South Yorkshire Repeater Group

Channel :RV53
Repeater Output :145.6125 MHz
Repeater Input : 145.0125 MHz
CTCSS : B-71.9Hz
Locator : IO93JK
IRLP : 5147
Echolink : 251071
Coverage map : Click here

Fingerprint Hardware and Software

The MoTron TxID? Transmitter FingerPrinting System removed from GB3NA to GB3YR, identifies individual transmitters using a patented technique based on the principle that carrier operated radio transmitters exhibit a unique frequency versus time start-up characteristic before stabilizing on the operating frequency. Carrier operated radio transmitters exhibit a unique frequency versus time start-up characteristic before stabilising on the operating frequency – even radios of the same make and model. This ‘FingerPrint’ can be captured, stored and analysed. Our exclusive TxID? Software, which can automatically match and compare up to 256 FingerPrints, and the patented technology of the TxID-1? IBM/Compatible circuit board will help us to identify the abusers on the repeater. An onboard fast squelch starts the FingerPrinting process. The voltage on the receiver’s discriminator is sampled, digitised and stored. The leading edge of the carrier is then captured, stored and displayed. Other information about the signal is also captured, including DTMF, CTCSS and DCS signals with separate peak deviation readings, and displayed with the FingerPrint. The TxID? System can optionally control a tape recorder, capturing all or part of the transmission on audio tape along with the digitally encoded FingerPrint data. Deviation measurements and Spectrum Occupancy features further enhance the system. The TxID? System works with the Receiver, the TxID-1? can also capture the frequency of operation, as well as set the frequency.

Guidelines  for using IRLP and echo link on GB3YR

1. Listen on the repeater network for at least 15 -30 seconds first to make sure a QSO is not in progress or the network is not linked to another Echo link, IRLP Node or Reflector.
2. Give your call sign before sending DTMF tones and trying to use the IRLP Node.
3. Assuming all is clear, identify your self and give the node name or number you wish to call, then enter the  code for the node and, release your PTT. GB3YR repeater should come up with a carrier as it waits for the connection to be authenticated. This can take a few seconds of dead-air so don’t be concerned.
   When the connection is confirmed, the voice ID of the destination node will be transmitted back to you as well as your nodes voice ID to the other repeater.
4. Once connected and after hearing the confirming voice ID, wait at least 15 seconds before transmitting as the remote repeater may be in use.
5. Use phonetics when first giving your callsign and name over the link. Press and hold the microphone PTT for a second and then announce your presence and your intention such as calling someone specifically or just looking for a QSO with another ham in that city.
6. Keep over’s short, remember the 180 second repeater timeout.
7. Always leave a 2-3 second pause between over’s to allow the remote node to unkey and reset the timeouts on the remote repeaters, this also allows other users to call in.
8. If no response is heard, announce your call and your intent to drop the link.
9. Do not link and unlink a remote node without saying anything. If you are testing a link please say so.

Operating IRLP node

Standard IRLP operating rules can be found here

1. The Internet Radio Linking Project is very easy and intuitive to use; please make sure you listen carefully to the voice prompts so you know what is happening the system gives messages about each action.
2. To use the GB3YR you need a radio with DTMF capabilities as well as 71.9 Hz CTCSS, and you need to have a good clear signal into the repeater. Please listen to the repeater for a while to get into the swing of how the system works.
3. Check the IRLP status page to find the Node number of a particular IRLP node.
4. ALWAYS listen before transmitting to ensure the system is not in use. If nobody is using the repeater, you can check the current link status by sending DTMF #0. This will announce whether the node is currently connected to another station, Idle, or Offline.
5. If the node is linked, and nobody is using it, you can bring it down by sending DTMF 73
6. Announce your callsign followed by the DTMF digits for the node you are calling. This will bring up an IRLP link. Once the link has been established, call as you normally would over the repeater network.
7. Keep overs short, remember the 180 second repeater timeout; please advise anyone you contact
   of the short timeout.
8. DTMF 73 is used to bring down the link once you have finished your QSO.

After bringing down the link, please announce your callsign.

Please let us know of any problems with the network
Thanks SYRG team