November 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

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AMSAT: RFI from LED bulbs?
by Robert Bruninga 19 Jul '20

19 Jul '20

I am hearing reports of RFI from these LED bulbs. Not just HF, but also VHF. If you can make any quantitative assessments of such RFI, please let me know. And the amazing thing is that at VHF you will never notice it because RFI is noise power and it is noise power that keeps a squelch CLOSED. Manuallly open the squelch and sometimes RFI will show full scale on the S meter yet not open the squelch. And on my radios, when the squelch is closed, the S meter is inactive and shows 0. Bob Bruninga, WB4APR

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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

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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

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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

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Re: [amsat-bb] HRD tracking errors
by Francis Geraci 29 Jan '19

29 Jan '19

Terry, Thanks for the thoughts. I "combed" thru the Keps. I did notice that AO-91 had a catalog # of 43015, not 43017. I corrected that. Still, no Joy. AO-92 is OK. AO-85 still a problem, and AO-91 is still 30 minutes off. It definitely is something with the Keps. HRD and SatPC32 use different "element sets". SatPC32 uses "nasa.txt", HRD uses "nasabare.txt and amateur.txt". I need to figure out how to get "nasa.all" into HRD. And, one of the 2 element sets, in HRD, is loading 3 keps entries for AO-91, each with different "catalog numbers", as noted above. Also, I have noticed with each "update" (many), the sat track gets slower loading. There is an "upcoming" update. I may try and "uninstall" HRD, reinstall with a "fresh" copy. Thanks again. Best from the "Florida Keys" WB1FXX On Thu, Nov 8, 2018 at 8:25 PM Wendy and Terry Osborne < wandtosborne(a)gmail.com> wrote: > Hi Francis, > > Do you have multiple entries for AO-91 and AO-85? > I have found this to be a problem with some other tracking programs. > What happens is that you load the keps just after launch before the sats > have been finally identified. > The keps are then updated with a different object number and you get 2 > entries for a given sat. > > I've just downloaded a demo of HDR Sat and I just have 1 entry for each > and > it tracks correctly. > > 73, > Terry Osborne ZL2BAC > > -----Original Message----- > From: Francis Geraci > Sent: Friday, November 09, 2018 6:24 AM > To: Suryono Adisoemarta via AMSAT-BB > Subject: [amsat-bb] HRD tracking errors > > I use HRD Sat., SatPC32 and Amsat Droid. > SatPC32 and Amsat Droid agree on position of FM birds, HRD shows some birds > 30 min. earlier than expected. Mainly, AO-91 and AO-85. Anyone else noticed > this tracking error ? > I have "poured" thru ALL HRD's settings, reloaded keps, etc. Nothing seems > to correct this tracking anomaly. Grrrrr. > > Best to All - WB1FXX > _______________________________________________ > 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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HRD tracking errors
by Francis Geraci 28 Jan '19

28 Jan '19

I use HRD Sat., SatPC32 and Amsat Droid. SatPC32 and Amsat Droid agree on position of FM birds, HRD shows some birds 30 min. earlier than expected. Mainly, AO-91 and AO-85. Anyone else noticed this tracking error ? I have "poured" thru ALL HRD's settings, reloaded keps, etc. Nothing seems to correct this tracking anomaly. Grrrrr. Best to All - WB1FXX

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Antenna separation on crossboom
by Bob Hammond 15 Dec '18

15 Dec '18

I'm putting the following antennas on an 8-foot fiberglass crossboom: M2 2MCP8A, 143-148 MHz C{ Gulf Alpha 70cm 8x8 CP WiMo Helix 23 I'm not sure how to calculate the proper spacing on the crossboom. I assume the 2m antenna should go on one end and the 70cm antenna on the opposite end. Can I mount the 23cm helical antenna very near the rotator without harm since it has the solid reflector behind the helix? Bob W7OTJ (was WL7CQX)

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K2BSA/5 on AO-91 Saturday
by tjschuessler＠verizon.net 03 Dec '18

03 Dec '18

As part of a Radio Merit Badge program this Saturday, I will be involving the Scouts in an AO-91 pass with my AOS at 1806Z, 29 degrees east max elevation. We will again be using the callsign K2BSA/5 for the day and this pass. If you hear us, please call us and get some scouts excited about Amateur Radio in Space 73 Tom Schuessler, N5HYP EM12ms

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FUNcube Site Navigation
by David Johnson 02 Dec '18

02 Dec '18

HI, As we migrate the FUNcube data warehouse, we have made small change to the new warehouse at http://data.amsat-uk.org The FC1 mission link is now pointing back to original site. You can still access the new one directly at http://data.amsat-uk.org/ui/fc1-fm To all those uploading data to the new site THANK YOU, it aids testing greatly. Dave, G4DPZ

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