Amy,
Try using a different USB cable. What you describe sounds like
an open shield on an inexpensive cable.
73,
... Joe, W4TV
On 2015-06-23 10:00 PM, Amy Wilhelm wrote:
Yeah, that’s where I am now. The Air, conveniently, doesn’t have a mic jack,
but I do have a lovely interface I certainly think is good quality I picked up
a while ago for music production.
Thanks all.
-Amy
On Jun 23, 2015, at 6:53 PM, Fred Jensen <[email protected]> wrote:
Amy,
Why don't you try 2 stereo cables between your laptop and KX3, all audio. I'd
suggest Radio Shack except RS es mort. Others have suggested ditching the SL,
it isn't much of a sound card and does have some RFI problems, so start simple.
You can decide about the SL later.
Two RS stereo cables have been my digi interface, always has, works great,
lasts a long time. It's probably not the absolute best, but it works.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org
On 6/23/2015 6:36 PM, Amy Wilhelm wrote:
Having performed further science, here’s what I’ve got:
1. When the Signalink is connected to my laptop but not the KX3, nothing
special.
2. When the Signalink is connected to my KX3 (mic jack so I could monitor the
receive audio), broadband noise.
2a. in this instance, noise is quieted by placing my hand on or near the
Signalink.
3. When the Signalink is connected to my laptop but not the KX3 *and* the
KX3USB is connected to my KX3, broadband noise.
3a. in this instance, noise is louder when I put my hand on or near the
Signalink.
4. When the Signalink is connected to my laptop and the KX3 and the KX3USB
cable is connected to my KX3, a very small amount of (equally broadband) noise.
This seems distinctly ungood if a little messing with capacitance causes that.
All of these seem to be radiated either by the Signalink itself or by a cable
connected to it - ‘course, that could include the USB cables and the laptop as
well. Whenever I turned the null on my antenna towards their general direction,
the noise got quieter (but was still strong enough to be bothersome).
Gonna try those mods as soon as my order from Mouser gets here. Crossing my
fingers it’s by Field Day.
73
Amy
K3ISI
On Jun 23, 2015, at 5:45 PM, Amy Wilhelm <[email protected]> wrote:
Yeah, fldigi doesn't seem to know what to do with I/Q. Yet.
CAT control isn't strictly necessary. But it's nice to have with fldigi, WSJT,
and various logging software.
73
Amy
K3ISI (granted today)
Sent from infinite squirrels at infinite keyboards
On Jun 23, 2015, at 5:18 PM, [email protected] wrote:
Guys,
Two things. First, you can't use the I&Q data on the KX3 to transmit and I'm
not really sure you can use it with FLDIGI; I believe FLDIGI only expects audio.
And second, I'm not sure why you need to use ACC1. The only connections you should
need to use is to the KX3 mic and the USB connector for the SignaLink. The
SignaLink will key the radio with out needing other connections. This may help some
of the noise problem.
73,
Barry
K3NDM
----- Original Message -----
From: "bs usb" <[email protected]>
To: "elecraft" <[email protected]>
Sent: Tuesday, June 23, 2015 5:01:45 PM
Subject: Re: [Elecraft] KX3 + SignaLink USB noise problems
With the I/Q output from the KX3 and fldigi software on the Mac why do
you even fool with signal-link?
Amy Wilhelm wrote:
Yes, it's another post about that little interface we all love to hate...
I went through archives and didn't find anything that *quite* matched
this, so I wanted to know if anyone's experienced it or has tips.
Aside from the widely reported high noise floor (it *seems* to be
possible to just crank the RX volume to get past that a little) I have
a couple of symptoms that are...strange at best:
1. If I have the KX3 connected to my laptop via the KX3USB cable to
ACC1, and then attach the Signalink to a different USB port, I
immediately experience broadband noise. Changing the IF doesn't seem
to help this, and I seem to be tuning past peaks of noise all across
the band. If I detach the Signalink, most of these symptoms go away (I
think some of the peaks are just out there).
2. The Signalink seems to be radiating a significant amount of QRM -
or the cables connected to it (but not necessarily to the KX3) are.
Because I use an Alexloop, my antenna is always right next to my
laptop, interface, radio, all that fun noisy stuff. Conveniently
magloops have this great null directly perpendicular, so I've worked
out that turning my antenna perpendicular to the Signalink - not
necessarily my laptop or radio - reduces the noise floor significantly
(both wideband noise and weird little blips every 150 Hz or so). I'm
not actually sure at the moment whether I've checked if unplugging my
Signalink makes a big difference, but evidence would suggest I should
try that.
This is all with the KX3 operating off of a gel cell (so no QRM
there), the Signalink with the official KX3 snap-in jumper board and
cables, a Macbook Air running from its internal battery, an Alexloop,
and the included KX3USB cable.
Any help would be much appreciated - I've seen the page suggesting
some mods to the Signalink and I'm more than willing to do those if
those would help with the symptoms I've been seeing here, but wanted
to check if anyone thought that was reasonable (and that my diagnosis
is) first.
73
Amy Wilhelm
WN5FIZ
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