Thread: Linear\circular LNB Question

Originally Posted by MrFTAMan

Dang!!! ....
I really am disappointed with the linear/circular LNBF....

I remember some negative comments (on maybe that unit) in the past, but this is pretty tragic.
Would you mind making up a little review ?
Then, we can point to it the next time someone gets that LNB.



Perhaps some signal reports on both the review LNB and any normal one you care to use for comparison.
Then, if we can dig out some of the previous comments, we can link to them, too.
Might as well turn this exercise into something positive.

Originally Posted by MrFTAMan

Dang!!!
i went outside and swap the LNBs (from the DGL-1189S Ku Twin LNBF to the standard 10750 LNBF) and the difference is HUGH!
I get all of G19 Tps with high quality readings. I decided just put a Dishnet dish to get NASA, etc.
I really am disappointed with the linear/circular LNBF....

Yup, it has a noise figure of 0.5, while most of recent ku lineal LNBs have 0.2 or even 0.1, a universal Ku LNB usually has 0.3 db.

It doesn't seem like a lot of difference but as you experimented, it can be a lot .

In the other hand, DBS signals can be so powerful that even with a colander we can get them... not really but you get my point .

Specifications (might come in handy if someone wants to know):

Cheers

M.

Originally Posted by Anole

I remember some negative comments (on maybe that unit) in the past, but this is pretty tragic.
Would you mind making up a little review ?
Then, we can point to it the next time someone gets that LNB.

Perhaps some signal reports on both the review LNB and any normal one you care to use for comparison.
Then, if we can dig out some of the previous comments, we can link to them, too.
Might as well turn this exercise into something positive.

I don't know if I want to give a negative review on that LNBF. I got it from Ebay because I wanted to get a LNBF that can receive both circular and linear signals.
I paid $18 with free shipping.
I wondered why no one was mentioning anything about these LNBFs.
The problem with this unit is that it does receive the NASA and ION channels on 119W but lousy on other the linear Tps. I couldn't receive any HD channels!
Well, that is one lesson I learned this week, along with how not upgrade a FTA receiver...

Mikhel, I guess I need to pay close attention to the noise figures on any LNBFs. Thank you for bringing that out to me.

The thing with that lnb - It works for what it was designed for - reception of 118w/119w

I actually did some experimenting with this lnb, to bad I didn't save the numbers. But as stated before, performance with regular linear tp's was less then good.

I had the same issue with one of those so called "circular/linear" units...its designed for hackers

I gutted it and made it a regular linear LNB
http://www.satelliteguys.us/1044115-post34.html (Digiwave L/C invacom competitor)

Originally Posted by Mikhel

Yup, it has a noise figure of 0.5, while most of recent ku lineal LNBs have 0.2 or even 0.1, a universal Ku LNB usually has 0.3 db.

It doesn't seem like a lot of difference but as you experimented, it can be a lot .

no offense but I've tried some .5 LNB's and they worked BETTER than a so called .3
For a while my old ExpressVu LNB (when they were linear) I used. It was a .7 or .8 LNB and it blew the doors off a .5

Stability is what is really needed

Oh yeah, no offense taken , there are some good brands that make 0.5 db LNBs that really blow other brands appart, from what i remember Eagle Aspen has good LNBs, so does Invacom and Norsat (i do believe even Zinwell has good LNBs), there are other brands that have 0.3 or 0.2 but their stability is trough the floor (i've never had good experiences with Fortec LNBs for example, nor some newer Chaparral).

I do not know what part of the specs. tells us about the stability. I've seen it mostly with C Band LNBFs, older ones even with a higher noise figure have more stability than newer LNBFs with lower noise figures.

Not so long ago i read there are also some LNBs made specifically for elliptical dishes and some for circular dishes, well, thats what i found out not long ago in a british webpage, but i don't remember it pretty well so i might be confused, if i find the webpage again, i'll post the link, it has some pretty interesting stuff.

I remember that thread you made some time ago talking about that LNB with low frequency, it's not necesarily made for hackers since in México and most of latin america (and i believe also Japan) they use this kind of LNBs for their DTH services, most notably "Directv Latino", with headquarters in Venezuela.

Those LNBs have the frequency at 10500 but can't give you as much gain and stability as a "normal" circular, they aren't really lineal/circular, altough some are being marketed as such.

M.

Originally Posted by MrFTAMan

I paid $18 with free shipping.
I wondered why no one was mentioning anything about these LNBFs.

Well, that's just the point, it was discussed in a thread very much like this.
But nobody made a review of it, and so it was pretty much forgotten.

Iceberg's link above, is probably the thread I'm thinking of.
I remember considering it a brain teaser, and tried to think of a good use.
More interesting things came along, though.
Too many satellites; too little time. -