Replying to several posts...
Martin - I replied with my TV make and model - does this one ring a bell with you, or is there a specific make that has problems please?
Also, your observation to Graham that I had originally posted that when replaying a recording, after a dropout a quick rewind proved that the dropout did not occur in the same place, or even at all. I have done several tests over the last 2 nights and I honestly don't believe the dropouts are on reception.
Graham's points about reception are totally valid, and all make sense, even though I don't think that my problem is a reception one. As there is at least one other following this thread I feel I should add one thing Graham didn't mention, prompted by one of Jack's observations. In the summer after all of the 'freeing up' of bandwidth from the TV frequency allocation for use by the 5G phone network we suffered from high pressure causing reception problems here - I'm in West Sussex on the fringe of the Midhurst transmitter. It was only then I realised our new mux frequencies were well down in the range, and that the C/D aerials still on most of our neighbour's rooves were not helping. The advice then from the broadcasting authorities was to replace any C/D aerials with a broadband aerial. They also advised removing any old aerial amplifiers, particularly from the head end (near the aerial). Although we already had a broadband aerial we still had an old amp in there and removing it transformed our reception in times of high pressure. We rarely see problems nowadays, although every retune seems to result in a change of frequency of at least one mux so I'm touching wood. I've looked to see if the Mendip transmitter was also C/D back in the analogue days but can't find anything - sorry. By the way I'm a licenced radio amateur so I understand a bit about propagation, reception and aerials.
Removal of the right-angled HDMI adapter has virtually resolved the original dropout problem - hence the delay in posting this as the problem has become much less frequent so getting examples has been difficult. HDMI has gone through several generations from its initial incarnation, and has become considerably more echnically demanding. I know from another incompatibility a while back that when HDMI is attached/first used it negotiates to establish whether the spec of each end, and all interconnects, are up to scratch. What I haven't been able to find is a clear description of whether the negotiation is only carried out on first connection or initiated on every use. Does anyone have a link to a good technical description? It may be that when changing around the HDMI cables on my new TV I need to force both ends to 'forget' and renegotiate.
Sorry for the long post, but I wanted to try to ensure that what had been one issue is clear to people trying to solve what may be a different issue.
All thoughts gratefully received!
| Wed 21 Jul 2021 12:35:42
#10 |
