[amsat-bb] Re: AO-7 Mode C? (Or other reason for varying signal strength?)
I also have noticed similar events with AO-7. I try to work into Northern Europe when the opportunity is there. As you mentioned, polarization, obstructions, local noise. I might add just being a bit temperamental at being up there for 35 years! I find it remarkable that we are privileged to have access to such a marvelous bucket of bolts. 73 Bob W7LRD Seattle - Original Message - From: "Bill Dzurilla" To: amsat-bb@amsat.org Sent: Tuesday, April 6, 2010 8:07:38 PM GMT -08:00 US/Canada Pacific Subject: [amsat-bb] Re: AO-7 Mode C? (Or other reason for varying signal strength?) So, folks, does anyone have any thoughts or comments about this issue? 73, Bill NZ5N --- On Sun, 4/4/10, Bill Dzurilla wrote: From: Bill Dzurilla Subject: AO-7 Mode C? (Or other reason for varying signal strength?) To: amsat-bb@amsat.org Date: Sunday, April 4, 2010, 10:52 PM Hi folks, Since starting my effort to work Europe on AO-7, I've found that the very low elevation sigs vary significantly on different passes. Some mornings I can easily hear my downlink and start working Europe at 0.7 degrees elevation, while other days I can't hear myself until 5 degrees elevation, after the window to Europe has closed. Not sure if this is due to band conditions, satellite polarization, obstructions at certain positions, operator error, local noise, or what. Today I spoke with another experienced AO-7 op and he had an interesting theory: on the bad days (when I don't hear my downlink until 5 degress), the sat is in Mode C (lower power). This seems to make sense, because there does not seem to be any middle ground -- I start hearing my downlink at either 0.7 degrees or 5 degrees, never at 2-4 degrees. Anyone have any thoughts on this? Are we able to predict when the sat will be in one mode or another? Or any other explanation for the signal strength variations? 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 ___ 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: seeking examples of frequency bands used in amateur spacecraft
We shouldn't forget that UOSAT 1 (UO-9) carried a set of four phase-related HF beacons at 7 ,14, 21 and 28MHz to provide a tool for HF propagation studies through the ionosphere. 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: AO-7 Mode C? (Or other reason for varying signal strength?)
Bill, from my experience it happens when there are lots of high power signals pulling down the RX. See ya on the bird, Dave, kn4ok -Original Message- From: Bill Dzurilla To: amsat-bb@amsat.org Sent: Tue, Apr 6, 2010 9:07 pm Subject: [amsat-bb] Re: AO-7 Mode C? (Or other reason for varying signal strength?) So, folks, does anyone have any thoughts or comments about this issue? 3, Bill NZ5N --- On Sun, 4/4/10, Bill Dzurilla wrote: From: Bill Dzurilla ubject: AO-7 Mode C? (Or other reason for varying signal strength?) o: amsat-bb@amsat.org ate: Sunday, April 4, 2010, 10:52 PM Hi folks, Since starting my effort to work Europe on AO-7, I've found that the very low levation sigs vary significantly on different asses. Some mornings I can easily hear my downlink and start working urope at 0.7 degrees elevation, while other days I can't hear myself ntil 5 degrees elevation, after the window to Europe has closed. Not ure if this is due to band conditions, satellite polarization, bstructions at certain positions, operator error, local noise, or what. Today I spoke with another experienced AO-7 op and he had an interesting theory: n the bad days (when I don't hear my downlink until 5 degress), the sat is in ode C (lower power). This seems to make sense, because there does not seem to e any middle ground -- I start hearing my downlink at either 0.7 degrees or 5 egrees, never at 2-4 degrees. Anyone have any thoughts on this? Are we able to predict when the sat will be n one mode or another? Or any other explanation for the signal strength ariations? 73, Bill NZ5N __ ent via amsat...@amsat.org. Opinions expressed are those of the author. ot an AMSAT-NA member? Join now to support the amateur satellite program! ubscription 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: AO-7 Mode C? (Or other reason for varying signal strength?)
