Hi Greg

> Anyone out there currently working on a PIC based Freq. Hopping Spread
> Spectrum (FHSS) radio project?
>
> I'm interested in a transceiver design that operates in either the
> 902-928 MHz or 2.4 GHz ISM bands

I have just finished a comercial spread spectrum 2.4 GHz radio modem project.

Power requirements: 16-80VDC <10W.
Serial communication: Full duplex asynch RS232 1200-115200 bps (std 9 pin
DSUB) with full handshake signals and receive and transmit buffers.
Network protocol: CSMA or TDMA with ARQ. Point to point or up to 16 networks
with 1 base and up to 255 remotes each.
Radio: 100mW or 10mW (FCC part 15.247 and ETS 300 328). Range indoors
150-400m, 1500m line of sight Outdoors (greater than 15km with gain antenna).
Size: 135*146*60mm rugged aluminum case.

Well, actualy we have used a OEM radio modem module from Digital Wireless
Corporation called WIT2400. Check out there wep page:

www.digital-wireless.com

This module contains all the radio parts and a synchronous/asynchronous
cmos level serial interface.

And Yes, I have included a pic in the design. A 12c508 to detect a break on the
serial line for more than 20ms which puts the radiomodule into configuration
mode. The configuratin mode can then be entered with a 3 wire RS232
connection (TX, RX and GND). The configuration mode normaly also needs
DTR or a power on/off sequence.
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Ruben Jvnsson
AB Liros Elektronik
Box 9124, 200 39 Malmv, Sweden
TEL INT +4640142078
FAX INT +4640947388
ruben@2.sbbs.se
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