![]() By moving the DSP to the IF level, Yaesu is able to largely avoids this. With AF based active filters, out of passband signals would still create AGC pumping. The DSP works at the IF level which means the AGC loop is part of the system. The DSP filtering in the FT-2000 is a huge step beyond the old active filter technology for several reasons. That interest remained with me - and to this date, I continue to be interested in how filters of all types can affect the sound of a rig and increase the operators enjoyment. With an op amp, a few caps and a few resistors, selectivity could be had on the cheap. As a young ham without money for new rigs or even crystal filters for the old ones, I was drawn to the magic of active filters. The first time I used the APF, I thought how it reminded me of an active filter. It brings a "peaky" characteristic to the sound of the rig and makes CW operation a real joy. The APF is engaged in CW, by pressing on the CONT button and holding in for a couple of seconds. One of my favorite features of the FT-2000 is the APF. Old School Active Filter Sound for the FT-2000 What's Behind APF? Vedi questa pagina in Italiano (IW1AWH PDF) ![]()
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