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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_______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb