Kenneth and others,
I'm not for sure on this but I think Rich was refering to the SB-220 plate
choke. I almost got it confused myself whether he was speaking of the Alpha or
the Heath. One can test the choke with a dip meter to find where it's self
resonance is though before they try a band like 12 meters.
Best,
Will
*********** REPLY SEPARATOR ***********
On 9/27/05 at 1:19 PM Kenneth D. Grimm, K4XL wrote:
>R.Measures wrote:
>
>>On Sep 27, 2005, at 7:04 AM, Michael Tope wrote:
>>
>>
>>
>>><snip>I did read where 24 MHz is not recommended because
>>>of a HV plate choke resonance issue at 25 MHz.
>>>
>>>
>>
>>The lowest resonance in the 50uH HV RFC is c. 43MHz.
>>
>>
>Are you saying that the plate choke isn't going to fail if the amp is
>loaded up on 24 MHz? Shouldn't one heed the warning given on the Alpha
>Radio Products web site which says: "The ALPHA PA-77, 77Dx/Sx, 78, 76,
>76A, 374 and 374A should not be used on 12m.
><http://www.alpharadioproducts.com/html/warc_78_12m.htm> The plate choke
>will overheat and burn on that band."
>
>--
>
>Ken K4XL
>k4xl@arrl.net
>
>*** BoatAnchor Manual Archive ***
>On the web at http://bama.sbc.edu and http://bama.edebris.com
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>
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