US3750027A
(en )
1973-07-31
Surface wave frequency discriminators
Armstrong
2006
A new system of short wave amplification
US2212338A
(en )
1940-08-20
Frequency modulation
WO1983000973A1
(en )
1983-03-17
High-sensitivity fm demodulating system
US2215284A
(en )
1940-09-17
Frequency modulation signaling system
BE479729A
(sr )
US2113976A
(en )
1938-04-12
Pseudo-extension of frequency bands
BE468034A
(sr )
US2320428A
(en )
1943-06-01
Oscillating amplifier and detecting system
US1972964A
(en )
1934-09-11
Communication system
US2218399A
(en )
1940-10-15
Compensating network
EP0720315B1
(en )
1999-08-04
Method for narrow band frequency modulation or phase modulation; transmitter and receiver for carrying out the method
WO2004040755A1
(ja )
2004-05-13
フィルタ回路及び無線装置
Ens et al.
2015
Piezoelectric transceiver matching for multiple frequencies
US2544311A
(en )
1951-03-06
Receiving system for electric waves
US20040086037A1
(en )
2004-05-06
Noise reduction apparatus
US12489469B2
(en )
2025-12-02
High efficiency non-pulse width modulation communications system and method
US1910399A
(en )
1933-05-23
Wave signaling system
US2165252A
(en )
1939-07-11
Phase modulation receiver
JPS6155834B2
(sr )
1986-11-29
US1968335A
(en )
1934-07-31
Radio receiving apparatus
US1904605A
(en )
1933-04-18
Crystal rejector circuit
US1733824A
(en )
1929-10-29
High-frequency signaling system
US1653878A
(en )
1927-12-27
Electric wave signaling system
US1932397A
(en )
1933-10-31
Art of radiosignaling