September 2018 - AMSAT-BB - mailman.amsat.org

cube sat model
by Bob- W7LRD 07 May '21

07 May '21

Hi All-Is there a cube sat model, mock up etc, available anywhere 73 Bob W7LRD

8 7

TLEdoctor program to check for preliminary TLE data
by Jarda 06 Aug '19

06 Aug '19

The program can easily detect and fix the TLE preliminary data errors for working in satellite programs after launching the satellite in orbit The original version of the program released before launching Fox-1D works in Windows-7 and higher. Version that works in Windows XP is now added. The program name for Win-XP changes to TLEdoctor. Both programs can be downloaded at http://oscar.ok2gz.eu/fox1d.php 73 Jarda ok2gz --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

2 1

Fw: AO73 Mode change
by Graham Shirville 11 Jun '19

11 Jun '19

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

9 17

FUNcube-1/AO73 Operations
by Graham Shirville 15 Mar '19

15 Mar '19

Hi All,Just to confirm that AO73 is now in continuous education mode with the high power telemetry. Amateur mode may be expected to resume on Thursday morning(UTC)73GrahamG3VZV

2 2

EQUiSat Optical Beacon CubeSat
by Trevor . 17 Oct '18

17 Oct '18

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/ ----

5 5

Fwd: White House wants to eliminate WWV
by oh2aue＠kolumbus.fi 30 Sep '18

30 Sep '18

Beware: HF content ! In addition to the obvious time and frequency applications there is also a plethora of propagation science that can easily be accomplished by even us mere amateurs. To demonstrate x and o mode propagation, I have often used a setup where I GNSS PPS trigger a regular analogue or digital oscilloscope measuring the audio beat of the received timing pulses. In this manner,the o/x mode superimposed, time delayed aggregate pulse can be observed and the individual time variant (multipath) fading of the LHCP and RHCP combination can be very easily observed and visually separated on the scope screen with a regular HF receiver and e.g. simple (linearly polarised) dipole. Obviously both propagation paths can be observed separated in a similar manner using a dual channel oscilloscope and a circularly dual polarised HF antenna. Extremely interesting to study as the x and o mode MUF's creep past the frequency of observation as a function of E and F layer ionisation: http://www.kolumbus.fi/michael.fletcher/HF_layer1_oblique_nvis_propagation_… http://www.kolumbus.fi/michael.fletcher/60m_band_1000km_oblique_o_mode_x_mo… Michael OH2AUE

1 0

Symposium Registration
by Paul Stoetzer 30 Sep '18

30 Sep '18

Remember that registration for Symposium goes from $60 to $65 at the end of the day today. Like any good amateur radio organization, we run on UTC, so the early-bird $60 rate expires at 23:59:59 UTC. 73, Paul, N8HM

1 0

Missing amateur operator
by johnv＠frontier.com 30 Sep '18

30 Sep '18

I worked AG7E September 15 @ 1913z on AO-91 and looked to see if she was LOTW and per her QRZ.com page, she was not. So I sent a SASE to the current address. This morning I got the letter returned - "Attempted - not unknown - unable to forward". I was in Benton County WA in grid DN06. Are you on the BB Helen? Thank you JohnN7AME

2 1

boom type on Yagi-Uda antenna
by Larry 30 Sep '18

30 Sep '18

Hans: With regard to your question about poor performance on your homebrew LFA- My understanding is that resonance is greatly affected in long boom Yagi-Uda arrays by the boom type. It is not simply a matter of changing the dimensions of the DE but also the parasitic element lengths and spacing. The ARRL Antenna book 23rd edition has a detailed section on the new LFA and OFA antennas, and they caution readers to stick to the 'cookbook' closely or expect to spend a lot of time modeling the new configuration. On short booms, the differences don't make so much difference, but when the boom gets to be several wavelengths long it is an increasingly important factor in radiation pattern and resonance of the parasitic elements. The difference in width of your loop and the DE width is likely also an issue. Have you done any computer modeling of your design? Larry W8ANT

1 0

Es’hail-2 update + Book now for AMSAT-UK Colloquium
by M5AKA 30 Sep '18

30 Sep '18

An update on Es’hail-2 was given at the AMSAT-DL symposium https://amsat-uk.org/2018/09/29/update-on-eshail-2-given-at-amsat-dl-sympos… ESEO student satellite with FUNcube 1260/145 MHz FM transponder to enter final test phase https://amsat-uk.org/2018/09/29/eseo-student-satellite-to-enter-final-test-… FCC 24 and 47 GHz 5G spectrum auction https://amsat-uk.org/2018/09/29/fcc-24-and-47-ghz-5g-spectrum-auction/ AMSAT-UK Construction Competition https://amsat-uk.org/2018/09/29/amsat-uk-construction-competition/ AMSAT-DL President Peter Gülzow DB2OS will be giving a presentation "Es’hail-2 and its amateur radio payload" at the AMSAT-UK International Space Colloquium which is being held as part of the RSGB Convention at the Kents Hill Park Conference Centre in Milton Keynes, October 13-14 https://amsat-uk.org/colloquium/ Trevor M5AKA---- AMSAT-UK http://amsat-uk.org/ Twitter https://twitter.com/AmsatUK Facebook https://facebook.com/AmsatUK YouTube https://youtube.com/AmsatUK ----

1 0