Home › Forums › temp › 50,000 uV/m at 3 meters legally…STL or control use. › Ham radio STL and repeater control
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It has been a few years since I was involved with ham repeaters so things may have changed since then. The predominant means of controlling or linking repeaters was on the 440 MHz. ham band which requires an amateur radio license. The restriction against music and the ID requirements for amateur radio would apply and therefore this would not be suitable for part 15 “broadcasting”.
The rules stated that the control link must not be on the input frequency of the repeater, hence for 2 meter repeaters, the 220 and 440 MHz. bands were popular. I used a land line with DTMF to control my repeater.
Part 15 allows the use of 10 MHz. microwaves for proximity sensing (such as door openers). There is available a “Gunnplexer” transmitter and hams have reported Q5 links of 6 miles line of sight with a 15 mW. unit. FM is easy using the built in modulator diode but receiver design can be a bit tricky. These units will tune to the part 15 10 MHz. band but I don’t know if the field strength or the application is legal. I thought I would mention it in case someone wishes to pursue it.
So far the 930 MHz. link I described earlier is working great. I haven’t done any drive-arounds yet to determine the range, but it works for what I am trying to do.