First of all, let's set the scene for a bit of context.
The original TV system in the UK was known as 405-line and was in use from 1936 to 1985. The lowest TV channel was B1 with the video carrier being on 45.0 MHz.
One unusual feature of this system was that the audio was AM and this was 3.5 MHz lower than the video carrier i.e. 41.5 MHz for Channel B.
Pat Dyer, WA5IYX was a very active TV DXer and logged many TV station over the years. Back in November of 1981 after the peak of solar cycle 21, he managed to hear the TV audio on AM on 41.5 MHz from several transmitters in the UK at his home in San Antonio, Texas.
The distance was about 7500kms and was most likely multi-hop F2 propagation.
Pat is now unfortunately silent key but he did send on the recording to Hugh Cocks, a long time TV DX-er himself and now living in the south of Portugal.
The audio can be heard below. See below the video for a description from Hugh.
Hugh writes... "He sent me the recording many years ago, I can't see it on his own channel so thought it was a good idea to post it on YouTube. There are very few 405 line TVDX recordings in existence.
Mainly BBC 1 from the Divis , Northern Ireland 405 line VHF transmitter on 41.5 MHz.
The Recording starts at 1738 UTC where the regions run separate promos. Divis dominates, around 30 seconds in 'Nationwide' can be heard which is almost certainly from the London area Crystal Palace transmitter on the same frequency.
At least one other signal is there too, maybe from Wales or Scotland or Redruth in Cornwall.
After 90 seconds or so they all combine to transmit the national news from London,
The rumbling/varying tone in the background at times is the beating together of the AM(amplitude modulated) audio carriers which are on fractionally different frequencies.
405 line VHF transmissions finished in early 1985."
