Or you could also build up an interface of your own,
probably for less than $10 or so.
For the RX/TX keying of my transverters and/or
amplifiers I use the EXT T/R jack on back of the
Pegasus into a Radio Shack reed relay (part #
275-233), it's coil is spec'd as being ~11ma at 12V,
so it is a very small load on the Pegasus. I use one
of the 13.8V RCA acc jacks on the back of the Pegasus
for the + voltage side the relay coil and let the EXT
T/R pull it to ground, I also include the diode to
supress the reverse voltage spikes from the relay coil
when it opens.
The RS 275-233 relay's contacts are only rated at 1A @
125VAC though so you will need to look for another
relay with a higher contact rating or use the 275-233
to drive a second higher current relay. I have no idea
what the keying circuit current of the SB220 is, so
you'll need to find that out from the SB220 manual's
specifications or measure it yourself.
The Pegasus manual rates the EXT T/R jack for 200ma @
24V max, so any relay coil rated below that level
should do the trick.
Duane
N9DG
--- "Paul Christensen, Esq." <w9ac@arrl.net> wrote:
> I just found it...it's called the AmpKeyer and it's
> $39.95 from "The
> HeathKitShop."
>
> If you don't mind performing a very minor mod to
> your SB-220, the Harbach
> solution is the best and it's half the cost of the
> AmpKeyer....here info on
> the AmpKeyer....
>
> http://www.theheathkitshop.com/ampkeyer.html
>
> -Paul, W9AC
>
> ----- Original Message -----
> From: "Paul Christensen, Esq." <w9ac@arrl.net>
> To: <tentec@contesting.com>
> Sent: Tuesday, February 25, 2003 21:21 PM
> Subject: Re: [TenTec] Pegasus and Heathkit SB220 amp
>
>
> > Although Ten-Tec specs the key line voltage at low
> DC voltage for warranty
> > purposes, the TO-220 style keying transistor in
> the Pegasus is actually
> > speced to handle well over 100VDC, but I don't
> recall if it's rated to 170
> > V. My Pegasus keys my ALPHA SEVENTY amplifier
> with a 70V key line and I
> > have no trouble.
> >
> > Harbach engineering sells the most elegant
> solution for your SB-220. From
> > the Harbach web page at:
> >
> >
>
http://www.harbachelectronics.com/reference/harpg3cart.htm
> >
> > "SK-220 SOFT-KEY MODULE - The SK-220 is an
> interface module which allows
> > your transceiver to key the SB-220 seeing only 0.7
> volts at 1.5 mA. The
> > original SB-220 circuit had +120 volts on the
> keying line. This easily
> > installed unit is only $20.00 with $1.20 sales tax
> for Indiana residents."
> >
> > Another solution is to build or purchase an
> external interface unit with a
> > HV Darlington switching transistor. Someone just
> recently came out with a
> > nice, opto-isolating all-in-one amplifier
> interface and I just can't
> recall
> > who it is. Perhaps someone can chime in and help
> me with my memory.
> >
> > -Paul, W9AC
> >
> >
> >
> > ----- Original Message -----
> > From: "Wayne" <aa5jj1@cox.net>
> > To: <tentec@contesting.com>
> > Sent: Tuesday, February 25, 2003 21:06 PM
> > Subject: [TenTec] Pegasus and Heathkit SB220 amp
> >
> >
> > I have a Heathkit SB220 2KW PEP amp and I have
> been using it on a Kenwood
> > with a external keying relay to protect the rig
> form the 170 volts that
> > comes out of the keying realy in the SB220, The
> Pegasus can not us this
> and
> > I am not sure how to use the Pegasus with my SB220
> amp......Please Help
> >
> > Thanks Wayne AA5JJ
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