-----Original Message-----
From: Jim <jdc@ieway.com>
To: Peter Chadwick <Peter_Chadwick@mitel.com>
To: <amps@contesting.com>
Date: Thursday, January 07, 1999 8:51 AM
Subject: Re: [AMPS] Plate load charts
>
>-----Original Message-----
>From: Peter Chadwick <Peter_Chadwick@mitel.com>
>To: 'amps' <amps@contesting.com>
To: <amps@contesting.com>
>Date: Thursday, January 07, 1999 9:28 AM
>Snip
>>
>>I haven't gone through the sums before, so this has been interesting. I
>>suspect that the loss in efficiency on the high bands of many amps is
>>because the switch resistance becomes a greater proportion of the series
>>resistance as the inductor gets less, while the short circuited part of
the
>>tank coil couples its resistance by transformer action back to the used
>part
>>of the coil.
>>
>>If you don't short the unused part of the coil, what are the chances by
>>Murphy's Law that the unused part resonates in at least one of the bands,
>>leading to enormous voltages and problems?
>>
>
>The Henry 2KD5 that I owned would put out over 1500 watts on 10 meters. For
>you that dont know, the henry 2kd5 and other Henry amps, use the band
switch
>to switch in "C1" caps. The "plate tune" control is a edge wound roller
>coil. There is no actual cap for "C1". Just C STRAY and C of the two
3-500Z.
>I think it is agreat design. And the tank is very efficent at this freq
>also....15 meters is done the same way. Just the stray and the cap of the 2
>tubes....
>
>I would like to see Carls input on this....
>
>73 and cul
>Jim W7RY
>
>>73
>>
>>Peter G3RZP
>>
>>
>>--
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>>
>
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