Quote:
Originally Posted by robinshack
However, had the DTI (in those days) known of this unofficial mod they would have had a fit!
Rob
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Reminds me of a fudge I did on a late-1980s Pye MX290-based 5-tone system: 'officially' it was not allowed but I fudged together a setup so I could strobe-through all our tone-combos to issue an 'answerback' poll. The idea being to see which of the mobiles were in-signal-range using the auto-response, and then wait to see how long each of them acknowledged [by a human pressing the 'ACK' button on the radio] to being polled.
I had a then-novel "IBM PC" to drive this, feeding a wirewrapped tone generator fed from the PC's 8-bit-parallel 'centronics' printer-port. 5 pins to define the tones-to-send, one pin to key the transmitter.
It worked well as a way to keep the 'field fleet' on their toes; alas I'd forgotten that some of them working in rural/forestry tasks had their radios set up to sound the horns on their vans when 'pinged'.
And due to a mistake the system once did its polling at something like 02:00z.
Not good if your van's parked outside your house.