[Amps] Tuned input board on SB-220

[Gary Schafer]

Yes you are right they do "both matter" but my point was that with the high
Q output tank circuit of the amp it is going to clean up the waveform pretty
well to where I don't think you would see any difference in the output
waveform whether the input is tuned or not. After all look what it does for
the class B waveform! Now if you were to look for 3rd and 5th order output
products that's a different story.

Looking at the cathode input of the amp with and without a tuned circuit is
where you will see the difference in waveform with a scope.


73
Gary  K4FMX

> -----Original Message-----
> From: k7rdx [mailto:k7rdx at charter.net]
> Sent: Thursday, March 23, 2006 12:26 PM
> To: garyschafer at comcast.net
> Subject: Re: [Amps] Tuned input board on SB-220
> 
> They BOTH matter if you want to keep the peace with your neighborsAND
> fellow
> hams...We all know if you put junk in it`s junk out...Jim..
> ----- Original Message -----
> From: "Gary Schafer" <garyschafer at comcast.net>
> To: "'k7rdx'" <k7rdx at charter.net>; "'noddie'" <noddie at comcast.net>; "'Ed
> Dial'" <diale at mindspring.com>; <amps at contesting.com>
> Sent: Thursday, March 23, 2006 8:33 AM
> Subject: RE: [Amps] Tuned input board on SB-220
> 
> 
> > It is the input waveform of the amp that matters, not the output wave
> form.
> >
> > 73
> > Gary  K4FMX
> >
> >
> > > -----Original Message-----
> > > From: k7rdx [mailto:k7rdx at charter.net]
> > > Sent: Thursday, March 23, 2006 2:10 AM
> > > To: garyschafer at comcast.net; 'noddie'; 'Ed Dial'; amps at contesting.com
> > > Subject: Re: [Amps] Tuned input board on SB-220
> > >
> > > The LDG module works FB with my YC-156 AMP...Output waveform looks
> much
> > > better than with untuned input,however it might taks a shoehorn to fit
> > > inside the Heath amps or at least some re-positioning of components.My
> > > connection to the YC-156 cathode is seven inches from the tuner board
> and
> > > it
> > > provides an acceptable input match anywhere I tune...And fast too.Jim
> > > K7RDX..
> > > ----- Original Message -----
> > > From: "Gary Schafer" <garyschafer at comcast.net>
> > > To: "'noddie'" <noddie at comcast.net>; "'Ed Dial'"
> <diale at mindspring.com>;
> > > <amps at contesting.com>
> > > Sent: Wednesday, March 22, 2006 8:22 PM
> > > Subject: Re: [Amps] Tuned input board on SB-220
> > >
> > >
> > > > 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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