ARLA/CLUSTER: A intensidade do sinal das duas emissoras rádioamadoras da ISS: Ericsson versus Kenwood D700

[João Costa > CT1FBF]

Signal strength of the two ISS ham radio stations
*Henk Hamoen PA3GUO* used his FUNcube Dongle SDR to produce a video showing
the variations in signal strength between the two amateur radio stations on
the ISS

The amateur radio station in the Russian Service Module uses a Kenwood D700
transceiver which is understood be on its lowest power setting of 5 watts
output and feeds a whip antenna on the Module. When acting as a packet
radio digipeater it transmits data on 145.825 MHz.

A second amateur radio station in the European Space Agency (ESA) Columbus
Module is usually used for voice communication. It comprises Ericsson
handheld transceivers believed to be capable of 5 watts output to a whip
antenna on the exterior of the module. When the radio hams on-board the ISS
talk to other radio amateurs on Earth they transmit on 145.800 MHz.

Both stations use 5 kHz deviation FM (25 kHz channel spacing).

Henk PA3GUO writes:

*FCD SDR recording of ARISS Italy school contact with astronauts onboard
the ISS. Purpose is to show the signal strengths of the 2 transceivers
onboard ISS: Ericsson Voice transceiver (left) and Kenwood data transceiver
(right). At time 11:54z [2013-06-29] my antenna had to turn 180 degrees,
signal is lost for a while. Remarkable: at the beginning voice TX signal is
strong, even a bit stronger as data TX signal. At the end of the pass data
keeps strong, voice fully drops into the noise. Seems the antenna of the
Voice [ESA Columbus Module] transceiver is somewhat (more) shielded by the
ISS exterior (e.g. solar panels).

29 June 2013, school contact Italy with International Space Station
Frequency: 145.800 + 145.825 MHz
Antenna: 6 elements + 15 meters Aircell coaxial cables
Receiver: FCD SDR + SSB pre-amp (mounted next to the FCD SDR)
Software: HDSDR (SDR receiver) + SatControlFCD (DK3WN freq control)*

Watch ARISS Italy ISS SDR recording (speech and data spectrum)
http://www.youtube.com/watch?feature=player_embedded&v=RfNM3bzRW_E


 Russian Service Module amateur radio antennas
http://knts.tsniimash.ru/shadow/en/FAQ.aspx
http://www.marexmg.org/hardware/antennas.html

Astronaut Radio Amateurs
http://www.w5rrr.org/astros.html

PA3GUO website
http://www.pa3guo.com/
-------------- próxima parte ----------
Um anexo em HTML foi limpo...
URL: http://radio-amador.net/pipermail/cluster/attachments/20130714/395b0d8f/attachment.html