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Re: Mode-S Antennas

I guess maybe it's time to chime in about the possibility of using surplus
Qualcomm materials to build a 2,4 GHz down converter. I've been holding off
as it seemed that the Drake units were an easy way to go and our San Diego
Microwave Group  materials distribution person (Chuck WB6IGP) is kind of
out of commission right now. Since the discussion has come around to LOs
and LNAs for home brew converters, those with an interest might want to
take a look at the SBMS website at :http://www.ham-radio.com/sbms/sd/.   We
have surplus Qualcomm synthesizers and 10 MHz TCXOs that make putting
together a 2256 MHz LO (for 144 IF)  a one evening project.  We  have a
"Round " board
that conatins a small 2.5 GHz LNA that can be modified for 2.4 GHz by using
a different filter.  We also have surface mount mixers that will work at
2.4 Gz as well. I haven't put together a  2.4 converter with all of these
particular  components but probably should do it & write up a description.
If there's interest I'll see whah I can do to support distribution of the
material in the near term.
 - Kerry N6IZW

At 11:00 AM 2/13/01 -0600, Dave Metz wrote:
>> From:          "Frederick M. Spinner" <fspinner@hotmail.com>
>> To:            amsat-bb@AMSAT.Org
>> Subject:       Re: [amsat-bb] Mode-S Antennas
>> Date:          Tue, 13 Feb 2001 15:15:58 -0000
>> The hard part is the oscillator.  I'm kicking around the idea of using
>> a Maxim MAX2751 VCO ($3.50 in one-seys, $1 in Qty) and some sort of PLL 
>> circuit-- the simple one in the Drake-- a fixed divider and a XOR phase 
>> comparator-- or more complex like a National LMX2326 and a PIC to
program it 
>> (same parts count, and minimal difference in price-- and more flexible)...

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