John,
The easiest way to eliminate RFI as the culprit is to transmit with either your
power level at zero or into a well-matched dummy load with a short, shielded
cable (or both at the same time).
If the problem happens with no RF out, you're correct that it's not RFI.
The next step is to eliminate CAT control - run without CAT and use RS-232 PTT.
If you still suspect WSJT-X, try running PSK31 or another digital mode. If that
works and WSJT-X doesn't, you're right again.
My bet (if not RFI) would be a crappy Vista driver. I've had the exact same
symptoms, and it was RF. Judicious application of split toroids on every wire
within reach fixed my issue.
--
David Tiller
Sr. Architect/Lead Consultant | CapTech
(804) 304-0638 |
dtil...@captechconsulting.com<mailto:dtil...@captechconsulting.com>
On Jun 6, 2018, at 4:48 PM, John C. Westmoreland, P.E.
<j...@westmorelandengineering.com<mailto:j...@westmorelandengineering.com>>
wrote:
Jim,
OK - so the claim I'm reading here is Hamlib is 1000% bug-free regarding
Vista-64? I'm very skeptical about that; the most obvious issue and nothing
mentioned thus
far obviates this.
I'm looking into the obvious first. If my rig was so poorly configured; how in
the world did I make a contact with Argentina?
And, I've made a lot of other contacts. Including Virginia, North Carolina,
New York, and North Dakota not to mention Japan. And Arizona, and California,
and
Oregon, and Washington...
Since the thread running WSJT-X can't be killed; I'm looking into that first;
and the cause of that.
The next obvious step for me is to make builds myself and look into the source
code.
73's,
John
AJ6BC
On Wed, Jun 6, 2018 at 12:59 PM, Jim Brown
<k...@audiosystemsgroup.com<mailto:k...@audiosystemsgroup.com>> wrote:
On 6/6/2018 12:36 PM, John C. Westmoreland, P.E. wrote:
That's an interesting hypothesis. Since USB is differential signaling - it has
some noise immunity; but I will definitely check into this.
Hum/buzz gets into our systems as a result of failure to implement proper
bonding between interconnected equipment, combined with improper termination of
shields within equipment by their designers. Study my tutorial on this, which
goes through both circuit analysis of the problem and details good engineering
practice.
http://k9yc.com/GroundingAndAudio.pdf
Or study N0AX's new ARRL book on the topic, which was inspired by my tutorial,
and to which I made many contributions.
73, Jim K9YC
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