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universe

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Posts: 138
Reply with quote  #1 
If i install a LNBF would that cover the entire KU band frequency range 1070-12.75,and would that work on any FTA sat receiver..example  IF frequency.
Richard

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Posts: 176
Reply with quote  #2 
A universal Ku LNB covers that frequency range by using two LO frequencies, 9.75 and 10.6GHz and relies on the receiver to use 22kHz tone to switch between them. So as long as your receiver supports those LO frequencies, it'll work OK.

Regards,

Richard
universe

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Posts: 138
Reply with quote  #3 
What is the difference between an LNB & an LNBF ? What do you mean by universal KU LNB,is this a software or an actual LNB that covers 10.70-12.75 GHz? Your help is  greatly appreciated. THANK YOU.
Richard

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Posts: 176
Reply with quote  #4 
An LNB needs to be attached to a seperate feedhorn wheras an LNBF has the feedhorn built in.

If you look at Rick's page, you will see both and the  Octagon Optima shown there is an example of a "Universal" LNBF. Universal is the term used to describe these dual LO LNBFs that cover Ku low and Ku high bands - 10.70-12.75 GHz.

https://www.gofastmotorsports.com/rickssatellitelnblnbf.htm


Note that almost all LNBFs have the integrated feedhorn optimised for offset dishes, so if you're using a prime focus dish, you'll need to find a suitable LNB and feedhorn - Invacom make a reasonably priced combination (LNB + feedhorn) or an LNBF that specifically states it's for use with a prime.

Regards,

RichardOOCTAGON PLL Single OPTIMA LNBFCTOCTAGON PLL Single OPTIMA LNBFAGON PLL Single OPTIMA LNBF
Voltaic

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Posts: 406
Reply with quote  #5 
The internet has a wealth of information, a quick google search and voila https://www.multicominc.com/lnbs-what-they-do-and-how-they-work/

LNB = Low Noise Block down-converter
LNBF = Low Noise Block down-converter plus Feedhorn

I might be wrong but I've never heard of a LNB(F) that covers 11.70-12.75 with a single single band. That frequency range will usually need 2 local-oscillator in the LNB(F) which would be switch using a tone (LO1 for 11.70-12.20, LO2 for 12.20-12.75). No? 

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C-band: 7.5' Perfect10 / Pansat DP-4 Feed / 2x Norsat 3120F & 2x Zinwell PLL
Ku-band: Prodelin 1.8m Rx/Tx Future Project / RC2KA
Switches: WNC-4x8 / EMP 4x1 DiSEqC
Tuners: TBS6925, TBS6902, TBS5022SE, DSR-6000, Scopus IRD-2900, Cisco D9854

OTA: CM4228 / CM7777 / HDHomeRun EXTEND
Richard

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Posts: 176
Reply with quote  #6 
Quote:
Originally Posted by Voltaic
That frequency range will usually need 2 local-oscillator in the LNB(F) which would be switch using a tone (LO1 for 11.70-12.20, LO2 for 12.20-12.75). No? 


Yes, I mentioned that in post #2 above.
a33

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Posts: 89
Reply with quote  #7 
Quote:
Originally Posted by Voltaic
I might be wrong but I've never heard of a LNB(F) that covers 11.70-12.75 with a single single band.


But they exist. The're called "wideband LNBs", they cover 10700 till 12750 (whole KU-band?), and are often used in combination with Unicable/JESS multiswitches I believe.
LOF is 10.410 or 10.400 usually, I believe.

BTW Often the abbreviation "LNB" is used as a general term, including LNBFs. And I know an older professional still using LNC as the general term.
So using the term "LNB" does not always mean, that it has no feedhorn....

greetz,
A33
universe

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Posts: 138
Reply with quote  #8 
if i go with a multiswitch is this a difficult process to learn and is this expensive, i am a hobbyist so taking chances is part of OUR hobby,we learn as we go deeper into this.
a33

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Posts: 89
Reply with quote  #9 
When you don't have more than 4 tuners/receivers, I wouldn't use a multiswitch.
"Normal" LNBs would be quite sufficient.

Greetz,
A33
boblop

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Posts: 3,663
Reply with quote  #10 
A point with a multiswitch is if you have stored sat positions then you need to "program in" the path out to each dish from each sat receiver which uses the wired in path through the multiswitch. Another issue is most switches in line cause a small loss of signal passing through them. Here I do use the 4 port switches made by WNC. I use several ortho style feeds here and this is the simple way to go for me.

As stated most lnbfs come with a feed already installed and that creates the issue of which type of dish it was designed to work best with. Offset dishes may be round or elliptical. The angle of the feed horn can vary from dish to dish so attention to the small details is important.  And some of us try and put Ku feeds onto a prime focus dish some times.

Indeed it is an interesting hobby but to get best results from the equipment you have the learning about better ways goes on and on. My collecting of "the non standard" parts has slowed this summer but I keep an eye open for a part I may not have.

An ortho feed is common at cable company dish farms and is a metal waveguide which has two or more mounting locations for a horizontal and vertical placed lnb device. Could be C band or Ku band or even both on one metal device. You will not find much of the lnbfs at most cable companies.


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Never throw it away--cause guys need stuff--a lot of stuff

boblop

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Reply with quote  #11 
There are two examples of the non standard parts on EBay currently.

There is a vintage Cal Amp prime focus C band lnbf which means the feed horn and lnbf are attaches to each other and the lnbf is controlled by a pulsed signal to control the polarity passing through. I believe these would be a rare find today. An older unit but still perhaps worth owning.

The item I desire to own it the 5 Meter tri-fold trailer mounted mobile sat dish. Yes,. 5 meter portable. Nothing much to do with lnbf questions but worth giving a thought to owning one of these! This solves the HOA rule of no dishes in the yard. Just park in the street and open up the dish!

https://www.ebay.com/itm/CALIFORNIA-C-band-LNB-Wide-band-3-7-4-2-GHz-Satellite-Dish-Feedhorn-FTA-LNBF/202781105842?hash=item2f36b21eb2:g:Fr4AAOSwOfNdgUsf

https://www.ebay.com/itm/5-Meter-Mobile-Tri-Fold-Satellite-Trailer-System-Portable-Earth-Station/173842819824?hash=item2879d6eaf0:g:HjEAAOSw~p5ckR3R

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Never throw it away--cause guys need stuff--a lot of stuff

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Fellow Members, your posts are welcome here! Do not worry about posting everything perfect. Different receivers and LNB's will give you different Frequencies and Symbol Rates. Some set top boxes, PCI cards and USB receivers, Do Not Require all of the same information that others may need. It is not Required to post everything that others may need to tune in a feed. It is just most important to share the find. We can always adjust the Frequency and Symbol Rates and try the various Modulations and FEC's on our own receivers until we get a lock and then give a polite reply with what works for your receiver, as that information might help others as well. We all appreciate the efforts and energy of the Posters!

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