Sky HD long cabling question

sieade245

Standard Member
Hi, I've recently bought a Sky HD box, dish and viewing card. I live in a block of flats on a Navy Base. I am not allowed to make any permanent modifications to the accomodation, including bolting Sky dishes to the wall! However, i have found a suitable site for my dish at the end of the block, unfortunately, the distance between this site and my room is about 45-50m.

I have spent a few hours trawling through posts on here and other web sites investigating what kind of cable i will require. I will run the cable along the ground externally, down the side of the flats. The cable will also have to pass through an open window (no drilling into the walls!) before it connects to my box.

As far as i can make out, i have two options for a cable run this long : WF100 twin or two lengths of WF125. Cost is not really a factor, my main problem is this: WF125 will provide me with lower signal loss over the distance, however i have read it is quite a rigid cable and so arranging it through the open window may be difficult. Another option is to solely use the WF100 from the dish to box, offering greater flexibility but higher signal loss. My third idea is to use WF125 from the dish to outside the window and then use a WF100 extension lead to transfer the feed through the window and to the box.

I live in Cornwall and i have bought the larger 60cm minidish to provide greater signal at source.

1. Will i get away with just using WF100 cable all the way (with the larger dish?). When i say get away, i mean be able to receive all transmissions in all but the worst weather including HD.

2. If not, will WF125 cable be hard to work with when i have to put it through the window and into the box, just underneath the window.

3. The best option (i think), is using the extension cable - will the fact that i am putting a break in the cable at the junction affect the signal so much that it would just be better using one run of WF100 twin?

I have tried to find out as much as i could before posting this as i know the same questions get asked again and again. I would really appreciate some ideas from you guys before i go and spend half the price of the box on cable!

Cheers, Si
 

chrise

Active Member
Si

50m is a long run for a satellite box where the signal level at the lnb is pretty low and at a fairly high frequency. General rules is avoid any joints and to buy the best cable you can afford (ie the one with the lowest signal loss) which here means WF125. You may well need an inline amplifier (must be designed for the job as the cable also carries switching voltages and tones) which you can buy from specialist suppliers. www,satcure.co.uk is a helpful site with loads of information and reasonable prices but there are others.
 

sieade245

Standard Member
Chris, thanks for the response. I reckon you're right about the amplifier. I will order one too. Looking at the cable specs, i will lose about 13-14 dbs on a run of 50m WF125. Satcure's guide says to insert an in line amp when your signal drops by about 15dbs. This seems to imply inserting the amplifier at the end of my cable run. But then Sat cure also says that the amplifier should never be inserted at the end, rather at the beginning of the run (makes sense, otherwise the noise picked up in the cable run would also be amplified plus could damage receiver with too high a signal).

Anyone have any ideas on ideal amp placement? Of course, this will mean that I have to have two breaks in the cable now, at input and output to amplifier. I'm thinking that it would be best right at the beginning, to give me a high(er) initial signal before any noise is picked up by the cable.

Cheers Si
 

nigelbb

Distinguished Member
I wouldn't bother with the signal amplifier as they can be more trouble than help as they introduce noise. A 50m run of good quality cable without joins will be perfectly OK. A couple of years ago as an experiment I connected up a digibox to the dish via a 100m reel of CT100 & reception was fine.

It is however most important to ensure that you have a good signal in the first place & that means don't use a minidish but a decent 60-80cm one. The larger the better.
 

sieade245

Standard Member
Cheers Nigel, I have decided to go with the WF125 cable. I will use two runs of the stuff and it will just have to fit through the window somehow! If this does not work, i will think about inserting some amplifiers then. Setting it up at the weekend, will let everyone know how it turns out.

Cheers Si
 

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