• SDR NEWS/PROJECTS 21 07

    From LU9DCE@21:5/101 to RTLSDR on Sun Jul 21 11:10:43 2019
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    Title : Weather Satellite Meteor M2-2 Now Transmitting Images

    Content : Reports from Reddit and Twitter are in that the recently
    launched Meteor M2-2 weather satellite is now functional and
    broadcasting images at 137.9 MHz. A few people have noted that the
    reception quality appears to be better than the older satellite.

    Title : PICTOR: An Open Source Low Cost Radio Telescope based
    on RTL-SDR

    Content : PICTOR is an open source and open hardware radio
    telescope that aims to promote radio astronomy on a budget. It
    consists of a 1.5 meter parabolic dish antenna, 1420 MHz feedhorn, a
    two stage low noise amplifier (LNA), high pass filter, and from what
    we gather, an RTL-SDR. Future designs may also use higher bandwidth
    SDRs. Currently there doesn't seem to be much information about the
    build and exact components used in their design, but we're hoping
    that those details will come in time.

    Title : A Low Cost 2.4 GHz Downconverter from off the Shelf Dev
    Boards

    Content : Over on GitHub Ian Wraith has released his design and microcontroller code for a low cost 2.4 GHz downconverter circuit
    . A downconverter is a hardware device that shifts the signals that
    it receives into a lower frequency band. This is useful in the case
    of RTL-SDRs and Airspy SDRs, as their maximum frequency range is
    only 1.7 GHz. Ian's 2.4 GHz downconverter reduces those 2.4 GHz
    signals down to 1 GHz, which can then be received with his Airspy.

    Title : SignalsEverywhere: Improving HF Reception with Impedance
    Matching

    Content : This week on the SignalsEverywhere YouTube channel
    host Corrosive explores why impedance matching matters when trying
    to obtain the best reception possible. To do this he reviews the
    NooElec 1:9 Balun, which is designed to convert the (roughly)
    450 Ohm impedance of a long wire antenna or ladder line dipole
    back down to 50 Ohms, which is the standard impedance that an SDR
    expects. Small amounts of impedance mismatch are negligible for RX,
    but larger mismatches can result in poor reception.

    Title : Investigating the Galileo Satellite Navigation System Outage
    with a LimeSDR

    Content : Galileo is a European Union owned satellite navigation
    system. Galileo was created so that the EU does not need to rely
    on the US GPS or the Russian GLONASS satellites, as there is no
    guarantee that these systems won't be purposely turned off or
    degraded by their governments at any time.

    Title : Upcoming KerberosSDR Software Updates: Automatically Estimate
    TX Location and Navigate There

    Content : KerberosSDR is our 4x Coherent RTL-SDR that we've
    developed together with Othernet. It can be used for tasks such as
    direction finding and passive radar. KerberosSDR was successfully
    crowdfunded over on Indiegogo, and the first batch has already
    been shipped. Currently we are taking  discounted pre-orders
    for a second production batch on Indiegogo . Please note that the
    discounted pricing will expire when we ship, which according to
    the manufacturing schedule should be next month, so please get in
    quick if you're interested!

    Title : Signals and Bits A New SDR Podcast by the President of the
    GNU Radio Project

    Content : [ Ben Hilburn ] the president of the [ GNU Radio Project ]
    has recently started a new podcast called [ Signals and Bits ]. If
    you were unaware, GNU Radio is the defacto open source framework for implementing digital signal processing code. Without it, many SDR
    programs that we take for granted may have never been developed
    as it is responsible for a lot of community DSP knowledge and
    algorithm development.

    Title : Artemis 3 Released: Offline Signal Identification Database

    Content : The Signal ID Wiki (sigidwiki) is our sister site
    that we started a few years ago as a way to collect and catalog
    various types of signals that an SDR user might see and hear on
    the airwaves. The idea is that a user could search the database to
    learn about and identify unknown signals. Over time it has grown
    significantly, with now almost 400 known signals with both waterfall
    images and sound samples available in the database. Special thanks
    to lead admin Carl Colena for maintaining and playing a huge role
    in the databases' growth.


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