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Never tried that distance myself but I don't think you can buy more than 100meters on a normal roll from a high street retailer. Might have to go to a specialist.
You will also need the best quality cable you can get as signal loss over that distance will be high, plus voltage is required to change polarity so you may suffer from voltage drop.
Sorry can't be of more help but hopefully an expert will be along soon.
There will be a mathmatical equation for this but a lot depends on what signal you start with and the quality of cable you use.
CT100 cable ( a regarded high spec) is something like 29db signal loss per 100mtr..
Starting with a larger dish will improve the gain, then a good quality cable. However most rolls are sold in 100mtr and putting a join in will add to the loss.. You can buy a 250mtr drum but that increases the cost...
So go buy a big roll and give it a go .. You can always sell on the surplus cable..
PS.. Make sure you get the right F connectors as well, CT100 is a bit thicker...
pps.. The amp listed by Karlb is fine and a bargain.. If you do use one it's usually located a 1/3 of the way down the cable from the receiver ( if my memory is working right..)
Last edited by tonka on Tue Jun 28, 2011 9:56 pm; edited 1 time in total ______________________________________________________________ Steve Tonks...
Yes well I have not played with that length... rg53 for example is about half an inch in diameter and thus heavy and then you'll need the N type conectors..... its just best to play your self and try normal sat cable the (IF) frequency from the LNB to your receiver is around 900Mhz...... PCandSatguy is the person to ask as he's well into that... if you were thinking of useing an inline amplifier conect it at the lnb end and not the receiver end....
There's no point in increasing the size of your dish as that is for the the down link at 10Ghz your losses are at (IF) from the lnb to your receiver.... just my view...
you were thinking of useing an inline amplifier conect it at the lnb end and not the receiver end....
There's no point in increasing the size of your dish as that is for the the down link at 10Ghz your losses are at (IF) from the lnb to your receiver.... just my view...
Clive... Not correct, the signal at the LNB will already be at full strength and the loss comes as the signal moves down the cable.. Hene the need to located about 2/3 down from the LNB. This boosts the signal level back up..
A larger dish will help as it will ensure a stronger or full strength to start with. This is the very reason why sky had Zone 1 and 2 dishes of 43 and 60cm to compensate for lower signal strength away from the main beam, ie in Scotland..
I think for cost of a roll of CT100 give it a go.. I cant remember the longest that I have ever run, been out the game a long time now...
______________________________________________________________ Steve Tonks...
ok fine, just I dont like amplifing signal plus noise just a clean signal and have a good fat signal to start off with, still just my view each to their own I guess..... yep the dish size is all to do with the 10Ghz down link gain and foot print gain/ dB volts at the dish. Interesting subject thou..
Stuck in the woods? In the UK? have you tried the terrestrial signal? Easier to get through foliage I would guess. Aeril and freeview digibox for less than £30 (if you can’t borrow one) to try out.
I’m no expert and am probably talking nonsense.
Dick
______________________________________________________________ Powys, Paradwys Cymru
"Rules are for the guidance of wise men and the obedience of fools." Douglas Bader CBE
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France
You can always sell on the surplus cable..
yep the dish size is all to do with the 10Ghz down link gain and foot print gain/ dB volts at the dish. Interesting subject thou..
