If you talking about synchronizing transmitters for simulcast, then that is done with an external reference oscillator (instead of the transmitter's internal ref Oscillator) at each site and that oscillator is locked by a GPS receiver to achieve very accurate frequency. Typically the external oscillator operates at some frequency like 16, 12.5 or 10 MHz but can be locked the GPS that puts out a 1 pps signal. Perhaps others can elaborate further. Jon VA3RQ On 2/25/2014 1:28 AM, Wayne wrote:
I've been doing a lot of reading and I haven't come across anything that talks about VCO locking. How does Allstar lock the frequency of each transmitter?
Thank you.
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