[Amps] Ameritron al80a

[Bob Maser]

To make sure that you don't have any plate choke resonances close to any of 
the ham bands you should sweep it with a grid dip oscillator and not just 
remove a few turns.

Bob W6TR
----- Original Message ----- 
From: "jeremy-ca" <km1h at jeremy.mv.com>
To: "Vic K2VCO" <vic at rakefet.com>; "Wayne Smith" <vo1ta.wayne at yahoo.ca>
Cc: <amps at contesting.com>
Sent: Monday, March 17, 2008 8:24 AM
Subject: Re: [Amps] Ameritron al80a


> Unwind about 4 turns and youve moved the resonance.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: "Vic K2VCO" <vic at rakefet.com>
> To: "Wayne Smith" <vo1ta.wayne at yahoo.ca>
> Cc: <amps at contesting.com>
> Sent: Monday, March 17, 2008 1:30 AM
> Subject: Re: [Amps] Ameritron al80a
>
>
>> Wayne Smith wrote:
>>> I burned up the top of the plate choke on my al80a trying to load up
>>> on 17m.Still loads up on the other bands. I am wondering if I could
>>> replace it with the plate choke from the al80b which is available
>>> from Ameritron. I suspect that they are the same.
>>
>> The AL80B choke is designed to move the series resonance away from 17m.
>> It should work and avoid this problem. It wouldn't hurt to check it in
>> place with a grid dip meter, if you have one available. Temporarily
>> connect a direct short across it (amplifier turned off, of course) and
>> any resonance should be at least 1 mHz away from the ham bands.
>> -- 
>> 73,
>> Vic, K2VCO
>> Fresno CA
>> http://www.qsl.net/k2vco
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