[Elecraft] odds and ends...

[Joe Subich, W4TV]

> 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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