[amsat-bb] Power connector for Landwehr preamp?
Anyone know of a source for the 5-pin male power connector for a Landwehr preamp? 73, Bill NZ5N ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: LF Satellite ideas?
Has anyone considered the possibility of applying for an experimental license for such an experiment? AA1VS On Sat, Dec 11, 2010 at 9:13 PM, John Magliacane kd...@yahoo.com wrote: --- On Sat, 12/11/10, Bob Bruninga bruni...@usna.edu wrote: Is 137 KHz possible from space? Bob, My understanding is that LF and VLF emissions of terrestrial origin don't get beyond the 'D' layer, even at night. In fact, the 'D' layer acts as a reflector, rather than an attenuator at these frequencies. Cosmic background radiation maintains sufficient 'D' layer ionization at night. However, your post reminded me of project INSPIRE, which was a plan to transmit VLF signals from the Space Shuttle back in 1992 using a pulsed electron gun in the payload bay. Details on project INSPIRE can be found here: http://theinspireproject.org/index.php?page=faq I'm not sure how this would penetrate the ionosphere except through brute force. Nevertheless, compatible receivers are simple to build and readily available. 73, de John, KD2BD -- Visit John on the Web at: http://kd2bd.ham.org/ ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] timing
Thanks everyone for getting back to me! I did go thru and check the settings for both program and they look good. There are two areas that could be the culprits ,if the WinAos is a sperate program how do I up date the keps? the second area is that I am 205 mtrs about sea level and could not find where to set in the WinAos program if it is necessary/. thanks for any help Jack WA1ZDV ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] FT 847 for sale - EBay
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=110621162052ssPageName=S TRK:MESELX:IT Thanks, Ted, K7TRK ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: LF Satellite ideas? 160m?
Hi Bob. Drats. Bad news.. Good news! I don't think the ionosphere will allow 160 meter downlink propagation... on a regular basis, at least. UoSAT-OSCAR-9 carried HF beacons on 7, 14, 21, and 28 MHz, and if I recall correctly, the only beacon never heard was the one on 7 MHz. So, receiving might be more beneficial than transmitting. It might prove interesting to have the satellite generate a spectrogram of received signals in the form of a GIF image that could be downloaded from the satellite, thereby eliminating the requirement that the receiver's input be within a satellite sub-band. ;-) A spectrogram plot covering a whole orbit might also prove to be very interesting. It might answer questions such as: Can sferics from lightning be received outside the ionosphere? What does the VLF spectrum look like over the poles vs. the rest of the globe? How does solar activity and auroras effect VLF energy above the ionosphere? Can energy from the 50/60 Hz power grid be received in space? 73, de John, KD2BD -- Visit John on the Web at: http://kd2bd.ham.org/ ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Amateur Satellite Frequency Allocations (LF)
Hi, Tevor! The general principle is that the amateur-satellite service has frequency allocations in bands where the amateur service has frequency allocations in all three ITU regions. The only exceptions are in the bands 1260-1270 MHz and 5650-5670 MHz, which are limited to the Earth-to-space direction, and 3400-3410 MHz, which are available in Regions 2 and 3. See RR 5.282. In Region 2, the band 7100-7200 kHz was reallocated effective 29 MAR 2009. See: RR 5.142. Until 29 March 2009, the use of the band 7100-7300 kHz in Region 2 by the amateur service shall not impose constraints on the broadcasting service intended for use within Region 1 and Region 3. After 29 March 2009 the use of the band 7200-7300 kHz in Region 2 by the amateur service shall not impose constraints on the broadcasting service intended for use within Region 1 and Region 3. RR 5.142. But, this is only in Region 2. So, until broadcasters vacate 7100-7200 in regions 1 and 3, the amateur-satellite service won't have a frequency allocation. Make sense?? 73, art. W4ART Arlington VA On 12-Dec-2010, at 03:37 PM, Trevor . wrote: IARU has been successfull in obtaining new global Amateur Service allocations such as 135 kHz and 7.1-7.2 kHz, however, the Amateur Satellite Service seems to have been forgotten. 7.0-7.1 is okay for sats but 7.1-7.2 isn't, Why? is the question that has to be asked. Currently IARU is attempting to get an Amateur Service allocation at 500kHz - should they also be getting that band for the Amateur Satellite Service as well ? Given the significant input of the ARRL into IARU perhaps amsat-bb members in NA could remind ARRL that, where possible, new Amateur allocations should be obtained for BOTH the Amateur and Amateur Satellite Services not just the Amateur Service. 73 Trevor M5AKA ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb Nullum gratuitum prandium. http://afeller.us ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: timing
