[Elecraft] K2 CW Filter Characteristics

[George, W5YR]

----- Original Message -----
From: "Bill Tippett" <btippett@alum.mit.edu>
To: <elecraft@mailman.qth.net>
Sent: Tuesday, July 01, 2003 5:04 PM
Subject: Fwd: Re: [Elecraft] K2 CW Filter Characteristics


> Thanks guys (including W5YR off-list)!

> W5YR sent me several plots that appear to be Spectragrams,
> but George's plots appear to be dynamic range limited (probably
> due to ADC DR in his soundcard) and appear to include other
> effects such as NB, AF, etc.

Bill, I believe that those were done with SpectroGram and are of limited
dynamic range. I have since started using SpectraPRO and have a different
non-soundcard ADC unit so the dynamic range is now about 60 dB on my
spectral estimates.

I included the NB and the audio filter spectra at the request of a friend. I
am not equipped to make the spectral estimate that you want directly at
4.915 MHz. Perhaps someone with a good spectrum analyzer can step forth and
do the job.

Having said all that, my thought is that the IF filters in the K2 perform
about like those spectra predict. I have found them to be adequate but
without the audio filter, the CW selectivity leaves a lot to be desired when
the going gets tough.

But, I can toss the K2 and the rest of the "station" in the shiny box from
Lowe's and take it anywhere - can't do that with the PRO2!

73/72, George
Amateur Radio W5YR -  the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"In the 57th year and it just keeps getting better!"
<mailto:w5yr@att.net>