OZ7SAT by AMSAT OZ


#1

The AMSAT OZ team used to operate a legendary ground station, OZ7SAT, offering unique telemetry reception for cubesat and amateur radio satellite operators:

It was an “old school” setup using a wide variety of shell scripts and tools, such as predict, to do automatic scheduling and reception. Decoded telemetry was stored in a mysql database and made available on the website using CGI scripts (yes, we are that old).

Unfortunately, political circumstances forced us to leave this very nice location in 2016, and we have spent 2017 trying to establish ourselves at a new location. We ended up as a group in the OZ7AMG radio club located in the southern part of Copenhagen, where we are now doing a comeback as part of the SatNOGS network :slight_smile:

The antennas are a pair of X-Quads from Wimo with polarization switch, pre-amplifier and bandpass filter for VHF and UHF. The rotator is a Yaesu GS-5600 with G6LVB interface to PC. Receiver is an Airspy R0 SDR connected to an old PC with quad core AMD processor.

Is it still very much a work in progress (forever?) but we can already now receive satellites and we can receive them well :smiley:

Despite a lot of terrestrial noise, in particular on VHF, we have very good SNR from most satellites.

Here, the FUNCUBE-1 BPSK beacon is so strong that we can even see the sode lobes:
https://network.satnogs.org/observations/106675/

A low elevation (10 deg) pass of KKS-1, received almost from AOS to LOS:
https://network.satnogs.org/observations/106164/

More photos from the past and present can be seen in my photo album on Flickr.

Alex


#2

We were a bit worried about what would happen when the others fire up the HF station. The satellite antenna is located just below the multi-band HF beam, and OZ7AMG is known to be a bad ass kilowatt contest station…

In this pass the satellite antenna points at ~ 20 deg elevation. I think the horizontal lines on the waterfall come from the HF transmitter being active:
https://network.satnogs.org/observations/106237/

And here, at around 310 second it looks like we are actually pointing the antenna up into the HF beam while they are transmitting:
https://network.satnogs.org/observations/106679/

Everything survived…