February 2017 - AMSAT-BB - mailman.amsat.org

Re: [amsat-bb] recomendation brushless controlier
by John Magliacane 07 Feb '17

07 Feb '17

On Tue, 2/7/17, skristof(a)etczone.com <skristof(a)etczone.com> wrote: > I'm curious about this gadget. A Google search of "Fluid momentum wheel" > doesn't turn up anything like what is described. > > Do you have a link for more info? No (sorry). I either read or heard about it many years ago, got a clear mental image of the concept from the description at the time, and that's all I remember. It seemed like a really neat idea to me, and (if I recall correctly) it was an AMSAT innovation. Come to think of it, maybe it wasn't intended for a P3 bird, but maybe for a planned geosynchronous satellite, instead. As such, it may have never been put into practice. 73 de John, KD2BD

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Re: [amsat-bb] recomendation brushless controlier
by John Magliacane 07 Feb '17

07 Feb '17

On Tue, 2/7/17, Nick Pugh <quadpugh(a)bellsouth.net> wrote: > The sat team is looking recommendations for a brushless motor controller for > their momentum wheel. Does the community have any recommendations for a > controller? How about the "Fluid Momentum Wheel" created by AMSAT for one of the P3 birds? (A circular tube of viscous fluid containing magnetic particles that was forced to flow through the tube by pulsing currents through coils wound around the tube. -- Completely solid state. No moving parts.) 73 de John, KD2BD

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recomendation brushless controlier
by Nick Pugh 07 Feb '17

07 Feb '17

The sat team is looking recommendations for a brushless motor controller for their momentum wheel. Does the community have any recommendations for a controller? Thanks nick Office 337 593 8700 Cell 337 258 2527 Helping UL become a world Class Engineering and Educational School Disagree I Learn

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Upcoming ARISS Contact Schedule as of 2017-02-07 06:00 UTC
by AJ9N＠aol.com 07 Feb '17

07 Feb '17

Upcoming ARISS Contact Schedule as of 2017-02-07 06:00 UTC Quick list of scheduled contacts and events: Space Exploration Educators Conference, Houston, Texas, telebridge via K6DUE The ISS callsign is presently scheduled to be NA1SS The scheduled astronaut is Thomas Pesquet KG5FYG Contact is a go for: Thu 2017-02-09 20:30:10 UTC 21 deg Palmetto Scholars Academy, North Charleston, SC, direct via K4PSA The ISS callsign is presently scheduled to be NA1SS The scheduled astronaut is Shane Kimbrough KE5HOD Contact is a go for: Fri 2017-02-10 17:59:18 UTC 38 deg Collège André Malraux, Chatelaillon-Plage, France, direct via F4KJT The ISS callsign is presently scheduled to be FXØISS The scheduled astronaut is Thomas Pesquet KG5FYG Contact is a go for: Mon 2017-02-13 14:00:35 UTC 67 deg (***) 3rd Junior High School, Komotini, Greece, direct via SV7APQ The ISS callsign is presently scheduled to be OR4ISS The scheduled astronaut is Shane Kimbrough KE5HOD Contact is a go for: Fri 2017-02-17 08:58:11 UTC 35 deg (***) **************************************************************************** ** ARISS is always glad to receive listener reports for the above contacts. ARISS thanks everyone in advance for their assistance. Feel free to send your reports to aj9n(a)amsat.org or aj9n(a)aol.com. Listen for the ISS on the downlink of 145.8Ø MHz. **************************************************************************** *** All ARISS contacts are made via the Kenwood radio unless otherwise noted. **************************************************************************** *** Several of you have sent me emails asking about the RAC ARISS website and not being able to get in. That has now been changed to http://www.ariss.org/ Note that there are links to other ARISS websites from this site. **************************************************************************** Looking for something new to do? How about receiving DATV from the ISS? If interested, then please go to the ARISS-EU website for complete details. Look for the buttons indicating Ham Video. http://www.ariss-eu.org/ If you need some assistance, ARISS mentor Kerry N6IZW, might be able to provide some insight. Contact Kerry at kbanke(a)sbcglobal.net **************************************************************************** ARISS congratulations the following mentors who have now mentored over 100 schools: Satoshi 7M3TJZ with 123 Gaston ON4WF with 123 Francesco IKØWGF with 119 **************************************************************************** The webpages listed below were all reviewed for accuracy. Out of date webpages were removed and new ones have been added. If there are additional ARISS websites I need to know about, please let me know. Note, all times are approximate. It is recommended that you do your own orbital prediction or start listening about 10 minutes before the listed time. All dates and times listed follow International Standard ISO 8601 date and time format YYYY-MM-DD HH:MM:SS The complete schedule page has been updated as of 2017-02-07 06:00 UTC. (***) Here you will find a listing of all scheduled school contacts, and questions, other ISS related websites, IRLP and Echolink websites, and instructions for any contact that may be streamed live. http://www.amsat.org/amsat/ariss/news/arissnews.rtf http://www.amsat.org/amsat/ariss/news/arissnews.txt Total number of ARISS ISS to earth school events is 1112. Each school counts as 1 event. Total number of ARISS ISS to earth school contacts is 1076. Each contact may have multiple schools sharing the same time slot. Total number of ARISS supported terrestrial contacts is 47. A complete year by year breakdown of the contacts may be found in the file. http://www.amsat.org/amsat/ariss/news/arissnews.rtf Please feel free to contact me if more detailed statistics are needed. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ The following US states and entities have never had an ARISS contact: Arkansas, Delaware, South Dakota, Wyoming, American Samoa, Guam, Northern Marianas Islands, and the Virgin Islands. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ QSL information may be found at: http://www.ariss.org/qsl-cards.html ISS callsigns: DPØISS, IRØISS, NA1SS, OR4ISS, RSØISS **************************************************************************** The successful school list has been updated as of 2017-02-03 07:00 UTC. http://www.amsat.org/amsat/ariss/news/Successful_ARISS_schools.rtf Frequency chart for packet, voice, and crossband repeater modes showing Doppler correction as of 2005-07-29 04:00 UTC http://www.amsat.org/amsat/ariss/news/ISS_frequencies_and_Doppler_correction .rtf Listing of ARISS related magazine articles as of 2006-07-10 03:30 UTC. http://www.amsat.org/amsat/ariss/news/ARISS_magazine_articles.rtf Check out the Zoho reports of the ARISS contacts https://reports.zoho.com/ZDBDataSheetView.cc?DBID=412218000000020415 **************************************************************************** Exp. 49 on orbit Shane Kimbrough KE5HOD Andrei Borisenko Sergey Ryzhikov Exp. 50 on orbit Peggy Whitson Thomas Pesquet KG5FYG Oleg Novitskiy **************************************************************************** 73, Charlie Sufana AJ9N One of the ARISS operation team mentors

