[Elecraft] odds and ends...

[WB4JFI]

Mr Nyquist would be happily surprised at that.  With I&Q samples at 48kS/s each, you get a maximum of 48kHz, or one-half the total bandwidth.  Not 48k+48k.

So, with a 48k sample rate, you will get plus and minus 24k from center.

Sent from tfox iPad

On Aug 19, 2012, at 4:33 PM, "Joe Subich, W4TV" <lists at subich.com> wrote:

> 
>> The sound card's maximum sampling rate will determine how wide your
>> panadapter display can be (in kHz); for example, a sound card capable
>> of sampling at 48 kHz can display slightly less than 48 kHz of
>> spectrum. If you want a wider display, you will have to ensure that
>> your sound card can sample at higher rates.
> 
> A sound card capable of 48 KHz sample rate can display slightly less
> than 96 KHz.  With I/Q inputs and 48 KHz sampling you get +/- 48 KHz.
> 
> 73,
> 
>    ... Joe, W4TV
> 
> On 8/19/2012 4:20 PM, Richard Ferch wrote:
>> Jeff,
>> 
>> In addition to the cable, you will also need to be sure that your
>> laptop's sound card accepts stereo input. Panadapter software requires
>> stereo input (I and Q channels). Some laptop input jacks will only
>> accept mono signals, even though the laptop's sound card itself is
>> stereo. My newest laptop, for example, has a TRRS jack for the sound
>> card with a single input line, two stereo output lines, and ground.
>> I have no way to get stereo input into this sound card. An older laptop
>> I have has separate input and output jacks, but while the output jack is
>> stereo, the input jack is mono. If your laptop is like either of these,
>> your only recourse may be to get an external USB sound card with stereo
>> inputs.
>> 
>> The sound card's maximum sampling rate will determine how wide your
>> panadapter display can be (in kHz); for example, a sound card capable of
>> sampling at 48 kHz can display slightly less than 48 kHz of spectrum. If
>> you want a wider display, you will have to ensure that your sound card
>> can sample at higher rates.
>> 
>> Note that if you need to use an external (e.g. USB) sound card, it may
>> or may not have 3.5mm inputs. For example, I have one with dual RCA
>> phono jacks for its line inputs. With one of these cards, you would need
>> to go from 2.5mm stereo for the KX3's RX I/Q jack to two separate RCA
>> phono plugs for the sound card's input.
>> 
>> I don't know whether Radio Shack has the specific cable you would need,
>> but I am sure that they have cables and adapters that could be combined
>> to achieve the desired result.
>> 
>> 73,
>> Rich VE3KI
>> 
>> 
>> WW6L wrote:
>> 
>>> Per the manual Iit looks like I would need one of these
>>> 
>>> A cable with a 2.5 mm (3/32") plug on one end and
>>> a plug that matches your sound card input on the
>>> other end (typically 3.5 mm [1/8"] stereo) is
>>> required.
>>> 
>>> If I want to see a panadapter display on my laptop.
>>> 
>>> Where do I get it?
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