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1 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYBSlide Set 8 Repeaters/CTCSS Chelmsford Amateur Radio Society & Essex.

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Presentation on theme: "1 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYBSlide Set 8 Repeaters/CTCSS Chelmsford Amateur Radio Society & Essex."— Presentation transcript:

1 1 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYBSlide Set 8 Repeaters/CTCSS Chelmsford Amateur Radio Society & Essex Repeater Group M3 Foundation Course Repeaters/CTCSS

2 2 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYBSlide Set 8 Repeaters/CTCSS Repeaters Repeaters extend ranges across counties, over hills etc esp. for handheld and mobile users. The UK has over 300 Voice and 40 TV Repeaters

3 3 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYBSlide Set 8 Repeaters/CTCSS Repeaters - Introduction Foundation Syllabus requires only a limited knowledge of CTCSS and how to access a repeater. These slides enhance this as M3s will find Repeaters useful as they extend their range at VHF/UHF, and when mobile. All repeaters are run under special permits/NoVs from the RA/RSGB/RMC

4 4 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYBSlide Set 8 Repeaters/CTCSS Repeater Coverage Coverage by 2m and 6m Repeaters On 70cms there are lots ! TV is mainly on 23cms 2m 6m

5 5 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYBSlide Set 8 Repeaters/CTCSS Accessing Repeaters Repeaters have a frequency shift between Input and Output so they can transmit at the same time as receiving and have ‘Logic’ for control, Morse idents etc –On 2m Shift is 600kHz, –On 70cms Shift is 1.6 or 7.6MHz The shift direction varies with different bands - Up or Down Standards require access by 1750Hz Toneburst or CTCSS, and requires your callsign on every over. Best to set Local Repeaters up in Radio Memories Repeaters Timeout and cut audio - keep overs to 2mins!

6 6 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYBSlide Set 8 Repeaters/CTCSS Repeaters In Essex Repeaters in central Essex run by Essex Repeater Group 2m GB3DA, 70cms GB3ER, 6m GB3DB, 23cms GB3ZP (soon) ERG website: Repeaters are not funded by the RSGB, they are run by volunteers. Regular users are encouraged to subscribe to repeater groups to help pay running costs, insurance etc In North Essex repeaters are at Clacton/Braintree

7 7 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYBSlide Set 8 Repeaters/CTCSS CTCSS CTCSS - Continuous Tone Coded Squelch System A more modern alternative to 1750Hz Audio Tone burst CTCSS is mandatory on 6m systems and newer repeaters A low frequency tone is continuously transmitted as part of your Audio (almost sounds like faint mains hum) A range of precise tone frequencies are defined and repeaters will only accept their official tone to block interference. Repeaters also put CTCSS on their outputs, so users own radios can ignore unwanted signals.

8 8 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYBSlide Set 8 Repeaters/CTCSS CTCSS Frequencies Each County in the UK nominally has a Tone allocated to it Example: Essex is Tone-H 110.9Hz, but check as sometimes there are exceptions (eg in Clacton) Tone A = 67.0HzTone B = 71.9Hz Tone C = 77.0HzTone D = 82.5Hz Tone E = 88.5HzTone F = 94.8Hz Tone G = 103.5HzTone H = 110.9Hz Tone J = 118.8Hz

9 9 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYBSlide Set 8 Repeaters/CTCSS CTCSS Map Nominal allocations:- There are exceptions Check Repeater Details on RMC website or RSGB Yearbook

10 10 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYBSlide Set 8 Repeaters/CTCSS GB3DA/GB3ER 2m/70cms Radios, Cavities & Logic

11 11 Chelmsford Amateur Radio Society M3 Foundation Licence Course Murray Niman G6JYBSlide Set 8 Repeaters/CTCSS GB3DB - 6m Nice But Pricey ! 6 Cavity Procomm Duplexer:- 3 on Tx 3 on Rx TxRx PSU Logic


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