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...n, there are up to 13 signals that need to be routed in or out of the GPIO interface on the RPi. Buying an extender card early in the project reduces the chanc [[:File:PORTSDOWN INTERFACE SCH.pdf]].

...g an advanced multimode narrowband and DATV transceiver covering 70 MHz to 4 GHz for under £500. ...g a new build, the Raspberry Pi 4 Model B with 2 GB of RAM is recommended (4 GB or 8 GB or RAM will work, but costs more for no performance advantage).