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Re: [Amps] Automatic bandswitching

To: g3rzp@g3rzp.wanadoo.co.uk,Partain Chuck <Chuck_Partain@maxtor.com>, amps@contesting.com
Subject: Re: [Amps] Automatic bandswitching
From: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 15 Feb 2006 12:38:24 -0500
List-post: <mailto:amps@contesting.com>
Anyone remember the National MB-150 all band (except 160 and maybe 
WARC)  network?
Wonder if there is something like it for 2kW or so that matched 50ohms.

73
Bill wa4lav


At 05:48 PM 2/15/2006 +0100, Peter Chadwick wrote:
>Chuck asked:
> >what would it take to do a electronic(no moving parts) bandswitch??<
>If you're talking tubes, it's interesting. PIN diodes are available that 
>withstand 2000 volts, so for say a  pair of 3-500Z at 3000 volts, you'd 
>need at least 3 in series. But then the problem comes of the current, 
>since you'd need to handle 20 amps or so, which would eman a pretty big 
>current through the PIN.
>I would use the old fashioned Ledex, or motorise a regular switch.
>73
>Peter G3RZP
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