Here’s a recent discussion from Twitter:
Scott WZØW @Scott_WZ0W
@K0NR I’d like an LED panel in the rear window of my car that displays whatever frequency my 2m radio is tuned to.
@K0NR I’d like an LED panel in the rear window of my car that displays whatever frequency my 2m radio is tuned to.
BobW @K0NR
@Scott_WZ0W sounds like an Arduino project
@K0NR good idea!
Tony, KD8RTT @kd8rtt
@Scott_WZ0W @kb6nu @K0NR there are some cheap ebay frequency counters you could maybe pull an analog voltage from to determine after PTT
@Scott_WZ0W @kb6nu @K0NR there are some cheap ebay frequency counters you could maybe pull an analog voltage from to determine after PTT
Tony, KD8RTT @kd8rtt
@Scott_WZ0W @kb6nu @K0NR you could put the freq counter with a short “bad” antenna near the mobile antenna, it should just get your signal
@Scott_WZ0W @kb6nu @K0NR you could put the freq counter with a short “bad” antenna near the mobile antenna, it should just get your signal
Something similar was done in the 90s with a scanner/computer interface. The computer was hooked to a Motorola 68 series micro controller that read the LCD segments to get frequency and mode. The data was entered into a csv file to match with the captured audio files.
In this case only 3 digits need to be looked at and just the segments that would uniquely identify the number. Example – 5 and 6 have the same segment OFF and one that is OFF/5 and ON/6. Universal reader.