Re: [Elecraft] K3 SSB Contour Filter (reduce total bandwidth)

Lyle, on receive it's possible to demonstrate some of the benefit of a voice contouring filter simply by setting the 800 Hz RX EQ to -16 dB and the manual notch to 1100 or 1200 Hz. Audio engineers have made use of a 1000 - 1200 Hz notch for many years to make band limited audio sound

Re: [Elecraft] K3 SSB Contour Filter (reduce total bandwidth)

Tony, I have not had time to give it a good test. The noise reduction of the narrower bandwidth is not significant but annoyance of the band noise in the gap is eliminated. It is debatable whether the built in NR is better. I think filter settings need to be set up with

RE: [Elecraft] K3 SSB Contour Filter (reduce total bandwidth)

Tony Fegan VE3QF wrote: I am quite aware that the gurus at Elecraft are extremely busy and need evidence that firmware changes are beneficial. That is why I asked that those with the KRX3 should try my method and report their findings. The K3 has a great CW receiver but SSB

RE: [Elecraft] K3 SSB Contour Filter (reduce total bandwidth)

In contests and especially 160m SSB there are several stations on top of each other. Assuming that the majority of power is within a few hundred Hz, the notch in the middle possibly can reduce interference from stations 500-1000 Hz away. Ignacy -- View this message in context:

Re: [Elecraft] K3 SSB Contour Filter (reduce total bandwidth)

I am quite aware that the gurus at Elecraft are extremely busy and need evidence that firmware changes are beneficial. That is why I asked that those with the KRX3 should try my method and report their findings. The K3 has a great CW receiver but SSB improvements seem to be on the back

Re: [Elecraft] K3 SSB Contour Filter (reduce total bandwidth)

Hi Lyle, Thanks for your comments. Yes with NBVM, at the transmitter end, voice frequencies above 1500 Hz were folded back (sideband reversal) into the gap . The process was reversed in the receiver. As far as I remember, Tom VE2AGF told me they even found it unnecessary to null out the

Re: [Elecraft] K3 SSB Contour Filter (reduce total bandwidth)

Didn't they use something like this in the space programs? David G3UNA K3 SSB Contour Filter Recently I was reminiscing about Narrow Band Voice Modulation which was developed in the late 1970s by Tom Lott VE2AGF and R.W.Harris, WB6CZX. An important part of this system relies on the fact

RE: [Elecraft] K3 SSB Contour Filter (reduce total bandwidth)

Hi Gary, Thanks for your interest. I am quite aware that the gurus at Elecraft are extremely busy and need evidence that firmware changes are beneficial. That is why I asked that those with the KRX3 should try my method and report their findings. This method is only good for evaluation but