Bill there is ground reflections that can add 6db of enhancement and objects in the foreground are important considerations. Nick k5qxj -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Bill Dzurilla Sent: Tuesday, April 06, 2010 10:08 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: AO-7 Mode C? (Or other reason for varying signal strength?) So, folks, does anyone have any thoughts or comments about this issue? 73, Bill NZ5N --- On Sun, 4/4/10, Bill Dzurilla wrote: From: Bill Dzurilla Subject: AO-7 Mode C? (Or other reason for varying signal strength?) To: amsat-bb@amsat.org Date: Sunday, April 4, 2010, 10:52 PM Hi folks, Since starting my effort to work Europe on AO-7, I've found that the very low elevation sigs vary significantly on different passes. Some mornings I can easily hear my downlink and start working Europe at 0.7 degrees elevation, while other days I can't hear myself until 5 degrees elevation, after the window to Europe has closed. Not sure if this is due to band conditions, satellite polarization, obstructions at certain positions, operator error, local noise, or what. Today I spoke with another experienced AO-7 op and he had an interesting theory: on the bad days (when I don't hear my downlink until 5 degress), the sat is in Mode C (lower power). This seems to make sense, because there does not seem to be any middle ground -- I start hearing my downlink at either 0.7 degrees or 5 degrees, never at 2-4 degrees. Anyone have any thoughts on this? Are we able to predict when the sat will be in one mode or another? Or any other explanation for the signal strength variations? 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 ___ 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: AO-7 Mode C? (Or other reason for varying signal strength?)
Hi all, On 4/7/10, davekn...@aol.com wrote: > > > Bill, from my experience it happens when there are lots of high power > signals pulling down the RX. > this is the same experience I have. When the bird is over Africa with no stations or max one station calling in the whole passband, I can hear my own signal usually down to 2 degrees elevation and that's with 2 x lindenblad antennas. As soon as two or more stations with high power start uplinking, my little signal disappears. 73 IS0/IZ8DWF ___ 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] Arecibo on 432 MHz Moon Bounce
Hi all: Here is a EME event you cant miss. Dust off your CW key, its time for Satellite, QRP EME. The 1,000 foot dish has 60 dBi on 432 mc and 400 watts. That comes out to be approximately 243,902,443 Million Watts ERP. enjoy wf1f www.marexgm.org (thanks to KB1MGI for passing on this data) Arecibo on 432 MHz Moon Bounce The Arecibo Observatory Amateur Radio Club will be putting the 1000-foot radio telescope on the air for 432 MHz EME from April 16-18. It can be heard with a small hand-held yagi pointed at the moon The scheduled times of operation are: April 16: 1645 - 1930 UTC April 17: 1740 - 2020 UTC April 18: 1840 - 2125 UTC Callsign: KP4AO Tx Frequency: 432.045 MHz Rx Frequency: 432.050 to 432.060+ Tx power: 400 W Antenna gain: 60 dBi System noise temp: 120 K (cold sky) System noise temp: 330 K (when pointed at moon) KP4AO can be heard with a small hand-held yagi pointed at the moon and a good receiver. A 15 dBi antenna and 100 W will be enough to work us on CW. Operators at KP4AO will do their best to work as many stations as possible. Each session will start with a brief announcement and CQ in SSB. SSB QSOs may continue for 30 minutes to an hour, if the QSO rate remains high. The mode will be shifted to CW as soon as it is judged that higher QSO rates would result. We will listen for calls at frequencies 5-15 kHz higher than our own, and even higher if QRM warrants. Callers who s-p-r-e-a-d o-u-t are more likely to be copied. If you've already worked us in any mode, please do not call again -- give others a chance. If we call "CQ QRP", we will listen for stations running 100 W or less to a single yagi. Please do not answer such a CQ if you are running more power or have a larger antenna. On April 18, if we reach a condition where most calling stations have been worked, and we judge that operating in the digital mode JT65B would produce a higher QSO rate, we will switch to JT65B. Note that any of these planned operating strategies may be changed as circumstances dictate. We are extremely fortunate to have been granted access to the world's largest radio telescope for this amateur radio good-will event. We look forward to working as many stations as possible in the alloted time! >From QRZ.COM KB1MGI Moon-Net Email reflector http://list- serv.davidv. net/mailman/ ...erv.davidv. net Moon Bounce information http://www.vhfdx. info/eme. html UK Ham makes EME contact with just 25 watts http://www.southgat earc.org/ news/jan. ..me_contact. htm Earth-Moon-Earth with 20 Watts http://www.southgat earc.org/ news/jan. ..h_20_watts. htm WSJT Software for EME http://www.physics. princeton. edu/pulsar/ K1JT/ ___ 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] SO-50 demo planned for Thursday
