(0)H04B:2/2:
IPC6
SECTION H - ELECTRICITY
TRANSMISSION
H04B
3/3
<<   >>   H04B007/00 - H04B017/00  

7
/ 00 Radio transmission systems, i.e. using radiation field (H 04 B 10/00, H 04 B 15/00 take precedence)

7
/ 005 • Control of transmission; Equalising [3]  

7
/ 01 • Reducing phase shift [3]  

7
/ 015 • Reducing echo effects [3]  

7
/ 02 • Diversity systems (for direction finding G 01 S 3/72; aerial arrays or systems H 01 Q)  

7
/ 04 • • using a plurality of spaced independent aerials  

7
/ 06 • • • at transmitting station  

7
/ 08 • • • at receiving station  

7
/ 10 • • using a single aerial system characterised by its polarisation or directive properties, e.g. polarisation diversity, direction diversity  

7
/ 12 • • Frequency-diversity systems  

7
/ 14 • Relay systems (interrogator-responder radar systems G 01 S 13/74) [2]  

7
/ 145 • • Passive relay systems [2]  

7
/ 15 • • Active relay systems [2]  

7
/ 155 • • • Ground-based stations (H 04 B 7/204 takes precedence) [2,5]  

7
/ 165 • • • • employing angle modulation [2]  

7
/ 17 • • • • employing pulse modulation, e.g. pulse code modulation [2]  

7
/ 185 • • • Space-based or airborne stations (H 04 B 7/204 takes precedence) [2,5]  

7
/ 19 • • • • Earth-synchronous stations [2]  

7
/ 195 • • • • Non-synchronous stations [2]  

7
/ 204 • • • Multiple access [5]  

7
/ 208 • • • • Frequency-division multiple access [5]  

7
/ 212 • • • • Time-division multiple access [5]  

7
/ 216 • • • • Code-division or spread-spectrum multiple access (spread spectrum techniques in general H 04 B 1/69) [5]  

7
/ 22 • Scatter propagation systems  

7
/ 24 • for communication between two or more posts (for selecting H 04 Q 7/00) [2]  

7
/ 26 • • at least one of which is mobile [2]  
 

 10
/ 00 Transmission systems employing electromagnetic waves other than radio waves, e.g. light, infra-red (optical coupling, mixing or splitting G 02 B; light guides G 02 B 6/00; switching, modulation, demodulation of light beams G 02 B, G 02 F; devices or arrangements for the control, e.g. modulation, of light beams G 02 F 1/00; devices or arrangements for demodulating light, transferring the modulation or changing the frequency of light G 02 F 2/00; optical multiplex systems H 04 J 14/00) [5]

10
/ 02 • Details [5]  

10
/ 04 • • Transmitters [5]  

10
/ 06 • • Receivers [5]  

10
/ 08 • • Equipment for monitoring, testing or fault measuring [5]  

10
/ 10 • Transmission through free space, e.g. through the atmosphere (H 04 B 10/22, H 04 B 10/24 take precedence) [5]  

10
/ 105 • • specially adapted for satellite links [6]  

10
/ 12 • Transmission through light guides, e.g. optical fibres (H 04 B 10/22, H 04 B 10/24 take precedence) [5]  

10
/ 13 • • using multimodal transmission [6]  

10
/ 135 • • using single mode transmission [6]  

10
/ 14 • • Terminal stations [5]  

10
/ 142 • • • Coherent homodyne or heterodyne systems [6]  

10
/ 145 • • • • Transmitters [6]  

10
/ 148 • • • • Receivers [6]  

10
/ 152 • • • Non-coherent direct-detection systems [6]  

10
/ 155 • • • • Transmitters [6]  

10
/ 158 • • • • Receivers [6]  

10
/ 16 • • Repeaters [5]  

10
/ 17 • • • in which processing or amplification is carried out without conversion of the signal from optical form [6]  

10
/ 18 • • Arrangements for reducing or eliminating distortion or dispersion, e.g. equalisers [5]  

10
/ 20 • • Arrangements for networking, e.g. bus or star coupling [5]  

10
/ 207 • • • using a star-type coupler [6]  

10
/ 213 • • • using a T-type coupler [6]  

10
/ 22 • Transmission between two stations which are mobile relative to each other [5]  

10
/ 24 • Bidirectional transmission (H 04 B 10/22 takes precedence) [5]  

10
/ 26 • • using a single light source for both stations involved [6]  

10
/ 28 • • using a single device as a light source or a light receiver [6]  
 

 11
/ 00 Transmission systems employing ultranosic, sonic or infrasonic waves
 

 13
/ 00 Transmission systems characterised by the medium used for transmission, not provided for in groups H 04 B 3/00 to H 04 B 11/00

13
/ 02 • Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy (line transmission systems with earth or water return H 04 B 3/00)  
 

 14
/ 00 Transmission systems not characterised by the medium used for transmission (details thereof H 04 B 1/00) [4]

14
/ 02 • characterised by the use of pulse modulation (in radio transmission relays H 04 B 7/17) [4]  

14
/ 04 • • using pulse code modulation (analogue/digital or digital/analogue conversion H 03 M 1/00) [4]  

14
/ 06 • • using differential modulation, e.g. delta modulation (conversion of analogue values to or from differential modulation H 03 M 3/00) [4]  

14
/ 08 • characterised by the use of a sub-carrier [4]  
 

 15
/ 00 Suppression or limitation of noise or interference (by means associated with receiver H 04 B 1/10 )

15
/ 02 • Reducing interference from electric apparatus by means located at or near the interfering apparatus (structural association with dynamo-electric machines H 02 K 11/00)  

15
/ 04 • • the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver, in a tape-recorder (reducing parasitic oscillations H 03 B, H 03 F; screening H 05 K 9/00 )  

15
/ 06 • • • by local oscillators of receivers  
 

 17
/ 00 Monitoring; Testing [2]

17
/ 02 • of relay systems [2]  

 

 

 
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