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Tech Head - The Technology Section
SDR radio, Software Defined Radio
The Aero Thread..
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<blockquote data-quote="s-band" data-source="post: 980104" data-attributes="member: 407744"><p>Have you tried using the opposite polarisation and flipping the dielectric plate? If you are scratching around for the last 1/2 dB perhaps the other half of the LNBF is better.</p><p>1.5m vs 1.2m ~+1.9dB</p><p>Work out exactly how much more signal you need by turning the 15W dish until you degrade the signal (EbNo) on 15W to the level that you had on 25E, measure the SNR on the SDR(=SNR1). Turn the 15W dish until you get your desired EbNo (still on 15W), measure the SNR (=SNR2). Improvement needed = SNR2-SNR1. That should tell you what you need to do.</p></blockquote><p></p>
[QUOTE="s-band, post: 980104, member: 407744"] Have you tried using the opposite polarisation and flipping the dielectric plate? If you are scratching around for the last 1/2 dB perhaps the other half of the LNBF is better. 1.5m vs 1.2m ~+1.9dB Work out exactly how much more signal you need by turning the 15W dish until you degrade the signal (EbNo) on 15W to the level that you had on 25E, measure the SNR on the SDR(=SNR1). Turn the 15W dish until you get your desired EbNo (still on 15W), measure the SNR (=SNR2). Improvement needed = SNR2-SNR1. That should tell you what you need to do. [/QUOTE]
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