Adam . . . . I guess it depends on what use the * RF * communications will be put to. Radio Shack has offered a large selection of * Remote Control * cars ,etc. and usually these are going to use some limited encoding , like is offered by * Holtek * parts. Moving up to producing a data link , may require a design using * RF * componants ( i.e. RFM Xceivers ) that have a faster rise / fall time of the modulation. I was faced with this recently and had a design that used a very narrow detection window. The majority of the parts that I came across ( for xmitting ) would operate with rise /fall times at about 100 to 150 usec. max. So , even though this timing might work for a 1 kbps , OOK transmission , if the receiver is looking for fast transistions . . . . . oops! The RFM 3001 ,3002 , 3003 are xmitting with rise /fall times that average 6 to 12 usec. and provide for up to 119 kbps. Steve -----Original Message----- From: Adam Bryant To: PICLIST@MITVMA.MIT.EDU Date: Tuesday, October 05, 1999 11:33 AM Subject: [OT] Tech America RF modules >All, >Browsing through the latest Tech America (now Radioshack.com) catalog, I >came across the following RF Transmit/Receive modules. As the question >of where to buy RF modules appears frequently on the list I thought I >would pass along this info FWIW. > >Cat #: 900-6896 Mfr's #: TX433 UHF Transmitter 433.92MHz $9.85 3-12v >operating voltage range, 200 meter range. >Cat #: 900-6895 Mfr's #: RX433 UHF Receiver 433.92MHz $9.95 4-5.5v >operating voltage range. > >If anyone has used these modules, please provide us some feedback. These >look perfect for a semi-autonomous (a la Mars Sojourner) robot I have >been thinking about building (PIC based, of course). > >Adam Bryant (age 0x23) >abryant@peaktech.com (work) >adamdb@juno.com (home) >Parker, CO, USA >Robotics, RC Airplanes, anything using a PIC > >___________________________________________________________________ >Get the Internet just the way you want it. >Free software, free e-mail, and free Internet access for a month! >Try Juno Web: http://dl.www.juno.com/dynoget/tagj. >