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Loss of Mux C from Waltham (Read 596 times)
lather
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Loss of Mux C from Waltham
Feb 5th, 2010 at 11:55am
 
I know they've listed planned work at Waltham for this week, leading to possible weak signals, but I was wondering if anyone else has the same problem as I do - Loss of Mux C. It's been down since Tuesday, and is the only one where there's problems.

Fortunately, the only channel I usually watch on Mux C is Dave, and the +1 repeats on Dave Ja Vu are on a different Mux, but it's still a bit irritating!
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MartinPickering
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Re: Loss of Mux C from Waltham
Reply #1 - Feb 8th, 2010 at 10:06am
 
Judging by the lack of replies, it seems to be affecting only you. In which case see http://www.satcure.com/tech/terindex.htm
"31. Freeview Terrestrial problem ?"
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denismartindale
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Re: Loss of Mux C from Waltham
Reply #2 - Feb 9th, 2010 at 1:05am
 
I checked my Fetch TV Smartbox 7000 set top box using the 999 shortcut to Help, Diagnostics, TV Signal.

I checked each of the first 12 channels for each of the Mux groups. Every single one of the Waltham region's MUX groups is at the normal signal strength that I maintain between 80% and 88%.

Dave is on Freeview 19 on the C33 MUX group. The Signal Strength is 73% and Picture Quality is 85%.

If you are not getting any of the MUX groups, I'd question if a retune is necessary or a manual scan after clearing all channels first.

If your set top box allows a manual scan, then search for C23, then C26, then C33, then C42, then C45 and finish with C49. Otherwise, test with an automatic rescan.

Remove the aerial input into the Freeview box, run autoscan to get zero channels. Reconnect the aerial input and run autoscan again and get all possible channels. I've recently got 97 channels through the wideband all-frequencies aerial. Whether a lower frequencies special aerial is required, I don't know. Maybe giving us your postcode would help to check that aerial option.

I use a signal booster. In my case, the Sky + box is where I plug in the Freeview aerial connection and it helps to boost the signal a little extra. Even so, I still get stable pictures even when I tested fitting a variable attenuator from the http://www.satcure.co.uk/ website.

The signal strength dropped by upto 20%, yet every Freeview TV channel still displayed the same. So I removed the attenuator I had tested.

The signal booster gets the input from the Sky output and I send one of the booster's outputs to the Fetch TV box, another to the DVD Recorder then to the TV.

In Winter, you may need a booster. Please check your Diagnostics Statististics for each of the first 12 Freeview channels that will use each of the MUX groups.

Dave on C33... any signal at all? After a retune or manual scan for C33, what now? Any improvement?

If you check the TV retune website for retune instructions, you may get a better result, or check the productmanuals available:

http://www.tvretune.co.uk/productmanuals

Maybe you have to set the TV channel to BBC News 24 on channel number 80 before a rescan? Maybe you need a software upgrade first?

Please tell us your Freeview box's maker and model number or whatever eg a Freeview recorder of TV with Freeview built-in.

Sometimes, getting an extra Freeview box is a good backup solution. At least it helps check Diagnostics for Signal Strength info.

Also, register free here:

http://www.tvcatchup.com for Dave is listed as a free to watch TV channel and there are a few non Freeview channels as well as a forum for extra options...





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lather
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Re: Loss of Mux C from Waltham
Reply #3 - Feb 9th, 2010 at 11:26pm
 
It was back by late on Friday, but still suffers from a little bit of break-up even now.
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denismartindale
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Re: Loss of Mux C from Waltham
Reply #4 - Feb 10th, 2010 at 1:07am
 
Unless you tell us the details eg Station Signal Strengths, postcode, equipment makes and model numbers, you will have to continue alone and use the forum search to find previous equipment recommendations of this and other websites. If you call in a professional, you can determine if there is equipment failure or whether there are changes in getting new equipment eg to boost or reduce signal strength. In some recent changes to Freeview, the signal strength has been boosted. The signal floods the reception till a weakening variable attenuator is installed. See those keywords and find the satcure website link for that add-on. Boosters are more expensive yet even they should be variable strengths to adjust for the different MUX groups.

Please let us know the details for further comments.

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denismartindale
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Re: Loss of Mux C from Waltham
Reply #5 - Feb 10th, 2010 at 1:21am
 
I've done a few rescans this week and tested for a manual scan as well. In my case, there's no difference. I remove the aerial connection and run autoscan to get zero channels. I reconnect the aerial and try manual scan for C23, C26, C33, C42, C45 and C49 and get 97 channels. We don't know your channels eg 97 or less? We don't know your Freeview equipment, so we can't advise on the most up-to-date productmanuals info on that tvretune website. We haven't got the user manual either, so we don't know of any special way to delete or clear all your Freeview channels, for a fresh start rescan to work. We don't know if you are getting channels numbered in the 800+ range ie duplicates or weaker channels, because of 2 transmitters.

