Simplex Gateways

Introduction

MB7INM are FM simplex analogue gateways located in Oswaldtwistle, Lancashire. The NOV holder for both is M0NFI.

MB7INM 2m gateway with a TX/RX frequency of 145.2875 MHz and a CTCSS access tone of 82.5Hz.

MB7INM 4m gateway with a TX/RX frequency of 70.3875 MHz and a CTCSS access tone of 82.5Hz.

Operating

All simplex gateway nodes are licenced for narrow deviation only so please make sure your radios are set to narrow. If you operate your radio in wide deviation mode you could cause distortion and your signal may be dropped by the gateway radio. Leave a gap of four 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 their operational states. 

When you transmit into the repeater and it's connected to another node, as you unkey, the gateway will reply with a morse K (dah-dit-dah) with a higher frequency of 1200Hz.

When you transmit into the repeater and it isn't connected to another node, as you unkey, the gateway will reply with a morse K (dah-dit-dah) with a lower frequency of 800Hz.

When a remote user on the network ends transmission you will hear a morse I ( dit-dit).