Skew on DMX241 for Prime Focus BUD

**John Popper** · 03-10-2010 10:23 PM

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

**Iceberg** · 03-10-2010 11:09 PM

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** · 03-10-2010 11:18 PM

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!

**Iceberg** · 03-10-2010 11:23 PM

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** · 03-10-2010 11:41 PM

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** · 03-11-2010 12:54 AM

Originally Posted by Iceberg

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** · 03-11-2010 06:23 AM

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

**WSInternational** · 03-11-2010 03:46 PM

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

**John Popper** · 03-11-2010 05:08 PM

Originally Posted by WSIATLANTA

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** · 03-11-2010 10:23 PM

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

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