[amsat-bb] DSLWP Successful Configurations and Subsequent UHF Test Plan

[Jean Marc Momplé]

Dear All,

Tested this morning during DSLWP (Longjiang 2) Tx between 06:00 and 08:00
UTC, no luck no signal received in spite everything OK and tested several
times yesterday. The set-up is RTL SDR (tried also with TS-2000), feeder:
30m of 1/2" heliax + 3m of RG213, DBA-270 preamp and Hy-gain UB-7030SAT
antenna, basically the same station I used for LEO's.

More or less expected, but was worth giving it a try, hopefully it will
work with JT4.

I will try again GMSK, particularly if there is a night transmission in
future (less noise).

First quick conclusion is that I need much more antenna gain for the GMSK
mode (some already mentioned that), need to figure out what mechanically
possible on my apartment roof to get maximum possible gain.

To those successful today congratulations.

73

Jean Marc (3B8DU)

On 10 June 2018 at 16:25, Jean Marc Momple <jean.marc.momple at gmail.com>
wrote:

> Wei & all,
>
> Everything working this side, decoded the raw file and uploaded on the
> server successfully.
>
> Unfortunately could not take the opportunity of this morning transmission
> as a brand new preamplifier installed yesterday (tested OK) blew the fuse
> this morning and went SK. I replaced it today.
>
> So ready for tomorrow’s transmission and if ever possible to receive the
> sat with a 2 x 15 ele. circular polarized antenna, DBA-270 preamp + 30m of
> 1/2” heliax feeder, I should make it. If not will wait for JT-4
> transmission.
>
> Any idea what is the best Polarization RHCP or LHCP? would be useful to
> start with the best one. In any case, as I would be at work during the
> pass, I will ask the XYL to change pol every 15 minutes anyway.
>
> Thanks for all who helped me getting the setup working. Really
> appreciated, quite a good learning exercise.
>
> 73
>
>
>
> Jean Marc (3B8DU)
>
>
>
>
> On Jun 9, 2018, at 9:14 PM, Jean Marc Momple <jean.marc.momple at gmail.com>
> wrote:
>
> Wei,
>
> Thanks for prompt answer.
>
> OK, got it working fine, but not not sure if uploading to you.
>
> 73
>
> Jean Marc (3B8DU)
>
>
>
> On Jun 9, 2018, at 8:33 PM, 韦明川 <wmc_jx at 163.com> wrote:
>
> Hi Jean,
>
> Which recording and flowchart did you use?
>
> for 2MHz recording, you should use frontend_dslwp_replay.grc in
> gr_dslwp/examples.
>
> replay_dslwp_gmsk_250bps_0.5_coherent.grc in dslwp_dev is used for 40kHz
> recording.
>
> Best Regards,
>
> Wei
>
>
>
>
>
> --
> 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
>
>
> At 2018-06-09 23:56:48, "Jean Marc Momple" <jean.marc.momple at gmail.com> wrote:
> >Wei,
> >
> >Thanks for the update.
> >
> >I got everything working today, but could not try decoder with the raw file, getting error c“RuntimeError: file_meta_source: Could not extract sample rate.”. Also change my 30m 70cm feeder from RG213 to Heliax 1/2” to get some  more dB and also put a better preamp for some reasons, hopefully it.
> >
> >Could you please send the link for the updated radio info page mentioned in your mail as cannot find it?
> >
> >Will monitor tomorrow morning and hopefully receive some signal…
> >
> >73
> >
> >Jean Marc (3B8DU)
> >
> >> On Jun 9, 2018, at 1:11 PM, 韦明川 <wmc_jx at 163.com> wrote:
> >>
> >> Hi OMs,
> >>
> >>
> >> Just updated the radio info page of DSLWP with some configurations for successful downlink report. Hope it may help!
> >>
> >>
> >> And the following tests for UHF are planned:
> >>
> >>
> >> 10 Jun 03:40 UTC to 10 Jun 05:40 UTC,
> >> 10 Jun 22:00 UTC to 11 Jun 00:00 UTC,
> >> 11 Jun 06:00 UTC to 11 Jun 08:00 UTC,
> >> 11 Jun 14:00 UTC to 12 Jun 16:00 UTC
> >>
> >>
> >> VY TN & 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 <wmc_jx at 163.com>; bg2bhc at gmail.com
> >>
> >>
> >>
> >>
> >>
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