I believe that using a roofing filter that is about as narrow as the overall receive bandwidth can have a detrimental effect on ssb voice quality as well as on digital mode reception. Will the K4HD have a single button way to remove the superhet part so that receive quality can be easily compared without change of overall bandwidth and volume?
73, Erik K7TV -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Joe Subich, W4TV Sent: Friday, November 01, 2019 12:34 PM To: [email protected] Subject: Re: [Elecraft] K4 model v. K3S for strong nearby signal rejection. On 2019-11-01 11:56 AM, Bill W4ZV wrote: > Thanks Joe! From those BWs I assume both are 5-poles. I can't recall seeing any comment of 5 pole vs 6 pole vs 8 pole. Wayne did say that any of the K3/K3s filters would work (and I assume, be available as options). I don't see any value in "narrow" versions of the standard bandwidths as the ADC being used in the K4 will have several dB of dynamic range above and beyond that of the K3/K3S. As a SWAG - if there are indeed three slots - I would consider 6 KHz - data modes (JT65/FT8/FT4/etc.), AM and ESSB, 2.8 KHz - SSB and general purpose RTTY, and 500 Hz - CW and high performance RTTY. 73, ... Joe, W4TV ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
