[Amps] Tuned input board on SB-220

[Gary Schafer]

There was some discussion on this board awhile back and wasn't it decided
that the tuner is actually an L network and not a PI? That would make it
unsuitable as a tuned input network.

73
Gary  K4FMX


> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of noddie
> Sent: Wednesday, March 22, 2006 10:10 PM
> To: 'Ed Dial'; amps at contesting.com
> Subject: Re: [Amps] Tuned input board on SB-220
> 
> 
> The AT-100AMP is what I am going to use on my SB-221, I wish it had been
> around when I build a tuned input board for my Clippertron L, all the
> other
> tuned input boards do not work on the WARC bands and cost 150 dollars
> compared to 125 dollars for the AT-100AMP and this board is automatic with
> memories.  The only thing you will have to watch out for is that your RF
> choke does not resonate on the WARC bands.  I changed my choke to the RF
> Parts one at a cost of 25 bucks, it works for 3-500's and 572b's and will
> not resonate on the WARC bands.
> 
> Mike
> 
> 
> Gentlemen,
> 
> I need opinions from the experts that live here. I have an SB-220
> that does an excellent job on the pre-WARC bands, however it doesn't
> like 12 and 17 meters very well, thanks to the tuned input circuit
> from what I understand. I noticed that the good folks at LDG
> Electronics is now selling a stripped version of their AT-100
> autotuner as the AT-100AMP, marketed as an RF amplifier tuned input
> board for homebrews and the like. My question is, could this board be
> fitted into the SB-220 without much pain? Would this solve the WARC
> problem?
> 
> If so, would it work in the SB-200 as well? I have no clue with 572s.
> 
> Lazy and looking for the simple way out -
> 
> Ed
> WA4RYW
> 
> 
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