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Very basic cabling/distribution advice needed please
In article , David Woolley
wrote: R. Mark Clayton wrote: There should be loads of signal* and, assuming that the aerial has more than one element , no need for amplification in the landlord's demise. You probably won't need it in yours unless the landlord's split is rubbish. A landlord should use a system with more isolation between outlets than is required within a single residence. That is typically done by using taps with upwards of 10dB attenuation. You have 200kW at ~8km whereas I have 100kW at 30km, so you have 30 times more signal or nearly +15dB before you start. You also have channels at the bottom of the band, which means less loss in your cable runs. He also does not have line of site on the transmitter. in the mid 70s, I was involved with the BBC stand at IBC in Grosvenor House, Park Lane; about 11km from CP. To get signal to the basement from the roof top 8 stories up needed a full 100m drum of coax. Even so, 20dB of attenuation was needed to bring the signal down to a useable level. There's lots of signal up there, -- From KT24 Using a RISC OS computer running v5.18 |
Very basic cabling/distribution advice needed please
In article , says...
In practice nowadays it is quite usual to use four-way splitters to provide four feeds. These might or might not be fed from a tap-off line via low value taps (eg a 12dB tap feeding a four way split = four 20dB taps). All very old fashioned nowadays of course. New terrestrial-only systems are very rare. Not as rare as the one I've just designed - it only has three channels and they are Channels B1, B9 and E33 ...! https://www.dropbox.com/s/u3ugihyq7kjf0hu/Dulwich_% 20New_Headend_V1.1.png or http://tinyurl.com/new-headend The RF design is he https://www.dropbox.com/s/ba52mnd210...Draft_V2.0.png the 'shed' is ~10m x 8m and there is a possibility of expansion to double that size! The minimum output at any outlet is 2mV as most of the 'residents' are very old and tend to be rather 'deaf' ... You will also note that they tend to gather together in large groups ... -- Terry |
Very basic cabling/distribution advice needed please
On 30/12/2012 18:57, R. Mark Clayton wrote:
Snip Well the main thing is that they should not be daisy chained. The sequence should be: - W aerial | V wall socket | TV amp [optional see text] | toys PVR, DVD, $ky box etc. | 4 way splitter | | | | TV TV TV TV The four way splitter should be a reactive one (e.g. from Maplin£10). If you do not want to view the output of your boxes elsewhere then put them after the splitter and in any event use HDMI, component or SCARTs to get the output into your main TV. Test each TV / box individually on the incoming UHF to see they will search correctly. If the divided signal is insufficient so they won't work after the splitter, buy a cheap UHF amp and insert it before any boxes. If you are replacing cable(s) use CT100 or similar and keep the runs short and the joins to an absolute minimum. As it happens the arrangement in my flat is similar. We are ~30km from Winter Hill. The feed from the aerial goes to a [landlord's] six way amp for the 6 flats and then in my flat the arrangement is as above without the optional amp. In the smaller block the landlord's splitter is passive. Works fine. If you are not using the analogue signal in you main TV, then you can use two two way splitters. One signal (-3dB) from the first can go to your weakest device (probably the Freeview HD TV) and the other to the splitter for the other two (-6dB) and no aerial goes into the main TV. How far are you from Crystal Palace? Hi sorry to bug you again but can I just make sure I understand this right before I go ahead and start buying stuff. I have no interest in feeding Sky or anything into other rooms it's just getting best TV signal to each TV point (living room, desk and bedroom TV's), I will be buying CT100 coax of some form having looked at your site it would seem the Type B would be best for me as it may well get bent to some degree (another problem I have some is at 90 degree angle but I won't be doing that again). I have looked at Maplins and they don't seem to offer 4 way UHF splitters for normal coax plugs (only F type) however I was wondering given my living room TV is only a few feet away from the socket would it be best to put a 2 way slitter in place first (which i can get from maplins here http://www.maplin.co.uk/uhf-tv-signal-splitter-955) run one lenth of coax to the main TV (non amplified as i'm worried about overloading the TV) then my old amplifier boosting signal to desk TV and bedroom TV or is my old booster just fit for the bin now? Also any links/advice you can give me on where to buy the kit and looking at your site it could well be a minefield out there. |
Very basic cabling/distribution advice needed please
Jim wrote:
I have looked at Maplins and they don't seem to offer 4 way UHF splitters for normal coax plugs (only F type) So use 'F' plugs on the splitter end of the cables, they're dead easy to use, keep a Belling Lee on the equipment ends. Instead of £1.99 each from Maplin, they're £1.84 for 10 at Toolstation, the 4-way splitter's half the price too http://toolstation.com/shop/x/x/x/d190/sd3084/p16238 http://toolstation.com/shop/x/x/x/d190/sd3084/p38324 |
Very basic cabling/distribution advice needed please
On 01/01/2013 19:57, Jim wrote:
I have looked at Maplins and they don't seem to offer 4 way UHF splitters for normal coax plugs (only F type) http://www.satcure.com/tech/fconn.htm http://www.ebay.co.uk/itm/F-Socket-Adaptor-to-Male-Female-Coax-Adaptors-F-plug-/350107455031?pt=UK_Sound_Vision_Other&hash=item518 407ce37 http://tinyurl.com/avqkjaf -- mailto:news{at}admac(dot}myzen{dot}co{dot}uk |
Very basic cabling/distribution advice needed please
Andy Burns wrote:
Jim wrote: I have looked at Maplins and they don't seem to offer 4 way UHF splitters for normal coax plugs (only F type) So use 'F' plugs on the splitter end of the cables, they're dead easy to use, keep a Belling Lee on the equipment ends. Instead of £1.99 each from Maplin, they're £1.84 for 10 at Toolstation, the 4-way splitter's half the price too http://toolstation.com/shop/x/x/x/d190/sd3084/p16238 http://toolstation.com/shop/x/x/x/d190/sd3084/p38324 Or CPC on line. http://cpc.farnell.com/_/344004/spli...mhz/dp/AP01023 Definitely use 'f' connector splitters. Much better. Bill |
Very basic cabling/distribution advice needed please
alan wrote:
On 01/01/2013 19:57, Jim wrote: I have looked at Maplins and they don't seem to offer 4 way UHF splitters for normal coax plugs (only F type) ******** to Maplins. Ridiculous prices. Bill |
Very basic cabling/distribution advice needed please
Bill Wright wrote:
alan wrote: On 01/01/2013 19:57, Jim wrote: I have looked at Maplins and they don't seem to offer 4 way UHF splitters for normal coax plugs (only F type) ******** to Maplins. Ridiculous prices. Bill and ridiculously few product lines Better off with RS http://uk.rs-online.com/web/ or CPC http://cpc.farnell.com/ or even eBay Steve Terry -- Get a free GiffGaff PAYG Sim and £5 bonus after activation at: http://giffgaff.com/orders/affiliate/gfourwwk |
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