I can remember very loud stations 10 or 15 KHz away completely desensing my receiver to the point that the station I was trying to copy simply disappeared. When I switched to the K3 the difference was astounding.
That is because the 756Pro is a completely brain dead design ... there is only a single 30 KHz or so roofing filter at VHF and AGC which is based on total signal in that 30 KHz or so "window" starts at a very low level. The only job of the K3's *hardware AGC* is to protect the analog to digital converter from being driven into saturation so it does not begin to activate until approximately S9+40. The K3's normal AGC is entirely DSP based and is effectively controlled by only the signal which passes through the DSP (it is a shame the AGC control point isn't also after the notch <G>). 73, ... Joe, W4TV On 5/11/2014 10:02 PM, David Gilbert wrote:
I completely agree with all of that except for the very last sentence. Clearly you've never used a 756Pro (first version) in a major CW contest. I can remember very loud stations 10 or 15 KHz away completely desensing my receiver to the point that the station I was trying to copy simply disappeared. When I switched to the K3 the difference was astounding. 73, Dave AB7E
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