Packet Radio

The Martello Tower Group operates the following AX25 packet radio stations.


To see pictures of the old ClackPak AX25 packet radio node from the late 80s/early 1990s, click here.


MB7UA is a simple standalone digipeater located at Point Clear, near St. Osyth in Essex (JO01mt).  It is purely a TNC and a radio running as a RELAY digipeater intended as a local fill-in for mobile APRS stations in the area.

MB7UA prior to installation on site

MB7UA prior to installation on site

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MB7UH is an APRS digipeater which is co-sited with the GB3CE repeater at the site of the Colchester General Hospital (JO01kv).  MB7UH runs 10 watts ERP from a dipole approximately 100ft above the ground.  The site itself is 260ft ASL.


The station operates 24/7 using UI-View32 on a PII-233 PC with AGWPE providing the interface to a Tiny-2 TNC feeding a Kenwood TM-261 radio.


MB7UH provides a much needed link along the A12 corridor and into Colchester.

MB7UH at Colchester Hospital

MB7UH at Colchester Hospital


MB7UIV was the first licensed gateway in the UK which provided a link between the internet and the UK packet APRS network on 144.800MHz.  It closed in June 2010 following over ten years of almost continuous operation.  MB7UIV was owned and operated by Keith, G6NHU who was well known for his involvement in the UK AX25 packet radio/APRS network in the early days.

MB7UIV returned on the 8th February 2017 as an RX only iGate, again operated by Keith, G6NHU.

Martello Tower Group, 2009-2017