🚀 go-pugleaf

In article <laird.727283315@stable.ecn.purdue.edu> laird@stable.ecn.purdue.edu (Kyler Laird) writes:
>From: laird@stable.ecn.purdue.edu (Kyler Laird)
>Subject: Re: Chips for wireless modem
>Date: 17 Jan 93 15:08:35 GMT
>rwb@alexander.VI.RI.CMU.EDU (Robert Berger) writes:
>
>>In article <1993Jan13.235419.11126@ads.com> pkenny@ADS.COM (Patrick Kenny)  
>>writes:
>>> I would like to build a simple wireless modem. Are there single chips
>>> to send/recieve radio signals, and modems in a package. Or is there a
>>> kit I can buy somewhere. Any help would be appreciated.
>
>This month's Computer Craft has an ad on the first page inside the cover
>for a transmitter/receiver pair for data communications.  Crystal or
>synth. tuned.
>
>>The Motorola 3356 is a single chip receiver that's used in pagers.
>
>>For xmit, you could use a circuit used in many wireless mikes; a
>>common base Colpitts oscillator with the data fed to the base to
>>produced FSK. I have gotten this to work at 56 Kbaud.
>
>This sounds great!  Where can I pick up schematics for something like
>this?  I've been looking for ages.  (I usually find bits and pieces,
>but I want everything in one place 'cause I don't feel comfortable
>troubleshooting RF electronics.)
>
>>If you have more money than time, several companies sell spread
>>spectrum wireless modems in the 902-928 Mhz bands. These are allowed
>>1W of total power and 4W of effective radiated power; depending on
>>bandwidth they can go tens of miles.
>
>I just noticed a new version shown in 73, but I got the feeling that
>it was just for in-building use.  If I could get one to go from my
>house (elevated, but no external antenna allowed) to work (about two
>miles away in valley, but on fifth floor) reliably, I'd be thrilled.
>
>How are such modems for mobile communication?  Can I pop one in my
>car and use it around town?
>
>Note:  I don't have my ham license (but I do have a Heathkit course
>certificate from many years ago), but will get my no-code license if
>that's what it will take to get into this stuff.
>
>Thanks for the info!
>
>--kyler
>
>P.S.  I think that if someone decided to put together kits for
>complete RF modems, they'd sell like hotcakes.  (Like the FM audio
>transmitters apparently do.)  Maybe someone does already and I'm
>just out of touch...
>modems


TI makes a great chip that allows up to 1200 baud transmit and receive from
one 16-pin device. The part number is TLM3105 or its predicessor TLM3101.

JTAYLOR@LOBBY.TI.COM