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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Channel Master/Laminas 1.8m project
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<blockquote data-quote="s-band" data-source="post: 986403" data-attributes="member: 407744"><p>When I was testing I noted that the skew was different for each LNA/B tried, I found that I could get an extra dB tweaking the skew manually on a couple. Looking at probes some were a bit off axis. V & H were not exactly 90 degrees separated on some. The C band Titaniums, especially, vary a lot across the band and between polarisations.</p><p></p><p>I did some tests comparing SNR with RF level and at 14dB SNR a 2dB change in RF level equated to a 1dB change in SNR. That was with an SR of 27500 3/4 QPSK on the TBS6983. Your 0.5dB SNR <em>may</em> relate to 1dB difference at RF. LO phase noise can also affect the SNR.</p></blockquote><p></p>
[QUOTE="s-band, post: 986403, member: 407744"] When I was testing I noted that the skew was different for each LNA/B tried, I found that I could get an extra dB tweaking the skew manually on a couple. Looking at probes some were a bit off axis. V & H were not exactly 90 degrees separated on some. The C band Titaniums, especially, vary a lot across the band and between polarisations. I did some tests comparing SNR with RF level and at 14dB SNR a 2dB change in RF level equated to a 1dB change in SNR. That was with an SR of 27500 3/4 QPSK on the TBS6983. Your 0.5dB SNR [I]may[/I] relate to 1dB difference at RF. LO phase noise can also affect the SNR. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Channel Master/Laminas 1.8m project
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