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All posts by Chris.SE

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


Brian Richardson:

Hmm. I would imagine that just unplugging the aerial for a few seconds and reinserting it, is simply causing the set AGC to change and taking several minutes to settle down again.
Try tweaking the booster/splitter gain down a fraction and see what it does to ALL the figures.

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Brian Richardson:

My interpretation of the tropo predictions at the time was that there might have been a slight cessation early afternoon maybe late morning) but returning during the evening. This does look as though this could be what you've seen BUT also those major improvements in the COM signal strengths suggest the Planned Engineering had something to do with it, and it's probably stopped for the weekend. Unfortunately it looks as though there'll be more next week, but that TBC.

Those latest figures are very good news, lets hope it's not a fluke of the weather.
Now, the other interesting thing is that it may indeed by a wideband aerial with those figures.
However, a significant observation is that the two muxes with the high errors are those with signal 96. So tweaking the gain down a touch may well improve things. It could be a bit of a trader-off between getting the errors down to something acceptable without losing too much signal elsewhere resulting in errors there.

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C
Details of BBC_Radio_Derby DAB radio station
Sunday 23 January 2022 12:45AM

A Bridges:

Well this is quite odd, Cromford locks like it's in a bit of a pocket of no reception from 3 of the 4 transmitters carrying the Local multiplex that has BBC Radio Derby, but the 4th is very close at Bolehill fractionally E of due S of Cromford about 1 1/2 miles away. The mux is on Block 10B: 211.648 MHz.
Make sure you don't have any thick walls, large metal objects like fridges, freezers etc on the line-of-sight to the transmitter which also has the BBC National mux on Block 12B. Try a south facing window sill. But as StevensOnln1 has said, a full postcode would be needed to check the predicted reception.

BBC Radio Leicestershire is on a Local mux on Block 11B: 218.640 MHz and as StevensOnln1 has implied there are no transmitters with it nearby. Do you get stable constant reception of it, or has it just been there on and off in recent days? If the latter this is likely to be due to current weather conditions creating "Temperature Inversion" where signals from distant transmitters are carried further than normal, due to the particular layers of the atmosphere.

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BBC Three
Sunday 23 January 2022 12:52AM

Mark A:

See also https://www.freeview.co.uk/help/service-updates/bbc-three-launch
Because of the LCN the SD version will be placed at in the EPG - LCN23 - the other channels in the range 25-82 have to shift up one. Davejavu moves from 23 to 25.
BBC3 HD will be at LCN109.
A retune will most likely be needed.

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Gill Perry:

This is likely to be due to current weather conditions creating "Temperature Inversion/Tropospheric Ducting" where signals from distant transmitters are carried further than normal, due to the particular layers of the atmosphere. It causes interference to your wanted signals. The problems can last for seconds, minutes ,hours, sometimes even longer. Do NOT retune, you are likely to just lose your correct tuning.
There are currently no reported transmitter faults.
Despite the incorrect spelling, this link does work - it's a very simplistic technical explanation of the sort of thing that goes on.
https://www.bbc.co.uk/reception/sites/default/files/inline-images/tropispheric%20ducting1_0.jpg

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Bryan Mitchell:

It's simply because LCN51 GREAT! movies classic is carried on Local Multiplexes.

See https://www.freeview.co.uk/corporate/platform-management/channel-listings-industry-professionals for which channels are carried on which multiplex.

Local multiplexes are only transmitted from a limited number of main transmitters and in most cases the signals are beamed towards the large urban conurbations that they were set up to serve. There is no Local multiplex at Rosemarkie or any other transmitter in the region that you might be able to get some signals from.
Nevertheless Rosemarkie will give you very good reception and is the best one for you.

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