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If you would like to operate more than one unit, and you’d like to sync the units so they operate on exactly the same frequency, the Rangemaster would be your choice.
The Procaster has a number of cool features, but does not offer syncing.
From the Procaster web site:
“Multiple Transmitters – Synchronization
Many people ask if the Procaster can be synchronized such that larger areas can be covered using multiple transmitters. The answer is no – the Procaster was designed to be a “standalone” unit…”
From the Rangemaster web site
Need more range? It is possible to use more then one Rangemaster unit to cover more area. The easiest method is to spread them out over you area about 1/2 mile to 3/4 mile apart and synchronize the audio only. Because the units are crystal controlled and can be fine tuned to exact frequency this will work, they won’t heterodyne unlike PLL controlled AM transmitters. ”
Experimental broadcasting for a better tomorrow!