Professional help req

Information exchange on LNBs, Single satellite, motorised and multi-satellite systems. DiSEqC switches, positioners, motors, actuators, dish-alignment etc.


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Old 22-01-2008   #26
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My System: Triple Dragon with HDD/USB stick, Dreambox 8000, Humax HDCI2000, Echostar AD3000ip & SR8700, Aston Simba, RSD ODM300. Swedish Microwave 1.2 Motorised dish / Invacom C120 twin LNB driven by the AD3000. 3 other fixed dishes.


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Although they introduced a small insertion loss, you could 'fine tune' the skew to compensate for any polarisation offset at the extreme ends of the arc.

Theoretically this wasn't necessary as I have a polar mount, but in practice I found that I could indeed increase the signal level on some extreme positions (probably a slightly misaligned dish setup over time).

Az/El mounts need polarity offset adjustment for each position in theory, but not really necessary these days with high gain low noise LNB's etc.

Llew

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Old 22-01-2008   #27
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My System: 2.4mtr Channel Master Dish, Fracarro Penta 85cm Dish, 64cm Traix Dish with 4 multi LNB'S Sky HD, Dreambox 800, Dreambox 500, IPBOX 250, Sky HD and a mad wife !

Guys have managed to get my hands on a batch of norsat lnbs.

They are not for the freq I want but I can do some messing with them and see the results.

Got 4708B on the way.

So I'll be trying 12.25-12.75 range.

If its any good then can contacts the yanks and get the 4106A.
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