To make it clear, I've never tried this so I'm not speaking from personal
experience.
But it seems logical to me that if a vacuum relay is required for the voltages
and duty involved, then a bandswitch is out of the question as well, isn't it?
My thought is that, putting aside questions around stray-L that might arise
from the insertion of a relay, it's easier to find a relay with sufficient
contact spacing than it is to find a bandswitch with a large enough diameter to
maintain the same spacing between contact elements.
I guess these sorts of problems is why it's called engineering and not science!
Al
AB2ZY
-----Original Message-----
From: MU 4CX250B [mailto:4cx250b@miamioh.edu]
Sent: Sunday, January 19, 2014 9:32 AM
To: Al Kozakiewicz
Cc: amps@contesting.com
Subject: Re: [Amps] Building an Amp 101
Relays are certainly a possibility, Al, but for a nine band amplifier things
get a bit complicated. My latest project ( 90% completed) is a duo - band
80m/160m amplifier with a pi- L tank circuit, and for that I am using two DPDT
vacuum relays, each of which cost over $100.
Scaling that up to a nine band amplifier doesn't seem very practical or
cost-effective.
73,
Jim w8zr
Sent from my iPhone
> On Jan 18, 2014, at 8:52 AM, Al Kozakiewicz <akozak@hourglass.com> wrote:
>
> Why not use relays appropriate for the switching duty? Then the bandswitch
> can be just about anything or even remotely controlled. Plus you can locate
> the switch where it's convenient to operate instead of being constrained by
> the necessity to place it close to the RF components.
>
> Al
> AB2ZY
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