Hi Jack, please read the WinAOS help file that can opened with the WinAOS Help menu. In the SatPC32 environment WinAOS uses (by default) the same Keps file as SatPC32. So, when you update that Keps file for SatPC32 WinAOS will automatcally use the updated Keps. When you run WinAOS stand allone you can download Keps files, for example nasa.all, with your browser. You will see some download addresses in the SatPC32 Download Keps window. In menu Satellites click on Update Keps to open that window. In your browser open the file as (ascii) text file with, e.g., Wordpad and save it in that format. To choose a Keps file for WinAOS open menu File and navigate to the folder that contains the file. The path and filename will then be saved for later program starts. With WinAOS you can not specify the altitude of your location. The program gives a quick overview over the rising and setting times. For that purpose the accuracy is fully sufficient. 73s, Erich, DK1TB - Original Message - From: Jack Barbera barberaalderw...@yahoo.com To: Amsat Reflector amsat-bb@amsat.org Sent: Sunday, December 12, 2010 8:04 PM Subject: [amsat-bb] timing Thanks everyone for getting back to me! I did go thru and check the settings for both program and they look good. There are two areas that could be the culprits ,if the WinAos is a sperate program how do I up date the keps? the second area is that I am 205 mtrs about sea level and could not find where to set in the WinAos program if it is necessary/. thanks for any help Jack WA1ZDV ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Amateur Satellite Frequency Allocations (LF)
Hi Art, Thanks for the reply. --- On Sun, 12/12/10, W4ART Arthur Feller afel...@ieee.org wrote: The general principle is that the amateur-satellite service has frequency allocations in bands where the amateur service has frequency allocations in all three ITU regions. I'm not so sure that's so. The amount of new Amateur Satellite Service spectrum allocated by ITU since the mid 1970's is ZERO but the Amateur Service world-wide has gained spectrum. The only exceptions are in the bands 1260-1270 MHz and 5650-5670 MHz, which are limited to the Earth-to-space direction, and 3400-3410 MHz, which are available in Regions 2 and 3. See RR 5.282. As you say back in the 70's 1260 and 5650 MHz were made Earth to Space only. Does anyone know why this restriction was put in place ? Or even if the reason for this restriction still applies 35 years later ? So, until broadcasters vacate 7100-7200 in Regions 1 and 3, the amateur-satellite service won't have a frequency allocation. Make sense?? No, an Amateur Satellite Service allocation at 7.1-7.2MHz is not on the agenda for the next WRC in 2012 and currently IARU has no plans to ever ask for one! See IARU spectrum requirements at: http://www.iaru.org/ac-09spec.pdf In it's entire history the IARU has not gained any ITU Primary Amateur Satellite allocations in the bands above 146 MHz. We have no Primary allocations above 146MHz until you get to 24GHz. While it is encouraging to see that IARU would like to see Amateur Satellite Service allocations at 50MHz and 3400MHz there are no other proposed Amateur Satellite Service allocations on its agenda. The ARRL is by far the largest financial donor to IARU and so carries the most clout. If ARRL isn't persuaded of the need for additional Amateur Satellite Service allocations they won't happen. 73 Trevor M5AKA ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Amateur Satellite Frequency Allocations (LF)
Plus if it's listening to 135KHz and re transmitting what it hears on 2 or 70cm, it isn't transmitting on 135 so what part is not legal? Joe WB9SBD The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com On 12/12/2010 2:37 PM, Trevor . wrote: IARU has been successfull in obtaining new global Amateur Service allocations such as 135 kHz and 7.1-7.2 kHz, however, the Amateur Satellite Service seems to have been forgotten. 7.0-7.1 is okay for sats but 7.1-7.2 isn't, Why? is the question that has to be asked. Currently IARU is attempting to get an Amateur Service allocation at 500kHz - should they also be getting that band for the Amateur Satellite Service as well ? Given the significant input of the ARRL into IARU perhaps amsat-bb members in NA could remind ARRL that, where possible, new Amateur allocations should be obtained for BOTH the Amateur and Amateur Satellite Services not just the Amateur Service. 73 Trevor M5AKA ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Amateur Satellite Frequency Allocations (LF)
