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On 02/16/2022 2:13 PM Scott Miller <scott@opentrac.org> wrote:
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</div>If you were going to build a whole new system from scratch and set some minimum requirements, 9600 baud would be a good idea.
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<br>Several years ago I built a batch of magnetic mount trackers for ambulances and support vehicles at Burning Man. We had two dozen 9600 baud trackers on a single channel with a network cycle time of 6 seconds, and each tracker transmitted every position packet twice for a total of 8 packets per second. They were all received by a single TM-D710. The transmitters were half-watt modules on the 70cm band and I think they were maybe $20 each. They worked well and we could track ambulances until they disappeared into the hills about 15 miles away on their way to Reno.
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<br>Higher power radios tend to not have such a fast TXD though.
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Were these modules crystal-controlled? The fastest TxD radios (20mS and less)
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I've had are all crystal-controlled, with the lone exception of an MCX-100 with
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Fast-Lok synthesizer option, that was as fast as crystal-controlled.
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73,
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Dana K6JQ
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