I was hoping to get a hint from the manual as well as answer a few other
questions, But it isn't on line yet.
The I&Q data coming out of the KX3 is analog. It could be that they are,
in fact, feeding an A/D converter directly. The rest would be just some
software and a look up table. I guess I agree with you that would be the
way to go. It's straight forward.
73,
Barry
K3NDM
On 4/5/2014 7:35 PM, Walter Underwood wrote:
I bet they digitize it as early as possible, then use an FIR filter to reshape
it. Or scale the values after they FFT, since that is already in the frequency
domain. The scale values would be a vector of constants, so it would be really
fast and wouldn't even add delay (the bane of FIR filters).
wunder
K6WRU
On Apr 5, 2014, at 6:26 PM, Barry LaZar <[email protected]> wrote:
Yep. That what I was questioning. I, too, remembered those words. I also know
it will take more than just inserting an amplifier with inverse gain
characteristics. I know it can be done. However, that doesn't sate my curiosity
as to how they did it. I just hope the solution isn't proprietary.
73,
Barry
K3NDM
On 4/5/2014 7:14 PM, Walter Underwood wrote:
Yes. I posted the text from the manual two days ago in the KX3 list.
"The RX I/Q outputs from a receiver are not “flat” over an infinite frequency range;
the signal-conversion process results in some slope (decrease in gain) as you move
farther from the center frequency. In the case of the KX3, the signal will be reduced by
about 2.5 dB at +/- 24 kHz, 4 dB at +/- 48 kHz, and 7 dB at +/- 96 kHz. The spectrum
amplitude on the display, including the apparent noise floor of the receiver, will “roll
off” by these amounts." (page 26)
I would not be surprised if they corrected for this in the PX3.
wunder
K6WRU
On Apr 5, 2014, at 1:55 PM, Barry LaZar <[email protected]> wrote:
Good question. I have run at 192 KHz. with the sound card I have, a Steinberg
UR22. The display I see using NaP3 shows a non-flat response. In fact, there
are some words about this in the KX3 manual.
73,
Barry
K3NDM
On 4/5/2014 1:07 PM, Uwe Hermanns wrote:
Hi,
is the frequency responce of the KX3-IQ really flat over 250 kHz?
73 de Uwe, DL4AC
---------- Weitergeleitete Nachricht ----------
Von: "Allen Patterson" <[email protected]>
Datum: 05.04.2014 19:03
Betreff: [Elecraft] PX3
An: "[email protected]" <[email protected]>
Cc:
When is the PX3 going to be available for shipping?
You mentioned several software-firmware updates for the PX3 that are
planned.
What is the general schedule for each of these updates after initial
product shipment?
When is the manual for the PX3 going to be available?
73
Allen Patterson, KC7SYR
[email protected]
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