The response on FM is from 400Hz-2700Hz, just measured it with my spec. It is
also DSP limited.
I think there is room for improvements.
73
Michael
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One of the reasons I bought the 13-KHz filter was to process wide
band audio baseband for use by spectrum sw, but it appears the
modes limit this if I understand correctly. Example in FL1
(13-KHz) I am only able to reach 4-KHz in USB. Same goes for DATA-A
max bw is 4-KHz. AM - 5 KHz, FM
Edward R. Cole wrote:
One of the reasons I bought the 13-KHz filter was to process wide
band audio baseband for use by spectrum sw, but it appears the
modes limit this if I understand correctly.
What limits it is a 4Khz low pass filter that all the audio passes through,
independent of
What limits it is a 4Khz low pass filter that all the audio passes
through, independent of mode.
The limit is in the audio DSP - you will see the maximum cutoff even
on the Line Out which does not pass through the analog (op amp) LPF
in the headphone/speaker channel.
73,
... Joe, W4TV
I have the KFL3A-6K 6 kHz AM/ESSB, 8-pole filter installed and working.
In AM mode, I tap XFIL and VFO B display says FL2 6.00
I hold SHIFT in and see --NOR--
I tap WIDTH and see BW 3.00 -or- HI 3.00
I tap SHIFT and see *FC 1.50 -or- LO 0.00
when I turn WIDTH clockwise to it's maximum, I see
Sam,
Nothing inconsistent as long as you understand what is being displayed.
The display is showing you the audio bandwidth, not the IF bandwidth.
An AM signal has two sidebands extending on either side of the carrier,
and if the width of an AM signal is 6 kHz, it would demodulate to a
With the 6 kHz filter, if you want to hear substantially greater than
3 kHz audio, you can use synchronous AM, or you can install the 13
kHz filter and increase the width control to 5 kHz (the maximum).
No matter what (roofing) filter you use, the K3 will not reproduce more
than 4.5 KHz
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