[Elecraft] K4 model v. K3S for strong nearby signal rejection.

[ebasilier at cox.net]

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: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of Joe Subich, W4TV
Sent: Friday, November 01, 2019 12:34 PM
To: elecraft at mailman.qth.net
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:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html Message
delivered to ebasilier at cox.net