Multi LNB Disesqc 13E, 19.2E, 28.2E equipment

[duglish]

I can only go of my own install on a Zone2 using Original Zinwell quads i get 19.2? and 28.2? fine and also 13? east although the weaker tp's on 13 are hit and miss but it gets me the channels i want.

I may as well use the other dish on house.. So should probably buy a new LNG and disesqc what transponders are weakest on 13e and 19.2 to check if install is correct? Thx

[duglish]

Also which disesqc could people recommend

[digicon]

Also which disesqc could people recommend

the One ramjet quoted is decent its a copy of the Head blackpanther edition but still very good, also consider the Technomate as well again quite good.

Also when measuring signals please remember that when going through a diseqc switch you will lose around 2db per output so take this into account when its connected to your receiver.

[billybob69]

I've started to research whether it is possible to get 28.2e + 23.5e + 19.2e + 13e on a 80cm dish and found this thread.
The dish is a 80cm sky / raven dish with a home brew multi LNB bracket. I had pretty much realised that in order to get 28.2e and 23.5e together that I would have to use bullet nose / ALPs LNB's, then I saw this comment -

no you need bullet nosed LNBs like these and they are not really suitable for use on a sky dish as the feed horns are suited to circular type of dish.google ALPs lnb.

Has anyone managed to get 28.2e + 23.5e + 19.2e + 13e on a 80cm dish? Furthermore has anyone used ALPS LNB on a sky / raven dish?

Thanks in advance for any replies.

bb69

[digicon]

You will also need to do some DIY to the LNB ARM length as the official zone 2 dish is ideal for Multisat but the arm length is way too short

[happy_highlander]

I have only just managed to get those 4 sats with standard inverto blacks on an 88cm with 23.5 and 28.2 pretty much touching so you'd definitely need bullets/alps on an 80

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[billybob69]

You will also need to do some DIY to the LNB ARM length as the official zone 2 dish is ideal for Multisat but the arm length is way too short

I did some bodging on the arm to get the mulit-LNB holder to fit. I had to cut / grind out a piece of the arm and then drill a new hole. From that I am able to get a watchable signal from 3 LNB's - 28.2e, 19.2e & 13e (with the dish centred on 23.5e) without having to lengthen the arm.
Having said that I get an "LNB Overload" message from my Sony TV and a similar faulty LNB message from my Technomate receiver when on some of the 19.2e channels. Could those error messages be to do with the arm length / LNB's too close to the dish?
Bracket 1.JPGBracket 2.JPG

bb69

[digicon]

I doubt it has anything to do with the Arm length, could be something to do with the diseqc switch, also re-position the main focal point to somewhere around 16? east as 19,23,28 have a far stronger signal than any of the birds at 13? east

[billybob69]

The "LNB overload" message was received when connected the TV / receiver directly to the 19.2e LNB, not via a Diseqc switch (getting to work via the Diseqc switch is - whole different - problem, that I need to solve. Grrr), therefore I assumed that the error message was something to do with either a large dish and / or a short arm.

Unfortunately, the channels that are needed are some of the weakest (Horse & County on 28.2e and Class Horse on 13e) and the sat is in an area which sees quite a bit of heavy rain. That is why I centred on 23.5e, although I might have got away with centring on 19.2e.

I'll give a 28.2e + 23.5e + 19.2e + 13e on ALPS LNB's with a 80cm Sky / Raven dish a go and report back.

bb69

[digicon]

Mine is focused on 19.2 east but i should really get nearer to 16 east so that the few weaker TP's on 13 east dont go off in heavy rain all the rest i dont have a problem with, I also use just a standard no name iss 80cm dish with 13-19-23-28 with smart quad bullet nose lnb's and i never have a problem with anything on 23 or 28 even the weaker ones in any heavy downpour.

you should lengthen the LNB arm as this will offset the focus a little and give you a wider spacing on the LNB's on the Zone 2 dish

[billybob69]

you should lengthen the LNB arm as this will offset the focus a little and give you a wider spacing on the LNB's on the Zone 2 dish

What length should I lengthen the LNB arm too?
Out of interest, I'm guessing that there is some science behind the length of the LNB arm, but never read anything on it. I'm assuming that the LNB arm should be in some proportion to the size of the dish. I'm guessing that the further the LNB's are from the dish (within reason), the more accurate the signal is when it bounces from the dish to the LNB?

[digicon]

You can play about with the dish arm length get something with an adjustable bolt in the middle so you can slide up/down, the further away from the dish the more spread you have positioning the LNB's