All posts by Tony
Below are all of Tony's postings, with the most recent are at the bottom of the page.
Appreciate the reply Dave. That information gives channel numbers, not frequencies. For example. BBC4 HD has a channel number of 106, and on my media center (the box having the problem), it has selected 561.833Mhz (quality 33%) as the 'best'. It has alternatives of 562Mhz (but shows 0% quality on that), and 562.167Mhz, also with 0% quality). When I select the channel, I can see it trying to lock on, and there is something there (briefly), but then I just get a 'weak or no signal' message. As I said, all other channels/muxes are rock solid.
For the HD channels I'm interested in on COM7, this is what I see;
BBC News HD (C 107) 561.833Mhz
C4 + 1 HD (C 110) 561.833Mhz
4Seven HD (C 111) 561.833Mhz
I do have locator info for each channel as well if this is of use.
Other working HD channels on different muxes seem to lock onto the other side of the frequency, for example BBC 1 HD locks onto 618.167Mhz, and the picture is fine. I've tried manually changing the frequencies (media center allows that), but it didn't make any difference - infact, there was no signal at all reported there.
I had an engineer in earlier in the week to resolve a different problem, and he verified signals received from all muxes (via the masthead amp) are good (about 65db or up), and gave the aerial/amp a clean bill of health (once we'd replaced the PSU, which had bust).
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I had a new aerial cable from the main socket that feeds the masthead amp made up by the engineer, so that is all fine. Signal levels are good over the downlevel cable from the amp. I split the feed from this connection - one to the TV, the other to the media center. The TV reception of COM7 HD channels is perfect, it's just the media center. I really just wanted to check the exact frequencies I should be expecting, as the TV doesn't give that type of diagnostic information. Knowing that COM7 should be on 562Mhz (not above or below) is useful.
It's a strange one - not a deal breaker, but one of those frustrating 'why isn't it working type problems'. I did notice from the chart that the COM7 (and soon to be COM8) require a 'W' type aerial group, but as I said, other TV's in the house receive COM7 channels fine, so I don't think it can be that. The aerial checks out anyway.
Guess I'll have to keep digging then.
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Sunday 11 January 2015 10:35AM
One media box in the house isn't receiving any HD channels from the COM7 mux on Hannington. All other TV's receive them fine. I can see the exact frequencies it's trying to tune to, but I need a breakdown of what the channel mux/frequencies should be on COM7 to compare. Can anyone help?