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From: lairdkb@mentor.cc.purdue.edu (Kyler Laird)
Newsgroups: sci.electronics
Subject: Re: Wireless Modem (RF data transfer units)
Keywords: wireless modem fm radio data
Message-ID: <9029@mentor.cc.purdue.edu>
Date: 29 Mar 91 13:32:19 GMT
References: <413@mixcom.COM> <1991Mar29.070109.11684@markets.amix.com>
Reply-To: lairdkb@mentor.cc.purdue.edu (Kyler Laird)
Distribution: usa
Organization: Purdue University
Lines: 46

Electronics 1 2 3 sells a nifty RF trans/recv pair that can transfer 12 bits
(8 ID code, 4 data).  They use an encoder/decoder paird that they also sell.
These units have a serial DATA IN/OUT line and demultiplexed address and data
in/out lines. 

I _think_ that you could take the encoder and decoder out of the circuit and use
the data lines for your own use.  The schematic for the encoder and decoder
shows an oscillator on each, but I can't find a speed rating.  I doubt that
300bps would be a problem.

Both units are board level and small (~1.5" x 4" - recv, 1.5" x 2" - trans ???).

TX-88 RF Transmitter	- uses a 'standard' 12V transmitter battery
RE-01 RF Receiver	- accepts one of 4096 (12 bits) codes
RE-99 RF Receiver	- accepts one of 256 (8 bits) codes, returns 4 bits data

Since you would be bypassing the decoder section, the receivers are essentially
identical.  It's a shame that there isn't one that just returns all 12 bits for
you to play with.

Manufacturer:	Ming Engineering & Products, Inc.
		977 S. Meridian Ave.
		Alhambra, CA 91803

		Voice: (818) 570-0058
		FAX: (818) 576-8748

Dealer:		Electronics 1 2 3 (division of Ming E&P, Inc)
		977 S. Meridian Ave.
		Alhambra, CA  91803

		Order: (800) 669-4406
		Voice: (818) 261-4065
		FAX: (818) 576-8748

Prices:		transmitter		$ 9.95
		receiver		$19.95
		pair			$29.95

These things look handy!  I'm planning on getting at least one pair.  They
look like they'd be good for all sorts of digital communication.  I'm 
interested in anyone's experience with them.

Good luck!

--kyler