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The five multiplex (Cambs & Beds).
"ian field" wrote in message ... The following freeview channels: Five (5), QVC (16), Virgin1 (20), Bid TV (23), Fiver (30) and 5 USA (31) are all flaky with squares most of the time and frequent "blue screen of death". In the status menu, the signal quality bargraph goes up and down like a yo-yo - including up to 100% and all the other channels are OK so its reasonable to assume the aerial isn't too bad, so can anyone tell me what's going on? TIA. Some tuners have the inability to show the correct signal strength.. I have had several DVB-S tuners (yes, I know it's not freeview) that would show 100% signal, but they were actually only showing 0% (no signal at all) or 100% (some signal - full signal).. Possibly there is some other noise that's appearing in the same frequency spread?... The most likely reason for it is that the BBC has once again used our money to try and thwart other operators from having valid stations.. If they can shove them out for good then they can give us radio1 DJ's in high def sound and bump their salarys up by an extra 2m/year. *joking btw*... We all know they would get an extra 5m/year. |
The five multiplex (Cambs & Beds).
"ian field" wrote in message ... "tony sayer" wrote in message ... In article , ian field gangprobing. scribeth thus "tony sayer" wrote in message ... In article , ian field gangprobing scribeth thus "tony sayer" wrote in message ... In article , Brian Gaff scribeth thus Well, it could just be an accident of the size compared to the actual frequency. Other than trees, I guess it could be desensitisation by some nearby transmitter of a taxi firm or similar, Very few of them left now and the ones that are, are on a hilltop site.. but you could suggest this also would affect them all. It also seems strange if its a transmitting aerial problem for the same commonality reason. That only leaves a dodgy transmitter for that multiplex, which, I'd have thought would have had so many people complaining it would be fixed pdq. What after it took them ages to get Hannington fixed It seems to vary somewhat with the weather, today the signal quality bargraph is showing a solid 100%, on other days it fluctuates wildly. There's a six output booster distributing to various rooms with 8.6dB gain and a 2 output booster with 16.8dB has been added in front of that with the result, the bargraph spends less time on the bottom and a noticeable reduction of squares and "blue screen of death", I was wondering if I could get away with adding another 16.8dB booster - the claimed noise per booster is 3dB. Seems to me that a bit more aerial gain might cope better . Can you say where are you and where the aerial is?.. -- The aerial is on the roof and the rigger damaged the roof causing serious leaks last time, as long as the aerial looks to be OK I'd prefer not to send any more expensive cowboys up there!!! Well thats seems to indicate all isn't as well as what it ought be up there either!. Any idea or have you a pix of what's actually up there?.. All the other channels work fine, its only the multiplex that carries five and Virgin1 - that wouln't be the case if the aerial was dodgy. And any approximation of where you are relative to Sandy?.. -- Tony Sayer If I stood on the roof at night I could see the lights on the tower that stop aircraft flying into it. I think tony was trying to help you... Take a picture of your antenna.. Give a DIRECTION and some Mileage from the tower (I live 4 miles ssw of it) or something of the ilk |
The five multiplex (Cambs & Beds).
In article , ian field gangprobing
scribeth thus "tony sayer" wrote in message ... In article , ian field gangprobing. scribeth thus "tony sayer" wrote in message ... In article , ian field gangprobing scribeth thus "tony sayer" wrote in message ... In article , Brian Gaff scribeth thus Well, it could just be an accident of the size compared to the actual frequency. Other than trees, I guess it could be desensitisation by some nearby transmitter of a taxi firm or similar, Very few of them left now and the ones that are, are on a hilltop site.. but you could suggest this also would affect them all. It also seems strange if its a transmitting aerial problem for the same commonality reason. That only leaves a dodgy transmitter for that multiplex, which, I'd have thought would have had so many people complaining it would be fixed pdq. What after it took them ages to get Hannington fixed It seems to vary somewhat with the weather, today the signal quality bargraph is showing a solid 100%, on other days it fluctuates wildly. There's a six output booster distributing to various rooms with 8.6dB gain and a 2 output booster with 16.8dB has been added in front of that with the result, the bargraph spends less time on the bottom and a noticeable reduction of squares and "blue screen of death", I was wondering if I could get away with adding another 16.8dB booster - the claimed noise per booster is 3dB. Seems to me that a bit more aerial gain might cope better . Can you say where are you and where the aerial is?.. -- The aerial is on the roof and the rigger damaged the roof causing serious leaks last time, as long as the aerial looks to be OK I'd prefer not to send any more expensive cowboys up there!!! Well thats seems to indicate all isn't as well as what it ought be up there either!. Any idea or have you a pix of what's actually up there?.. All the other channels work fine, its only the multiplex that carries five and Virgin1 - that wouln't be the case if the aerial was dodgy. Not necessarily And any approximation of where you are relative to Sandy?.. -- Tony Sayer If I stood on the roof at night I could see the lights on the tower that stop aircraft flying into it. Well something very wrong there then, any chance of a close up pix of said aerial?.. -- Tony Sayer |
The five multiplex (Cambs & Beds).
