[Elecraft] K2 S/N 3105 on the air -- crystal filter curves

[Dave]

Thomas

How do you find the performance of the 100 Hz filter settings? From your
figures there seems to be significant additional loss on the narrower
setting. From my own experiments, 400 Hz and 700 Hz bandwidth seems fine,
but narrower settings seem "difficult" with off centre results and
additional loss. This was the case before and after the crystal case
grounding modification.

Any thoughts?

Dave, G4AON
K2 #1892

----- Original Message -----
From: "Thomas Martin" <df7tv@arrl.net>
To: <elecraft@mailman.qth.net>
Sent: Sunday, January 12, 2003 12:08 PM
Subject: [Elecraft] K2 S/N 3105 on the air -- crystal filter curves


> Hello,
> just wanted to thank the list and elecraft support for the help during
> assembly of K2 S/N 3105 (Rev. B).
> It is on the air since January 6, 2003 now and about 50 successfull QSOs
> have been made.
>
> For those interested in I recorded the CW crystal filter curves for the
> default bandwidth settings using Spectrogram 7.2. K2's AGC and PREAMP have
> been off during the measurement and I used Tom Hammond's (N0SS) noise
> source.
> The frequency marker is set at 607Hz which corresponds to the measured
> sidetone pitch for the setting "ST_P=0.60" at this K2. A 170kB ZIP-file
> containing 8 JPEG-pictures (CW normal/reverse | 1500/700/400/100Hz) may be
> downloaded here:
>
> http://www.qsl.net/df7tv/download/xfil3105.zip