AMSAT-BB October 2017

134 participants
264 discussions

by Graham Shirville

Hi folks, AO73/FUNcube is now in amateur mode for the weekend with the transponder on! Please see below for all FUNcube mission info 73s Graham G3VZV and the FUNcube team. ++++++++++++++++++++++++++++++++++ FUNcube frequencies and other details ++++++++++++++++++++++++++++++++++ AO-73 FUNcube-1 The transponder is normally operational only when the satellite is in eclipse, ie the solar panels are NOT being illuminated. During weekends (from pm Fridays UTC to PM Sundays UTC) the transponder is operational 24/7. When the transponder is switched off, the telemetry beacon is on full power, when the transponder is on the beacon it is on low power. During holidays, eg Christmas, New Year, Easter, etc, the transponder maybe activated for extended periods. Watch AMSAT-BB for announcements which are usually made on Friday evenings (UTC) The nominal transponder frequencies are: Uplink: 435.150 - 435.130 MHz LSB (Inverting) Downlink: 145.950 - 145.970 MHz USB Telemetry Tx: 145.935 MHz BPSK (The passband may be up to 15kHz higher depending on on-board temps. Lower temperatures give higher freqs!) FUNcube-2 (aka FUNcube on UKube) The FUNcube-2 sub-system continues to operate autonomously and, almost continuously, in amateur mode. The transponder is operational and the telemetry downlink is functioning with about 70mW output. The FUNcube-1 Dashboard does not correctly display the telemetry but it does correctly decode the data and uploads it to the FUNcube Data Warehouse from where it can be examined. Most of the real time data channels are operational and these include battery voltages, temperatures and ADCS data coming via the main On Board Computer (OBC). The transponder is interrupted for a few seconds every 2 minutes when the other transmitter sends its CW beacon and, occasionally, for a few seconds when the main OBC reboots (approx seven times each orbit). The nominal transponder frequencies are: Uplink: 435.080 - 435.060 MHz LSB (Inverting) Downlink: 145.930 - 145.950 MHz USB Telemetry Tx: 145.915 MHz BPSK (The passband may be up to 10kHz higher depending on on-board temps. Low temperatures give higher freqs!) EO79 FUNcube-3 Due to power budget constraints the transponder cannot be operational 24/7 and an orbit specific schedule has been developed. The transponder will commence operation 27 minutes after the spacecraft enters sunlight and will stay on for a period of 25 minutes. This schedule may be modified in future months as a result of experience. The nominal transponder frequencies are: Uplink: 435.0723-435.0473 MHz LSB (Inverting) Downlink: 145.946-145.971 MHz USB Further detailed info on EO79 transponder frequencies is at: https://amsat-uk.org/2016/11/10/eo79-funcube-3-transponder-commences-regula… EO88/Nayif-1/FUNcube-5 EO88 is presently operating in autonomous mode. The transponder is operational when the satellite is in eclipse, ie the solar panels are NOT being illuminated. When the transponder is switched off, the telemetry beacon is on full power, when the transponder is on the beacon it is on low power. The transponder frequencies are: Uplink: 435.045 – 435.015 MHz LSB (inverting) Downlink: 145.960-145.990 MHz USB Telemetry Tx: 145.940MHz All FUNcube transponders are sponsored by AMSAT-UK and AMSAT-NL. We are very grateful for the assistance given by Innovative Solution In Space Bv, The Netherlands. _______________________________________________ Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

3 years

EQUiSat Optical Beacon CubeSat

by Trevor .

Students at the Ivy League Brown University are developing an amateur radio satellite EQUiSat that will carry a Xenon Flash Tube (XFT) subsystem to act as an Optical Beacon that should be visible to the unaided eye of observers on Earth. See http://www.uk.amsat.org/?p=10635 73 Trevor M5AKA AMSAK-UK http://www.amsat-uk.org/ ----

3 years, 8 months

Using 1.2Ghz

by Todd

Thinking about adding the 1.2Ghz module for my 9100. Prices have dropped a little and units will start become harder to find once production ends. Anybody using this band? I read it's used as a uplink frequency for some satellites. Any input appreciated.ToddAL7PX