Art..one of the best explanations I have read of the allocations. FB Robert WB5MZO Life member Amsat ARRL From: afel...@ieee.org Date: Sun, 12 Dec 2010 16:18:31 -0500 To: m5...@yahoo.co.uk CC: amsat-bb@amsat.org Subject: [amsat-bb] Re: Amateur Satellite Frequency Allocations (LF) Hi, Tevor! The general principle is that the amateur-satellite service has frequency allocations in bands where the amateur service has frequency allocations in all three ITU regions. The only exceptions are in the bands 1260-1270 MHz and 5650-5670 MHz, which are limited to the Earth-to-space direction, and 3400-3410 MHz, which are available in Regions 2 and 3. See RR 5.282. In Region 2, the band 7100-7200 kHz was reallocated effective 29 MAR 2009. See: RR 5.142. Until 29 March 2009, the use of the band 7100-7300 kHz in Region 2 by the amateur service shall not impose constraints on the broadcasting service intended for use within Region 1 and Region 3. After 29 March 2009 the use of the band 7200-7300 kHz in Region 2 by the amateur service shall not impose constraints on the broadcasting service intended for use within Region 1 and Region 3. RR 5.142. But, this is only in Region 2. So, until broadcasters vacate 7100-7200 in regions 1 and 3, the amateur-satellite service won't have a frequency allocation. Make sense?? 73, art. W4ART Arlington VA On 12-Dec-2010, at 03:37 PM, Trevor . wrote: IARU has been successfull in obtaining new global Amateur Service allocations such as 135 kHz and 7.1-7.2 kHz, however, the Amateur Satellite Service seems to have been forgotten. 7.0-7.1 is okay for sats but 7.1-7.2 isn't, Why? is the question that has to be asked. Currently IARU is attempting to get an Amateur Service allocation at 500kHz - should they also be getting that band for the Amateur Satellite Service as well ? Given the significant input of the ARRL into IARU perhaps amsat-bb members in NA could remind ARRL that, where possible, new Amateur allocations should be obtained for BOTH the Amateur and Amateur Satellite Services not just the Amateur Service. 73 Trevor M5AKA ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb Nullum gratuitum prandium. http://afeller.us ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Amateur Satellite Frequency Allocations (LF)
Hi, Trevor!! On 12-Dec-2010, at 05:06 PM, Trevor . wrote: Hi Art, Thanks for the reply. --- On Sun, 12/12/10, W4ART Arthur Feller afel...@ieee.org wrote: The general principle is that the amateur-satellite service has frequency allocations in bands where the amateur service has frequency allocations in all three ITU regions. I'm not so sure that's so. Indeed it is. If a copy of the RR's isn't on hand, suggest clicking here and read the annex with a table of frequencies allocated to the amateur and amateur-satellite services. The amount of new Amateur Satellite Service spectrum allocated by ITU since the mid 1970's is ZERO but the Amateur Service world-wide has gained spectrum. Actually, major changes were made in conjunction with the 1979 General World Administrative Radio Conference. Many of the current allocations were adopted in the Final Acts of the 1979 GWARC. The only exceptions are in the bands 1260-1270 MHz and 5650-5670 MHz, which are limited to the Earth-to-space direction, and 3400-3410 MHz, which are available in Regions 2 and 3. See RR 5.282. As you say back in the 70's 1260 and 5650 MHz were made Earth to Space only. Does anyone know why this restriction was put in place ? Or even if the reason for this restriction still applies 35 years later ? The footnote was applied in at the 1979 GWARC. I believe the reason is that administrations in Regions 1 and 3 would not agree to the amateur-satellite service in the space-to-Earth direction. So, until broadcasters vacate 7100-7200 in Regions 1 and 3, the amateur-satellite service won't have a frequency allocation. Make sense?? No, an Amateur Satellite Service allocation at 7.1-7.2MHz is not on the agenda for the next WRC in 2012 and currently IARU has no plans to ever ask for one! See IARU spectrum requirements at: http://www.iaru.org/ac-09spec.pdf