"Nigel A. Gunn G8IFF/W8IFF" nigel@ngunn.net Subject: Re: [chirp_users] # of Channels To: Discussion of CHIRP chirp_users@intrepid.danplanet.com,

Hello Nigel (and everybody else),

The use of only 5 CTCSS codes in the UK might be true today, but might not be true tomorrow. License conditions and band-plans can and do change. I like to think ahead and, where appropriate, assume worst case conditions. After all, its only software.

73 all, Chris

________________________________ From: chirp_users-bounces@intrepid.danplanet.com chirp_users-bounces@intrepid.danplanet.com on behalf of chirp_users-request@intrepid.danplanet.com chirp_users-request@intrepid.danplanet.com Sent: 04 September 2018 19:00 To: chirp_users@intrepid.danplanet.com Subject: chirp_users Digest, Vol 117, Issue 3

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Today's Topics:

1. Re: # of Channels (Christopher F. Beesley) 2. Re: # of Channels (Nigel A. Gunn G8IFF/W8IFF)

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Message: 1 Date: Tue, 4 Sep 2018 03:03:44 +0000 From: "Christopher F. Beesley" chrisbees2@hotmail.com Subject: Re: [chirp_users] # of Channels To: "chirp_users@intrepid.danplanet.com" chirp_users@intrepid.danplanet.com Message-ID: AM6P194MB03737C5D792C4B99231F35538F030@AM6P194MB0373.EURP194.PROD.OUTLOOK.COM

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There has been a lot of discussion about this. I have another spanner to throw into the works: If you use CTCSS codes to activate repeaters then you might well end up using the same pair of repeater channels several times over but with different CTCSS codes. In the UK there were 38 different CTCSS tones available last time I looked, and 16 repeater channels on 2m. So you need 608 memories to deal with every possible combination of repeater channel and CTCSS code. That's for the UK, you might need a lot more in other parts of the world where the 2m band might be wider with more frequencies allocated to repeater use. Back in the UK, there are also 32 simplex channels, so the total is now 640 memories, and that's just for 'channelised' FM. Don't forget that some of those channels will be for data, TV, satellite, calling frequencies, etc. After that you've got the 'all-modes' sections to go at, but be very careful down there because a lot of the frequencies are also dedicated to data, TV, satellite, and calling frequencies. And don't let your wide-band transmissions stray into the CW area! 73, Chris, G4OUG