C-band LNB.

[biker_bob]

Not too sure if you got the answer you were looking for. I don't use a dish/horn as my signal here is good enough without one. This make things much simpler and pointing easier.
Basic format is take a 'normal' freesat set-up and swap the LNB for a C band one. It is that simple to start with. Point the LNB at the signal source, set up the receiver and bob's your uncle so to speak.

The biggest issue I had was tuning up. you need to know the LO frequency of the LNB and you might well need to know what LNB LO the receiver is expecting. Some receivers allow you to set the LO frequency and some, like mine, don't so you need to do some maths.

Example...
The C2PLL LNB has an LO of 5150MHz
Most freesat receivers expect it to be 9750MHz
I don't recall the maths I need to do at the moment, what I do know is that I needed to tune the receiver to 11492MHz to receive at 3.408GHz
Hopefully somebody will comment with the equation, I know I spent a while with a lot of paper to get my head around it.

You may also need to set up the symbol rate (whatever that is) to match the signal source.

To get mine all sorted I got a mains inverter, loaded all the kit in the car and drove to the local repeater, GB3HV, so that I could test the kit without having any issues with signal strength. Once I KNEW the kit was set up and working I went home and knew that the ONLY reason for it not to work was poor antenna position.

Hope this helps in some way.

[G8DKC]

While on my quest for C1W-PLL C-band Satellite LNB without dish, I came across this on, I think Brazilian YouTube video.

It's Model No is FH-C63 or maybe FH-C83 snagged from video.

Anyone seen anything like it before, seems popular in South America, difficult to get onto their websites.

Pictures attached...

Peter

[M0DTS]

Looks like a polariser to get from Linear to Circular.
My 23cm EME feed is like the VE4MA feed seen in this link:
http://www.vk3um.com/DUAL%2070%20and%20 ... 0FEEDS.pdf
You can see the 5 posts on opposite sides there too with two probes, one for RH and one for LH circular.

Rob

[biker_bob]

Mostly putting this here so I can find it again.

That calculations for tuning a satellite receiver where the receiver has the LO frequencies already calculated in. EG, if your free to air receiver looks like it tunes to frequencies like 10000 (10 gig) and you want to use it without an LNB or a non stock one then this is what you need.

The LO of the LNB you have - the frequency you want to receive + the lo of the LNB your receiver is designed for (normally 9750) = the frequency you need to tune the receiver to.

Example...
My new LNB has an LO of 5150MHz
MY satellite receiver is expecting a normal LNB with and LO of 9750MHz
The local repeater is on 3408MHz
So...
5150 - 3408 + 9750 = 11492
So I tune the receiver to 11492 and there it is.

If you want to receive without an LNB, eg for 12cm) the math is a lot simpler. It's simple the frequency you want to tune to + the stock LNB frequency.
Example...
To get 1255MHz on a normal receiver its...
1255 + 9750 = 11005
So I tune the receiver to 11005 and there it is.

The math is a bit different behind it as the LO's are high side for most LNB's. I'm sure there is a generic sun that would do it all with a LO of 0 (zeor) for direct reception but I can't work it out at the moment.

[g8gtz]

Bob,

Good info but probably better placed on the wiki (reference library) - I'll set it up over there.

Edit - first draft here: https://wiki.batc.tv/Satellite_receiver_tuning_offsets

Noel