We don't know your aerial or loft installation, or whether extra equipment is installed. Some VCRs and Sky boxes are set to Freeview channel MUX groups and cause interference.

We know some Freeview equipment isn't fully recommended eg TVs with Freeview built-in, indoor aerials, old aerials not suited to recent Freeview National Retune Days.

Perhaps a different aerial, or testing other Freeview boxes helps. Perhaps a booster or attenuator. Perhaps fully-shield cables. Check for loose connections or even a dirty connector eg the aerial input...

I've sometimes taken the upstairs' Freeview box downstairs when I didn't get all the channels. I rescanned from the aerial and got all channels that way instead. A poor upstairs' connection, via a substandard cable, lost a few channels, so it alerted me to check Signal Strength and to replace the cable... Have you tested different cables or extension cables that could boost the signal a little more?

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lather
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Re: Loss of Mux C from Waltham
Reply #6 - Feb 10th, 2010 at 12:48pm
 
I've checked signal strength, and it's only about 50%, so it looks like that's the issue.

As for equipment etc, it's a really cheap dual tuner 80Gb Freeview+ box from Maplin (it cost £40 refurbished) - it isn't even on the website anymore, so it looks like they've sold out. It's only an interim device until finances permit the purchase of a better one, and isn't the best piece of kit you can get, so I'm not too fussed about technicalities. As for the antenna, it's an external wideband, but the house is located in a dip, and so location is probably a big factor...

So it looks like no further help is needed, as the problem has cleared itself as far as it probably will, and any remaining issues are down to low broadcast power and location.

Oh, and postcode is DE56 1HT...
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denismartindale
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Re: Loss of Mux C from Waltham
Reply #7 - Feb 10th, 2010 at 8:00pm
 
Extra info from another Waltham forum member could be helpful, so check here:

http://www.radioandtelly.co.uk/cgi-bin/forum/YaBB.pl?num=1265819925/0#0

The 85% signal strength, given in that example, was not regarded as a totally significant guide, as it included the interference as well.

Amplifiers boost both the signal and the interference or other fault. Sometimes, a variable gain adjustment on a variable strength amplifier/booster allows you to make manual changes to test which setting works for each of the 6 MUX groups available.

It was also noted, that not all aerials are best suited to the lower frequencies range ie from C21 to C45/C49 out of the C21 to C69 range. This problem affects the C22/C23 frequencies, yet doesn't restrict itself to those frequencies. The C45 and C49 frequencies should be stronger, yet if too strong, the signal gets flooded and can't work properly.

That's why professional installers keep testing the aerials, the cables, the Freeview and other frequencies and then test attenuators and amplifiers. After all, the primary source may have to be distributed to other rooms for separate set top boxes etc and for each one that selects from the available channels.

Tuning in during the Summer, is no guarantee of what will work in the Winter. The National Retune Days added their own upgrades and downgrades while Freeview was still transmitting a lot of unpopular channels and in a compressed data form at that, thus reducing the quality for the popular channels most of us bought Freeview for.

Check postcode for Freeview channels that you can get with a recommended aerial eg pointing to the Waltham transmitter.

http://www.freeview.co.uk/

http://www.freeview.co.uk/availability/main/index/landing



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denismartindale
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Re: Loss of Mux C from Waltham
Reply #8 - Feb 10th, 2010 at 8:10pm
 
http://www.freeview.co.uk/availability/main/display/coverage/DE56+1HT/4/0

Please check that postcode channels result webpage and confirm what you can receive...

Some of the channels are blanked out as not currently available to you till the digital switchover.

In such cases, Freeview websites may recommend getting Sky or Virgin Media installed.

The forum has mentioned using the Internet TV and Internet Radio options which will include some Sky and some Freeview channels:

See the links below this post eg tvcatchup and teev and tanktop and check out whatever tv guides or schedules or search site options will be useful. Register free and then visit and select either the TV or Radio channel or a catchup tv show or series.

I've tried USB Freeview dongles as well eg for modern PC operating systems. The most channels I got was just under 70. On Freeview, I get 97. On Sky, I get hundreds of free channels and Virgin Media not so many free channels. If I didn't need Freeview for a few channels not on Sky, I'd have ignored it and just got a few Sky boxes installed instead.

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lather
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Re: Loss of Mux C from Waltham
Reply #9 - Feb 10th, 2010 at 10:37pm
 
The postcode checker is definitely wrong, because I can receive all channels, including the ones it says will only be available after switchover...

But, like I say, it looks like it was just a temporary issue at the TX, and the problem has now cleared itself as far as it is going to until the TX power is increased post-switchover. And I can live with how it is now, so I don't think any further help is needed.
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