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WX satellites
by Egon 06 Feb '17

06 Feb '17

A bit of topic, I wonder if anybody knows of any software that will decode Goes weather satellite images.. They went from analog to digital about 10 years ago on 1691 MHz. Egon VE6EGN/SA3EGN

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NJ7H NWT Roving
by Mike Diehl 06 Feb '17

06 Feb '17

It looks like Gabe's roving trip to the NWT has come to a close. Despite some setbacks with coax jumpers he was successful at activating many grids in the NWT. I was not able to work them all due to my own setbacks but I wanted to make sure my appreciation was known for all the passes I did manage to work. 18 grids while he was /VE is something to be grateful for and I haven't even counted the grids from the U.S. yet. I do know it's more than enough for a VUCC endorsement. :-) Thanks again, Gabe. 73's Mike Diehl - AI6GS

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Re: [amsat-bb] Helical Antenna for 2-meters
by Rick Tejera 05 Feb '17

05 Feb '17

Please share the link. Sounds interesting 73 Rick K7TEJ Sent from Mail for Windows 10 From: Dave Mann Sent: Sunday, February 5, 2017 12:49 To: amsat-bb(a)amsat.org Subject: Re: [amsat-bb] Helical Antenna for 2-meters Thanks to all! I researched more and found a design on a VK's website. I'll be digging into that real soon now. 73 Dave N4CVX Sent from my iPad > On Feb 5, 2017, at 09:06, Dave Mann <cwo4mann(a)comcast.net> wrote: > > I just did some calculations from the ARRL Antenna Handbook. I came up with a 6-turn helical with a diameter of 25.826" and a length of 121.65". My first thought was "whoa, dude, like OMG!" (I'm a high school teacher, ok?) I rechecked my calculations and came up with same, plus an impedance of 150 ohms. > > Years ago I used a Fritzel Helical for 2m when I was DA1BB and VP2EHF (during Hurricane Luis in 1994 it ended up someplace out in the Anagada Straights between Anguilla and Sombrero Island). > > What say, you all? Advice, comments welcomed > > 73 > Dave, N4CVX > > > Sent from my iPad _______________________________________________ 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

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Re: [amsat-bb] WX satellites
by Ken Alexander 05 Feb '17

05 Feb '17

Hi Egon, Try here. This guy has written all kinds of software for decoding satellite images. http://www.satsignal.eu/ 73, Ken Alexander VE3HLS -------------------------------------------- On Sun, 2/5/17, Egon <ve6egn(a)xplornet.com> wrote: Subject: [amsat-bb] WX satellites To: amsat-bb(a)amsat.org Date: Sunday, February 5, 2017, 6:26 PM A bit of topic, I wonder if anybody knows of any software that will decode Goes weather satellite images.. They went from analog to digital about 10 years ago on 1691 MHz. Egon VE6EGN/SA3EGN _______________________________________________ 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

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Re: [amsat-bb] Helical Antenna for 2-meters
by Rick Tejera 05 Feb '17

05 Feb '17

Yup, I found it. Looks interesting. How was the hamfest? Rick Tejera K7TEJSaguaroAstro(a)cox.net623-203-4121 -------- Original message -------- From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb(a)wd9ewk.net> Date: 05/02/2017 15:37 (GMT-07:00) To: amsat-bb(a)amsat.org Subject: Re: [amsat-bb] Helical Antenna for 2-meters Hi! Try this link: http://www.electric-web.org/2m_helix_antenna.htm 73! Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ Twitter: @WD9EWK On Sun, Feb 5, 2017 at 10:30 PM, Dave Mann <cwo4mann(a)comcast.net> wrote: > HOME BREWING A HELIX, VK5ZAI STYLE > > This is the title of his article, unable to find website again. > > HTH > > Dave > > _______________________________________________ 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

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FUNcube-1 Operations
by Graham Shirville 05 Feb '17

05 Feb '17

Hi All, Just to report that FUNcube-1 is now back in autonomous mode as described below! 73 Graham G3VZV 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. Low 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… 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.

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