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John Rowland Walters Saturday 18 October 2008 7:33PM Blackwood
Hi, I have freesat with HD on BBC 1(108) &ITV (103)with red button HD. On several occasions BBC HD goes off especially in the evening. When this happens the signal strength indicator completely disappears and if I try and retune the complete channel list at this time the set does not pick up channel 108,I have to retune next day to restore 108.No other channels are affected and I have done all the usual eg. disconnect the box from the mains for 60secs etc. I can only assume this is a transmission problem.There are never any announcments about breakdowns etc. Any ideas??? John.
John Rowland Walters Sunday 19 October 2008 3:21PM Blackwood
Hi Briantist, Not always in bad weather, last night it was ok till silent witness came on, it was good weatherwise and I checked signal strength at the time it went off and it was about 40% normally about 85-90% no other channel was affected and all had good signal strength. I have a Goodmans 200 box( only one available at the time) and may try to contact them.HD in the daytime has no problems. John
John Heath Tuesday 18 November 2008 12:15AM Cullompton
I see the freeviewsignal from Stockland hill is due to increase 9 fold on switchover. Will the radio signal for DAB also be increased at this time (or later). I hope so as we have very patchy reception at present. (EX15 3RJ)
Thanks.
Good evening, I take my Freeview transmissions from the Blackhill Transmitter. Mux1(Ch41), Mux2 (Ch47), MuxA (Ch44), MuxB (Ch51), MuxC (Ch55); all give really good 'Signal Quality' on all channels at all times.
The problem is with MuxD (Ch65)826000kHz2 K 1/32. The signal Quality varies considerably and is quite often too broken and distorted to watch.Have you any idea why this Mux should give such a varied signal quality. Thanks and regards, Iain
Archi Lamont: You didn't provide a postcode, but if you are in between switchover starting and ending, you will find that Grampian has switched to where BBC TWO was on analogue.
This will be the case until the rest of the digital services start shortly.
Iain: I'm going to differ from Brian and say that you probably still have a Group B aerial. The cut-off on the aerial's performance isn't usually that sharp and many Group B aerials are still good for Ch55 (Mux C). However, it will be terrible for Ch65 (Mux D).
Gain (curves), Again shows how well a range of Group B aerials performs over the whole range of TV transmission frequencies.
All transmissions will be within Group B at switchover, so if you can live without Mux D for the next year, I wouldn't bother replacing it right now.
If you can't live without it, you should consider a Group E or wideband aerial.
Digital UK's postcode checker reckons that the Darvel transmitter will be a better option for you after switchover, but Black Hill is better now. The best transmitter will be the local Kilmacolmrelay, but that will only transmit the three public service multiplexes. (RG47SH)
Many thanks for your comments Gents. The Aerial was rigged about five years ago and I really don't know if it's Group B or E.It's only in the last year or so that the signal on Ch65(MuxD) has deteriorated. Some of the time it's 100% 'signalQuality' at other times it moves rapidly between 10%, 20%,40%. 60% fluctuating upwards and downwards. From your guidance I think I may sit tight till next year. Any idea of the timescales for the 'Changeover'. However I need to do some homework about aerial types.Time may have passed me by yet again.Thanks and regards,Iain.
Iain: given how recently that was fitted, it's possible that the aerial and cable aren't sufficiently weather-proof.
Is the cable run firmly fixed down? If it runs over tiles and isn't held into place (with cable clips) every few inches, it can move in the wind and it'll rub through the insulation. Once that happens and the outside copper rubs through, it isn't shielded properly and loss starts to occur. Higher frequencies will tend to be lost sooner.
The other possibility is that water has got into the point where the cable attaches. This in itself can cause problems, but even worse it can run into the air-gap in the cable's internal insulation, which again increases the losses in the cable run.
Thanks Mike, I had new Co-ax professionally run a couple of years ago when the roof was replaced but I'll check the connections as you suggest. There is only one at the Arial on top of the mast and one inside the living room and they used high quality Co-ax cable suitable for outdoor use. I've just checked the inside connection and it's sound. I'll check the outside over the weekend. Thanks again. Iain.
Mike:The outside connections and cable all look fine with no deterioration so I think I have to go with your original suggestion. I was talking to a couple of neighbours who live nearby and they are experiencing the same problems ie, intermittent signal quality fluctuations on Ch65.Maybe we just have to wait for the switchover.Thanks again, Iain.