[TenTec] UCW and LCW

[Ron Morell]

This is interesting Sinisa.  I wonder if the ORION and ORION II operate the
same in this regard.  I notice on my ORION II that the tone of the received
signal is the same in LCW or UCW as long as the receiver is zero beat on the
received signal.  I also notice that when changing from UCW to LCW that the
screen display shows the pass band moving from one side of center to the
other.  As a practical matter it seems to completely eliminate some
interfering signals when I change from UCW to LCW.  I suppose the
interference reduction will depend on the actual frequency of the
interfering signal, that is, whether it is above or below the "desired
signals" frequency.  Visually, I've observed this on the MixW water fall
display as well.  Some unwanted signals seem to have been completely removed
from the passband.  Of course an interfering signal that is within +/- 100
Hz or so will still be there and the tone of the interference will change,
higher or lower in pitch depending.

Maybe I need to work with this some more, but it does seem to have a
desirable effect in my application.
Ron
KA7U


-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of Sinisa Hristov
Sent: Monday, October 30, 2006 12:42 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] UCW and LCW

Duane Calvin wrote:
 
> 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.


This won't work on Orion.
Switching from UCW to LCW will not make any
difference in attenuation of unwanted signals.
Only the audio frequencies will change.

Page 15 of the Orion 565 manual contains an incorrect statement:
  "...operator chooses whether the BFO is above
   or below the target frequency to minimize QRM..."

The truth is that the BFO will be placed in a different position
(relative to the target and QRM frequencies), which is irrelevant,
but the receiver passband will still be in the same position.


73,

Sinisa  YT1NT, VE3EA

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