Is This Technically Possible?

egal

Is it possible to receive different DTT TV channels from differerent transmitters on the same UHF channel? For example, at my location in Omagh, would it be feasible for me to receive the BBC channels from Brougher Mountain on UHF channel 30 AND the RTE channels from Holywell Hill, also on UHF channel 30?

dmm10000

possible to recieve - yes
possible to watch - no

because each will mess up and interfere with the other

danjo

Yes, you could feed the two signals to separate devices e.g. VCR's and then select the output from each VCR via a switch to the TV.

It would be essential to ensure a high level of screening between the antennas and the the feeder cables etc. but it would be technically feasible.

mrdtv

danjo wrote: »

Yes, you could feed the two signals to separate devices e.g. VCR's and then select the output from each VCR via a switch to the TV.

It would be essential to ensure a high level of screening between the antennas and the the feeder cables etc. but it would be technically feasible.

I understand there are nulls both ways to minimise interference. BTW it appears you will be covered by Divis high power DTT from 2013 according to Ofcom documents.

More Music

Technically it's possible, but in practice.............

egal

mrdtv wrote: »

BTW it appears you will be covered by Divis high power DTT from 2013 according to Ofcom documents.

Have you a link, please?

Mike 1972

An antenna rotator is another possibility but theyre not that common in this part of the world

lawhec

Technically possible - yes. Feasible for a domestic installation right now - it would be doubtful. To combine the two signals into the one downlead would require frequency shifting from the received signals from one aerial before diplexing. A frequency shifter for analogue reception might not be stable enough for DTT use though again I've never seen one in action for DTT so can't fully comment. It would be better to check if an alternative RTÉ NL site could be used, either Carin Hill, Truskmore or Clermont Carn.

BTW it appears you will be covered by Divis high power DTT from 2013 according to Ofcom documents.

Omagh town itself, from checking several different addresses on the Digital UK postcode checker, will receive better coverage from Brougher Mountain and Strabane; Divis is only expected to be available in a few patchy places and only then the COM multiplexes.

A more direct concern is that some people who can currently receive all six multiplexes from Brougher Mountain may have problems with reception from the COM multiplexes after DSO at Divis because the planned frequencies for the COM multiplexes from Brougher Mountain (with an ERP 1/10th of that for the PSB multiplexes) are the same as those for the PSB multiplexes from Divis which are due to be also on a taller mast. Several prediction checks for postcodes around Omagh show up a reduction in quality & marginal coverage of these multiplexes.

mrdtv

lawhec wrote: »

Technically possible - yes. Feasible for a domestic installation right now - it would be doubtful. To combine the two signals into the one downlead would require frequency shifting from the received signals from one aerial before diplexing. A frequency shifter for analogue reception might not be stable enough for DTT use though again I've never seen one in action for DTT so can't fully comment. It would be better to check if an alternative RTÉ NL site could be used, either Carin Hill, Truskmore or Clermont Carn.

Omagh town itself, from checking several different addresses on the Digital UK postcode checker, will receive better coverage from Brougher Mountain and Strabane; Divis is only expected to be available in a few patchy places and only then the COM multiplexes.

A more direct concern is that some people who can currently receive all six multiplexes from Brougher Mountain may have problems with reception from the COM multiplexes after DSO at Divis because the planned frequencies for the COM multiplexes from Brougher Mountain (with an ERP 1/10th of that for the PSB multiplexes) are the same as those for the PSB multiplexes from Divis which are due to be also on a taller mast. Several prediction checks for postcodes around Omagh show up a reduction in quality & marginal coverage of these multiplexes.

I am glad you highlighted this using local postcodes. Ofcom have a lot to answer for with the frequency planning: we are already seeing the consequences with the Caldbeck interference in East Down. Write to your MP or MLA.

egal

What's happening in east Down?

mrdtv

egal wrote: »

What's happening in east Down?

Interference between Caldbeck DSO muxes for COM channels and low power Divis DTT and in parts of Newtownabbey.