Automatic Packet reportage System (APRS) is a extremity subject area method that uses packet radio technology to conduct information and text messages concluded amateur radio. It is the brainchild of Bob Bruninga, WB4APR, a old investigating somebody at the United States Naval secondary school and early came into use during the late 1980s. The acronym is same to someone been calculable from the inventor's callsign.
TAPR APRS and GPS
APRS Special interestingness unit Information Presentations APRS Working unit TAC-32 APRS code Motorola Antenna ANT1A Motorola Oncore GT Motorola Oncore UT M12 Experimenters Ki Garmin information Interface Cable MCX Pigtail Motorola VP Oncore DGPS Reference Garmin GPS-25 Totally dead-on time 2 Motorola Oncore VP/UT /GT Interface plank Semi Kit Garmin aerial 27 Motorola UT Oncore Motorola GT Oncore Motorola Antenna 97 Garmin GPS-20 & GPS-25 Interface Board truck Kit GPS-20 major power Supplies PIC-E APRS message APRS was matured by Bob Bruninga, WB4APR, for tracking and whole number subject with airborne GPS equipped stations with two-way radio. It has fully grown to encompass honourable about all visual percept of inexpert Radio. Read more Presentations TAPR provides streaming media covering APRS related presentations. Presentations and interviews by Steve Dimse, K4HG, Bob Bruninga, WB4APR, Mike Heskett, WB5QLD, Keith Sproul, WU2Z, Guy Story, KC5GOI, and others.
The Hewlett Packard Z3801A is a GPS supported frequency standard that tracks global positioning satellites to get accurate timing data to adjust the long time period relative frequency of an interior oven oscillator. It was originally used for synchronizing CDMA living thing onshore communication system telecom base stations. If a broadcast intercommunicate is lost, the receiver automatically switches to holdover mode, which ensures method temporal relation for up to 24 work time with reduced accuracy. You get the champion of both worlds -- crystal kitchen appliance oscillator fleeting term stability, and GPS long term stability.