GPS Broadcaster: CW85

Description
The CW85 combines GPS technology
with WiFi transport. Incorporating
Navsync's own CW25 module with
ultrasensitive GPS receiver, the CW85
provides an 802.11b transmission
containing NMEA streams giving device
location (longitude and latitude) and
UTC time. The 802.11b supports WEP
encryption and is fully configurable to a
specific network.
CW85 GPS Broadcaster
Features
Sensitive GPS receiver with tracking as low as -185dBW
802.11b compliant
128 bit-WEP encryption
WPA encryption (not available in ADHOC mode)
Portable may operate on 6 AA alkaline batteries
Block Diagram
Operation
Upon power up, the CW85 will initialize and then will attempt to obtain a
valid GPS fix. The unit begins sending the GPGLL string prior to having an
accurate fix and continues to send out this stream until it is powered down.
The LED indicator is lit while the unit waits to recieve a GPGLL string from
the GPS reciever. The LED indicator then turns off briefly as the string is
transmitted via the WiFi transmitter. This behavior is repeated as long as
the CW85 remains on.
Cold start (ie - the first time the unit turns on and has no ephemeris or
almanac data) requires 35db or higher signal strength and 15 minutes
minimum on time to get current almanac and ephemeris data. After this
data is received by the module, low-level signal testing may be done.