Linear and Circular

[so close]

Hi everyone,

i got a question about circular and linear lnb. I hope someone can give me some info on your experiences or knowledge about it. I hope my question is that confusing. Thanks in advance.

I read that to get Vietnamese channels the lnb need to be linear and a big dish. Let says, if i have a Invacom QHP-031 LNB, which is circular and linear. With quad output, 2 for circular and 2 for linear.

So, how would I set that up so the receiver will get both linear and circular?

does the receiver automatically know when the signal is circular and when is linear??

And do i just run 1 cable from the diseqc switch directly to the receiver or what?

Thanks.

[rainman]

when you set up the receiver for a linear sat you will either set it for disqec port 1 or port 2. depeneding which lnb you have on these ports then when you go to a circular sat it will know which port you have designated for circular sats and which one you have designated for linear sats mine is set to port 1 for linear and port 2 for circular sat. and yes this will come to the receiver from the disqec switch on one cable. also if you are using a motor make sure the disqec switch is between the lnb and the motor.

[bill190]

You can have C-band, Ku-band, Linear, or Circular.

Before trying to receive any of these, you would need to go to lyngsat.com and look at a specific satellite. See if the channels are C, Ku, linear, or circular.

C-band is a 4 digit frequency.
Ku-band is a 5 digit frequency.
Linear will say H or V.
Circular will say L or R.
(R=V L=H if using a circular LNB)

The same satellite can have any mixture of the above.

But for each satellite listing you have on your receiver, you can only have a setting for one band and one specific LNB.

I receive both C and Ku. So I have satellites listed twice in my satellite list.

Like...
Galaxy nn C
Galaxy nn Ku

Then to receive C from that satellite, in the setup for that satellite listing, I tell the receiver what LNB to use, what L.O. frequency to use for that LNB, and what connections to make via diseqc or 22 kHz switches to connect to that LNB. Then for each frequency listed for that satellite listing, I will also specify if the frequency is H or V. (R=V L=H if using a circular LNB)

So you can do the same with a circular LNB. Use a diseqc switch to connect linear and circular, then say which to use in each satellite listing. Usually diseqc 1.0 LNB-1 would be LNB-1 on the diseqc switch, and diseqc 1.0 LNB-2 would be LNB-2 on the diseqc switch, etc.

So you could connect LNB-1 to linear and LNB-2 to circular on the LNB. Then for linear satellite listings, say to use LNB-1. For circular, say to use LNB-2.

[wejones]

Originally Posted by bill190

You can have C-band, Ku-band, Linear, or Circular.

Before trying to receive any of these, you would need to go to lyngsat.com and look at a specific satellite. See if the channels are C, Ku, linear, or circular.

C-band is a 4 digit frequency.
Ku-band is a 5 digit frequency.
......

Pretty soon, this rule of thumb isn't going to work. Ie there are now a few Ka band sats up there, I don't think that Lyngsat has any Ka info yet, but that will change. {EDIT: I see that Lyngsat has some data on Spaceway 1 at 102.8. That's a Ka sat.}
There are also L / S band sats up there, but they don't appear in Lyngsat either, since they are usually weather or telephone, etc, not video.

But to differentiate Ku from Ka, both of which have 5 digit, I copied the following from the AMC web page (AMC 15 and 16 both have Ka capability).

Originally Posted by ses-americom

C-band is characterized by larger antennas and is preferred by a variety of full-time service providers. C-band ("compromise" band) is a portion of electromagnetic spectrum in the microwave range of frequencies ranging from 4 to 6 GHz -- normally downlink 3.7–4.2 GHz, uplink 5.9–6.4 GHz.

Ku-band services generally use smaller antennas and have become more common for home use. The Ku-band ("kay-yoo" kurz-under band) frequencies ranging from 12 to 18 GHz.

The new Ka-band frequencies represent the leading edge for advanced services. The Ka band (kurz-above band) ranges from 18 to 40 GHz.

[so close]

appreciates for all the good infos guys. Thanks a lot.