GB3HM

A pair of low band Philips FX5000 repeaters have been modified (so we have a spare) giving a receive sensitivity better than 0.18uV for 12db SINAD and a programmable output power from ten to fifty watts. Our output power is currently set at 14dbW (25W). The logic board has been developed to fit in place of the original RCM PCB inside the control unit, consequently no external logic is required. All logging, configuration, status and functional commands are done via the serial RS232 connector on the rear of the repeater chassis. The microprocessor is a Microchip 16F1947 running at 32MHz. This has sufficient power for a multitasking environment and concurrently serves the repeater logic, IIC clock module, two bi-directional serial ports, DTMF decoder, two independent software Morse code generators, 1750Hz tone decoder and a host of internal time-slice and timed functions. Fittings and connectors are available for future expansion. The receiver and transmitter driver modules each have..

Primary location: United Kingdom