Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent
1995-04-13
1996-12-31
Pham, Chi H.
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
455 331, 455 93, H04B 7005, H04B 726
Patent
active
055904025
ABSTRACT:
A dual-mode transmitter (100) adjusts a signal's deviation level when switched between a wideband mode and a narrowband mode of operation. The transmitter (100) automatically attenuates the deviation of the signal based on a ratio of the maximum deviation level for the wideband mode to the maximum deviation for the narrowband mode utilizing wideband
arrowband maximum deviation adjust circuitry (115). Because the attenuation based on the ratio of the maximum deviation levels is too large for a narrowband mode signal having average deviation, the signal is amplified based on a ratio of the average deviation level for the wideband mode to the average deviation for the narrowband mode utilizing wideband
arrowband average deviation adjust circuitry (103). Attenuation and amplification of the signal's deviation occur when the dual-mode transmitter (100) is operating in the narrowband mode.
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Syntor X High-Band Radio, Motorola Mobile Products Division, Manual No. 68P81060E05-B, Motorola Technical Publication Services, 5555 North Beach Street, Ft. Worth, TX. 76137, printed in the USA.
Budlong Allan
Huslig Dan
Samson Randall J.
Motorola Inc.
Pham Chi H.
Sonnentag Richard A.
Vo Nguyen
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