[TenTec] dit chopper IC-7800

[Bob Henderson]

Duane

I have been running full QSK for almost 30 years.  I have never used a
keying loop with my amps and I don't have hot switching problems.
Currently, I have two Orions, one drives an Alpha 87A and the other an Acom
1000.  The 87A is pin diode switched but the Acom uses a vacuum relay.  Both
amps are controlled with direct connections from the Amp Key 1 outputs of
the Orions.

With apologies for mentioning the unmentionable..........I have previously
used these amps successfully in QSK with TS930, TS870, TS950, TS570,
FT100MP, FT1000MP Mk V Field, & Elecraft K2.  The only radio I have which
will not work well without modification is my Omni VI+.  The VI+ doesn't QSK
properly with these amps whether I use a loop circuit or not.  The only way
I have been able to get either of these amps to work properly in QSK with
the VI+ is by retiming the TX Out signal from the VI+.  TX Out from the Omni
VI+ is enabled in a timely fashion on key down so there is no leading edge
problem but it is disabled about 15-20mS too soon and so causes tail end
clipping big style.  The loop circuit on the VI+ appears timed specifically
for Ten Tec amps.

Bob, 5B4AGN


----- Original Message ----- 
From: "Duane A Calvin" <ac5aa at juno.com>
To: <tentec at contesting.com>
Sent: Tuesday, August 10, 2004 7:44 PM
Subject: Re: [TenTec] dit chopper IC-7800


> Hi Tommy,
>         I don't understand your comment - how can it run full QSK without
> a keying loop for the amp?  Either something is hot switching, has the
> potential to, or it's not really running full QSK.  Maybe I don't
> understand the comment.  (Or, maybe the rig is QSK but the amp isn't - it
> stays in transmit?)  My Orion runs full QSK fine with my Alpha 99, but I
> don't know at what speed it breaks down.  Certainly does well at 40 WPM,
> which is about as fast as I go.
>
>         73,  Duane
>
> On Tue, 10 Aug 2004 13:45:09 -0400 "Tommy" <aldermant at alltel.net> writes:
> > That's OK Rick, I understand.
> >
> > Unfortunately, I think Ten Tec has taken your exact track on the
> > amplifier/QSK issue. The Orion, with the latest versions of
> > firmware, v1.371
> > and v1.370, will not work with the Ten Tec Titan 3. Maybe someday?
> > But as
> > you say, high speed CW ops are an extremely small minority of active
> > hams
> > and marketing types don't think there are enough sales (and
> > rightfully so)
> > to worry about that issue or operating the rig in the CW mode much
> > over
> > about 50 wpm. However, since you do not need a keying loop to run
> > full QSK
> > with Icom gear, that IC-7800 running at 80 wpm last night sure did
> > sound
> > excellent.
> >
> > Tom - W4BQF
> >>
>
>
> Duane Calvin, AC5AA
> Austin, Texas
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>