Hi guys
I couldn't really find a section on the forum for this question so I guess I will put it here
I do a lot of work in one of the local apartment hotels (an apart-hotel they call them here)
Mostly I am maintaining the equipment in the 'TV' room or at the pool bar
Anyway, I have a problem with the system in the TV room - most of this was a system I 'inherited' off the previous technician who no longer lives on the island
Basically they have (see pic it probably explains it better) the following system. The UHF cabling is daisy chained through all the modulators/transmodulators adding more DVB-T MUXes to the incoming Aerial Signal like so:
*Incoming DVB-T (Spanish TV) from TV Aerial (numerous MUXes)
* UHF Antenna Mast Head Amplifier
*Incoming UK TV from satellite 27.5W + 19.2E, 4 receivers connected to quad input DVB-T modulator outputs 1x DVBT Mux
* Incoming UK TV (19.2E), plus 3x IPTV (Sweden, Norway, Finland) connected to quad input DVB-T modulator outputs 1x DVBT Mux
* Dual Transmodulator German satellite TV 19.2E, outputs 2x DVB-T Mux
* Dual Transmodulator French satellite TV 19.2E, outputs 2x DVB-T Mux
* Quad Transmodulator German satellite TC 19.2E + Italy satellite TV 13E, outputs 4x DVB-T Mux
* Dual Transmodulator German satellite TV 19.2E, outputs 2x DVB-T Mux
* UHF Power Amplifer outputs all MUXes combined (approx 75 TV Channels to 120 apartments over 5 floors plus communal areas/restaurant/pool bar, via 'Cab boxes' on each floor
So all this was working fine..... until it seems there is a new terrestrial TV service on the same frequency (or adjacent frequency) as one of the MUXes on the Quad Transmodulator, causing four German TV channels to continually glitch/break up. I can prove this by disconnecting the TV aerial and the German channels are all OK then but obviously I have no Spanish TV.
So I can see two ways of fixing this - but both have their disadvantages
1: Retune the affected MUX to another channel frequency. The problem with this is that someone then has to go to all 120 apartments and re-scan the TVs. This means waiting for the apartments to be free so as not to disturb guests. Also this would most likely cause more channels to be added from the Spanish TV Aerial (assuming a new transmission caused the problem) which affects the channel order / channel numbers which then means having to reprint all the TV channel lists that go in a welcome folder in each apartment. Assuming it takes 15 minutes to visit each apartment, turn on the TV, re-tune it, change the channel listings in the folder, turn off the TV - then it is going to take 30 hours or more to complete the job. That's wages and time.
2. Fit a blocker or filter between the Aerial and the first DVBT Modulator (before or after the UHF Mast Head Amp) that removes the signal on that RF channel. This should work fine but I tried to google for such an item but the problem is I can't seem to find what I need, possibly due to not knowing exactly what to search for. Preferably something I can choose to select and block 1 UHF channel (channels 22-69)
3. Some other good idea I didn't think of?
Hopefully the attached pic shows better how this all works
Cheers
Rich
I couldn't really find a section on the forum for this question so I guess I will put it here
I do a lot of work in one of the local apartment hotels (an apart-hotel they call them here)
Mostly I am maintaining the equipment in the 'TV' room or at the pool bar
Anyway, I have a problem with the system in the TV room - most of this was a system I 'inherited' off the previous technician who no longer lives on the island
Basically they have (see pic it probably explains it better) the following system. The UHF cabling is daisy chained through all the modulators/transmodulators adding more DVB-T MUXes to the incoming Aerial Signal like so:
*Incoming DVB-T (Spanish TV) from TV Aerial (numerous MUXes)
* UHF Antenna Mast Head Amplifier
*Incoming UK TV from satellite 27.5W + 19.2E, 4 receivers connected to quad input DVB-T modulator outputs 1x DVBT Mux
* Incoming UK TV (19.2E), plus 3x IPTV (Sweden, Norway, Finland) connected to quad input DVB-T modulator outputs 1x DVBT Mux
* Dual Transmodulator German satellite TV 19.2E, outputs 2x DVB-T Mux
* Dual Transmodulator French satellite TV 19.2E, outputs 2x DVB-T Mux
* Quad Transmodulator German satellite TC 19.2E + Italy satellite TV 13E, outputs 4x DVB-T Mux
* Dual Transmodulator German satellite TV 19.2E, outputs 2x DVB-T Mux
* UHF Power Amplifer outputs all MUXes combined (approx 75 TV Channels to 120 apartments over 5 floors plus communal areas/restaurant/pool bar, via 'Cab boxes' on each floor
So all this was working fine..... until it seems there is a new terrestrial TV service on the same frequency (or adjacent frequency) as one of the MUXes on the Quad Transmodulator, causing four German TV channels to continually glitch/break up. I can prove this by disconnecting the TV aerial and the German channels are all OK then but obviously I have no Spanish TV.
So I can see two ways of fixing this - but both have their disadvantages
1: Retune the affected MUX to another channel frequency. The problem with this is that someone then has to go to all 120 apartments and re-scan the TVs. This means waiting for the apartments to be free so as not to disturb guests. Also this would most likely cause more channels to be added from the Spanish TV Aerial (assuming a new transmission caused the problem) which affects the channel order / channel numbers which then means having to reprint all the TV channel lists that go in a welcome folder in each apartment. Assuming it takes 15 minutes to visit each apartment, turn on the TV, re-tune it, change the channel listings in the folder, turn off the TV - then it is going to take 30 hours or more to complete the job. That's wages and time.
2. Fit a blocker or filter between the Aerial and the first DVBT Modulator (before or after the UHF Mast Head Amp) that removes the signal on that RF channel. This should work fine but I tried to google for such an item but the problem is I can't seem to find what I need, possibly due to not knowing exactly what to search for. Preferably something I can choose to select and block 1 UHF channel (channels 22-69)
3. Some other good idea I didn't think of?
Hopefully the attached pic shows better how this all works
Cheers
Rich
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