VHF Frequencies for scanner.

Hi,
I have recently downloaded a list of NZ VHF frequencies, the source of which was provided by another TM M/Board participant - thank you.
One thing I am curious about is - some channels have more than one frequency. They have one under the column heading "Ship Transmit MHz" and another under the column heading "Ship Receive MHz".
Can anyone please explain this to me. ? Which (both? ) should I program into my scanner. ?
Many tks.

geek_south9, May 20, 2:18 pm

Repeaters use 2 frequencies, one is the input frequency (receive) or ship transmit and the other is transmit or ship receive. You normally listen to the transmit frequency because the repeater is normally located in a good position (on top of a hill for instance) and retransmits what it can 'hear' or receive.

It retransmits at the same time as it receives so the frequency must be different.

geek_ians2, May 20, 2:28 pm

geek_amphipod, May 20, 5:27 pm

As above, its a repeater frequency to increase coverage. They are located at remote sites. Here is one I built up and installed on top of a hill. This is one of the Marine emergency ones :)

Works like this http://www.g4prs.org.uk/Foundation%20Course%20Material/Repeaters_files/image004.gif Repeater 1 - Not me in photo though ;) https://www.flickr.com/photos/stevehn787/17850432661/in/dateposted-public/
Repeater 2 https://www.flickr.com/photos/stevehn787/17227454524/in/dateposted-public/ Repeater 3 https://www.flickr.com/photos/stevehn787/17662156658/in/dateposted-public/

geek_shall, May 20, 7:22 pm

oh and you need Ship Receive programmed in

geek_shall, May 20, 10:42 pm

Tks to all who contributed to my understanding of the dual frequencies per channel- appreciated !

geek_south9, Nov 1, 9:59 am

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