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DjShadow

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#22364 25-May-2008 20:34
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Hi all,

Parents have shifted into a new retirement complex in matamata, in the whole sub division they have put in the body corp rules that none of the brand new units are to have antennas on the roof, however they have putdown a cable tv network covering the whole complex, where at the central point (the clubhouse) there is a 90cm dish plus VHF/UHF antennas feeding the network. When I tuned in the TV I quickly realised all the FTA channels with the exception of prime and Sky UHF are being fed via Freeview as all the channels except tv3 are being retransmitted in analouge on the UHF band in 16x9 (hence on the olds 4x3 screen it looks squashed) and they are also rebroadcasting TVNZ Sport Extra down the cable also. Channels are only being spaced 2-3 channels apart on the UHF band and I have a feeling they will be clashing with the DVB-T digitial channels being transmitted from Mt Te Aroha. The Cable network also has a satellite feed from Optus D1 being sent down it also so residents can get Sky Digital and I assume Freeview DVB-S.

My question is, is it possible to relay the 3 DVB-T channels down the cable network and would they need to match the exact UHF channels that are being used on Mt Te Aroha for it to work (i.e if say channels 57 is being used, does it have to be on channel 57 on the cable network?). Only reason I'm asking is if I tune my TV normally on UHF band it doesn't see any distortion around the channels where freeview is being transmitted.

thanks.

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cyril7
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  #133247 26-May-2008 09:36
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Hi Carl, MATV systems can be constructed in various manners, typically a channel processor will filter out only the wanted channels or groups of channels to attempt to eliminate outof band rubbish from entering the system. Now with the advent of the FreeView Satellite service it is becoming more common to use transmodulators (DVB-S > RF PAL) or similar arrangement for all the channels and only pickkup the minimum of off air channels (Prime) as it allows for a more controlled setup.

So it is quite possible that the UHF DTT muxs of Te Aroha are infact not getting through the channel processor. Many of these processors have quite flexible configurations to allow various groups of channels to be let into the network. It may be work talking to the company who installed the system (complex admin should know who to call if it breaks down) and see if they can add the DTT muxs into the filter pass.

Alternativley if you want good pics but they wont come to the party on adding the DTT muxs, get a DTH (DVB-S) Freeview box and connect that to the LBand feed on the network.

Cyril

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