ISS SSTV Project in April

Discussion in 'Satellite and Space Communications' started by K6LCS, Mar 21, 2019.

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  1. K3RLD

    K3RLD Ham Member QRZ Page

    Patrick, is there any particular reason why you don't use Audacity to do both the amplification and the resampling? That's what I've been doing. Using sox to resample is a good solution if all you are doing is the resampling, though.
     
  2. VE3CGA

    VE3CGA XML Subscriber QRZ Page

    well could be something else afoot maybe local conditions, rain and heavy clouds but I'd agree their audio was very low. Loads of fun anyway.
    Hopefully next time my AZEL setup is up. Spent most of the day figuring out position sensor wiring so it's water-proof, armored yet flexible for winter icing.
    Horizon coverage might suffer since the 13 ele yagi will be 10' lower, but elevation capabilities should reduce fades between 30 and 60 degrees. Stations are almost as loud near LOS as directly overhead, fades between those elevations.
    Interested to see how 70cm receiption compares with a 19 element yagi vs a cloverleaf omni.
     
  3. WD9EWK

    WD9EWK Ham Member QRZ Page

    No real reason. I knew I had to convert the audio for QSSTV to read those WAV files directly. I could have also used my Win7 laptop with RX-SSTV, and play the WAVs with VLC through a virtual audio cable into that program.

    Last time, when I started using QSSTV, I only had to run the WAVs through sox. Could quickly do that with a script. Maybe next time things will be back to normal with the SSTV audio...

    73!
     
    KS1G likes this.
  4. KS1G

    KS1G Ham Member QRZ Page

    My setup has been omni antenna to TS2000, audio from rear jack to SignaLink to RXSSTV (Win10 laptop) set to auto record. Worked well in February. Because of low audio this time, I switched to the LeoPack with SatPC32 managing antennas and radio, and a preamp in-line at the antenna. Recognizable images for most of the series (I think I'm missing one or 2) and decent OTA copy of a few.

    For some of the weekend passes, I ran PassRecorder in parallel with RXSSTV to record audio I can process with Audacity. Workflow so far has been to isolate the image transmissions, remove noise, then amplify the audio (Audacity has defaulted to > 20dB! sometimes). Need a simpler workflow to get the audio back into SSTV software - RXSSTV doesn't seem to have a native "import audio file" feature and I need to resample and rename the file to get MSSTV to take it. Or move the audio files over a Linux box and do the rest there. (Sox + QSSTV and Patrick has done)
     
  5. IW2BSF

    IW2BSF Ham Member QRZ Page

    RISS Chair Frank Bauer via AMSAT-bb replies to various email concerning SSTV event of the weekend and why getting a solution for low audio issue was not so immediate:

    Please remember that ARISS is not the prime activity on ISS.

    There are over 300 international experiments currently operational on ISS on this

    expedition. I just heard in a teleconference last week that that number
    will go to about 500 experiments in the next 1-2 years.

    Because of the vast number of experiments going on at the same time, we can
    only occasionally get suggestions to the crew to make changes to our
    payload. Any work arounds on any experiment/payload will compete with the
    crew's already fully booked schedule. Several ARISS team members,
    particularly our teammate in Russia, were out of pocket this past weekend.
    Our Russian colleague was informed of the issue early-on and acknowledged
    the issue. But he also needs to get tied into Mission Control. That is
    difficult from afar. And even if we ask for a change, it is challenging to
    get the crew time to make this happen. Especially if it is outside the
    flight planning stage.

    Once we have the Interoperable Radio System on ISS, we plan to augment our
    radio system with a ground commandable capability. We have already
    developed a concept for this capability. Once in place, we will be able to
    do many things with our radio without crew intervention, including mode
    changes to support SSTV, APRS, Voice Repeater, etc.. This capability will
    also be important if we fly ham radio on the Lunar Gateway, which will not
    have crew on it 24/7.

    Please note that to keep ARISS alive and implementing new capabilities
    requires a great deal of funding. As an example, ARISS currently has two
    individuals on travel to NASA Johnson running tests for the interoperable
    radio system. This is one of three travel trips required to get the radio
    system ready for flight. Each one of these trips will cost ARISS about
    $3000 in travel---nearly $10,000 for these three testing events. Also, this
    past week, we spent $1,100 to transport the HamTV that was returned from ISS
    back to Italy to undergo troubleshooting to potentially repair the anomaly
    we experienced on ISS. We have a Fundrazr activity right now to prepare the
    Interoperable Radio System for Launch. We need $150,000 by the end of this
    year and are well short of our goal right now. If you really want to see
    improvements in the ISS radio system from where it is today, please strongly
    consider donating to ARISS. Push the donate button at www.ariss.org. You
    can donate at several levels and even a little at a time on a monthly basis.
    At some donation levels, your callsign and name will be included on the
    interoperable radio system that will fly to ISS!

    Thanks for all your interest and support to ARISS. I hope this helps
    explain a little about what is happening on ISS.

    73, Frank Bauer, KA3HDO

    ARISS International Chair

    AMSAT VP for Human Spaceflight Programs
     
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