Dear all, We have a functional Ground station setup at QTH location MK68WM. We have a 2 Unit array of circularly polarized Yagi antenna mounted on antenna rotor system for tracking satellites operating in UHF band. Instrumentation available with us is Signal generators, Signal Analyzers, Vector Network analyzer, Spectrum Analyzer. The ground station setup includes antenna,Low noise amplifier, followed by 15m LMR 400 coax carrying signals to Kenwood TS2000 and RF switches to protect LNA during transmission.
We wish to obtain G/T ratio of our system. Could you please throw some light on how to proceed?
One way to measure the g/t is to use sun noise. You point your antenna toward the sun and cold sky and measure the delta noise. Use that attached ss to calculate the g/t . I have a similar system and let compare notes. Also take a look at the SETTI League doc for back grown
nick
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Rupesh Lad Sent: Wednesday, June 04, 2014 3:31 AM To: amsat-bb@amsat.org; Rupesh Lad Subject: [amsat-bb] Obtaining G/T of the satellite Ground Station.
Dear all, We have a functional Ground station setup at QTH location MK68WM. We have a 2 Unit array of circularly polarized Yagi antenna mounted on antenna rotor system for tracking satellites operating in UHF band. Instrumentation available with us is Signal generators, Signal Analyzers, Vector Network analyzer, Spectrum Analyzer. The ground station setup includes antenna,Low noise amplifier, followed by 15m LMR 400 coax carrying signals to Kenwood TS2000 and RF switches to protect LNA during transmission.
We wish to obtain G/T ratio of our system. Could you please throw some light on how to proceed? -- Regards, Rupesh Lad _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
The Software Orbitron, allows Sun tracking as an option, assuming your rotator system is compatable with this software. Rather than tracking a satellite you can change it to track the sun/moon, in the settings page It connects via WiSPDDE software to the rotator system.
You then need a way of measuring the noise when pointed at the sun and pointed away from the sun.
Measure the noise between the preamplifier and the Kenwood radio, but be careful of any DC power on the cable to power the pre-amplifier. The spectrum analyser should be OK for this job.
participants (3)
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Daniel Cussen -
Nick Pugh K5QXJ -
Rupesh Lad