>Date: Tue, 03 May 2005 14:21:22 -0600
>From: "Dave" <frstbaptistchurch@wyoming.com>
>Subject: [TenTec] TT amp voltage
>To: tentec@contesting.com
>Message-ID: <web-127512035@wyoming.com>
>Content-Type: text/plain; charset="ISO-8859-1";
>format="flowed"
>Hi, as owner of a number of classic TT rigs, the
>omni a/b/c does have
>a keying line for non qsk amplifiers.... there is
>a delay that can
>be adjusted, a trim pot....
>this is vastly different than the T - voltage output
>at the accessory
>plug..... that is used for QSK, with TT amps, I
>use the original
>Hercules 444.... that is the sequential voltage
>for control
>circuitry from tx to rx, is not adjustable....
>you can even run the herc from the 540 and 544 by
>using the T
>voltage..
>with the 540/544, of course, the band switch of the
>rig does not
>operate the bandswitching of the amp, the Omni c
>does control that
>feature of the amp, not sure about the omni a/b
>Dave K8BBM
>I've got the 444 manual, can provide info for those
>who want it.
As Dave/K8BBM mentions, the "T" line was used to
control full QSK amps. That "T" line output existed on
at least the Omni A/B/C/D, the Corsair and the Corsair
II. All of the early Omnis and the Corsair (but not
the Corsair II) also had the accessory output for auto
band switching.
The "T" line is switched directly by a transistor.
The relay controlled amp keying line is switched by a
relay with variable time delay, however that is only
used for non-QSK amps.
Hey Dave!
How do you like your Hercules 444?
I bought one a year ago at a local Hamfest and am very
pleased with it.
Fortunately the finals were OK.
I've got the SD series transistors in the final
instead of the MRF428's.
I did have to do repairs to the QSK circuitry (bought
one of the last vacuum reed relays that TenTec had in
stock). I still need to dig into it cuz I don't get an
auto reset function when the mode operate/standby
switch is cycled after an overload. I've got to kill
AC power in order to reset. I suspect a bad chip on
the control PCB - but that's a minor problem.
I also added a slight time delay to the ovr drive
shutdown circuitry. It was much too fussy.
I've keyed it with both the conventional non-QSK relay
output on my Omni-C and on my Corsair II and with the
"T" line but prefer to use the "T" line.
Doug/WA1TUT
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