Quote:
Originally Posted by arjoll
Quote:
Originally Posted by rambo1152
Also note the larger jump between Ch 1 & Ch 2 compared to the others, that was to accommodate the DSB vision from the the original Alexandra Palace transmitter.
|
For some weird reason NZ had a similar gap between our channels 1 and 2, although we were always system B and I'm pretty sure never had a DSB transmitter!
Channel 1 - 45.25 / 50.75
Channel 2 - 55.25 / 60.75
Channel 3 - 62.25 / 67.75
and then band III channels 4-11 were 175.25/180.75 and up at 7 MHz spacing. Channels 1, 3, 5, 7 and 11 were in use here in Invercargill until DSO in 2013. |
Nothing too weird in fact.
For Region 3, into which NZ falls, the ITU 1947 Atlantic City meeting set Band I as covering 44 to 50 and 54 to 68 MHz. There were country-by-country exceptions added over time. In the NZ case, there was an exception to allow 50 to 51 MHz for TV broadcasting. This was recorded at the ITU 1959 Geneva meeting. I imagine that this exception was requested once it was decided to adopt the European 625/50 system with 7 MHz channel, later known as System B. This allowed channel NZ1 to span 44-51 MHz. Presumably doing it this way was a better overall fit with other spectrum user requirements than would have been assigning 47 to 54 MHz to NZ1, to make it contiguous with NZ2 and NZ3, and giving up 44 to 47 MHz.
Cheers.