LNBFs What isn't said on the paperwork.

[Desertnight]

In trying to make a decision on which lnbf to buy, I do notice from the what is not being said on the installation information of the lnbf and what to expect after installing one.

I'm looking at the following LNBFs for use with my Sonicview 360 Elite slaved to my DSR922 or DSR920.


On the DMX741 and BSC621 -- once the vertical and horizontal polarities are set on these lnbfs at the dish, can skew be adjusted from the DSR or the signal and quality be adjusted by the SV360? Or do I have to go back out to the lnb and make those adjustments again?

I know some channels are weaker than others and sometimes an adjustment has to be made.

What about the Geosatpro CK-1???

What about the Chapparal Corotor II?

What are the drawbacks of each one of these? What information is not being said that a person ends up learning after-the-fact?

I'm located almost in the middle of the U.S. footprint, being in western Colorado just a few miles from the Utah state line.

I've read the equipment review on the DMX741 and BSC621 on this forum, but there are still these questions.

Thanks.

 

[Mr Tony]

all of the voltage sensored LNBF's (621, 741, C/K1) you have to physically change skew on the LNB. There is only one coax from them to the receiver

Only the corotors that have the 3 wires for polarity can polarity be adjusted on the receiver

 

[Anole]

You are right, it's a technical hobby, and a certain knowledge is assumed of the participants.
Model railroading, photography, musical instruments, oil painting, and gardening are, too.
Luckily, we have a nice forum like this to help educate and clarify. - :up

Iceberg pretty well summed up your answer, above.

'bout the only secret to add, is that for Ku, the voltage-controlled LNBF's (741, Ck1, & 621) are very touchy to align on Ku.
Those who go to the trouble to get 'em properly situated, are rewarded with good performance (C seems fine on 'em all).

There is only one additional secret weapon, and that's what's called an OrthoMode Feedhorn, which would accept four LNBs.
Two for C-band, one for each polarity.
Two for Ku-band, one for each polarity.
The feedhorns and LNBs cost quite a bit, and perform quite well.
Advantages include the ability to use any cost/performance LNBs you like from $10 to $300, each! -
And, with four outputs, you feed 'em to a 4x4 or 4x8 multiswitch, and can run multiple receivers simultaneously.
A handful of members here, have such setups.

examples:
Chaparral Bullseye II feedhorn
ADL brand, ADL-RP3-2-2B, Dual C-Band / Dual Ku-Band Linear Feed
there are a few other brands, but these are the ones usually discussed
(I'm not recommending anything, just offering full disclosure)

 

[pendragon]

There is only one additional secret weapon, and that's what's called an OrthoMode Feedhorn, which would accept four LNBs.
Two for C-band, one for each polarity.
Two for Ku-band, one for each polarity.

There is also a simpler, super secret weapon and that is the single ortho feed. It only does C-band, but coupled with good LNBs it is either at the top of the heap or darned near. I could imagine that a fixed, single polarization feed might be a little better, but that's not particularly practical for FTA. A dual ortho is awfully good, too, but head-to-head on three different dishes of mine it could never quite match a single ortho's performance even with the same C-band LNBs. The ability to receive Ku may be worth the compromise, but if you want the hottest C-band feed a dual ortho is only close.