I suspect you are confusing a poor signal with interference. Unplug the RF input cable , if the pic does not improve it's not int. to check plug a lead from the modulators RFout to the Tv next to it & tune it to the appropriate channel eg 21 Make sure there is nothing in the RF input. If that is ok plug in the RF input, if it's still ok ( as I suspect) then there is something wrong in the cabling to the room
I dont know where you get your info from but this is wrong.
In NZ we use 21~69
I think you'll find we don't transmit on CH 21 -25 as its outside band allocation. http://www.rsm.govt.nz/cms/tools-and-services/publications/public-information-brochures-pibs/pib-21-table-of-radio-spectrum-usage-in-new-zealand-1/2.-the-new-zealand-table-of-allocations/2.3-new-zealand-table-of-allocation/2.3.5-uhf-band-300-3000-mhz http://www.nzart.org.nz/info/technical/nz-tv-channel-frequencies/
You are correct about TV tuning though. I've now found out that my TV and Recorder tuners do cover CH21 -69.
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