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- Apr 14, 2007
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C band questions please is it just a case of changing your lnb to try for this please are is there more to it ?
LNB diameter is 65mm compared to 40mm for Ku band. You need to attach the C-band LNB so the centreline of the LNB is in the same position as the Ku band LNB is.martin-f said:c band Q please is it just a case of changing your lnb to try for this please are is there more 2 it ?
No need for two actuators. Just put the LNBs side-by-side and they will both be on the arc and can be allocated individual DiSEqC 1.2 positions. If you have an elevation actuator that would need to be controlled separately, so it wouldn't be a position the receiver could access automatically. Also, if I did have 2 actuators the second one would be a declination actuator, not elevation (like my Fibo). BTW, if you put a C-band LNB and feedhorn above the Ku-band LNB that would make a shadow on the dish; placed side-by-side that doesn't happen.Captain Jack said:If you want both on the same dish, put another jack arm for elevation control and a C band LNB above your Ku band one.
Nelson has got that covered. Just move the those arms down. If you do a search you'll find pictures of his dish somewhere.Captain Jack said:The problem with Channel Master dishes is that the LNB holder arms get in the way, so you would need to devise a way to move them aside. And with the LNB on the side - does that not give a worse signal anyway, or does it not matter in C band that much?
There was a modification for Channel Master dishes to allow the side feeds an uninterrupted view, Whether it is an official mod I can't tell.Captain Jack said:The problem with Channel Master dishes is that the LNB holder arms get in the way, so you would need to devise a way to move them aside. And with the LNB on the side - does that not give a worse signal anyway, or does it not matter in C band that much?
martin-f said:thanks again I will give it a go, its something new to play with :-),
I also found this thread interesting,
I recommend C-band also. After more than 20-years (dx kind?) with KU-band I found new "motivation" from 4Ghz. Many, many new channels and maybe less satguys using it, its interesting again to find surprises and changes by channels..?martin-f said:thanks again I will give it a go, its something new to play with :-),
The axis of a polar mount is supposed to be parallel with the axis the planet turns on. If it is not parallel (because the actuator changes its angle) it will not track the arc properly. Also changing the inclination does not have a uniform effect across the arc, and also interferes with skew. On the other hand if the actuator adjusts declination, skew is unaffected, and for any given actuator setting the dish will track a line across the sky that is 100% parallel to the arc. So once you work out that 2º is 15 clicks on the actuator that number is valid for the whole arc, no matter what satellite you are receiving from. With an inclination actuator that is not the case, and requires a different actuator setting for each satellite.Captain Jack said:why would you adjust the dish declination rather than the whole mount elevation?