Digital data and analog radio frequency transmitter

Details Digital data and analog radio frequency transmitter Digital data and analog radio frequency transmitter

1990-06-01

1991-04-23

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Frequency conversion

375 62, 332100, H04B 104, H04L 2712

Patent

active

050105850

ABSTRACT:
A digital Non Return to Zero (NRZ) and Frequency Modulated (FM) radio transmitter intended but not unique to, for the transmission of Digital, Tone Only or Tone and Voice paging messages is described. This transmitter is built on the concept that the separate signals required are individually constructed, and then combined together into the actual RF output. This provides for optimized circuitry for each particular function for the highest performance. There is no reason for compromising the performance of a particular function, and the implementation of the modulation and synthesis with direct digital technology provides extremely linear and fast radio performance at no extra cost. Maintenance is also simplified since the individual blocks can be troubleshooted and repaired (or replaced) requiring a minimum of down time.

REFERENCES:
patent: 4461013 (1984-07-01), Lese et al.
patent: 4481489 (1984-11-01), Kurby
patent: 4486846 (1984-12-01), McCallister et al.
patent: 4682123 (1987-07-01), Loper et al.
patent: 4682344 (1987-07-01), Somer
patent: 4746880 (1988-05-01), McCune, Jr.
patent: 4813040 (1989-03-01), Futato
patent: 4912773 (1990-03-01), Schiff
Zavrel, Robert J., Jr., "Digital Modulation Using NCMO", RF Designs, Mar. 1988.
McCune, Earl W., Jr., "Digital Communications Using Direct Digital Synthens", RF Designs, Jan. 1990.

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