Is anyone still able to receive COM7/8 in London? Retuned today due to the frequency changes to the aforementioned two muxes (as well as the Local mux) and I have lost reception to COM7 and COM8.
Do you have a Group A (UHF 21-37) aerial ? That'll be the problem if so, COM 7/8 at CP have now moved to UHF 55/56, (all thirty sites that carry the COM 7 and 8 will eventually adopt these frequencies as a national SFN)
I'm very much in the CP service area, in West London 20km from the tx, and I am struggling unexpectedly with COM 7 & 8.
I'm seeing a signal, but with zero "condition" which makes me wonder if I am seeing two transmitters (although these muxes should be an SFN?).
Channel 29 has a residual signal shown - but too weak to demodulate, channel 35 (Local Mux) is fine.
I will have to go up to the attic to see what group my aerial is - can't remember if it is Group A or not!
I'm very much in the CP service area, in West London 20km from the tx, and I am struggling unexpectedly with COM 7 & 8.
I'm seeing a signal, but with zero "condition" which makes me wonder if I am seeing two transmitters (although these muxes should be an SFN?).
Channel 29 has a residual signal shown - but too weak to demodulate, channel 35 (Local Mux) is fine.
I will have to go up to the attic to see what group my aerial is - can't remember if it is Group A or not!
In the London area currently there are no other sources of 55 or 56 receivable (the London area relays that were using the channels were shut down last night too)
Ch29 will be the local Reading mux from Hannington, (that moves to 34 on April 18th) and COM 7/8 Hannington also move to 55/56 that day, making them potentially receivable in London too.
I suspect that I did the right thing and installed a Group A aerial, as you should have done back then.
I don't think replacing it is going to be worthwhile for a couple of channels for a couple of years before the whole lot is switched off anyway.
BBC Four and News HD were the only ones that I used regularly.
Back to SD for those!
I've lost COM 7 on all three DVB-T2 devices, but have COM 8 on all of them... Odd. They are only 8MHz apart...
I suspect if you were to look on a spectrum analyser, there'd be a large hole (due to standing wave mismatch etc) possibly affecting both muxes, but effectively knocking COM 7 out of decodability.
I'm am going to have to get a spectrum analyser to have a look, but the coverage is obviously OK - I've got another TV fed from a separate aerial I installed much later, and that is fine, and is therefore almost certainly a wideband one. (Bought from a DIY shop so bound to be a one size fits all.)
If I am struggling well within the service area, then there will be a lot of viewers who will have lost COM 7 & 8 with this move and who have the former correct group A aerials. I had bought this from a specialist shop, so they would have sold me the right one!
Is anyone still able to receive COM7/8 in London? Retuned today due to the frequency changes to the aforementioned two muxes (as well as the Local mux) and I have lost reception to COM7 and COM8.
Do you have a Group A (UHF 21-37) aerial ? That'll be the problem if so, COM 7/8 at CP have now moved to UHF 55/56, (all thirty sites that carry the COM 7 and 8 will eventually adopt these frequencies as a national SFN)
Both of the aerials are indoor - here's the one used for my YouView box:
Is anyone still able to receive COM7/8 in London? Retuned today due to the frequency changes to the aforementioned two muxes (as well as the Local mux) and I have lost reception to COM7 and COM8.
Do you have a Group A (UHF 21-37) aerial ? That'll be the problem if so, COM 7/8 at CP have now moved to UHF 55/56, (all thirty sites that carry the COM 7 and 8 will eventually adopt these frequencies as a national SFN)
Both of the aerials are indoor - here's the one used for my YouView box:
It'll be wideband, but service planning and coverage is always on the basis of the viewer using an outdoor aerial.
Ch 55 and 56 are much higher frequencies than the 21-37 range, so signal loss though walls and obstructions
will be greater
I've lost COM 7 on all three DVB-T2 devices, but have COM 8 on all of them... Odd. They are only 8MHz apart...
I suspect if you were to look on a spectrum analyser, there'd be a large hole (due to standing wave mismatch etc) possibly affecting both muxes, but effectively knocking COM 7 out of decodability.
Yep - it must be a specific null that's hitting COM 7. Annoying. It's a rooftop aerial in West London. Never get any errors on DTT (TV Headend logs them)
I've got a couple of DVB-T/T2 dongles that are compatible with CrazyScan - I'll see what they look like when I get a chance.
I've lost COM 7 on all three DVB-T2 devices, but have COM 8 on all of them... Odd. They are only 8MHz apart...
I suspect if you were to look on a spectrum analyser, there'd be a large hole (due to standing wave mismatch etc) possibly affecting both muxes, but effectively knocking COM 7 out of decodability.
Yep - it must be a specific null that's hitting COM 7. Annoying. It's a rooftop aerial in West London. Never get any errors on DTT (TV Headend logs them)
I've got a couple of DVB-T/T2 dongles that are compatible with CrazyScan - I'll see what they look like when I get a chance.
I wonder if the aerial is Group A though ? (Today is the first instance of Crystal Palace having any transmission outside of Group A in 54 years of UHF broadcasting !) C5 analogue from Croydon 1997-2012 was just outside at Ch 37 From 1997 Group A aerials were manufactured to cover 21 to 37 (1964 to 1997 they were 21-34)
From 1997 Group A aerials were manufactured to cover 21 to 37 (1964 to 1997 they were 21-34)