[Ground-station] Origamisat-1

Mike Seguin n1jez at burlingtontelecom.net
Wed Jan 23 12:59:39 EST 2019


On January 18, Origamisat-1 was launched in to orbit. Developed by the 
Tokyo Institute of Technology, this satellite carries a 5.84 GHz 
downlink similar to the one on FITSAT-1 NIWAKA.

Back in 2012, I was able to detect NIWAKA using my portable 5.760 GHz 
rig. At the time, the satellite was primarily only active over the 
control ground station in Japan. I put in a request for activation over 
the East Coast of the US for several passes and was able to detect the 
5.84 GHz downlink.

I've been in contact with the control operators of Origamisat-1 and they 
are interested in activating the 5.84 GHz downlink for me during some 
East Coast passes.

Tracking Origamisat-1 is a real challenge. It is a LEO, so is only 
visible for 10-15 minutes depending on the pass. The challenge is not 
only tracking the satellite both AZ and EL with a dish that has maybe 
3-5 degree beamwidth, but the Doppler can run a little over +/-100 kHz.

The 5.84 GHz downlink is 420KF1D 115kbps. It transmits for 10 secs and 
is then off for 5 secs and then repeats.

For my NIWAKA reception, I used a 2' dish with my DEMI 5760 transverter 
and for an IF, a Funcube Dongle SDR tuned to 224.000 MHz. I used a 
original Funcube for my first reception which only had 96 kHz BW, but 
will use a Funcube Pro+ this time which has 196 kHz BW which should 
eliminate having to tune at all during the pass.

Is there any interest from others in trying to detect the downlink?

I will be looking at possible passes in early February. The Origamisat-1 
team is now still in the initial testing phases, so it will be a while 
before I can try.

If you are interested, please let me know so we can coordinate our efforts.

-- 

73,
Mike, N1JEZ
"A closed mouth gathers no feet"



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