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Re: RH and LH CP simutaniously
- Subject: [amsat-bb] Re: RH and LH CP simutaniously
- From: "John B. Stephensen" <kd6ozh@xxxxxxxxxxx>
- Date: Sun, 4 Jan 2009 04:38:40 -0000
The entire RF spectrum is being modulated, so if there is another signal
30-40 kHz away from the desired signal, it will be modulated and one of the
sidebands will be on the same frequency as the desired signal.
73,
John
KD6OZH
----- Original Message -----
From: "R. Chastain" <suenrod@yahoo.com>
To: "Amsat-BB" <amsat-bb@amsat.org>
Sent: Sunday, January 04, 2009 03:32 UTC
Subject: [amsat-bb] Re: RH and LH CP simutaniously
But if the switching frequency was say.... 30-40khz, wouldn't the sidebands
be so far out of range so as not to cause interferance.
RoD
KD0XX
--- On Fri, 1/2/09, John B. Stephensen <kd6ozh@comcast.net> wrote:
From: John B. Stephensen <kd6ozh@comcast.net>
Subject: Re: [amsat-bb] RH and LH CP simutaniously
To: "R. Chastain" <suenrod@yahoo.com>, "Amsat-BB" <amsat-bb@amsat.org>
Date: Friday, January 2, 2009, 6:30 PM
You can use a 90-degree hybrid splitter/combiner to produce LHCP and RHCP
for
two receivers. Switching will produce sidebands at the switching frequency
and
alias undesired signals into the receiver passband.
73,
John
KD6OZH
----- Original Message ----- From: "R. Chastain"
<suenrod@yahoo.com>
To: "Amsat-BB" <amsat-bb@amsat.org>
Sent: Friday, January 02, 2009 23:15 UTC
Subject: [amsat-bb] RH and LH CP simutaniously
Hi all,
Has anyone ever considered the possibilty of using PIN diodes and a free
running square wave oscillator to electronically switch between RHCP and
LHCP?
The switching frequency would have to be high enough so as to not introduce
a tone to the signal.
Just a thought I have had for awhile.
RoD
KD0XX
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