Exactly. But, no plans to ever ask is a very long time. As explained, until the broadcasting service vacates the band in Regions 1 and 3, the amateur-satellite service likely will not go in there. Given the interference from long distance propagation common at 7100 kHz, it's highly unlikely that the amateur-satellite service will get an allocation in Region 2 until all the broadcasting stations vacate, which cannot happen until some future World Radiocommunication Conference. In it's entire history the IARU has not gained any ITU Primary Amateur Satellite allocations in the bands above 146 MHz. We have no Primary allocations above 146MHz until you get to 24GHz. Also true. But, we have very good sharing arrangements with the radiolocation service in many of these bands. Given the monetary value ascribed to these bands, we probably have a very, very good arrangement, indeed! While it is encouraging to see that IARU would like to see Amateur Satellite Service allocations at 50MHz and 3400MHz there are no other proposed Amateur Satellite Service allocations on its agenda. The ARRL is by far the largest financial donor to IARU and so carries the most clout. If ARRL isn't persuaded of the need for additional Amateur Satellite Service allocations they won't happen. Trevor, there's a huge difference between being persuaded of the need for an allocation and the political, diplomatic, engineering, legal, and financial aspects of making it happen. World radio frequency management is quite difficult and, most assuredly, NOT for the feint of heart. I hope this helps. 73, art. W4ART Arlington VA Everyone is entitled to his own opinion, but not his own facts. - Daniel Patrick Moynihan http://afeller.us ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Dual Yaesu Rigs on SatPC32
Sorry the rigs I am using are the following FT817ND VHF / Ft897D UHF Howard - Original Message - From: Howard Kowall hkow...@shaw.ca To: amsat-bb@amsat.org Sent: Sunday, December 12, 2010 6:54 PM Subject: [amsat-bb] Dual Yaesu Rigs on SatPC32 Hello to all Trying to cal my dual rig control on SatPC32 V12.8a I adjust the receive cat till I hear my voice proper aprox -1.3 kHz on FO29 I reset it to 0 then adjust the cat for transmitter to +1.3kHz I click change/store data file button,then click uplink cal button I restart SatPC32 and try again on FO29 now I am out aprox -2.6khz Anyone else had any Issues,I read the Doppler.sqf file and the math is correct Hmm Thanks all who read and reply Howard VE4ISP ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: LF Satellite ideas?
Bob - I apoligize for the tardinesss of reply to your query. December is a busy time for me with projects finishing and planning for 2011 projects. I would suggest the University of Alaska's work with Red Sprites and Blue Jets. http://elf.gi.alaska.edu/ What are Red Sprites and Blue Jets? Red sprites and blue jets are upper atmospheric optical phenomena associated with thunderstorms that have only recently been documented using low light level television technology. The first images of a sprite were accidently obtained in 1989 (Franz et al. , 1990). Beginning in 1990, about twenty images have been obtained from the space shuttle (Vaughan et al. , 1992; Boeck et al. , 1994). Since then, video sequences of well over a thousand sprites have been captured. These include measurements from the ground ( Lyons, 1994; Winckler, 1995) and from aircraft (Sentman and Wescott, 1993; Sentman et al. , 1995 ). Numerous images have also been obtained from aircraft of blue jets ( Wescott et al. , 1995 ), also a previously unrecorded form of optical activity above thunderstorms. Blue jets appear to emerge directly from the tops of clouds and shoot upward in narrow cones through the stratosphere. Their upward speed has been measured to be about 100 km per second. Anecdotal reports of rocket-like and other optical emissions above thunderstorms go back more than a century (Lyons, 1994), and there have been several pilot reports of similar phenomena (Vaughan and Vonnegut, 1989). Possibly associated gamma ray bursts and TIPPS have also recently reported. Together, these phenomena suggest that thunderstorms exert a much greater influence on the middle and upper atmospheres than was previously suspected. Specific to your VLF capabilities on this satellite .. Look at the 1997 PhD disseration by Steve Cummer submitted to the Department of Electrical Engineering at Stanford University: Lightning and Ionospheric Remote Sensing Using VLF/ELF Radio Atmospherics http://www-star.stanford.edu/~vlf/publications/theses/cummerthesis.pdf at Stanford University: Lightning and Ionospheric Remote Sensing Using VLF/ELF Radio Atmospherics http://www-star.stanford.edu/~vlf/publications/theses/cummerthesis.pdf This research was supported by the Office of Naval Research through grants N00014-93-1-1201 and N00014-95-1-1095, by the Air Force Office of Scientific Research through grant F49620-97-1-0468, and by the Air Force Phillips Laboratory through grant F19628-96-C-0149. That should get you started Bob. Greg w9gb -- Message: 16 Date: Sat, 11 Dec 2010 14:13:33 -0500 (EST) From: Bob Bruninga bruni...