Hello all, I will be holding a presentation and SO-50 demo tomorrow Thursday, April 8th for a gifted class at Sleepy Hill Elementary School in Lakeland, FL. I understand that out of 52 students, 12 hold their technician licenses and about 12 more will take their test shortly. I would like to invite anyone who can, to join us for the 15:26 UTC (11:26 ET) pass as max. elevation will only be 9 deg. and this is my only opportunity for a pass due to class times. See you on the bird, Dave, AA4KN an AMSAT area coordinator for Central Florida ARISS Team member LMARS member ___ 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: [digitalradio] Dayton SDR forum speakers sought
Hi Bob, Will your presentation be available via YouTube or similar? I'm unable to attend this year due to gardening requirements (85 year-old mother dictated this), I would very much like to view the SDR presentations. If homeland security let me come over in 2011 I'll contact you. Simon Brown, HB9DRV http://sdr-radio.com From: digitalra...@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of Robert McGwier Let me know if you are interested in making a presentation. ___ 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] Dayton SDR forum speakers sought
On Friday, May 14, I am the moderator (and speaker) at the SDR forum at the 2:30 PM - 5 PM session. I have two speakers (Scotty on openhpsdr, and I speak on general SDR topics). I need to fill out this time and this leaves at least 1.5 hours to fill. I would like to get this settled as soon as possible. Let me know if you are interested in making a presentation. Also, FYI, I will be the AMSAT/TAPR banquet speaker on Friday night. In addition to my forum, SDR, paper delivery with Joel Harrison, work in Flex booth, etc. this will be one of the busiest Dayton's for me in years. I look forward to seeing many of you. Bob McGwier N4HY ___ 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] Heil Headset Thank's
I would like to thank all that contacted me, from all the good advice I have now ordered the proper adapters, they should be hereby the end of his week. Again thanks to all. DaveVA7DG ___ 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] Dayton Rooms
Again a friendly reminder that the cutoff date for the AMSAT block of rooms in Dayton is April 13th. If you are planning to stay with us, please call me at 301-589-6062 to make your reservation. I will need a credit card number to hold the room. -- 73- Martha ___ 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] KC0YBM - Chris please contact me
Chris (KC0YBM), If you read the BB please contact me at ³kb8zgl at kb8zgl.net² as your email is not listed on your QRZ page and I haven¹t found it through any other ham websites or searches on Google. Thanks, sorry for the bandwidth all, Mike kb8zgl ___ 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: KC0YBM - Chris please contact me
QRZ says kb8...@miaprs.net On 07-Apr-10 18:49, Michael Wolthuis wrote: > Chris (KC0YBM), > > If you read the BB please contact me at �kb8zgl at kb8zgl.net� as your email > is not listed on your QRZ page and I haven�t found it through any other ham > websites or searches on Google. > ___ 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] Yaesu FT-530
Please help me remember how the FT-530 is used for "full duplex" FM sat ops. Correct me, and add to this list - THANK YOU! - You must use an earpiece (or a headset) so that the RX audio isn't passed - There is a keystroke sequence to enable either the LEFT side or the RIGHT side to be the EARPHONE - what is it? - Then a press of the PTT "locks in" that audio choice setting, right? I must be gettin' old ... I *used* to remember this stuff. Clint Bradford, K6LCS ___ 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] Subject: Re: AO-7 Mode C? (Or other reason for varying signal strength?)