4 years, 2 months

Outernet L-Band now carries AMSAT and ARISS weekly bulletins

by Robert Bruninga

The Outernet L-band feed is now carrying a condensed version of the AMSAT and ARISS weekly news files. (Global Geosat coverage except for Northern Alaska)... Receivers are simple: http://aprs.org/outnet.html For ARISS, I manually added a 2 char grid square to each school listed in the school schedule and am asking the outernet folks to parse out that location info and plot a 1200 km footprint on their weather globe showing where people can tune in the ARISS contacts. Then their RTL-SDR dongle could then actually be retuned to hear the contact. Just an idea... Bob, WB4APR -----Original Message----- From: AMSAT-BB [mailto:[email protected]] On Behalf Of Dani EA4GPZ Sent: Saturday, October 15, 2016 7:36 AM To: amsat-bb(a)amsat.org Subject: Re: [amsat-bb] New Outernet L-Band service... >> I hope someday a service like this will be available >> from an AMSAT geostationary service. > I'm pretty confident that the guys at AMSAT-DL are capable > of doing this much better on the upcoming EsHail'2 > than what Outernet is currently doing on Inmarsat... > They already have in mind a "DVB-S beacon"... broadcast > from the ground station at Qatar ... carrying videos > about Ham radio and Ham radio events on this signal. > What is more, if you have equipment to operate EsHail'2 on SSB, > it's more or less easy to use either the narrowband transponder > or the wideband transponder to transmit an Outernet-type signal > through EsHail'2, so anyone can have a go with this. > Outernet uses 4200baud BPSK and half of the bitrate is spent for FEC. > You can use a bit less bitrate to get a signal that will even pass > through a conventional 2.7kHz SSB filter and you can use less > bits for FEC to get increased data throughput (but more SNR required). > Dani EA4GPZ.

4 years, 3 months

Special AMSAT Membership Offer for RadFxSat..download issue

by Jack Strother

Hi Paul, I have already left a note to the webmaster, no reply yet. I tried to download from the link in the receipt e-mail, and a message comes back saying that I have no downloads available. I have not down loaded squat, yet. Thanks in advance, for any help on this. I am so excited about the launch.. Jack KD9ERA

4 years, 7 months

Turnstile Antenna Design

by vk4tec＠tech-software.net

http://59.167.159.165/satreporter/turnstile.pdf

4 years, 7 months

FUNcube-1 weekend operations

by Graham Shirville

Hi All, FUNcube-1 AO73 is now in full time transponder mode for the weekend. Have FUN with the bird 73 Graham G3VZV

4 years, 7 months

SatPC32

by Joe Pereira

Does anyone know if it is possible to output a serial port signal when a satellite is in view. I would like to switch an external relay circuit when a particular satellite is in view. Regards Joe - VK5EI

4 years, 7 months

C# DDE code

by richard allen

Microsoft seems to be getting rid of DDE support. Does anyone have some C# or VB2017 DDE client code that can be built under Visual Studio 2017? Thanks, Richard W5SXD

4 years, 7 months

FO-29 transponder block diagram

by Dani EA4GPZ

Hi all, A few days ago I have transmitted and recorded a (low-power) FT8 signal through the FO-29 linear transponder to test some Doppler correction algorithms I'm developing (see http://destevez.net/2017/10/wsjt-x-and-linear-satellites-part-ii/) After Doppler correction, I'm left with a linear frequency drift both in my downlink signal and in the satellite CW beacon. However, the drift rate of my signal and the beacon are different. Specifically, my signal drifts 1.26 times faster than the beacon. I suspect that this drift is due to one of the local oscillators in FO-29. To understand this better, I need to look at a block diagram of the FO-29 linear transponder. The best I've found is this: http://www.jarl.org/English/5_Fuji/systeme.gif However, I need something similar to this: https://funcubetest2.files.wordpress.com/2010/11/funcube_rf_board_block_dia… Since I need to see the frequencies of all the local oscillators involved in the transponder and CW beacon. Is there a more detailed block diagram for FO-29 or does anyone know something about this information? 73, Dani EA4GPZ.

4 years, 7 months

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AMSAT-BB October 2017