[hfsig] WsprryPi sends tone only for a few seconds

[Simon Quellen Field]

I am running WSJT-X on a receiver a couple feet from the RPi, and I can see
(and hear) the beautiful tone
from the radio and in the waterfall, but the tone stops after only a few
seconds, despite the program thinking
that it is still transmitting.

I first tried it on my newest Pi 3 B+, and thought that maybe it was the
faster processor confusing things,
but when I went to an older Pi 3 B, I got the same results. The duration of
the tone is variable, sometimes
only a second or two, and sometimes as long as 10 or 15 seconds. But never
long enough to send the whole
message.

This is on a new SD card, with today's Raspian Stretch built from NOOBS,
following the instructions:

sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get install git
git clone https://github.com/JamesP6000/WsprryPi.git
cd WsprryPi
make


My command line was:
sudo ./wspr -r -o -s AB6NY CM87xe 20 20m


Does this sound like a problem with the board?
​Or is there a known problem with the latest software?

I've read through the source code, and there isn't anywhere that aborts a
transmission early.
The program thinks it is still transmitting for the whole 110.686 second
transmit window.​
The shortest transmission printout on the screen is 110.669 seconds, and
the longest was
110.688 seconds. But the tone in the receiver only lasts 5 seconds on
average.

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