I'd like to build a very small, low power RF transmitter circuit that is small and light enough (and cheap enough not to worry about) to be attached to a cats collar. I just want it to transmit either a constant or pulsed carrier (pulsed prob best for battery life) of a known frequency, that I can monitor with a receiver and DF antenna.
There must be single chip transmitters about these days?
...and I'm sure you have the ham radio license required for transmission in this band? And if you do, why are you asking the question in the first place?
I'd buy one of those $5, 418 Mhz transmitters. Then you need a PIC12F200 running in low power mode to send bursts of signal and extend the battery life.
No. it has to be on specified band segments. Wade through CFR 47 for all the regulations for the US. Most other countries have similar regulations and laws.
--
Service to my country? Been there, Done that, and I\'ve got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
Or you could look at Radio Control eauipnent - they seem to be allowed a decent range, and AFAIK they don't need licenses. Have you ever been to a place where a bunch of folks are flying RC planes? They each have a streamer attached to their antenna, and the color of the streamer corresponds to which freq. they're on in the channel - it's sort of a gentleman's agreement that they won't step on each other's signals.
I have no idea what the common frequencies are[1] - a cat would look a little funny with a 6' whip antenna sticking out of its collar. ;-)
Good Luck! Rich [1] ISTR somewhere around 27 MHz and somewhere around 49 MHz, but quote me at your own risk! :-)
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