[TenTec] Century 21 Question

[Tom NØJMY]

Curran, here's a reversible no-holes mod that I've done to my C-21's to 
simplify that procedure.

I replace the zero-beat button (those are lousy buttons anyway) with an 
illuminated *push-on/push-off* switch.  You can get them from Allied in 
various colors including red or clear.

Anyway, wire it so the LED comes on when the switch is closed and the 
VFO is in zero-beat mode

Now, when you're going to cruise the band, you first set your offset 
control just a little bit to one side of zero-beat or the other.  Then 
push your new zero-beat switch so that the LED in the button lights up 
(meaning the offset is disabled).

When you hear a station you want to call, just tune the signal to 
zero-beat.  Then press the zero beat button again (the light goes out 
and the offset is turned back on).

1. Now his desired signal will be audible (sometimes it's easy to lose a 
signal with the old switch set-up)
2. You can go ahead and tune the offset control wherever you want it.
3. Your TX will be already be zero-beat with his signal.
4. Give him a call.

It no longer takes both hands to do the "hold button/tune-for-zero-beat" 
operation, and the LED keeps you apprised as to whether you're in 
zero-beat mode or not.

You can get switches that look pretty good, round or square.  I replaced 
the power level switch on mine with a matching SPST momentary contact 
switch, just to make it look nice.

73,
Tom

On 1/27/2010 5:54 AM, Curron HILL wrote:
>
> Can some one explain how to use the zero beat and offset controls on a Century 21?  It is a DC receiver and different than I have ever used.  I know that pressing the zero beat button disables the Offset control.  I know that you tune the CW sound until it goes down to point that you can't hear it. If you continue to tune you hear the CW begin agian going up in pitch. So you back up until it can't be heard again.  Then you tune the Offset until it has a pleasant sound.  The offset it tuning the reciever only and the transmitter stays zero beat correct?  Is it that simple?  Or do you have to anything about which sideband the band works from?  Why the +/- on the offset?  is it so that you can listen to either side of the CW from the Zero Beat point and maybe get away from other transmissions on one side of zero beat or the other to help eliminate QRM?
>
>
>
> Thanks, and 73   Curron KB3DRW
>
>   		 	   		
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.730 / Virus Database: 271.1.1/2647 - Release Date: 01/26/10 13:36:00
>