The APF is especially useful when receiving CW, but is also useful in other modes as a tone control. APF is used to reduce interference from signals superimposed over a desired signal by adjusting the center frequency of the audio filter. It does so by adjusting the center frequency of the IF filter. IF shift is used to reduce interference from nearby signals. IF shift and APF (audio peak filter) functions are built in - a first for a receiver in this class. The crystal is the reference for the PLL and DDS circuits to achieve these specifications.

The IC-R8500 has superb high receive sensitivity over its entire range, and built in high quality crystal (TCXO) provides good frequency stability of less than +/- 10Hz below 30MHz less than +/- 3ppm above 30MHz. The optional TV-R7100 TV/FM adapter allows you to receive TV broadcasts (when connected to a CRT monitor) and listen to stereo FM broadcasts. SSB (USB, LSB), CW, AM, FM and WFM are included and several speciality modes, CW narrow, AM wide, AM narrow and FM narrow are available to receive a variety of signals that require a matched passband width. The IC-R85000's all mode capability allows you to receive signals in many different modes from the world over. Radio signals are transmitted in a variety of modes. The programmable tuning step can be set (independently for each memory channel) to a value between 0.5 ~ 199.5Khz in 0.5kHz steps. In addition, a programmable tuning step is available. Numerous tuning steps are available for operating a wide variety of stations. Use the method that best suites the situation.

Two methods of frequency entry are available using the tuning dial or direct frequency entry from the keypad. You can be sure that if there are any communications or broadcasts out there, you'll be able to hear them with minimum interference from other signals. The IC-R8500 covers a wide frequency range continuously from 0.1 to 2000MHz, with 10Hz resolution, while maintaining a high receive sensitivity. The Icom IC-R8500 is going to be another powerhouse of a receiver and we have just received our first deliveries although supplies will no doubt be limited initially !

Icom ic r8500