21. Four separate frequency tunings ( IFs ) are available to produce 4 x 100 MHz intermediate frequency bands. 22. These original designs can be divided into two classes of terminal units : audio-type and intermediate frequency converters. 23. One of these will be at the intermediate frequency ( IF ), and will be selected and amplified. 24. Ferrite-core transformers are widely used in ( intermediate frequency ) ( IF ) stages in superheterodyne radio receivers. 25. Such a stage accepts as input the antenna signal, and provides an output to the intermediate frequency amplifier. 26. Alternatively, a signal may be intentionally oversampled without an intermediate frequency to reduce the requirements on the anti-alias filter. 27. The LNB is a combination of low-noise amplifier, frequency mixer, local oscillator and intermediate frequency ( IF ) amplifier. 28. In more complicated transmitters which are called superheterodyne, the information signal modulates an intermediate frequency ( IF ) signal. 29. Again after a simulcast of 94.5 ( WRAS FM 88.5, which overlaps its 10.7 MHz intermediate frequency centered on 88.6. 30. Some forms of balancing selection do not result in fixation, but maintain an allele at intermediate frequencies in a population.
