Accessing GB3NM
To access the repeater you will need an FM transceiver capable of UHF
Output frequency : 433.175Mhz
Input frequency: 434.775Mhz
CTCSS: 71.9Hz
Tone burst enabled: 1750Hz
Status: On-Air!
Please note: In order to operate the repeater correctly you must have a +1.6Mhz offset programmed to automatically shift your radio over to the repeaters input frequency while transmitting – 434.775Mhz.
*Note this is a standalone talk-through repeater designed for local and wide area use via RF only!
G1SLE MK2 Logic (Standalone)
Time-out
The logic is fitted with a reasonable timeout which will switch off the transmitter if a signal is received continuously for an unreasonably long time. This timeout should never operate in normal use. If on the rare occasion the repeater does time out you will indeed know about it!
CTCSS & 1750hz Tone
Access to the repeater via RF requires at least one of two access features. CTCSS 71.9Hz sub audible tone or 1750Hz tone burst. CTCSS is the primary way of accessing the repeater via RF which helps reduce any opening of repeaters on adjacent frequencies or geological locations within the RF “over-lap”. It is a requirement by the NoV to have CTCSS as primary access to open the repeater. 1750hz tone burst is slightly different. Simple but effective at opening the repeater with 1750hz tone burst. This method is only required to initially open the repeater. The repeater can then be held open by carrier only. CTCSS 71.9Hz is also sent by the repeater transmitter when a signal is being received on the input, between overs the repeater stops sending CTCSS. This means that if you run your radio with CTCSS muting (tone squelch) you will only hear speech, never any confidence pips or Morse beacons. If you do want to hear the pips etc. switch off your CTCSS tone squelch decoder on your radio.
Access (RF)
The G1SLE MK2 Logic provides all logical control of repeat operation & functionality of the repeater. Developed by Richard Drabble G1SLE it is considered one of the best repeater controllers ever built with a very distinct sounding Morse & excellent through audio quality. Paired with the Nokia BSR 450LN rack mounted TX/RX unit it provide’s a basic talk-through repeater system with access by either 71.9Hz CTCSS or 1750Hz tone burst. When accessing the repeater from cold you should press the PTT and announce your callsign. This will give time for the repeater to activate and prepare a signal report in Morse. Once accessed you may use the repeater to make a QSO leaving suitable gaps between overs. The repeater will announce it’s ident every 15 minutes while in QSO at a reduced volume along with a signal report in Morse after each over. When you have finished using the repeater, the signal report, followed by 6 ‘pips’ will announce and the repeater will shutdown.
“keying/kerchunking up” the repeater to ‘see if you are in’ without identifying yourself is considered inconsiderate and technically illegal.
Signal Report
When listening with your CTCSS decoder off you may notice that as a user stops transmitting the repeater sends a Morse S (di-di-dit) I (di-dit) or W (di-dah-dah). This is in fact a signal report – Strong, Intermediate or Weak. If you are consistently getting an S you may consider reducing transmit power, if you are hearing a W consider getting a better aerial!
Internet Gateway (Not available)
This repeater is stand alone talk-through repeater only. No plans are to link this to any wide area network.
“Enjoy, use, but don’t abuse. Re-established at the height of the Pandemic 2020”
-M0VUB, Shane”