GB7LF (D-star) was placed into service as intended in a stand alone repeater mode. So far coverage seems to be working as predicted.
Only using a 0dBd end fed dipole at present with reduced ERP of about 6W instead of 10W. Will be boosted at a later date when a 4 stack collinear with about 5dBd gain can be installed at the site.
Repeater radio is a Tait T800 series 1 modified for GMSK modulation and interfaced with a Satoshi GMSK DV adapter which currently provides stand alone repeater capability. Can be interfaced with an Internet connection to provide linking with other systems via suitable software.
The radio system uses a single antenna linked via a duplexer to the radio RX and TX antenna ports Receive the repeater on 439.5375 MHz and TX to it on 430.5375 MHz with a D-Star equipped or compatible radio.
Operation
To access the GB7LF repeater the D-Star radio must be programmed with GB7LF B (GB7LF space space B) in the RPT1 position to allow access, this being a UHF repeater. Anything else will not work. There is no time out in stand alone repeater mode, though when Internet linking is provided most systems have a 3 minute time limit for the over. D-Star does not use CTCSS. On access the callsign of the connecting station is forwarded plus any short personal details message included. On completion of the over the receiving radio will emit a short beep to denote completion of the transmission. Repeater periodic beacons are not used or required with the system.
When Internet linking is installed at a later date separate operating instructions will be provided which will be applicable to the software system used.
An NoV has been issued by Ofcom to provide an Internet link via a simplex DV gateway.