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- Path: sparky!uunet!cis.ohio-state.edu!zaphod.mps.ohio-state.edu!cs.utexas.edu!hermes.chpc.utexas.edu!news.utdallas.edu!corpgate!crchh327!bnr.ca!grier
- From: grier@bnr.ca (Brian Grier)
- Subject: Re: Radio Transmitter
- Message-ID: <1992Nov06.134655.7132@bnr.ca>
- Sender: news@bnr.ca (News on crchh327)
- Nntp-Posting-Host: 131.253.206.80
- Organization: Bell Northern Research
- Date: Fri, 06 Nov 1992 13:46:55 GMT
- Lines: 27
-
- >
- > 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
-