I'm working on a project at my school to try and make a transmitter that works on the same 457 kHz frequency as an avalanche beacon as a training aid. Before someone tells me to google it, I already have and come to find out the specifications for the transmitter:
Transmit frequency: 458±.1 kHz
Modulation: A1A (carrier on/off)(some form of pulse modulation, I can't tell which, let alone find any pulse circuits)
Period: .9±.4 seconds
Active minimum: 70 ms
Passive minimum: 200 ms
The problem that I am running into is the fact that I cannot find a circuit that is for a pulse device that has a set period like an avalanche beacon does, therefore does not take input.
Thanks for any help,