Intermediate Frequency - Commonly Used Intermediate Frequencies

Commonly Used Intermediate Frequencies

• 110 kHz was used in Long wave broadcast receivers.
• Analogue television receivers using system M: 41.25 MHz (audio) and 45.75 MHz (video). Note, the channel is flipped over in the conversion process in an intercarrier system, so the audio IF frequency is lower than the video IF frequency. Also, there is no audio local oscillator, the injected video carrier serves that purpose.
• Analogue television receivers using system B and similar systems: 33.4 MHz. for aural and 38.9 MHz. for visual signal. (The discussion about the frequency conversion is the same as in system M)
• FM radio receivers: 262 kHz, 455 kHz, 1.6 MHz, 5.5 MHz, 10.7 MHz, 10.8 MHz, 11.2 MHz, 11.7 MHz, 11.8 MHz, 21.4 MHz, 75 MHz and 98 MHz. In double-conversion superheterodyne receivers, a first intermediate frequency of 10.7 MHz is often used, followed by a second intermediate frequency of 470 kHz. There are triple conversion designs used in police scanner receivers, high-end communications receivers, and many point-to-point microwave systems.
• AM radio receivers: 450 kHz, 455 kHz, 460 kHz, 465 kHz, 470 kHz, 475 kHz, 480 kHz
• Satellite uplink-downlink equipment: 70 MHz, 950-1450 Downlink first IF
• Terrestrial microwave equipment: 250 MHz, 70 MHz or 75 MHz
• Radar: 30 MHz
• RF Test Equipment: 310.7 MHz, 160 MHz, 21.4 MHz