[Amps] Use of Manual T/R Switches

[Bill Fuqua]

1 KW DC plate input power AM at 100% plate modulation amounts to about 3KW 
PEP output assuming 75% efficiency.

73
Bill wa4lav

At 11:36 AM 3/6/2003 -1000, Merv Schweigert wrote:


> > There were quite a few 'Electronic T/R switches' available in the late
> > 50's and early 60's, the most 'famous' of which was the B&W T/R switch.
>
>Maybe more famous was the Johnson model..  and it was good for 1 KW
>AM service.  Had some problems with "suckout" that could be cured to
>some extent by the length of coax between the amp and the the switch.
>Also used one coupled directly to the amp plate circuit with a very small
>high voltage cap.
>For some reason dont miss those so called "good ole" days.  Smell of
>released electrons was not all that pleasant.
>Merv K9FD/KH6
>
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