@usna.edu Subject: [amsat-bb] LF Satellite ideas? To: amsat-bb@amsat.org Message-ID: 20101211141333.agv57...@msan1.usna.edu Content-Type: text/plain; charset=us-ascii Is 137 KHz possible from space? Our next Cubesat will have a 1100 meter long antenna (think tether satellite). It will ultimatelly be an electrodynamic tether but the first one will have NO ACTIVE ELECTRONICS connected to the tether. So I have asked them to make it 1100m long instead of a generic 1km tether to try to make it resonant in an amateur band. THe path loss at 137 KHz is 60 dB LESS than it is at 2 meters, so it shouldn't take much to communicate with an 1100m long antenna. I'm sorry I didnt think of this sooner, but I need a real SCIENCE justification for this. Maybe LF that low will never punch through the ionosphere, or maybe it will be completely absorbed. Can give good science on this idea? Bob, WB4APR -- Message: 16 Date: Sat, 11 Dec 2010 14:13:33 -0500 (EST) From: Bob Bruninga bruni...@usna.edu Subject: [amsat-bb] LF Satellite ideas? To: amsat-bb@amsat.org Message-ID: 20101211141333.agv57...@msan1.usna.edu Content-Type: text/plain; charset=us-ascii Is 137 KHz possible from space? Our next Cubesat will have a 1100 meter long antenna (think tether satellite). It will ultimatelly be an electrodynamic tether but the first one will have NO ACTIVE ELECTRONICS connected to the tether. So I have asked them to make it 1100m long instead of a generic 1km tether to try to make it resonant in an amateur band. THe path loss at 137 KHz is 60 dB LESS than it is at 2 meters, so it shouldn't take much to communicate with an 1100m long antenna. I'm sorry I didnt think of this sooner, but I need a real SCIENCE justification for this. Maybe LF that low will never punch through the ionosphere, or maybe it will be completely absorbed. Can give good science on this idea? Bob, WB4APR ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: LF Satellite ideas?
Stanford University's VLF Research Group http://vlf.stanford.edu/research The Stanford University VLF Group investigates the Earth's electrical environment, its upper atmosphere, lightning discharges, radiation belts, and the ionized regions of upper atmosphere known as the ionosphere and magnetosphere. Much of our work involves the use of very low frequency (VLF) electromagnetic waves which are generated by lightning discharges, by man-made transmitters and by energetic radiation belt electrons. We investigate the generation of these waves and the manner in which they propagate in and scatter from various regions of the upper atmosphere. We use VLF waves as diagnostic tools to investigate physical processes in the Earth's plasma environment. Under the direction of Professor Umran Inan , the VLF group carries out extensive observational programs at multiple sites around the world and on satellites. In addition, extensive theoretical modeling and interpretation work is carried out, on quantitative modeling of high-altitude optical emissions known as sprites, blue jets, and elves, on modeling the propagation and scattering of electromagnetic waves in the Earth-ionosphere waveguide, and on other related electromagnetic wave and plasma physics problems. VLF Data http://vlf.stanford.edu/vlfdata/ === w9gb - Original Message - From: G. Beat gregory.b...@comcast.net To: amsat-bb@amsat.org Sent: Sunday, December 12, 2010 7:23:44 PM Subject: Re: [amsat-bb] LF Satellite ideas? Specific to your VLF capabilities on this satellite .. Look at the 1997 PhD disseration by Steve Cummer submitted to the Department of Electrical Engineering at Stanford University: Lightning and Ionospheric Remote Sensing Using VLF/ELF Radio Atmospherics http://www-star.stanford.edu/~vlf/publications/theses/cummerthesis.pdf at Stanford University: Lightning and Ionospheric Remote Sensing Using VLF/ELF Radio Atmospherics http://www-star.stanford.edu/~vlf/publications/theses/cummerthesis.pdf This research was supported by the Office of Naval Research through grants N00014-93-1-1201 and N00014-95-1-1095, by the Air Force Office of Scientific Research through grant F49620-97-1-0468, and by the Air Force Phillips Laboratory through grant F19628-96-C-0149. That should get you started Bob. Greg w9gb -- Message: 16 Date: Sat, 11 Dec 2010 14:13:33 -0500 (EST) From: Bob Bruninga bruni...