HamTV Home Page

HamTV Status

In principle, the HamVideo DATV transmitter is permanently transmitting from Columbus, the European ISS  module. The camera is not activated. These so-called “blank transmissions” are used by ground stations for fine tuning their setup. The transmit frequency is 2395 MHz.

    For different reasons, blank transmissions must be interrupted now and then.
    Scheduled “power downs” are published here.

HamVideo  is off presently.

Moreover, the MagVector experiment will be conducted on Columbus from GMT 209 (Jul 28th) to GMT 214 (Aug 2nd) Ham Video will be powered down and up on the same dates, respectively.

 

HamTV Helpdesk

    The HamTV Technical Team will try and answer your questions relative to the setting up and the use of a HamTV ground station.

 

MiniTiouner : The Up-to-Date HamTV Receiver

 

HamTV : Digital Amateur Television from the International Space Station

 

DATV Technology

 

HamTV Ground Stations

 

Links

 

MiniTiouner Hardware

The following is adapted from a presentation by Jean-Pierre Courjaud F6DZP at the ARISS international meeting, Houston 2016 The MiniTiouner is a DATV receiver designed by Jean-Pierre Courjaud F6DZP.  With dedicated software it is perfectly suited for HamVideo reception. The MiniTiouner is a NIM based receiver. The “Network Interface Module” or NIM supports several tasks: …

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Minitioune Software

Minitioune Software by Jean-Pierre Courjaud F6DZP.  This screen shot shows the MiniTiouner receiving an excellent signal: Frequency: 1255MHz RF Power: -64 dBm MER: 31.8 dB (Modulation Error Ratio) – Digital S/N Ratio Constellations: strong concentration, proving excellent QPSK demodulation   The Minitioune software in Expert Mode  Central Panel  The tuner is never on the wanted …

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SP3QFE

Armand Budzianowski, SP3QFE working on his HamTV dish  Most HamTV ground stations use a 1.2m dish. With accurate azimuth and elevation tracking, they receive the signal for 5 to 6 minutes during a favorable pass. For ARISS school contacts, 3 or more ground stations, located 800 km to 1000 km from each other along the …

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ISS

HamTV – Overview

  ARISS HamVideo Transmitter on board the International Space Station   Name definitions “HamVideo” is the name of the Digital Amateur Television (DATV) transmitter on board the Columbus module of the International Space Station (ISS) “HamTV” refers to the amateur radio DATV activities involving HamVideo     HamVideo characteristics Ham Video downlink frequencies: 2369 MHz …

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HamTV Power Levels

The HamVideo power levels in the table at the bottom of this page result from worst case computations, intended for the  evaluation of system efficiency. See Link budget computation by I0KPT. As shown in fig 2, the ISS orbits at about 400km above the surface of the earth. That is the distance between the ISS …

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HamTV reception with TT S2-1600 PCI card

Since 2014, ground stations have used the Techno Trend TT S2-1600 PCI card for reception of the DATV signals transmitted by the HamVideo transmitter. This card is not produced anymore, but some are offered for purchase on Ebay. The TT S2-1600 PCI card comprises: a zero tuner a QPSK DVB-S demodulator a Transport Stream to …

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Tutioune 1600 receiving software

Jean-Pierre Courjaud F6DZP wrote dedicated software for the reception of HamVideo signals. The Tutioune 1600 software commands the TT S2-1600 PCI card and handles the transport stream. In ISS mode it also adds the missing DVB tables. The program not only delivers video and audio, but also provides technical parameters such as RF power and …

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Noise Power Measurement tool (NPM)

Noise Power Measuring Tool  Jean-Pierre Courjaud F6DZP wrote software to facilitate antenna setup. The Noise Power Measuring tool (NPM) can be used to measure the sun noise on S-band. A special version of Orbitron/whispDDE sends commands to the azimuth and elevation motors, providing offsets  from minus 10° to plus 10° from the sun coordinates. The …

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Tiny Spectrum Analyser (TSA)

Tiny Spectrum Analyser for the TT S2-1600 card by F6DZP  With the Tiny Spectrum Analyser we have a detailed view on incoming signals. On the screen print above we observe WiFi interference. The Tiny Spectrum Analyser is also useful for testing filters such as those built by Kerry Banke N6IZW for the Europeanchain of HamTV …

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European chained HamTV ground stations

To provide 10 minutes of HamVideo reception, a chain of ground stations located along the pass of the ISS footprint, is needed. In Europe, the following stations participate to this chain: For descending passes: EI9FHB, Cork, Ireland F6DZP, Poitiers, France IK1SLD, Casale Monferrato, northern Italy IZ7EVR, southern Italy (not operational) On the world map, one …

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Introduction to digital satellite television technology

Gaston Bertels – ON4WF The Moving Picture Experts Group (MPEG) is a working group of authorities that was formed in 1988 by ISO (International Organization for Standardization) and IEC (International Electrotechnical Commission) to set standards for audio and video compression and transmission. First published in 1996, H.262 or MPEG-2 Part 2 is a video coding …

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Measuring DVB parameters for DATV reception

Adapted from a paper by Jean-Pierre Courjaud – F6DZP Gaston Bertels – ON4WF IQ Symbols and Constellations A DVB-S transmitter produces a continuous Transport Stream of data (see Introduction to digital satellite television technology). The Transport Stream modulates the RF carrier. In general, DATV uses QPSK modulation. The data transmitted are IQ Symbols or “Symbols” …

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