LNB-LNBF??

Status
Please reply by conversation.
ACRadio

ACRadio

SatelliteGuys Pro
Apr 25, 2006
794
2
Near Asheville NC
Whats the differance?

I wrote this a few years ago in response to the same question on another forum...

"In the early days of C band, the two most critical components of a satellite system were the downconverter and the LNA, or Low Noise Amplifier. The next generation of systems went from the single conversion downconverters to block downconversion. The LNA and block converter were joined either by a piece of low loss coax or an "N connector" coupler. A way to counter the loss between the LNA and the downconverter led to the joining of those two devices, called a Low Noise Block converter (LNB). A waveguide is a metal channel that "guides" the signal from the opening at the mouth of the feedhorn to the pickup probes in the throat of the LNB. Just like coax, waveguides can be lossy, so a way was developed to counter this loss by joining the LNB together with the feedhorn into a single Unit . This is what we know today as an LNBF , or Low Noise Block converter Feed."
 
Anole

Anole

SatelliteGuys Master
Sep 22, 2005
11,819
13
L.A., Calif.
To expand on that a little . . .

An LNBF is an LNB with a feedhorn attached. (examples below)
Most modern Ku hardware you find are LNBFs, but are often just called LNBs (because we're sloppy conversationalists). :D

LNB and LNBF Invacom Ku, product available both ways
AF-120 optional feedhorn for above

C band LNB, needs to be bolted to a proper feedhorn to work
Ku band LNB, needs to be bolted to a proper feedhorn to work
feedhorns without LNBs attached (Chaparral site; worth exploring)

C band LNBF, even includes the scalar ring
C-band LNBF, bandstacked, available with or without the scalar ring.
 
E

elam budmore

Thread Starter
Well-Known SatelliteGuys Member
Sep 22, 2008
27
0
sheboygan falls wi
HUH??

Im not sure i understand.. one of my dishes, has what looks to be a all in one feed horn and scaler ring, the other one has a adjustable scaler ring, does that have anything to do with the differance between a LNB OR LNBF??...I just purchased a new LNB?? PANORAMA -#ER863 this says..."15k C-LNB on the box, this is what the "F" type cable or what ever attaches to. im having a hard time finding sattalites with a tv out at the dish, what im using is just a regular antenna feed type cable from the LNB from the dish to the reciever, could this be a problem?
 
truckracer

truckracer

SatelliteGuys Pro
Sep 17, 2004
4,338
351
Charleston wv
You should use RG-6 coax for your cabling.
Lnbf's don't have a servo motor mounted on the feedhorn. Servo motors are usually little blue square boxes that have a red, black, and white wire going to your analog receiver to move a little probe inside the feedhorn to change from Horizontal to vertical and vice versa.

An lnbf does this electronically with varying voltage on the coax. Like the little lnbf's work on Dish and Direct tv satellite dishes.

Both types of feedhorns are still adjustable within the scalar ring so you can match the Focal distance on your dish and get the best signal. That adjustment is critical to your reception.

Lnbf would be the most simple and straight forward to use for a beginner.
 
E

elam budmore

Thread Starter
Well-Known SatelliteGuys Member
Sep 22, 2008
27
0
sheboygan falls wi
Thanks Truck racer, both of my units have the servo motors. what happend if im using non RG-6 cable for a 20 ft run from the dish to the tv? little or no signal??
 
S

SatPhreak

SatelliteGuys Pro
Apr 19, 2007
943
139
Thunder Bay, ON
Sometimes rg59 works, sometimes it doesn't. You can get rg6 in short lengths pretty much anywhere. Anywhere that sells sat receivers, even places like Radio Shack or Walmart.
 
Status
Please reply by conversation.

Similar threads

turbosat
Replies
3
Views
2K
turbosat
turbosat
Andyboy90
Replies
15
Views
2K
luke rizzuto III
luke rizzuto III
esteveW
Replies
10
Views
3K
esteveW
esteveW
emuman100
Replies
9
Views
7K
Anole
Anole
J
Replies
5
Views
2K
DK_Sat
DK_Sat

Users Who Are Viewing This Thread (Total: 0, Members: 0, Guests: 0)

Latest posts

Top