Author - John M. Franke

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John M. Franke	Write for Electronic Design
John M. Franke is a senior technologist with TeCC, Yorktown, Va. He holds a BSEE and an MS in physics from Old Dominion University, Norfolk, Va. Email address: jmfranke@cox.net
1 results found for John M. Franke, displaying items 1 - 1

August 28, 2008 [Ideas For Design]
Narrow-Shift Digital Discriminator Detects Differential GPS Corrections
The U.S. Coast Guard transmits differential corrections to GPS signals (DGPS) via low-frequency (285- to 325-kHz) beacons. Transmission data rates are 100 or 200 bits/s. The modulation is minimum-shift keying (MSK), resulting in a pseudo frequency-shift keying (FSK) with a carrier shift of half the bit rate. For a 100-bits/s signal, the carrier shift is only ±25 Hz. With a receiver IF frequency of 1 kHz, the IF signal shifts between 975 and 1025 Hz. The...