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<blockquote data-quote="Vipersan" data-source="post: 892362" data-attributes="member: 325666">Ok ..to wrap up the Saorsat phase of the experiment ..I adapted the lnb and feed to temporarily take the Hughes depolariser ..Tried it in 2 positions at 45 degrees to the pseudo linear inverto lnb ..Which now has no septum so would have difficulty separating RHCP from LHCP ..This proved to be true and the Hughes depolariser gives this ability back at least partially..Switching the inverto electrically between RHCP and LHCP does introduce a small variance in gain ..but not enough to disprove the lnb is working in pseudo linear..The relative positioning of the hughes depolariser makes for a dramatic variation.Scans A and B are the inverto switched electronically with the depolariser in the first postion....and you clearly see ..errr ..nothing at the chosen saorsat test frequency 20185but with the depolariser in the second position and the inverto voltage switched C and D scans clearly show a constellation much like I'd expect to see on an unmodified Inverto straight out of the box..Similar gains ..and 2 ..possibly 3 signals/footprints overlayed at 20185..the Saorsat signal is clearly there QPSK in the constellation ..as are t'other signals ..hence unlockable...at my location.Interesting to reverse engineer and experiment ..but nothing to be gained ..so will now work on moving the local osc frequency of the modded pseudo linear inverto ..and finding another use for it.rgdsVS</blockquote>

[QUOTE="Vipersan, post: 892362, member: 325666"] Ok ..to wrap up the Saorsat phase of the experiment .. I adapted the lnb and feed to temporarily take the Hughes depolariser .. Tried it in 2 positions at 45 degrees to the pseudo linear inverto lnb .. Which now has no septum so would have difficulty separating RHCP from LHCP .. This proved to be true and the Hughes depolariser gives this ability back at least partially.. Switching the inverto electrically between RHCP and LHCP does introduce a small variance in gain ..but not enough to disprove the lnb is working in pseudo linear.. The relative positioning of the hughes depolariser makes for a dramatic variation. Scans A and B are the inverto switched electronically with the depolariser in the first postion.. ..and you clearly see ..errr ..nothing at the chosen saorsat test frequency 20185 but with the depolariser in the second position and the inverto voltage switched C and D scans clearly show a constellation much like I'd expect to see on an unmodified Inverto straight out of the box.. Similar gains ..and 2 ..possibly 3 signals/footprints overlayed at 20185.. the Saorsat signal is clearly there QPSK in the constellation ..as are t'other signals .. hence unlockable...at my location. Interesting to reverse engineer and experiment ..but nothing to be gained ..so will now work on moving the local osc frequency of the modded pseudo linear inverto ..and finding another use for it. rgds VS [/QUOTE]

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