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Ham Satellite news

Tracking Artemis-1 with PstRotator

Thank you Codrut YO3DMU of PstRotator for the following info:

You can use the DSN module of the PstRotator program for Artemis-1 tracking. The program automatically download the necessary files from Horizons and use them to control the rotator and the radio with Doppler corrections.

At this moment the ephemeris are not yet available, but these will be at a short time after a successfully launch.

You can find here the Artemis 1 mission frequency allocation: https://sgcderek.github.io/blog/artemis-1.html 
The Omotenashi satellite will be interesting as it will use UHF (437 MHz).

Categories
Ham Satellite news

OMOTENASHI to the Moon 29 aug 2022

Info from ANS:

OMOTENASHI Project Shoots for the Moon This Week

OMOTENASHI, a project of the JAXA Ham Radio Club, is a CubeSat which will be launched by NASA SLS rocket, scheduled for August 29. It plans to land on the surface of the moon, and to transmit a beacon in the amateur 70cm band.

OMOTENASHI is one of the EM-1 CubeSat missions which will be launched by the NASA/SLS rocket (EM-1) together with the main mission of ORION experimental module on Monday. JAXA Ham Radio Club is going to utilize the flight demonstration opportunity of the OMOTENASHI mission to conduct the following amateur radio missions:
(i) To conduct technological research with respect to receiving ultra-weak UHF signal from a space probe toward the moon
(ii) To conduct an outreach activity providing amateur radio operators all over the world with an opportunity to try to receive signals from moon region.

OMOTENASHI is a 6U-CubeSat with external dimensions of 239 x 366 x 113mm and an approximate mass of 14 kg.

OMOTENASHI consists of three modules: orbiting module, retro motor module, and surface probe. During the moon transfer orbit, these modules are integrated. When OMOTENASHI arrives at the moon, the surface probe will be separated and conduct semi-hard landing.

OMOTENASHI is actively controlled by ultra-small attitude control system including star tracker, sun sensor, IMU, reaction wheel, and cold gas jet thruster. During the moon transfer orbit, OMOTENASHI may be spin-stabilized due to the strict resources. For further details, please see: https://www.isas.jaxa.jp/home/omotenashi/JHRCweb/jhrc.html

There will be UHF CM/PSK/PM/PSK31 beacons, with 1 watt RF, on both the orbiting module and the surface probe. CisLunar explorer, MIT KitCube and Lunar IceCube are expected to share the same launch.

Orbiting Module DOWNLINK

Frequency
    437.31 MHz
Antenna
    SRR antenna
Polarization
    Linear
Modulation
    beacon, PSK31
Sync Word
    C1 (ASCII code)
Power
    30dBm

Surface Probe DOWNLINK

Frequency
    437.41 MHz
Antenna
    invert-F antennax4
Polarization
    LHCP(, RHCP)
Modulation
    FM, PSK31, PCM-PSK/PM
Sync Word
    C1 (ASCII code)
Power
    30dBm

Amateurs can constantly access the newest TLE from https://bit.ly/3wyopTr This file will be overwritten when we have calculated the next TLE during operation.

[ANS thanks JAXA Ham Radio Club for the above information]


Categories
Ham Satellite news

Ham radio satellite on the moon 2022

Source: ARRL and OMOTENASHI Project

Japan’s OMOTENASHI, the world’s smallest moon lander, will have an X-band and UHF communication system, although it will not carry an amateur band transponder. OMOTENASHI is a 6U CubeSat set for launch via a NASA SLS rocket as early as February 2022. It will have a mission period of from 4 to 5 days. The name is an acronym for Outstanding Moon Exploration Technologies demonstrated by Nano Semi-Hard Impactor. Wataru Torii of the Japan Aerospace Exploration Agency (JAXA) Ham Radio Club, JQ1ZVI, said radio amateurs can play a role in gathering data from the spacecraft.

The spacecraft is made up of two separable components, both having independent communication systems — an orbiting module and a surface probe. The orbiting module will take the surface probe to the moon. It will transmit beacon or digital telemetry data on UHF (437.31 MHz). The surface probe — the moon lander — will transmit digital telemetry or three-axis acceleration analog-wave with FM modulation on UHF (437.41 MHz). Transmitter power will be 1 W in both cases.

“If we succeed in receiving the UHF signal from the surface probe, we could know the acceleration data on the impact on the moon and the success of the landing sequence,” Torii explained.

“We already have a station for uplink and downlink at Wakayama in Japan — used as an EME [moonbounce] station. However, if the satellite is invisible from Japan, we cannot receive the downlink signal. So, we need a lot of help from ham radio stations worldwide.” Torii noted that the RF system on the lander only operates on UHF.

The orbiting module beacon will transmit on 437.31 MHz using PSK31. The surface probe beacon will transmit on 437.41 MHz using FM, PSK31, and PCM-PSK/PM.