On May 27, 2006, at 6:12 AM, Peter Voelpel wrote:
>
>
> -----Original Message-----
> From: R L Measures [mailto:r@somis.org]
>
>>> Again, if I drive a 8171 to not more then 1,5KW output ever,
>>> it should be tuned for that power, not for 20KW
>
>> However, if an 8171 is tuned for max suds in AB1, it is easy to back
>> the mic. gain down to the point where it produces 1500w in Class A --
>> resulting in superb linearity. In the event that more power is
>> needed to communicate, one merely advances the mic. gain. In the
>> event that 1500w is too much, one can run barefoot or turn down the
>> mic. gain even more.
>
> Very true.
>
> However, if the design goal is a clean signal in class A at 1500W
> output
> only and never more, it would be a silly idea to use parts
> sufficient for
> 20KW out, like large capacitors, coils, and power supply items, 1
> 5/8 EIA
> antenna connectors, cables and relays etc. just to tune it up at
> 20KW and
> then turn drive down via mice gain to 1500W.
> It would be a far better idea to design it for 24h/year RTTY at
> 1,5KW and
> use the TRX at medium output for best linearity, preferable in
> class A as
> well.
If this is done, one can not increase power as much. I Have seen
many instances where a 1500W signal gets buried by a group of
dedicated sociopaths.
>
> 73
> Peter
>
>
>
>
>
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R L MEASURES, AG6K. 805-386-3734
r@somis.org
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