Grant,
It would appear that you are running up against the bandwidth limit of the
KX3 audio when you widen the bandwidth with HiCut.
I don't know what the limits are, but from your observations, it may be
that the maximum bandwidth is in the vicinity of 6.4kHz.
So if you have 4.2 kHz on one side, you will be restricted to 2.2kHz on
the low side.
If you back off the high side to 3.1kHz, is the AM response centered?
I am just venturing a guess, the maximum audio bandwidth is not
specified for the KX3.
73,
W3FPR
On 5/3/2016 8:46 PM, GRANT YOUNGMAN wrote:
I posted this a week or so ago, and didn’t get any feedback from Elecraft or
anyone on the list. Soo .. I’m going to “bump” it and post again. You never
know …
In further poking at it, it matters not whether the IF shift is set to 8 Khz on
the KX3, or whether Hi/Low Cut or PB/Shift is selected etc. It appears to be
PX3 related. My guess is that either it’s (1) some artifact of the direct
conversion process on the KX3, or (2) perhaps just showing AF bandwidth in some
odd way. In any case … here’s the original post. Anyone have a clue?
"If the bandwidth/shift or Hi/Lo cut is NORMalized, the green bandwidth band on
the PX3 sits with it’s edges about 3 KHZ above and 3 KHz below the carrier frequency
as you might expect. It’s symmetrical around the carrier. If I open up the HI
setting to max (4.2 KHz) and set the LO to minimum, the green band is offset to the
high frequency side of the carrier — with the low boundary about 2.2 KHz below the
carrier, and the high boundary about 4.4 KHz above the carrier. These points may
not be exact, but they were roughly measured using the VFO A marker — close enough
to make the point. And just using the usual reduction in background hiss to retune
the carrier, it appears most closely tuned when the VFO is set about 0.9 KHZ above
the actual carrier frequency, although even then the green band is offset from
either the actual or tuned carrier freq.
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