Geoff,
Thanks for the information. I just tried what you suggested, and the rig did
not behave the way you described. So I strongly suspect that the "zero"
function is not operating properly. I'll have to get a schematic of that area
and track down what's happening.
I was listening to a carrier I generated with another rig (a Central
Electronics 100V in SPOT mode) and I was monitoring the result with my 75A4.
The only way I could get the 544 onto the frequency of my 100V carrier was to
match the pitch of the signal received on the 544 with the 750 Hz sidetone
oscillator. It also comes pretty close if I just peak the incoming signal in
the audio filter.
Would you happen to have a schematic of the relevant area you could scan for me?
Thanks,
Jim Hanlon, W8KGI
ps, Are you any relation to the Mendelsons who have a radio store in Dayton,
Ohio?
----- Original Message -----
From: Geoffrey S. Mendelson<mailto:gsm@mendelson.com>
To: Discussion of Ten-Tec Equipment<mailto:tentec@contesting.com>
Sent: Tuesday, April 15, 2008 10:35 AM
Subject: Re: [TenTec] Triton IV questions
On Tue, Apr 15, 2008 at 10:26:05AM -0600, JAMES HANLON wrote:
> First, I notice that there is a "zero beat" switch associated with the
> RF gain control, but it doesn't seem to do anything. If I had designed
> the rig, I might have wired this switch so that it would cut the drive
> off so that I could match the 750 Hz sidetone oscillator pitch with the
> incoming signal without a carrier on the air. But it doesn't seem to
> work that way. (My schematic for the analog rig shows that switch
> controlling the calibrator.) Would you please tell me what the zero beat
> switch is supposed to do, and is there any way, short of just turning
> down the drive, of zeroing a signal.
The rig tunes slightly off frequency in CW mode so that you can hear
signals on the same frequency you are transmitting. (CW Offset).
Turning ON ZERO BEAT turns OFF the OFFSET.
To tune in a signal exactly, you tune in the signal, turn ON the zero
beat and tune until the signal disappears. This takes a little practice
so that it disappears due to zero beating and not you tuning off it
completely. :-)
> Also, the power supply that came with the rig is a model 262G, and the
> info I have is only for the 252G. The difference is that the 262G has a
> VOX circuit with associated VOX Gain and VOX Delay controls. The Delay
> control seems to adjust the "hang time" that the rig stays on after I
> speak into the mike, but I'm not quite sure what the VOX Gain control
> does. Can you give me a description of what it does?
It adjusts the signal level at which the VOX goes into transmit mode,
aka "trips".
Geoff.
--
Geoffrey S. Mendelson, Jerusalem, Israel
gsm@mendelson.com<mailto:gsm@mendelson.com> N3OWJ/4X1GM
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