MURX 'Multi Use(r) Receiver' test site & Satellite tracking station
Station Hardware
Connected to the soundcard of this station is an Icom IC-910 receiver. The murx software will use it as if it were a quadrature receiver. (We don't have one yet.) When the Icom is in SSB mode the result will be a spectrum that is mirrored at 0Hz and limited by the receivers filters (about 3.5KHz). Besides the limited (and 'double') spectrum for our software there is no difference in processing when compared to a 'real' quadrature receiver.Currently the rotors (azimuth and elevation) are not connected to the system. However a simulated rotor is used to test interface. (both remote control by the web interface and automatic tracking)
Station control
(Control the actual transceiver.)
Software radio
Instead of using the 'real' transceiver we offer a software radio. The murx software can handle multiple clients and will offer each its own 'radio'. Each of these radios can be tuned within the sampled bandwidth (Currently 44.1KHz, but only 3.5KHz contains actual signals) which is centered around the frequency selected at the Icom receiver.
Create your own software radio:
Fill in a unique id for your stream (e.g. your callsign)
BPSK-RC receiver
Besides voice also digital modes can be received. Currently a 1200 baud BPSK-RC demodulator plugin is available that decodes the received signal and outputs a KISS datastream containing decoded packets and statistics.
With the following link you will get a continuous data stream of KISS packets:
Automatic Satellite tracking
On this system the 'murx_sattrack' program runs in the background. It will use 'predict' to automaticly start logging data when Oscar-16 passes.
It will set the transceiver to the proper frequency (Doppler corrected) and point the antenna in the right direction.
This has a higher priority than the station web interface and thus overrides it.
Previous passes of Delfi-C3 (automaticly tracked).
Previous passes of Oscar-16 (automaticly tracked).
Previous passes of Oscar-26 (automaticly tracked).