On Thu, 18 Jun 2009 22:26:47 +0100, "ian field"
wrote: The following freeview channels: Five (5), QVC (16), Virgin1 (20), Bid TV (23), Fiver (30) and 5 USA (31) are all flaky with squares most of the time and frequent "blue screen of death". In the status menu, the signal quality bargraph goes up and down like a yo-yo - including up to 100% and all the other channels are OK so its reasonable to assume the aerial isn't too bad, so can anyone tell me what's going on? TIA. Is this a communal aerial or is there an aerial amplifier? I believe these can sometimes affect one multiplex. |
The five multiplex (Cambs & Beds).
"Scott" wrote in message ... On Thu, 18 Jun 2009 22:26:47 +0100, "ian field" wrote: The following freeview channels: Five (5), QVC (16), Virgin1 (20), Bid TV (23), Fiver (30) and 5 USA (31) are all flaky with squares most of the time and frequent "blue screen of death". In the status menu, the signal quality bargraph goes up and down like a yo-yo - including up to 100% and all the other channels are OK so its reasonable to assume the aerial isn't too bad, so can anyone tell me what's going on? TIA. Is this a communal aerial or is there an aerial amplifier? I believe these can sometimes affect one multiplex. Its a single house installation specifically ordered from the rigger to be DVB-T compatible, an 8.6dB 6 way splitter/booster was added at the bottom of the downlead to serve several rooms. A second booster was added some months ago when there was poor signal on the multiplex carrying the ITV channels, that was left in place after the signal improved again, but more recently the multiplex carrying Five and Virgin1 has become weak, the booster was then replaced with one having higher gain (16.8dB) that improved reception slightly but it varies from perfectly OK one day to fluctuating wildly the next. Someone in an earlier reply said Sandy Heath had aerial work recently - looks like they're having maintenance problems. |
The five multiplex (Cambs & Beds).
On Mon, 22 Jun 2009 22:46:38 +0100, "ian field"
wrote: "Scott" wrote in message .. . On Thu, 18 Jun 2009 22:26:47 +0100, "ian field" wrote: The following freeview channels: Five (5), QVC (16), Virgin1 (20), Bid TV (23), Fiver (30) and 5 USA (31) are all flaky with squares most of the time and frequent "blue screen of death". In the status menu, the signal quality bargraph goes up and down like a yo-yo - including up to 100% and all the other channels are OK so its reasonable to assume the aerial isn't too bad, so can anyone tell me what's going on? TIA. Is this a communal aerial or is there an aerial amplifier? I believe these can sometimes affect one multiplex. Its a single house installation specifically ordered from the rigger to be DVB-T compatible, an 8.6dB 6 way splitter/booster was added at the bottom of the downlead to serve several rooms. A second booster was added some months ago when there was poor signal on the multiplex carrying the ITV channels, that was left in place after the signal improved again, but more recently the multiplex carrying Five and Virgin1 has become weak, the booster was then replaced with one having higher gain (16.8dB) that improved reception slightly but it varies from perfectly OK one day to fluctuating wildly the next. Someone in an earlier reply said Sandy Heath had aerial work recently - looks like they're having maintenance problems. Have you tried without the booster? I thought boosters were a bad idea for digital and also that the connection from aerial to decoder should be uninterrupted. |
The five multiplex (Cambs & Beds).
Its a single house installation specifically ordered from the rigger to be
DVB-T compatible, an 8.6dB 6 way splitter/booster was added at the bottom of the downlead to serve several rooms. A second booster was added some months ago when there was poor signal on the multiplex carrying the ITV channels, that was left in place after the signal improved again, but more recently the multiplex carrying Five and Virgin1 has become weak, the booster was then replaced with one having higher gain (16.8dB) that improved reception slightly but it varies from perfectly OK one day to fluctuating wildly the next. Someone in an earlier reply said Sandy Heath had aerial work recently - looks like they're having maintenance problems. If your having to add a "booster" when you can see the top of the aircraft warning lights then it rather seems to me that something is very wrong with the aerial system there. All channels are fine here and equal level at 18 miles LOS from Sandy just south of Cambridge so I rather doubt its a transmitter problem... I can't recommended anyone but it would seem to me that the attentions of a "competent" rigger are called for.... Any possibility you could post some pix of this aerial just to make sure that its the right sort and pointing in the right direction and are there any large trees etc nearby?.. -- Tony Sayer |
The five multiplex (Cambs & Beds).
On Mon, 22 Jun 2009 22:46:38 +0100, ian field
wrote: Its a single house installation specifically ordered from the rigger to be DVB-T compatible, an 8.6dB 6 way splitter/booster was added at the bottom of the downlead to serve several rooms. There is no point putting a booster at the bottom if the problem is lack of signal. It needs to go at the top. If you just need to split, then you must have adequate signal level first. A second booster was added some months ago when there was poor signal on the multiplex carrying the ITV channels, that was left in place after the signal improved again, but more recently the multiplex carrying Five and Virgin1 has become weak, the booster was then replaced with one having higher gain (16.8dB) that improved reception slightly but it varies from perfectly OK one day to fluctuating wildly the next. Added where? Increasing gain doesn't generally increase receive margin, especially if put in the wrong place. You need to get levels measured at the top and then work out where to go from there. |
The five multiplex (Cambs & Beds).
On Mon, 22 Jun 2009 23:02:37 +0100, Scott wrote:
Have you tried without the booster? I thought boosters were a bad idea for digital and also that the connection from aerial to decoder should be uninterrupted. Both are myths spread by the ignorant. |
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