dxsat
Regular Member
- Joined
- Jun 22, 2005
- Messages
- 745
- Reaction score
- 70
- Points
- 28
- Age
- 69
- Website
- skyinmadrid.com
- My Satellite Setup
- Snap's setup: (In Spain) Humax HDR, Prodelin 1.8m dish + Invacom QDF-031 + CM feed, (In UK) CallFlow VDSL + EE 4G, Sky Q, YouView HD, Mac OSX, iOS
- My Location
- UK: Tonbridge, Kent. Spain: Madrid.
Like many people, I have become baffled and annoyed by conflicting reports on which LNB is better for fringe reception. I decided to run a series of tests for myself, and try to do them in as thorough a way as possible. Some forum members are actually selling the LNBs they recommend, through their online shops...
Here is the first test, on the Invacom Quad C120LNB, used extensively in weak signal areas. There is an ongoing discussion amongst the Cyprus members as to whether there is any difference between the four ports on the LNB.
As you can see from the charts, there is a measureable difference, but only on horizontal high band. On Vertical high band, the outer two ports seem to have the edge. On low band, as used by Astra 2D, the margin between the ports is smaller.
The tests were carried out on 13th October 2006 at 17.00 hours CET, using the new Lacuna / Wolsey Satmeter 3. The LNB's were fitted to a 1.8 metre Prodelin offet fibre- based dish, with a ChannelMaster Feed. Skew is 24 degrees.
All strength bars are out of 10
The meter has two signal strength (SS) bars, the first a crude measure, the second one much more sensitive. Picture quality is as you would expect, with an addition numberic value, which I've included.
The Wolsey meter needs to be calibrated to the conditions you are working in.
The next test I run I'll use an equal calibration value. (Calibration is just another way of turning up the sensitivity.)
I used three Quads from the same batch, to get a reliable result.
Coming next.. Extreme threshold test: Sharp v. MTI v. Invacom ...the results were surprising, and there was a clear winner
Here is the first test, on the Invacom Quad C120LNB, used extensively in weak signal areas. There is an ongoing discussion amongst the Cyprus members as to whether there is any difference between the four ports on the LNB.
As you can see from the charts, there is a measureable difference, but only on horizontal high band. On Vertical high band, the outer two ports seem to have the edge. On low band, as used by Astra 2D, the margin between the ports is smaller.
The tests were carried out on 13th October 2006 at 17.00 hours CET, using the new Lacuna / Wolsey Satmeter 3. The LNB's were fitted to a 1.8 metre Prodelin offet fibre- based dish, with a ChannelMaster Feed. Skew is 24 degrees.
All strength bars are out of 10
The meter has two signal strength (SS) bars, the first a crude measure, the second one much more sensitive. Picture quality is as you would expect, with an addition numberic value, which I've included.
The Wolsey meter needs to be calibrated to the conditions you are working in.
The next test I run I'll use an equal calibration value. (Calibration is just another way of turning up the sensitivity.)
I used three Quads from the same batch, to get a reliable result.
Coming next.. Extreme threshold test: Sharp v. MTI v. Invacom ...the results were surprising, and there was a clear winner