NEWS

The Lowestoft and Gt Yarmouth Repeater Group has a Nokia BSR450n base station repeater for sale.
This unit has been fitted with a matching ctcss module and G1YFF logic.
A new logic ship and be programmed with your repeaters Morse identity at the cost of postage.
The group would like £80.00 for this unit. 

Contact us for more information

 

 

We also have 2 x Philips F490 UHF repeaters for sale.  We're not currently sure if there is any logic but we can look at installing a M0JGX custom logic if interested. 

 

Contact us for more information

We feel the need to clarify some misinformation currently circulating internet forums regarding our TETRA repeater GB7TX.

 

 

PLEASE NOTE: Repeaterbook.com is wrong, GB7TX is listed as a DMR simplex node.  Using a DMR signal will not work with this repeater.

 

 

 

GB7TX is a Motorola* (Branded Cleartone*) CM5000 DMO repeater (Type 1A).  

That IS the repeater part. Mobile and handheld units register with the repeater and their transmissions are then "repeated" by the repeater. It is a single frequency, it receives on one time slot and transmits on another time slot. 

 

We use a Motorola* MTM800 to provide the linking. 

The MTM800 is connected to a Raspberry Pi 4 which is running Allstar with MMDVM and Analogue Bridge to connect the repeater to the Phoenix DMR network.  The Raspberry Pi also listens for SDS (Serial) messages from the MTM800 which it then passes (via a custom script) to the Pi to change talk groups.

The repeater default talk group is (DMR) TG844 which links GB7TX, GB7EB and GB7YL.  
You can use other Phoenix talk groups if you wish, they are user activated via SDS codes**.
Because Allstar is running in the background you can also connect to other Allstar or Echolink connections (via SDS**)
Please beware the repeater cannot connect to DMR and Allstar / Echolink at the same time.  This is to prevent non digital originating signals from being transmitted over the DMR network, TG9 will be displayed on the Phoenix K Dashboard.  It is also the reason why (currently) Allstar and Echolink connections are outgoing only, all incoming connections are rejected.

 

The CM5000 and MTM800 (with the PI) are housed in an old DR3000 repeater rack case. The MTR5800 possibly??  

 

What GB7TX isn't.

  • It isn't a DMR radio hooked up to a TETRA radio.  That would have to use another repeater to access the DMR network, GB7TX is directly connected.
  • It isn't a DMR Repeater.  Don't bother trying it won't work.  -  Search on the ETSI website for the DMR and TETRA specifications if you are in any doubt.
  • It isn't a simplex node / gateway (either DMR or TETRA), it is a repeater that uses two time slots, see above.

 



* Motorola is a trademark of Motorola Solutions
* Cleartone is a trademark of Cleartone PLC 

 

** We are currently reviewing the SDS codes to work in better with SVXLink TETRA repeaters.  SDS Codes will be published on the GB7TX page

 

 

 

 

 

 

 

We are aware of an occasional issue with GB7BE, our D-Star repeater in Beccles, where the repeater will stop responding. 

A 5am reboot was introduced a while ago as the DVRPTR (D-Star Modem) stops communicating with the Raspberry Pi after 30 - 36 hours.  The reboot considerably improved the reliability, however, occasionally the DVRPTR will still stop responding in the interim period.
When the repeater stops responding our live status dashboard still shows the repeater as being online, since both IRCDDB and APRS are still receiving heartbeats from the Raspberry Pi. In fact the Pi is still working as expected it just stops talking to the DVRPTR, this was proved when we linked GB7NB up to GB7EB as EB relayed REF001C to NB despite EB being "off-air".

The logs do not show anything obvious and would appear there are no issues.  We have posted this issue on various Pi-Star groups and the most common reply suggests purchasing new hardware, however we believe this is a software issue.  The main reason for suggesting new hardware seems to be the perceived advantage of having DMR as well as D-Star, where in our case this is of no advantage since the Motorola DR3000 DMR Repeater - GB7EB sits directly above BE and is licensed for more power.

 

We are going to try moving away from Pi-Star and create our own Repeater control using Raspbian with the D-Star Repeater and IRCDDB by G4KLX.  If this proves to be ineffective we will look at using the STM32 reserved for the backup repeater.

 

A STM32 would also give us access to Yaesu System Fusion (C4FM), P25 and NXDN. Although the recent poll of users we undertook showed there are no users of P25 or NXDN and all those that use Fusion use their own hotspot.

There was no standard "antenna" logo for LYRG in fact 4 different logos were in use.  We decided to standardise and create our own. 

The new antenna logo is made up of an L and Y.  


We hope you like it.

 

Live Repeater Status