G4USP (MB7ILH)

Page last updated: 02/10/2014

Analogue Gateway

 

    The analogue gateway of MB7ILH is based around a Phillips FM1100 transceiver, a Raspberry Pi, and SVXlink software written by Tobias SM0SVX. On transmit the FM1100 transceiver output power is set to 0dBW (1 Watt) into a Groundplane antenna mounted 6m above ground level, whilst feedline and other losses equate to around 2.5dB bringing the transmit ERP to -2.5dBW (1/4Watt).

 

 

1) The FM1100 transceiver - configured as follows:

Configuration is relatively strait forward all be it a little tedious with a PDP (Portable Data Programmer) / FDP (Factory Data Programmer) as apposed to the CDP (Computer Data Programmer). Alas CDP's are somewhat scarce, requiring a specific ISA card for an IBM XT compatible PC as well as software. The PDP will do the job but each channel has numerous settings associated with it.

It took me around an hour to reconfigure my FM1100, but I made a particular point of clearing and disabling all but the one channel, just to ensure that the transceiver could never be accidentally changed onto the wrong channel and hence frequency.

Details of the Phillips Simoco FM1000 series transceiver including user guide and service / workshop manuals can be found here.

 

2) The control head - I have built a cut down version of the Basic Control Head, providing the following functionality:

Details of the modified control head I built based upon the Phillips Simoco Basic control head can be found here.

 

3) The Raspberry Pi - the RPi setup is headless, with SVXlink software package

 

4) The USB sound card - not a lot to say here, other than some are better than others

 

See also

 

 

 

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