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 N3OWJ/4X1GM
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