On 21/11/2014 01:17, Chris Elmquist wrote: Hi Chris, > I am having an issue with WSJT-X v1.4.0-rc2 on Linux with a MicroHam-III > USB sound card interface and an Icom 746PRO CAT-connected radio. I am > using the build offered here, > > http://physics.princeton.edu/pulsar/K1JT/wsjtx-1.4.0-rc2.x86_64.rpm > > The issue is that whenever the software commands the radio via CAT, > DTR is asserted on the serial device (/dev/ttyUSB0) and this causes > the radio to go into transmit. DTR is never desserted after the CAT > command has completed and so the radio stays transmitting until I power > it off, kill the app or it burns up :-) This occurs as soon as the app > is launched, presumably because it is querying the radio for current > operating frequency, mode, etc. Can you list the settings you have on the WSJT-X "Settings->Radio" page please? > > I also use the stock build of FLDigi software (which uses hamlib too) > on this same hardware configuration and it does not exhibit this problem. > > The MicroHam-III interface might be somewhat unique in that it uses > DTR on the CAT port to pull the PTT line for the radio but this is their > "off-the-shelf" configuration with their stock radio cable and recommended > jumper settings in the interface so I am inclined to fix the software > and not call it a hardware issue. > > I believe FLDigi does not have this problem because when they open the > CAT port, they must immediately issue a termio function to deassert DTR > (and RTS) and then only assert those if they are the selected PTT method. > If PTT is done by CAT command, DTR should never be asserted. > > I can force DTR to drop by issuing, > > stty -F /dev/ttyUSB0 hupcl > > from another window so I do this to keep the radio from actually > burning up ;-) > > I am running on Fedora Core 20 and I have asked Josh (who recently > posted a success with FC20 and r3609) for his build recipe and if I can > successfully build this newer version, I can probably offer a fix/patch > for the problem. > > 73, Chris 73 Bill G4WJS.
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