Phil Clements wrote:
>
>> >I believe I've read on here before where some owners have built MONO band
>> amps but powered them all from a single power supply. So, one power
>> supply deck and TWO RF decks. It has been suggested that I use vacuum
>> relays to switch between the two RF decks. I was hoping to have them both
>> run in standby at the same time. I obviously do not know enough and am
>> therefore here seeking guidance. I will only operate one amp at a time.
>
>Frank Donovan, W3LPL is probably the world's best source of info on
>this type of lash-up. His multi-multi contest station, as I recall, had
>amps for each band, with only one power supply. It may still be in
>operation.
>
>No, you don't need any relays to switch HV; just excite the amp you
>want to use. I would highly recommend HV glitch resistors in each RF
>deck, and also in the power supply.
>
A separate resistor in each amp would reduce interaction and voltage
drop, but a resistor is needed in the power supply as well, to handle
the situation where one of the B+ leads shorts to ground.
Each amp also needs its own separate anode and grid current metering. A
Triode Boards customer is looking at this right now, and I think I've
second-guessed how Frank must have done it, with isolating diodes in the
B-minus return.
--
73 from Ian G/GM3SEK
http://www.ifwtech.co.uk/g3sek
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