[Amps] Sharing 15 and 10M on a single band switch position?

[David Feldman]

Ceramic/porcelain, contacts are about 3-4mm diameter each.

Is the likely problem excess RF current through the contacts on 15M at maximum output due to insufficient inductive reactance on 15M? What about designing the tank for 15M then using it on 10M? What about derating the RF deck on 15M? I don't need full output on 15M or 10M, just exploring options to make use of my 5-position switch and get some usability on the two bands...

Dave




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On Wed, Mar 28, 2012 8:10 AM MDT Carl wrote:

>Besides possibly blowing the switch?  Not much.
>
>It will have the same messed up Q that takes out the 15M contacts on several amps when trying to run full bore on 17.
>
>What sort of switch will you be using?
>
>Carl
>KM1H
>
>
>
>
>----- Original Message ----- From: "David Feldman" <wb0gaz at yahoo.com>
>To: <amps at contesting.com>
>Sent: Wednesday, March 28, 2012 9:32 AM
>Subject: [Amps] Sharing 15 and 10M on a single band switch position?
>
>
>> 
>> My emerging project amp (a reconstituted Alpha 76A that is missing it's tank circuit) would normally require a 6-position band switch, but the switches I have (one and a spare) are 5-position. I'm thinking of designing the tank circuit to share 15 and 10M on one switch position, by having the PI network designed for around 24 MHz, on the theory I could use it on 21 and 28 MHz. I don't plan operate 24 MHz itself with the amp. Losing a bit of efficiency on 21 or 28 MHz isn't a concern. Anything else I should be concerned with?
>> 
>> Thanks,
>> 
>> 73 Dave WB0GAZ wb0gaz at yahoo.com
>> 
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>