INDEPENDENT SIDEBAND TRANSMITTER

AMPLITUDE MODULATIONPRNCIPLES OF COMMUNICATION

BSECE – 4C

• Independent sideband (ISB) is an AM single sideband mode which is used with some AM radio transmissions. Normally each sideband carries identical information, but ISB modulates two different input signals — one on the upper sideband, the other on the lower sideband.

100-KHz LF Osc.

CH. A

CH.B

Balanced Modulator A

Carrier Reinsert Switch

Balanced Modulator B

BPF A

BPF B

Hybrid Network

Linear Summer

100-105KHz

95-100KHz

Balanced Modulator 3 Band Pass

Filter 3

Balanced Modulator 4 Band Pass

Filter 4

2.7 MHz MF Oscillator

25 MHz HF Oscillator