All posts by Ray E
Below are all of Ray E's postings, with the most recent are at the bottom of the page.
Chris.SE:
Without doing anything, this morning all COM7 channels returned but with extremely poor signal quality.
Signal level is steady at 66 but signal quality is fluctuating between 0 and 35. Neither are brilliant compared to other HD channels which show max. quality and strength.
On COM7 there are significant Post LDPC errors, 3.01e-04 while Pre LDPC are showing as 5.53e-02
As the day has gone on, reception has worsened to the point at 1pm I'm getting "No Signal" with signal quality 0 and signal level fluctuating between upper 50 and low 60.
I'm guessing that this may be an atmospheric problem as weather conditions here are still wet and windy.
I'll monitor COM7 channels later tonight once it's dark and weather has improved, forecast is reasonable for Friday so I'll check again then.
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Not sure how significant this is or if it relates to the error correction problem but I've just noticed COM7 guard interval is 1/16 whereas it should be 1/128
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Chris.SE:
Reports on Digital Spy Freeview forum regarding CH55 problems since last Friday so that coincides with my experience. Looks like we'll need to wait until those responsible accept that there's a fault.
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Mendip COM7 slowly improving from mid-morning today.
Signal quality into the mid 50% and signal level into the upper 60% sometimes into low 70s
Sound and video are now both steady and acceptable.
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It wasn't a sudden improvement, it just slowly got better over about 7 days......I'm leaning towards weather conditions as the cause although I've never experienced such a degradation on a single mux before.
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They are obviously still experiencing intermittent signal problems....I lost signal completely today for a significant time but now it's back at 100%. At various times recently, the signal has decreased for a short time but today's total lack of signal was for much longer.
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Ray E:
Revisiting this problem because having replaced flyleads with quality double screened variety and isolating them from HDMI leads I'm still losing CH55. There seems to be no consistency as regards weather conditions or time of day or day of the week. C/N varies between 0 and 18 which is well below the level for a good signal (should be 25 to 35). UEC data sky rockets from 0 to 200000+. Currently C/N = 19 with UEC = 331135. Occasionally I lose CH55 completely and I have to manually retune just those LCNs.
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Chris.SE:
Timeframe is varied. It occurs at any time of day for any length of time but only Com7 National is affected. All other muxes return maximum signal quality and level i.e. 90%+ when Com7 is playing up.
Currently all LCNs on Com7 National are showing good results so perhaps Trops is the cause as weather conditions are much improved from last week's......but I still have niggling doubts.
Megalithia terrain map indicates an unobstructed path to Mendip transmitter.
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Chris.SE:
I get 100 GREEN on all muxes except COM7 which GREEN 99 for Served and 100 for Marginal.
Currently COM7 LCN107 is showing Signal Quality 74 and Signal Level 77 with C/N 21 or 22.
Weather is dense cloud and raining. So the cause does veer towards a weather source.
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Page 1
Tuesday 14 January 2020 5:26PM
I'm not receiving anything on CH55 COM7 Mendip transmitter (I'm in North Bristol near M32/M4 junction), all other channels are perfect. I've manually retuned CH55 and its frequency 746.00mhz but get "No signal, selected programme is not tuned".
This has only happened in the last few days.
TV and PVR show the same problem.
Any ideas what to try next?