http://elecraft.85.s1.nabble.com/What-s-best-Soundcard-Interface-for-KX3-tp7616157p7616173.html
JT65/9. FLDigi, MixW, or WSJT/x wouldn't know what to do with an IQ output.
> On the topic of sound cards, I was wondering what the advantages are to
> using the IQ output of the KX3 as opposed to feeding the headphone jack
> into the input of the soundcard? I believe the IQ output requires
> stereo input to work, but what are the advantages? I have seen on this
> list quite a few people with radios that have an IQ output still use the
> headphone output to decode the digital modes. I am under the impression
> that the PX3 can display a 200KHz slice of the RF spectrum using the IQ
> outputs whereas the best I can get out of fldigi is about 4KHz. Is
> there any way to coerce fldigi to display a wider chunk of the band? I
> am running fldigi on Linux.
>
>
> John
> KD8CIV
>
> On Sun, 2016-04-10 at 14:56 -0400, Don Wilhelm wrote:
>
>> George,
>>
>> You laptop may have only a mono input for the mic/line-in, but for
>> digital modes, only one channel is used, so it should work - just be
>> sure to turn off sounds from your OS so those are not transmitted on the
>> air.
>>
>> A simple and inexpensive USB soundcard can eliminate the problem of
>> sounds from the OS. Just make certain the USB soundcard is *not* the
>> default sound device.
>>
>> For digital modes, you do not need an expensive interface. Yes, some
>> provide ready made cables to connect with your radio, some have galvanic
>> isolation on the audio lines, and some provide PTT to the transceiver,
>> but VOX works just great with the KX3 for digital modes (you don't need
>> PTT).
>>
>> The big difference between soundcards (including those built into
>> interface boxes) for digital modes is the noise floor of the soundcard.
>> You mentioned Signalink, and while popular, it is not the best interface
>> available.
>>
>> Try your laptop internal soundcard before buying anything else, it may
>> be all you need.
>>
>> 73,
>> Don W3FPR
>>
>> On 4/10/2016 2:09 PM, George_yv5wz wrote:
>>> Thank you Don!
>>>
>>> So you mean I don't need to buy anything just my laptop....that's
>>> interesting!
>>>
>>> however, I'm kind of confuse....why so many brands of expensive interface
>>> sound card....does it represent any better signal or any using interface
>>> ?....I mean 100 Box (signlink) against simple USB soundcard (12 box)
>>> .....does it really matter?
>>>
>>>
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