Hi Mark,
Very simple system. I was not trying to capture the pictures, but merely
detect the signal. So I used my terrestrial 5.760 DEMI transverter. Measured
it on the bench at 5.84 GHz, it was down about 15 dB from 5.76 G.... The
transverter uses a 144 MHz IF, so simply used my Funcube set to 224 MHz.
The dish is 2' with a Directive Systems 5.76 G feed horizontally polarized.
I calibrated Azimuth using Sun Alignment yesterday and left the tripod set
up over night. The little green object on top is a digital inclinometer.
Netbook is running HDSDR for the FunCube.
http://users.burlingtontelecom.net/~n1...@burlingtontelecom.net/images/Dish
setup.jpg
Real crude, but worked. I'd like to dig up a 5.84 G preamp.....
Mike
----- Original Message -----
From: "Mark L. Hammond" <marklhamm...@gmail.com>
Subject: Re: [amsat-bb] NIWAKA detected in VT on 5.84 GHz!
Congrats, Mike! That's a nice result.
Do you have details of your downconverter/receive/antenna system posted
online?
73,
Mark N8MH
At 08:03 AM 11/10/2012 -0500, Mike Seguin N1JEZ wrote:
Hi Takushi,
Success! I was able to detect NIWAKA. It was lower in frequency that I
expected, but with the Funcube, easy to spot.
The Doppler was huge! and I was moving the dish almost continuous to try
and keep up. I'll edit the I&Q RF file and post it so folks can play it
back for themselves.
Two quick screen shots. In the first shot, you can see the signal on the
left side Doppler shifting down. In the second shot, a close up of one
data burst with Doppler - about 3 secs or so...
http://users.burlingtontelecom.net/~n1...@burlingtontelecom.net/images/NIWAKA_1.jpg
http://users.burlingtontelecom.net/~n1...@burlingtontelecom.net/images/NIWAKA_2.jpg
The 5.84 GHz transmitter seemed to come on very close to the set time.
First detection at 12:24:21 UTC.
More later.
73,
Mike, N1JEZ
AMSAT 29649
"A closed mouth gathers no feet"
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