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<blockquote data-quote="s-band" data-source="post: 1164189" data-attributes="member: 407744">I carried out some tests to compare a Bullseye LNBF with a SMW Q-PLL Type C on a 1.8m PF dish.[ATTACH]157139[/ATTACH] SMW Q-PLL Type C on IRTE C120 adapter[ATTACH]157138[/ATTACH]Bullseye LNBF with feed removed fitted to C120 flange from Invacon LNBThe plots here used Crazyscan's blind scan 1 with 2MHz steps. This gives more repeatable results than BS2 but doesn't catch all signals. I would normally compare systems using Sun noise but the tracking dish is out of use at the moment. Notes:<ul>
<li data-xf-list-type="ul">Cloud cover changes resulted in 0.5dB variations, maybe more.</li>
<li data-xf-list-type="ul">7E chosen as it was of interest at the time</li>
<li data-xf-list-type="ul">10804 and 10845H give random values sometimes</li>
<li data-xf-list-type="ul">Skew set by nulling beacons. SMW had &gt;32dB X polar rejection and Bullseye &lt;27dB</li>
<li data-xf-list-type="ul">10720H varied by the most with varying cloud (to be expected)</li>
<li data-xf-list-type="ul">Number of feeds varied through day</li>
<li data-xf-list-type="ul">Might be better to do 7W as that has most low level signals</li>
<li data-xf-list-type="ul">High SNR signals give poor indication of differences as 1dB RF change results in &lt;&lt;1dB SNR change when &gt; about 15dB SNR.</li>
<li data-xf-list-type="ul">BS1 used with 2 MHz steps, BS1 &amp; BS2 scans saved as .ini</li>
</ul>[ATTACH]157141[/ATTACH]&nbsp; [ATTACH]157140[/ATTACH][ATTACH]157142[/ATTACH]&nbsp; [ATTACH]157143[/ATTACH]</blockquote>

[QUOTE="s-band, post: 1164189, member: 407744"] I carried out some tests to compare a Bullseye LNBF with a SMW Q-PLL Type C on a 1.8m PF dish. [ATTACH]157139[/ATTACH] SMW Q-PLL Type C on IRTE C120 adapter [ATTACH]157138[/ATTACH]Bullseye LNBF with feed removed fitted to C120 flange from Invacon LNB The plots here used Crazyscan's blind scan 1 with 2MHz steps. This gives more repeatable results than BS2 but doesn't catch all signals. I would normally compare systems using Sun noise but the tracking dish is out of use at the moment. Notes: [LIST] [*]Cloud cover changes resulted in 0.5dB variations, maybe more. [*]7E chosen as it was of interest at the time [*]10804 and 10845H give random values sometimes [*]Skew set by nulling beacons. SMW had >32dB X polar rejection and Bullseye <27dB [*]10720H varied by the most with varying cloud (to be expected) [*]Number of feeds varied through day [*]Might be better to do 7W as that has most low level signals [*]High SNR signals give poor indication of differences as 1dB RF change results in <<1dB SNR change when > about 15dB SNR. [*]BS1 used with 2 MHz steps, BS1 & BS2 scans saved as .ini [/LIST] [ATTACH]157141[/ATTACH] [ATTACH]157140[/ATTACH] [ATTACH]157142[/ATTACH] [ATTACH]157143[/ATTACH] [/QUOTE]

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