The symptoms suggest to me RF getting into a USB cable between computer and the
rig’s CI-V USB port. My cousin had a similar situation with his FTDX-3000 on
40 and 30M FT8, where the rig would abruptly quit transmitting if he tried to
exceed about 25 watts. The problem was solved by winding some of the “spare”
length of the computer to CAT USB cable on a ferrite toroid (FT240-43 used in
this case). He can now increase to full output power of the rig (100W) without
anything “flinching.” Just a thought. 73,
Jim, W7XZ
From: Christopher Diederich via wsjt-devel
Sent: Wednesday, November 20, 2019 05:01
To: Paul Randall ; WSJT software development ;
wsjt-devel-ow...@lists.sourceforge.net
Cc: Christopher Diederich
Subject: Re: [wsjt-devel] Fwd: 40 Meter Power USB-D issue
I will run it into a dummy load to check though. Thanks for the suggestion.
Chris
Get Outlook for iOS
On Wed, Nov 20, 2019 at 7:53 AM -0500, "Christopher Diederich"
<k1...@yahoo.com> wrote:
I have not tested with a dummy load. Other digital modes and phone don’t
have the same issue, and SWR is 2.5:1 into OCF 80 meter dipole, which is tuned
easily with my LDG.
Get Outlook for iOS
On Wed, Nov 20, 2019 at 5:12 AM -0500, "Paul Randall"
<paulfrand...@hotmail.com> wrote:
Does it do it when the rig is running into a dummy load?
Sent from my Samsung Galaxy smartphone.
-------- Original message --------
From: Christopher Diederich via wsjt-devel
<wsjt-devel@lists.sourceforge.net>
Date: 20/11/2019 01:59 (GMT+00:00)
To: wsjt-devel@lists.sourceforge.net,
wsjt-devel-ow...@lists.sourceforge.net
Cc: Christopher Diederich <k1...@yahoo.com>
Subject: [wsjt-devel] Fwd: 40 Meter Power USB-D issue
Get Outlook for iOS
----------------------------------------------------------------------------
From: Christopher Diederich <k1...@yahoo.com>
Sent: Tuesday, November 19, 2019 8:26 PM
To: wsjtgr...@yahoogroups.com
Subject: 40 Meter Power USB-D issue
Good evening,
I am experiencing a recent issue that has arisen where my IC-7300 is
transmitting on reduced power on 40 meters using FT8 with WSJT-X. Other
digital modes and phone work fine, and no other bands have the low power issue.
Also, the rig occasionally changes from USB-D to USB when keying. Any ideas?
IC-7300
Win 10 Pro 64 bit
HRD version 6.7.0.244
WSJT-X version 2.1.0
73
Chris Diederich K1LDO
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