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Maximizing Your Amateur Radio Reach with Repeaters

Learn how to access and utilize Repeaters to extend your range in the UK. Enhance your knowledge of CTCSS and access protocols with this informative course on VHF/UHF. Discover the ins and outs of Repeaters operations and coverage details. Join the M3 Foundation Course now!

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Maximizing Your Amateur Radio Reach with Repeaters

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  1. Chelmsford Amateur Radio Society & Essex Repeater Group M3 Foundation CourseRepeaters/CTCSS

  2. 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. 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. Repeater Coverage 6m 2m • Coverage by 2m and 6m Repeaters • On 70cms there are lots ! • TV is mainly on 23cms

  5. 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. Repeaters In Essex • Repeaters in central Essex run by Essex Repeater Group • 2m GB3DA, 70cms GB3ER, 6m GB3DB, 23cms GB3ZP (soon) • ERG website: http://www.essexrepeatergroup.org.uk/erg • 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. 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. 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 = 67.0Hz Tone B = 71.9Hz Tone C = 77.0Hz Tone D = 82.5Hz Tone E = 88.5Hz Tone F = 94.8Hz Tone G = 103.5Hz Tone H = 110.9Hz Tone J = 118.8Hz

  9. CTCSS Map • Nominal allocations:- • There are exceptions • Check Repeater Details on RMC website or RSGB Yearbook

  10. GB3DA/GB3ER 2m/70cms Radios, Cavities & Logic

  11. Rx Tx Logic PSU GB3DB - 6m 6 Cavity Procomm Duplexer:- 3 on Tx 3 on Rx Nice But Pricey !

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