HamRadioStuff < GuthrieFamily

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Jonathan is !KA8KPN, and has a web site at [[http://www.ka8kpn.org/][KA8KPN.org]]

APRS uses 1200 BPS AFSK on 144.39. I'm looking at doing a crystal-controlled transmitter for 9600 BPS !G3RUH modulation on 445.925. !G3RUH is FSK where the shift is exactly half the data rate, so the shift would be 4800 Hz, which should be well within the capabilities of "rubbering" the crystal, especially if I'm doing the sort of multiplication required to convert the crystal to the 70cm frequency.

Look at the and the KN990 HF QRP radio and KP990 power amplifier. The KP990 might be a good choice for use with the Hermes Lite 2.

-- Main.JonathanGuthrie - 20 Jan 2010

Topic revision: r2 - 2021-08-02 - JonathanGuthrie