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All posts by Geoff

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

Bluebell Hill (Medway, England) Full Freeview transmitter
Thursday 6 December 2018 8:55PM

I ME15 8NQ

Com7 and Com8 channels are sporadically breaking up to disappearing.
First thing in the morning they exist Early afternoon they have degraded to 0% signal strength
Evening they return.

Signal quality is always low 30% to 50%

Aerial is professionally installed as a distributed network across 90 or so properties in a retirement village.

BBC4 HD and BBC NEWS HD are the key requirement but all channels on COM7 & COM8 are affected.

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MikeP: Thanks but it is clearly not the aerial system here.

Noting comments elsewhere exactly the same problems were being reported as long ago as January by users in the north of the country.

Only Channels 55 and 56 are affected with the COM7 and COM8 multiplexes. Everything else is perfect here.
Noting today that the bit error rate on those channels climbed during the day.

I have changed my cables, inserted a variable attenuator to no effect. You can't attenuate a signal that is already zero

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The aerial is wideband and professionally installed distributed system.
Also the fact is that those channel are received ok much of the time, they just degrade at random.
I tried an attenuator after reading a post somewhere about signal strength being too strong and causing tuners to mis-interpret the data being decided. Clearly not the issue and I did not really expect it to have any effect.

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Currently Chanel 55 is registering

Bit error level. 2000
Signal Strength 92
Signal Quality 7. Drops to 3 and 0 and back again

Chanel 56 is registering
Bit error level 1200 to 1317
Signal strength 94
Signal Quality 44

Steady and no break ups at this time - this changes day by day.
Regular signal issue on BBC 4 HD on a Saturday 9pm onwards. For weeks recordings of the dramas at that time have either failed or pixelated. But signal good at other times such as right now.

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Thanks for all the input - amazingly the last two days has seen no issues with the channels.
However I, and some others, will be trying to persuade management that the system must be looked at. Everything said here makes absolute sense, so will see how it goes.
Thanks again

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