search

cnlohr / channel3

ESP8266 Analog Broadcast Television Interface
Other
1.49k stars 159 forks source link

Broadcasting POCSAG over VHF? #19

Closed r1bnc closed 5 years ago

r1bnc commented 5 years ago

Can esp8266 be reprogrammed to broadcast POCSAG messages over 169.7000MHz VHF? For the raspberry pi this is the project: https://github.com/F5OEO/rpitx

ghost commented 5 years ago

no, it can't, because the i2s peripherals allow a max of 80mhz.

r1bnc commented 5 years ago

thanks

cnlohr commented 5 years ago

It is technically possible to transmit very weak signals at that. There is a very small amount of energy left, despite the 80 MHz bit rate. Remember 62.5 MHz is ABOVE the maximum of 40 MHz this system can make. It's just that the emitted frequencies mirror AROUND that 40 MHz. Just a prohibitively small signal.