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RE: CalAmp 130125 DownConvert to 430 MHz



A good suggestion Ron!

It would require the VCO to be tuned down to 1966 Mhz. Surely do-able with
the right microwave test equipment (a spectrum analyzer, a small soldering
iron and very steady hands) to get it re-tuned down there. My "standard"
units don't tune that low.

Using a 43x.xx MHz IF is a preferred IF choice since it plays better with
the 200 MHz wide input combline filter relative to LO and image rejection.
My tests show that the high end roll of the IF ammplifier (which uses some
LP and HP filtering) at 432 in minimal.

Regards...Bill - N6GHz (sent 10:36 AM PDT -6/14/05 - checking to see how
long it takes to get posted!!!)

-----Original Message-----
From: owner-AMSAT-BB@amsat.org [mailto:owner-AMSAT-BB@amsat.org]On
Behalf Of Ron Cade (W6ZQ)
Sent: Tuesday, June 14, 2005 7:28 AM
To: AMSAT
Subject: [amsat-bb] CalAmp 130125 DownConvert to 430 MHz


Alternative to 144 MHz IF would be to re-crystal to 7.680000 MHz. The
crystal is available from Mouser, P/N for reduced case size is
520-HCU768-20. 10 piece price is 41 cents each.
IF at 2.4 GHz will be 433.92 MHz.

73, Ron W6ZQ
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