Skew on DMX241 for Prime Focus BUD

[John Popper]

I tried all afternoon to adjust this LNBF but still not gettiing it right, Analog looks great but digital has been a hassle. What should be the skew on this if I wanna put it in my 7ft prime focus

here's a pic of the dish with a ku band lnbf (which has worked great btw) but C band is stomping me

 

[Mr Tony]

John
I've noticed a few LNB's that I have are 90 degrees off

my Geostapro duals, the old BSC421 are off by 90 degrees...this one might be too

so 0 skew for me is at 9:00 or 3:00 (if like a clock)

below pic is set to 0 skew for my true south (well 91W...my TS is 93W but there is no C-Band there)

 

[John Popper]

Thanks Ice, hopefully someone with this model can chime in.

btw it's been quite the ordeal since this BUD is very close to the edge of the roof so I can only make modifications by completely moving the dish to the center, and lowering the elevation to about 125W, making it very difficult to fine tune so that's why I want to know the proper skew on this!

 

[Mr Tony]

have you tried to blind scan? That is how I knew my 421 was off by 90 degrees by getting the H side on V and vise versa

 

[hd fan]

open the cover and look at the probes inside. when parked at true south one has to be paralell to ground and the other one vertical. that is 0 skew for true south. if you selected them wrong then the TP's will scan in reversed (H as V and viceversa) but at least at maximum signal. you can then rotate them 90 degrees like Iceberg said.

 

[John Popper]

have you tried to blind scan? That is how I knew my 421 was off by 90 degrees by getting the H side on V and vise versa

yeah, tried to do that but was getting H where V was supposed to be, so I rotated the thing (but I guess more than 90 degrees) and then I lost all signal, but will try again tomorrow with yours and HD fans suggestion

 

[Cadsulfide]

Pop the cap on the lnb and mark the positions of the antenna's with a sharpie on the outside.

 

[WSInternational]

DMX241 Polarity

The DMX241 is not offset. The zero degree is on the probe.

 

[John Popper]

The DMX241 is not offset. The zero degree is on the probe.

I know that, but still you gotta align it to your dish's 4 point holder, and the 7fter is different than my 10 ft

 

[John Popper]

I give up on bandstacked LNBFs, in my experience their performance is sub-par, I went ahead and replaced this DMX241 with an ancient Chaparral feedhorn and LNB (just like the one on my 10ft) and Im getting a stronger signal (about 15-20% better) now I need to get a servomotor cause all I get right now is V polarity.

2 dms c/ku lnbfs and this DMX241 later I've learned the lesson, no more C Band bandstacked LNBFs for me

 

[Tron]

Neither the C/Ku nor the DMX-241 LNBFs are bandstacked... The only bandstacked C-Band LNBF out there that I know of at the moment is this one made by Eagle Aspen. I use it on my 6-footer with very good results...

 

[John Popper]

Neither the C/Ku nor the DMX-241 LNBFs are bandstacked... The only bandstacked C-Band LNBF out there that I know of at the moment is this one made by Eagle Aspen. I use it on my 6-footer with very good results...

well then Im done with those models I mentioned before, I tried a million ways and do not get acceptable results, at least not as good as with the chaparral feedhorn and LNB