UK TV frequencies map - channel C39 (618.0MHz)

Why not use many more smaller (lower power) TV transmitters similar to mobile phone masts then you could use lower power and more channels using 64QAM multiplexer plus the 4 colour map solution giving even more potential channels.

Stafford Carr: Three reasons: firstly that it would require almost everyone to get a new TV aerial, whereas the current scheme only will require a small percentage to get them; secondly the costs of construction and distribution would be excessive, the third reason is that the existing transmission frequnecies are used, the current digital signals are added to the analogue transmitter plan.

Would you please explain why it was decided to use QAM16 coding on four of the multiplexers, while the other two use QAM64 ? I am in a marginal area, and I can just resolve QAM16 signals, but the background noise defeats the finer discrimination needed to decode QAM64. The result is that I cannot get any ITV channel or Channel 5 (maybe not such a bad thing!). Whilst I am resigned to upgrading my aerial system, I would like to know the technical reason for making this decision on multiplexer coding.

I have recently purchased a freeview tv for my aunt in Cambridge and last night (11th Aug) I got most channels except ITV, Channel 4 and Channel 5 - is there a reason for this?

Many thanks

Sarah Palmer: This is the "usual problem" - please see Two frequency interference
| ukfree.tv - independent digital television and switchover advice, since 2002

I've just plugged in my freeview box and whilst I can see the menu for all 75 channels, I can't see any pictures when I click ok. Nothing happens it just stays on the menu screen. The little black box within the screen also stays blank whilst I scroll through the channel choices. any ideas what I'm doing wrong. I live at postcode CA11 OBZ so should have a signal - aerial on roof needing upgrading maybe (it looks knackered!)
Appreciate any advice.
Lisa (map)

lisa: This doesn't sound quite right... can you try My Freeview box has no EPG, is missing Film4, Channel 4+1, no sound on ITV3 or the channel line up is wrong | ukfree.tv - independent digital television and switchover advice, since 2002 ?