It seems to me (presumptuous since my only satellite activity is reading the group!) that most of the responses suggest causes that would not be so sharply defined as Bill's observations. He says Either 0.7 degrees OR 4-5 degrees not a continuum of values. I would have to ask if there is any correlation with day of week, local weather conditions (also a continuum of values) or AO-7 mode immediately prior to the mode it is in when the observations are made (IIRC the mode can switch at random). Can a correlation be made between the elevation at AOS and the signal level at nearest approach? 73 Pete K5GM AMSAT LM. Pete Jordahl, K5GM k...@amsat.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] Lithium-Air Batteries Promising
Lithium-air battery technology looks to have a big future. With the potential of providing energy densities up to three times that of the conventional lithium-ion batteries found in just about every portable consumer electronics device going around (not to mention the incoming wave of electric vehicles), many companies, including IBM and General Motors are pursuing work on lithium-air batteries. Now researchers at MIT have made a breakthrough that could help make the commercial development of lightweight rechargeable batteries a reality. Entire article: http://tinyurl.com/li-air Clint Bradford, K6LCS ___ 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: [Flexradio] [digitalradio] Dayton SDR forum speakers sought
Gary Pearce, KN4AQ recorded the forums last year and made some nice DVDs of the SDR forums at Dayton last year. I saw him at Raleigh and he is planning to do the same this year. http://www.arvideonews.com/ -Tim -Original Message- From: flexradio-boun...@flex-radio.biz [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Simon HB9DRV Sent: Wednesday, April 07, 2010 1:08 PM To: digitalra...@yahoogroups.com; 'open_high_performance_...@yahoogroups. com' Cc: 'dttsp-linux'; 'GNURadio Discussion List'; 'amsat bb'; q...@yahoogroups.com; 'FlexRadio'; 'flexedge' Subject: Re: [Flexradio] [digitalradio] Dayton SDR forum speakers sought Hi Bob, Will your presentation be available via YouTube or similar? I'm unable to attend this year due to gardening requirements (85 year-old mother dictated this), I would very much like to view the SDR presentations. If homeland security let me come over in 2011 I'll contact you. Simon Brown, HB9DRV http://sdr-radio.com From: digitalra...@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On Behalf Of Robert McGwier Let me know if you are interested in making a presentation. ___ FlexRadio Systems Mailing List flexra...@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/ ___ 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] AO-51 down?
Hi All, Nobody heard the bird in the Memphis area on either pair for the 2226 utc pass. Software crash? Good luck control team, Rick WA4NVM ___ 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] HO-68 orbits
I've been away from the birds for a while, and when I checked the HO-68 schedule for this week, there appeared to be no times available with East Coast/Europe openings. If that's correct, is that the usual case or a fluke? I'm sure someone has asked the control ops abt. it. Tnx and 73, Tony, N2UN ___ 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: Lithium-Air Batteries Promising
On 7 Apr 2010 at 13:36, Clint Bradford wrote: Date sent: Wed, 07 Apr 2010 13:36:03 -0700 From: Clint Bradford Subject:[amsat-bb] Lithium-Air Batteries Promising To: AMSAT BB > Lithium-air battery technology looks to have a big future. With the potential > of providing energy densities up to three times that of the conventional > lithium-ion batteries found in just about every portable consumer electronics > device going around (not to mention the incoming wave of electric vehicles), > many companies, including IBM and General Motors are pursuing work on > lithium-air batteries. Now researchers at MIT have made a breakthrough that > could help make the commercial development of lightweight rechargeable > batteries a reality. > > Entire article: http://tinyurl.com/li-air > > Clint Bradford, K6LCS Interesting but this part is troubling me a bit for a space usage "and the fact that oxygen is freely available in the environment and doesn´t need to be stored in the battery."! "-" Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe DSTAR urcall VE2DWE WAC BASIC CW PHONE SATELLITE ___ 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
