Hey Folks,
I'm trying to determine whether an oddity I'm experiencing with the
DSP filter is unique to my K3, or might be a general firmware bug.
I'm using the beta 3.19 firmware, but have not tried it on earlier
versions to see if it's unique to 3.19.
I have the 13 kHz, 2.7 kHz, and 400 Hz filters installed.
1. Go to a clear spot on any band (i.e. no signals, just noise). CW
mode.
2. Set the "SHIFT" control to the minimum value (FC 0.15 on my rig).
3. Set the "WIDTH" control to BW 1.20. Note the sound of the noise.
4. Rotate the "WIDTH" control CCW. At BW 1.00, there's a drastic
change in the noise. The low frequencies disappear.
5. Continue rotating "WIDTH" CCW. At BW 0.85, the low frequencies re-
appear and remain present through the minimum width (BW 0.05)
Here are (very rough) readings I took of the -6 dB points with
Spectrogram:
BW f lo f hi
1.20 145 689
1.10 183 695
1.00 360 586
0.95 358 574
0.90 365 574
0.85 166 501
0.80 168 490
0.75 181 480
The shift on the low frequency end by nearly an octave between 1.0 and
0.90 is clearly visible. Note that throughout these readings, the
XFIL display indicated FL2 (my 2.7 kHz) filter was being used.
If anyone else can reproduce this, please let me know.
73
--
Joe KB8AP
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