M0NFI Simplex Gateways

Introduction

MB7INM and MB7ANM are FM simplex analogue gateways located in Oswaldtwistle, Lancashire. Both can only be accessed using a CTCSS tone to prevent unwanted interference.

MB7INM is a 2m gateway with a RX/TX frequency of 145.2875 MHz and a CTCSS access tone of 82.5Hz, it is an unattended gateway and will be operational 24 hours a day.

MB7ANM is a 4m gateway with a RX/TX frequency of 70.3875 MHz and a CTCSS access tone of 82.5Hz, it is an attended gateway so will not be operational 24 hours a day.

 

Operating

Both nodes are licenced for narrow deviation only so please make sure your radios are set to narrow. Leave a gap of a couple of seconds between overs to allow all linked nodes to reset and for anyone else to join in. Before transmitting into a gateway please listen for a while to make sure it's not in use or if it is in use that you have determined if the gateway you wish to operate in being used by someone else. Two people can use the same gateway to talk with other users but as it's only simplex you will be hearing the other local user directly from their radio to yours. The tones from the gateway assist with determining who is operating from where.

 

Gateway Tones

Several tones are used by the gateways to indicate there operational states. 

When you transmit into a local gateway that it connected to another gateway, as you unkey the gateway will reply with a morse K.

When you transmit into a local gateway that is not connected to another gateway, as you unkey the gateway will reply with a single low tone.

When a remote user on the network ends transmission you will hear a single high tone.