There are two ways this is useful that I'm aware of. First, if you are used
to some other brands of radios, they use UCW. Others use LCW, so it could
be just to match what you're used to. But the real usefulness is there is a
strong interfering signal which is far enough away that switching from LCW
to UCW places that signal on the other side of zero beat - i.e., no longer
in the passband of the RX. Of course, that won't work for a close signal,
and filters may work just as well. But, theoretically, switching from one
side to the other presents you with easier conditions to work the filters
with. I've not found this useful to date, but should try it more often.
73, Duane
Duane Calvin, AC5AA
Austin, Texas
www.ac5aa.com
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of Martin AA6E
Sent: Sunday, October 29, 2006 4:26 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] UCW and LCW
Steve Hunt wrote:
> John,
>
> I'm not an Orion owner, but if it's the same as most other rigs .....
>
> When switched to UCW the receiver will pick up CW signals that are higher
than the displayed frequency
> When switched to LCW the receiver will pick up signals that are lower than
the displayed frequency
>
> So using your example, when you're tuned to 7019 UCW you can hear signals
at 7020 because they're higher. If you tune to 7021 and select LCW you'll
hear the same signal because it's now lower.
>
> I think I'm saying the same as everyone else but in a slightly different
way :)
>
> Hope this helps,
> .
> 73,
> Steve G3TXQ
Yes for some radios, but not the Orion. The Orion "dial" frequency is
the center of the passband for LCW or UCW if PBT=0. An incoming signal
at that freq. produces a tone at the sidetone/spot freq., e.g., 700 Hz.
The difference between LCW and UCW is what happens when you tune off
frequency, say up by 100 Hz. For LCW, the audio tone will go up (like
tuning an LSB voice signal). For UCW, the tone goes down (like USB voice).
I have never seen the need for both LCW and UCW. I always use LCW
myself. Just personal preference.
73 Martin AA6E
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