Jim,
It is important to realize that the K3 bandwith is equal to the audio
bandwidth. The K3 reports the audio bandwidth.
A K3 with a 6 kHz filter is limited to a maximum of 3 kHz audio because
an AM signal is double sideband and the IF bandwidth for the AM signal
must be twice the audio freq
OK, I think I read something into Joe's post that wasn't really there,
that's how I thought it worked and I I think Joe was referring to the
DSB BW at the 15 kHz 2nd IF. Enjoy the GC, we stayed in a cabin maybe
50 meters from the edge ... awesome!
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Wash
Joe, I think the confusion might come in with the typo -> A 5 KHz *audio*
bandwidth would be equivalent to a 10 Hz RF (IF)
Should be -> A 5 KHz *audio* bandwidth would be equivalent to a 10 KHz RF (IF)
73,
Bill WE5P
>
> On Dec 13, 2019 at 15:31, Joe Subich,
> On Dec 13, 2019, at 12:30 PM, Joe Subich, W4TV wrote:
>
> A 5 KHz *audio* bandwidth would be equivalent to a 10 Hz RF (IF)
> bandwidth.
I expect you mean a 10 kHz RF bandwidth, not 10 Hz.
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
___
Fred,
The audio CODECs in the K3 have a 12 kHz sample rate. This puts the maximum
audio bandwidth at 6 kHz. Practical limits of DSP filtering in the context of
the K3 implementation limit audio to 4.5 kHz or so.
Aliasing around the 12 kHz sample rate of the CODECs required that “brick wall”
On 2019-12-13 1:22 PM, Fred Jensen wrote:
> Could you explain a little more?
What's to explain? AM is a double sideband signal - equal width
either side of the carrier with each sideband carrying the same
audio information but inverted in frequency.
A 5 KHz *audio* bandwidth would be equivalent
Could you explain a little more?
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 12/13/2019 6:19 AM, Joe Subich, W4TV wrote:
Remember, the DSP display is audio. 5 KHz represents 10 Hz at
RF (IF).
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On 2019-12-13 8:58 AM, Jim Stoneback via Elecraft wrote:
Is there any way to expand the (receive) DSP maximum bandwidth beyond 5kHz in AM mode?
No. It would be ineffective since the audio chain has a
4500 Hz "brickwall" (sharp cutoff) lowpass filter limiting
the audio response (to remove DA
Is there any way to expand the (receive) DSP maximum bandwidth beyond 5kHz in
AM mode? I have the 13 kHz roofing filter installed.
73,
Jim K4AXF
K3 #4936
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