Now that is the kind of stuff that qualifies someone as a real ham. Good
job Rick. Sometimes we forget that we are all supposed to be technicians
and not just appliance operators. That was what all the technical exams
were supposed to prove when we got our licenses.
Carl Moreschi N4PY
121 Little Bell Drive
Bell Mountain
Hays, NC 28635
----- Original Message -----
From: "Rick, NJ0IP / DJ0IP" <Rick@DJ0IP.de>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Wednesday, April 04, 2007 12:53 AM
Subject: Re: [TenTec] QSK w/amplifier
> Hi Wayne,
>
> Jerry described the problems you can get.
> I used the Ten-Tec 405 amp with my Argonaut for many years.
> It too was carrier-triggered.
> I didn't like that. So I changed it.
>
> Inside the Argonaut you will find two lines called "R" and "T". If I
recall
> correctly (it was 25 years ago that I did this), these lines go high when
> active, to about 8 volts (?) - R when in RX mode or T when in TX mode. I
> tapped into the T-line and keyed a transistor which in turn was used to
key
> the 405 Amp's relay. I also had to make some slight changes to the 405,
but
> it was easy. I documented the changes, but unfortunately all of my gear
and
> manuals is currently packed in shipping boxes in preparation for my move
to
> the states later this month, so it will probably be months before I find
> that old manual.
>
> If you really want to do it right, you need a little external box and you
> attach the keyer to it. When you key it with your keyer, it keys the amp
> through a transistor (you'll need the mod in the amp I spoke of above) and
> about 10ms later it keys the Argonaut's key jack. It also has an
adjustable
> delay that enables you to manually control how long the amp's relay
remains
> keyed after the last dit or dah has come.
>
> I can send you a full description of this keying circuit, but
unfortunately
> it is in German language. However you can see the schematic and the
timing
> diagrams. Given enough time, I can also translate it into English, but I
> won't have time for that until I have finished all of my packing here.
>
> I have used this little box (which also has a home brew C-MOS keyer in the
> same box) for almost 30 years now. It is a great box to have for matching
> almost any amp to any transceiver. Yes, it also keys the higher negative
> voltage keying lines of older amps.
>
> 73
> Rick,
> DJ0IP (NJ0IP)
>
> On Tue, 2007-04-03 at 21:49 -0500, Wayne Whitman wrote:
> > I also sent an email to THP, here is there (very quick) response for
> > anyone who was wondering.
> >
> > "It is not designed to
> > be QSK- compatible but may follow slow semi break-in QSO
> > with Rf sensed keying circuit.
> > It has some rise time and fall time that means amp holds
> > for a second or so after you stop keying."
> >
> > Guess that rules that one out.
> >
> > Thanks for reading and thinking about it.
> >
> > 73,
> > Wayne
> > K4ELO
> >
> > tentec
>
>
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