Thanks, Wayne. The effectiveness of the K4 NB will be a major factor for
me.
FWIW, I have found the K3 NB to be vital in my locality and have
depended on it a lot (for hundreds of CW QSOs in the recent SKCC event),
its major fault being key "clicks" from adjacent CW signals leaking
through when NB is engaged. I'm wondering how well the K4 handles nearby
signals when the NB is on, compared to the K3.
Also, I'm wondering how well the K4 NB might handle real key clicks
produced by mis-adjusted transmitters, of which there seem to be many
these days.
73,
Drew
AF2Z
On 02/22/21 16:14, Wayne Burdick wrote:
A brief K4 audio sample can be downloaded using the link at the end of this
email.
This recording hows how the new K4 noise blanker algorithm can reveal a signal
buried under loud noise. It also highlights the effectiveness of the
audio-peaking filter (APF) when listening to a very weak CW signal.
This was recorded on 17 meters, CW mode, in a 1 kHz bandwidth. Both receivers are
turned on, tuned to the same frequency, and the recording is stereo. There's a
slight delay between main and sub RX audio as the settings change; this is due to
tapping A>B to copy the main RX NB and APF settings to the sub RX.
Things to listen for (T in seconds):
T0: S-9 noise masking very weak carrier
T7: Noise blanker turned on so that only atmospheric noise remains; carrier
now barely audible
T14: APF turned on, 30 Hz BW; carrier clearly audible
T23: Carrier disappears, leaving band noise only
http://ftp.elecraft.com/K4/K4_audio_samples/K4%20NB%20demo%201.mp3
73,
Wayne
N6KR
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