@usna.edu Subject: [amsat-bb] LF Satellite ideas? To: amsat-bb@amsat.org Message-ID: 20101211141333.agv57...@msan1.usna.edu Content-Type: text/plain; charset=us-ascii Is 137 KHz possible from space? Our next Cubesat will have a 1100 meter long antenna (think tether satellite). It will ultimatelly be an electrodynamic tether but the first one will have NO ACTIVE ELECTRONICS connected to the tether. So I have asked them to make it 1100m long instead of a generic 1km tether to try to make it resonant in an amateur band. THe path loss at 137 KHz is 60 dB LESS than it is at 2 meters, so it shouldn't take much to communicate with an 1100m long antenna. I'm sorry I didnt think of this sooner, but I need a real SCIENCE justification for this. Maybe LF that low will never punch through the ionosphere, or maybe it will be completely absorbed. Can give good science on this idea? Bob, WB4APR -- Message: 16 Date: Sat, 11 Dec 2010 14:13:33 -0500 (EST) From: Bob Bruninga bruni...@usna.edu Subject: [amsat-bb] LF Satellite ideas? To: amsat-bb@amsat.org Message-ID: 20101211141333.agv57...@msan1.usna.edu Content-Type: text/plain; charset=us-ascii Is 137 KHz possible from space? Our next Cubesat will have a 1100 meter long antenna (think tether satellite). It will ultimatelly be an electrodynamic tether but the first one will have NO ACTIVE ELECTRONICS connected to the tether. So I have asked them to make it 1100m long instead of a generic 1km tether to try to make it resonant in an amateur band. THe path loss at 137 KHz is 60 dB LESS than it is at 2 meters, so it shouldn't take much to communicate with an 1100m long antenna. I'm sorry I didnt think of this sooner, but I need a real SCIENCE justification for this. Maybe LF that low will never punch through the ionosphere, or maybe it will be completely absorbed. Can give good science on this idea? Bob, WB4APR ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Fwd: Alouette
Begin forwarded message: From: Andrew Squires asqui...@bigpond.net.au Date: 13 December 2010 1:14:50 PM AEDT To: kd...@yahoo.com Subject: Alouette John read with interest you posting on the Amsat board.I used to work for NASA in the 70's and we used to track a satellite called Alouette (spelling?).It was a Canadian satellite and officially listed as a top side sounder.It would listen to the VLF band and the sounds it recorded were amazing,sounds of lighting and the aurora etc.You may be able to find something via google? cheers Andy VK3AS ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: Fwd: Alouette
Well done Alan , you should put your reply up on the BBS I am sure we will weed out a VE who will know the whole story !How were you tied to the Alouette program ? From memory we used to command and record the data from the satellites a few times a day on a regular schedule.I was working at Orroral valley at the time. cheers Andy vk3as On 13/12/2010, at 2:29 PM, Alan Cresswell wrote: Hi, I also had a lot to do with these satellites and may still have the handbooks somewhere but it was a long time ago. The series of satellites was the Alouette/ISIS series (Canadian, 4 satellites) and ISIS-2 had the most sophisticated VLF receiver (And topside sounder) on board. Essentially an audio amplifier attached to an antenna, and there is certainly a lot of interesting “whistlers” etc almost continuously available. Just another option I guess. 73 Alan ZL2BX From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Andrew Squires Sent: Monday, 13 December 2010 02:16 To: amsat-bb@amsat.org Subject: [amsat-bb] Fwd: Alouette Begin forwarded message: From: Andrew Squires asqui...@bigpond.net.au Date: 13 December 2010 1:14:50 PM AEDT To: kd...@yahoo.com Subject: Alouette John read with interest you posting on the Amsat board.I used to work for NASA in the 70's and we used to track a satellite called Alouette (spelling?).It was a Canadian satellite and officially listed as a top side sounder.It would listen to the VLF band and the sounds it recorded were amazing,sounds of lighting and the aurora etc.You may be able to find something via google? cheers Andy VK3AS ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1170 / Virus Database: 426/3311 - Release Date: 12/12/10 ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
