[Elecraft] Performance of internal USB sound system compared to external one?

[Ken Arck]

Hi Jeff

Doing a side-by-side is easy as I explained in my 
original post. I can absolutely (and empirically) 
show that the FCD+/Linrad/MAP65 combo decodes 
JT65B much more reliably than does the K3S/DEMI 
xvtr/USB CODECWSJT10 combination as currently 
configured.  Whereas the TS2K/computer soundcard 
(Realtek AC 97 based)/WSJT10 combo decodes JT65B 
more reliably than the K3s combo. I haven't done 
a TS2K and K3s combo side-by-side as I don't have the hardware to do so.

I was thinking about trying the In/Out 
connections (via the RigBlaster) on the K3s to 
see if the CODEC is the issue but I was wondering 
if someone had already been down this road. Hence my question

Ken



At 12:02 PM 6/14/2016, Jeff Stai wrote:
>The built-in sound card in the K3S works just 
>fine for RTTY decode - MMTTY and 2Tone - but 
>RTTY doesn't require high performance from a 
>sound card. For more demanding modes I can't 
>comment, but I would definitely expect the K3s 
>to meet or exceed the specs of the Rigblaster, 
>which is nothing special. Ken, I would look into 
>your setup in detail. If you can contrive to do 
>a real time side by side test where you can 
>observe both decodes at the same time that would 
>give you confidence that there is really something wrong, or not.Â
>
>73 jeff wk6i
>
>
>On Tue, Jun 14, 2016 at 11:50 AM, Robert Wood 
><<mailto:woodr90 at gmail.com>woodr90 at gmail.com> wrote:
>also curious if anyone has used the USB audio into MMTTY or 2Tone for
>decoding RTTY and your report ?
>73 Robert W5AJ
>
>
>-----Original Message-----
>From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ken
>Arck
>Sent: Sunday, June 12, 2016 8:27 PM
>To: <mailto:elecraft at mailman.qth.net>elecraft at mailman.qth.net
>Subject: [Elecraft] Performance of internal USB sound system compared to
>external one?
>
>Admittedly, I am a new owner of the K3s and am still learning my way around
>it. I bought it mainly for use an IF radio for my DEMI 2 mtr xvtr, which I
>use for EME work. It came highly recommended as one.
>Prior to the K3s, my EME workhorse radio was a Kenwood TS2K which actually
>worked "fine" but as most are. I am always looking to improve my station. I
>used a RigBlaster as the sound card interface with the computer used.
>
>I am using the USB port for everything - audio in/out, PTT, CAT control,
>etc. along with some VSP software. I also run a splitter on the RX line from
>the EME array with one side going to the DEMI xvtr and the other to a
>FuncubePro+ dongle. The K3s feeds WJST and the
>FCD+ feed MAP65, running side-by-side.
>
>Trying NOT to drag this out too much longer, it seems to me the K3s/DEMI
>setup simply doesn't decode as well as the TS2K did (does?) and I'm
>wondering if anyone has real world experience in comparing how well the USB
>audio method versus the IN/OUT and the Rigblaster interface to the
>computer's soundcard. The FCD+ decodes MUCH better than the K3s/DEMI setup
>as I currently have it whereas the TS2K seemed to be better on the weaker
>signals.
>
>Maybe I just don't have something setup correctly.....
>
>TIA
>
>Ken
>
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>--
>Jeff Stai ~ <mailto:wk6i.jeff at gmail.com>wk6i.jeff at gmail.com
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------------------------------------------------------------------------------
President and CTO - Arcom Communications
Makers of repeater controllers and accessories.
http://www.arcomcontrollers.com/
Authorized Dealers for Kenwood and Telewave and
we offer complete repeater packages!
AH6LE/R - IRLP Node 3000
http://www.irlp.net
"We don't just make 'em. We use 'em!"