Reception problems BBC HD

[PositronicRay]

These 2 channels have gone (107 over the weekend 106 disappeared last night)

107 BBC News HD
106 BBC 4 HD

Both signal strength 30% quality 0

All the other channels HD (BBC ITV etc ok)
All non HD channels OK

All these have circa 80% Signal strength and 100% quality.

A bit of a vipers nest of coax cables in the loft with a Wolsey amplifier feeding 5 TV points, another TV point seems to be split from a one of the roof aerial coaxes before it goes to the amp.

Not all the coax TV points work in the house, but we only use 2 anyway.

I've tried bypassing the amp and plugging one of the TV points directly into the roof aerial, all works as above still no 107 or 106

Any ideas before I call an aerial man?


ETA it's channels 106-111 that've gone. Guess it's time for an aerial man.

Edited by PositronicRay on Wednesday 17th January 15:58

[clockworks]

Are the missing channels on the same multiplex in your area? It could be a transmitter issue.

I don't get BBC News HD on Freeview in my area, as our local transmitter doesn't carry the com3 (I think) multiplex. I have to use Freesat.

I've had problems with HD channels in the past, caused by dodgy coax and a broken aerial mast, but all HD channels were affected.

Edited by clockworks on Wednesday 17th January 17:05

[Belle427]

Its always worth checking the coax connections are secure and made off properly.

[speedking31]

You can check your local transmitter here, but obviously using your transmitter name.

[Mr Pointy]

Have you done a rescan? I got a warning flashed up yesterday saying a rescan would be needed (Hannington transmitter).

[PositronicRay]

Thanks chaps

I've remade any connections I can get at, the AWOL channels are all part of one MUX, no transmitter problems. So thinking aerial.

[VEX]

Have you returned the tv?

Could have just juggled the multiplexes around.

Or could have water in the coax.

Or could have to much signal.

V.

[PositronicRay]

VEX said:

Have you returned the tv?

Could have just juggled the multiplexes around.

Or could have water in the coax.

Or could have to much signal.

V.

Retuned TV, lost 107 completely
Signal 80%
If problems on the roof I'll need an aerial bloke.

[VEX]

Just 107 or the whole multiplex?

[VEX]

Also have you check the multiplex hasn’t been moved somewhere else or turned off completely?

[PositronicRay]

It's the whole multiplex, strangely enough it's just come back. Albeit @ a low 45% signal and 80% quality.

[Super Slo Mo]

Sounds like it’s at the TX end to me, like a PA has failed. And now they’ve either removed it or done a short term fix.
Unless your aerial has somehow managed to go out of band. There isn’t a birds nest on it is there?

[Mr Pointy]

Nothing at your end can lose just one Mux. It's got to be a transmitter issue or change.

[PositronicRay]

Mr Pointy said:

Nothing at your end can lose just one Mux. It's got to be a transmitter issue or change.

Odd, nothing reported.

[PositronicRay]

Playing up again

Channels 106-110 + 113 all on 570.00 MHz (CH33)

[Mr Pointy]

Which transmitter is your aeriel pointed at?

[PositronicRay]

Mr Pointy said:

Which transmitter is your aeriel pointed at?

Sutton Coldfield

[VEX]

Is it wet outside, when it came back was it drier outside, sunny, warmer?

Water or moisture in the cable can effect very specific frequencies and therefore potential a single Mux or a narrow group of muxes.

Looking at the SC transmitter, the mux you are missing is C33 and the lowest of all them. Just wanted the check it wasn’t in the middle of the pack.

So could be a hardware fault, filtering out a lower group of signals, or water ingress causing the same problem.

V.

[PositronicRay]

VEX said:

Is it wet outside, when it came back was it drier outside, sunny, warmer?

Water or moisture in the cable can effect very specific frequencies and therefore potential a single Mux or a narrow group of muxes.

Looking at the SC transmitter, the mux you are missing is C33 and the lowest of all them. Just wanted the check it wasn’t in the middle of the pack.

So could be a hardware fault, filtering out a lower group of signals, or water ingress causing the same problem.

V.

Thanks, yes it's C33 we're missing, it came on suddenly, both TV's in the house affected, weather could certainly be to blame. Time for an aerial man.

I'm guessing if it's an aerial/cable problem it's likely to get worse and affect other channels.

We do have a Wolsey aerial booster, it doesn't make much difference (apart from an all round lower signal strength) if I bypass it.

Edited by PositronicRay on Saturday 20th January 08:22

[PositronicRay]

Seems to have come back ok, signal strength a little low around 50-60% quality 100%