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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
AV-Comm Polariser + Zinwell lnbf
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<blockquote data-quote="s-band" data-source="post: 1004590" data-attributes="member: 407744"><p>When I was playing with the Fortec 2.4, I had no success with the Zinwell LNB and couldn't work out why. I ran a few noise figure & gain tests with the Zinwell compared against a Tit, Norsat & Chaparral. The NF was better than the Tit but not as good as the Norsat or Chaparral. However, there was something a bit strange that I put down to local interference. So the next step was to check the phase noise. Hardly needed, I could see the problem feet away. The LO appears to be injection locking an oscillation in the front end or vice versa. Curiously, the local oscillator can be stopped altogether with some input terminations. It does it on V & H.</p><p></p><p>The attached shows the IF output with a strong input signal and the 5150ish muck that comes out of the input guide. It's ******. Not surprising that no TV transponders would lock whilst I could still see something from the beacons.</p></blockquote><p></p>
[QUOTE="s-band, post: 1004590, member: 407744"] When I was playing with the Fortec 2.4, I had no success with the Zinwell LNB and couldn't work out why. I ran a few noise figure & gain tests with the Zinwell compared against a Tit, Norsat & Chaparral. The NF was better than the Tit but not as good as the Norsat or Chaparral. However, there was something a bit strange that I put down to local interference. So the next step was to check the phase noise. Hardly needed, I could see the problem feet away. The LO appears to be injection locking an oscillation in the front end or vice versa. Curiously, the local oscillator can be stopped altogether with some input terminations. It does it on V & H. The attached shows the IF output with a strong input signal and the 5150ish muck that comes out of the input guide. It's ******. Not surprising that no TV transponders would lock whilst I could still see something from the beacons. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
AV-Comm Polariser + Zinwell lnbf
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