VHF data modem/baseband data signal converter
Abstract
A full duplex data modem, used for transmitting digital data over tactical VHF FM radios, designed and built. The modem has two operating modes. In the quasi-analog mode it can transmit at 75, 150, 300, 600, 1200, 2400, and 4800 bps, using binary FSK, MSK, and four-level FSK. In the X-mode it can transmit at 300, 600, 1200, 2400, 4800, 9600, and 16000 bps, using Manchester, conditioned, diphase, pair-selected ternary, delay modulation, bipolar, and twinned binary codes. This report contains the theory of operation, implementation, and test data on two units.
- Publication:
-
Final Report
- Pub Date:
- May 1978
- Bibcode:
- 1978sigi.rept.....E
- Keywords:
-
- Modems;
- Radio Receivers;
- Signal Processing;
- Very High Frequencies;
- Circuit Diagrams;
- Data Transmission;
- Digital Systems;
- Frequency Modulation;
- Frequency Shift Keying;
- Communications and Radar