🚀 go-pugleaf

> 
> I need to make a simple radio frequency transmitter with the following
> characteristics: range of a few miles, transmit on a single frequency, 
> energy derived from a button cell, CHEAP.
> 
> Any ideas on how I can build something like that?  Would a simple crystal
> oscillator do?  
> 
> Thanks for your help.  Please email me at gn1@umail.umd.edu

You do not say if this will be a beacon, digital, or voice transmitter.
if all you want is a beacon then it's easy. Digital, and or voice and the
complexity goes up, along with power requirements.

Considering Hams running 0.01 watts can "talk", using morse code, around the
world, range is not a real problem. Receiver sensitivity, and propagation
are your real problems, though if you only care about a couple of miles
both HF and VHF will suffice. I would recommend VHF to make sure your signal
does not propagate around the world.

I would recommend getting a copy of 73 magazine and look for articles on QRP, 
less-than 5 watts, transmitters. Remember if you transmit with 0.1watts or 
more you will need a license.

Brian, WS1S
Bell Northen Research
Research Triangle Park, NC