[TenTec] Orion Main and Sub frequency difference

[Ron]

Ken,
This is an interesting idea and would probably be interesting to listen too.
So far in my use of diversity reception, I've only worked CW, and the speed
of the signal tends to obscure phase roll, but if I were listening to music
or perhaps certain types of audio, I would notice it.  I tend to listen to
one side of the signal at a wider bandwidth and lower amplitude as well, so
have not taken exception to a 4 Hz frequency difference yet.

Would you give me an example of how you would use pure diversity reception
to a communication advantage?
Ron
KA7U

-----Original Message-----
From: tentec-bounces at contesting.com
[mailto:tentec-bounces at contesting.com]On Behalf Of Ken Brown
Sent: Wednesday, April 12, 2006 9:32 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Orion Main and Sub frequency difference


If someone wanted to use two separate directional antennas connected to
two separate receiver antenna inputs and listen to them with each
receiver in opposite channels of stereo headphones, the local
oscillators would need to be phase locked. Not just very close to
identical frequencies. Otherwise the rolling phase difference of the two
LOs would ruin the spatial diversity effect we are trying to get. In
fact, why use two phase locked LOs at all? Use one LO and a power
divider (for each LO needed that is. That could be two LOs, 1st LO and
BFO, for a "single conversion" receiver, which is really double conversion)

I would like a setup like this. I'm more interested in listening to two
phase locked receivers on the same frequency, with identical front ends,
IFs, detectors and audio stages, than I am interested in listening on
two different frequencies.

Ken N6KB

Ron wrote:
> Carl,
> I've checked very carefully on my ORION II and there is 4 hertz of
> difference between the Sub Receiver and Main Receiver at 15.0 MHz.  This
> might give a very mild reverb effect on a music note...  But I can not
> really observe it at all, unless I listen to the CW offset to get a pure
> note.  I'm not sure if I'm perfectionist enough to make an adjustment to
> align these two receivers to this level or not.  Maybe on a steady carrier
> would warble enough that I would want to.
>
> But it would be nice to have it as a feature in the N4PY software.
> Ron
> KA7U
>
> -----Original Message-----
> From: tentec-bounces at contesting.com
> [mailto:tentec-bounces at contesting.com]On Behalf Of Carl Moreschi
> Sent: Wednesday, April 12, 2006 5:17 PM
> To: tentec
> Subject: [TenTec] Orion Main and Sub frequency difference
>
>
>
> Bill,
>
> I don't know why I never thought of this before but I have a diversity
mode
> in my N4PY Orion program.  It sets the two radios to the same frequency as
> you tune
> with the remote tuning pod.  I can easily put in a user configurable
> frequency difference in my program to handle a few hertz offset.  I am
going
> to add this to the next version of my program.  Thanks for the idea.
>
> 73,
>
> Carl Moreschi N4PY
> 121 Little Bell Drive
> Bell Mountain
> Hays, NC 28635
>
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