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All posts by Andy Ripley

Below are all of Andy Ripley's postings, with the most recent are at the bottom of the page.


Freddie Sear: Try not using the plug in network adapters, and if it goes back to normal connect the units together with normal networks cables. It could be these network over the mains units are creating a lot of noise and it's densensing the receivers.

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GB

Channel 5, Channel 5 + 1, 5*, 5* + 1, 5USA and 5USA+1 have now appeared in my Freesat programme listing as of yesterday

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GB

Just have the SD box, can't help but I suspect the HD versions are encrypted to tie you into Sky.

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GB

Keith: You can't split the feed from an LNB. You'd need a multiple output LNB to the cupboard and 3 runs down, then a seperate feed off to each room.

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GB

With this sort of cutting up of the band I would suspect that the long term aim is to eliminate terrestrial TV altogether. Even with "lite only" repeater stations it will become more difficult to allocate Muxes, and with "HD" likely to become the norm, then there won't be room.
Receiver desensing is going to more of a problem in fringe areas, with 4G signals swamping amplifiers. It's a recipe for a long term decline of a universal service.

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GB

I can see the biggest problem about the ITV licence renewals being the lack of competition. Gone are the days when there were numerous bidders, they've all been swallowed up and become ITV plc. I expect them to downgrade their regional content, after all it costs money and they're struggling for revenue. As for the public service element, watch them wriggle out of any commitments.

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GB

There's software out there that models propagation and gives a likely coverage, however they are not using a single omnidirection antenna, they are using array and they don't (as I have found) radiate evenly. It's this vital information that they hold back.
Yes it would be nice to have it, but it would show possibly a nice null on several of the muxes in my direction from Bilsdale. The signal strength is well down on several muxes even comparing them on the Spectrum Analyser connected to the antenna.

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GB

From HG4 1UP today the Muxes were relative to the Analogue signal:-
1 -13.6dB
2 >-32db no signal resolved
A -18.2dB
B -18.5dB
C -19dB
D -30.5dB just resolved

Using a Thurlby Thandar PSA2701T Spectrum Analyser and a dipole at line of sight to Bilsdale.

I think the figures say it all, 2 and D are no good in our direction.

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GB

Update! Following my bringing this to the attention of ITV (as their signal's affected) they are now looking into it. Mux 2 and D are well under par to the southwest, but the other muxes are fine.

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GB

I think the term we're looking for is desensing here. Whilst the signals are near to the wanted signals, they'll be within the pass band of any amplifier - indeed if there is any attempt to limit their bandwidth in any case. Just like some amplifiers are filtered against TETRA, those affected would have faced quite large costs to receive a relatively weak TV if they went down the filtering route, which would have been paid for by the 4G supplier. There's not much of guard band really and given that TV front ends go up to Ch 68, their receiver performance isn't in the communications receiver class. Seems they would simply shift those affected onto Freesat to avoid any excessive costs.

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GB
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