[amsat-bb] DSLWP UHF Test Plan on May 31, Jun 1 and Jun 3

Wed Jun 6 05:09:45 UTC 2018

The latest version of demod_dslwp_gmsk_b0_250bps_0.5_coherent.grc from
https://github.com/bg2bhc/gr-dslwp includes blocks in the upper-right
corner that may be disabled by default.  If enabled, the "Band Pass
Filter", "Complex to Real", & "Audio Sink" blocks will make demodulated
audio available to your system.

(If using the Live CD version, I don't know if these blocks are available
-- I can only speak to the software running on a dedicated system)

>From there, much like a Virtual Audio Cable in Windows, you would use Pulse
Audio (pavucontrol) to route that audio OUT to the WSJTx application
running on your system.

As I mentioned before, my system is not nearly powerful enough to handle
all that processing in addition to what is required to run the DSLWP
front-end and decoder flowgraphs in GNU Radio.  But if your system IS
powerful enough, that is one way to provide WSJTx with the "B0" audio from
435.400 in hopes that it might decode some JT4G!

Please note that Pulse Audio and WSJTx are not necessarily installed by
default on any given linux system.  So, they would have to be installed to
be available to you.

-Scott,  K4KDR

===========================

On Wed, Jun 6, 2018 at 12:12 AM, Jean Marc Momple <
jean.marc.momple at gmail.com> wrote:

> Scott,
>
> All corrected this side with the help of Wei & Dimitry (thanks to them),
> just stupid things like proxy not running, wrong file path in Program
> Tracking CC etc…
>
> About the JT4: I don’t see it on the GNU drop down it spite it is in the
> Examples directory.
>
> 73
>
> Jean Marc (3B8DU)
>
> > On Jun 6, 2018, at 1:17 AM, Scott <scott23192 at gmail.com> wrote:
> >
> > In my case, packet drops are caused by running out of system resources
> > (CPU, memory).
> >
> > To allow me to run the essential parts of the decoders, I have disabled
> all
> > unnecessary waterfalls, constellation GUI, etc.   I also close any other
> > apps running on my computer, including background apps like Dropbox.
> >
> > As for "Connection refused", if I am not mistaken that is when a decoder
> is
> > started without the proxy application running.  (You can certainly
> disable
> > "KISS Encode PDU" & "Socket PDU" blocks if you would like to test those
> > flowgraphs without a proxy connection!)
> >
> > If you would like help with the JT4 aspect, please provide more detail.
> > FYI, for me it put too much burden on system resources.  So, I have
> > disabled those blocks that make audio-OUT available for use by WSJTx.
> >
> > Instead, I use a different SDR / different computer to listen for JT4G.
> >
> > 73!
> >
> > -Scott,  K4KDR
> >
> >
> > ==============================
> >
> >
> > On Tue, Jun 5, 2018 at 1:20 AM, Jean Marc Momplé <
> jean.marc.momple at gmail.com
> >> wrote:
> >
> >> Dimitry,
> >>
> >> I get the same message about packet drop or RuntimeError: Connection
> >> refused, have you been able to solve this?
> >>
> >> Also the JT4 Flowchart does not seems to work.
> >>
> >> Reading the GNU Radio Tutorials to try to understand...
> >>
> >> 73
> >>
> >>
> >> Jean Marc (3B8DU)
> >>
> >> On 2 June 2018 at 21:26, Dimitry Borzenko <4z5cp at bezeqint.net> wrote:
> >>
> >>> Hello Wei and group.
> >>> Have checked new LiveCD- makes problem, FrontEnd DSLWP RXRTL loads 4 i7
> >>> CPUs 90%, so demodulator doesn't works terminal show message about too
> >> many
> >>> packet drops.....
> >>>
> >>> de 4z5cp
> >>>
> >>> ------ Original Message ------
> >>> From: "韦明川" <wmc_jx at 163.com>
> >>> To: "amsat-bb at amsat.org" <amsat-bb at amsat.org>
> >>> Sent: 31.05.2018 11:32:18
> >>> Subject: [amsat-bb] DSLWP UHF Test Plan on May 31, Jun 1 and Jun 3
> >>>
> >>> Hi OMs,
> >>>>
> >>>>
> >>>> We are planning two tests for UHF of DSLWP-B, from 31 May 16:00 UTC to
> >> 31
> >>>> May 18:00 UTC, and from 1 Jun 02:00 UTC to 1 Jun 04:00 UTC.
> >>>>
> >>>>
> >>>> We will change the mode of the transmitters to 250 bps GMSK and JT4G
> on
> >>>> 435.4 MHz (GMSK every 5 min, JT4G every 10 min, JT4G has higher
> >> priority),
> >>>> and 250 bps GMSK on 436.4 MHz (every 5 min). Corresponding demod grcs
> >>>> should be used.
> >>>>
> >>>>
> >>>> Some more tests are planned on Jun 3, and detailed time TBD.
> >>>>
> >>>>
> >>>> The temperature of onboard batteries is a little higher than expected,
> >>>> that's why UHF is not always on.
> >>>>
> >>>>
> >>>>
> >>>> Tracking file updates can be found on: https://github.com/bg2bhc/dslw
> >>>> p_doc or http://lilacsat.hit.edu.cn/tle/program_tracking_dslwp-b.txt
> >>>>
> >>>>
> >>>> Updated version of Live CD:
> >>>> https://drive.google.com/file/d/1Ptga7XfgQ--qsnD4QhpNiRRUIW3
> >>>> c626L/view?usp=sharing
> >>>>
> >>>>
> >>>> Best Regards and 73!
> >>>>
> >>>>
> >>>> Wei BG2BHC
> >>>>
> >>>> --
> >>>>
> >>>> WEI Mingchuan
> >>>>
> >>>>
> >>>> Research Center of Satellite Technology
> >>>> Harbin Institute of Technology
> >>>> mobile: +86-189-4501-5242
> >>>> e-mail: wmc_jx at 163.com; bg2bhc at gmail.com