Yes, but don't query the NTP servers too often - see
https://www.ntp.org/documentation/4.2.8-series/rate/ amongst others.
I believe NTP is a volunteer effort, so keep the queries to as few as
you can.
See also https://forums.raspberrypi.com/viewtopic.php?t=29255 for other
ideas.
I have a RTC board with one of my Arduino's and it's fine without
regular NTP sync. You could probably also use an Arduino for this, but
from experience don't even think about it without the RTC board!
Alan G0TLK
On 21/05/2024 13:06, Graham c via wsjt-devel wrote:
Another option to consider if using a computer ( i.e. Raspberry Pi or
other ) connected to the internet is to simply set up ntp or chrony
for time keeping on that computer. NTP should keep your computer clock
to within a few 10's of milliseconds - well within the needs of WSJT-X
synchronous modes. One less external device ( GPS module ) - keep it
simple.
cheers, Graham ve3gtc
On Tue, May 21, 2024 at 12:14 AM Roger Rehr via wsjt-devel
<wsjt-devel@lists.sourceforge.net> wrote:
Hi Ev,
If I were doing this with audio as you indicated you want to do, I
would use a Raspberry Pi with a USB GPS Dongle to play the audio
files with GPS-aligned timing, rather than avoiding the WSJT
modes. The RPi has a 3.5 mm jack for audio out at line level, and
you could feed that into your transmitter audio input.
A 4 GB Raspberry Pi (which is what I used) is $55 at adafruit
https://www.adafruit.com/product/4295
and the GPS USB dongle is ~$17 at Amazon
https://www.amazon.com/Navigation-External-Receiver-Raspberry-Geekstory/dp/B078Y52FGQ/
I wrote a simple beacon script using python that cycles through 3
different audio files, each starting at the top of the minute.
The starting times are plenty precise, consistently less than 10
milliseconds off the minute.
You could use one wav file for Q65-60C, one for CW, one for SSB as
you suggest, or you could make it as complicated as you want,
starting files not only at the 0th second of the minute but also
at the 15, 30, and 45 second marks for the shorter modes, and you
could mix modes within any given minute and timing would be preserved.
The simple python script for a beacon cycling among 3 modes, each
starting at the top of the minute is at the URL
https://w3sz.com/BeaconPlayAudio3.py
The python script starts automatically when the RPi boots and the
unit operates as a black box with no need for user intervention or
internet access.
In this test I used for the 3 modes Q65-60C, Q65-15C, and Q65-15A
only because I had audio files for those modes in front of me so
no work was required.
After I click "Send" on this email I will start making a simple
document with the "prescription" describing the details on setting
this up as well as an illustration of the results. The document
should be at
https://w3sz.com/AudioBeaconDescription.pdf by daylight tomorrow
(Tuesday 5/21 EDT).
It might seem tedious in the telling but it would take less than
an hour to set this up from the time the RPi box arrived in the
mail. If you are interested in doing this but not comfortable
with the details, I would be happy to get the RPi set up and
running so that all you had to do was connect the power, plug in
the GPS dongle, and connect the audio cable from the RPi to the
transmitter audio in.
73,
Roger Rehr
W3SZ
On 5/18/2024 02:37 PM, Ev Tupis via wsjt-devel wrote:
Hello all,
Later this fall, I hope to install a constellation of multi-mode
VHF+ beacons. CW, SSB, and MD (machine decodable) all in the
same transmission.
My intention is to record the audio digitally (MP3) and drive a
multimode radio in "SSB" mode, playing it over-and-over.
Is there a WSx mode that does not require the TXing and RXing
stations to be timeslot locked?
I can always fall "back" to PSK31/63 or RTTY, but would like to
explore the WSx approach a bit before I do.
If this is off-topic, I would be happy to receive off-list input,
of course.
Thank you for the work that you do.
Sincerely,
Ev, W2EV
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