu, Jul 13, 2017 at 4:19 PM, Jim Candela <jcandela0628 at gmail.com> wrote:

> Stan,
>
>    Realize that you are trying to make two stages of linear amplifiers
> behave as a frequency multiplier! Normally for 10m, the VFO is set to
> output a 37 Mhz signal that beats against 9 Mhz...37-9=28. I don't think a
> 20a on 10m put out more than a few watts under the best of conditions.
>
> Jim
> Wd5JKO
>
> On Thu, Jul 13, 2017 at 5:42 AM, Stan McIntosh <mcinsand at gmail.com> wrote:
>
>> Hello all,
>>
>> While playing with crystals and outputs, I could only get a tiny signal
>> out
>> on 10 meters, and we're talking well below a watt.  Although I wondered if
>> using the 4th harmonic of 40 meters might be taking things too far, I
>> started looking at C81.  Output increases with turning the screw clockwise
>> (to still well under a watt) without going through a peak.  If these are
>> compression trimmers, could they be subject to silver-mica disease, so the
>> effective maximum capacitance is not what it used to be?
>>
>> Any other thoughts?
>>
>> Regards,
>> Stan
>> KD4BTH
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