[amsat-bb] 1973-05-14: Launch of Skylab 1
http://www-pao.ksc.nasa.gov/kscpao/history/skylab/skylab-1.htm 73s Bernhard VA6BMJ @ CO96NG ___ Sent via AMSAT-BB@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: ISS ham TV
ditto W7LRD - Original Message - From: "Robert C. Campbell" To: amsat-bb@amsat.org Sent: Tuesday, May 14, 2013 4:23:21 PM Subject: [amsat-bb] ISS ham TV I am so confused. Is anyone going to make up a paper, ISS HamTV for dummies? I would like to work on this project but there does not at this time seem to be an easy shopping list, with connect tab a to slot a. I would hope there is something more clear in time to get a build done and ready by July. A mobile tv manager that runs the sports circuits for US tv networks says we will be waiting for our European hams on this one. Even the Tutionne web site confuses me. ___ Sent via AMSAT-BB@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-BB@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: ISS HamTV Frequencies
I would like to know how often this is even going to be in operation before I make myself crazy trying to piece something together. Dave-KB1PVH Sent from my Verizon Wireless Droid RAZR ___ Sent via AMSAT-BB@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] ISS ham TV
I am so confused. Is anyone going to make up a paper, ISS HamTV for dummies? I would like to work on this project but there does not at this time seem to be an easy shopping list, with connect tab a to slot a. I would hope there is something more clear in time to get a build done and ready by July. A mobile tv manager that runs the sports circuits for US tv networks says we will be waiting for our European hams on this one. Even the Tutionne web site confuses me. ___ Sent via AMSAT-BB@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: adjusting for Doppler
See The One True Rule for Doppler Tuning http://www.amsat.org/amsat/features/one_true_rule.html 73 Trevor M5AKA --- On Tue, 14/5/13, Rolf Krogstad wrote: > From: Rolf Krogstad > Subject: [amsat-bb] adjusting for Doppler > To: amsat-bb@amsat.org > Date: Tuesday, 14 May, 2013, 20:47 > I am sure this has been hashed over > in the past but as a novice to the > birds I am not sure how to proceed when operating one of the > linear > transpondesr. > > I looked at the latest editions of two ARRL publications: > ARRL Operators Manual, edition 9, copyright 1007-2011 > ARRL Satellite Handbook, copyright 2010 > > Both are very clear about how one should allow for Doppler > shift on the > linear transponders. > > One clearly says find your spot and then use the downlink > VFO to adjust for > Doppler shift, don't touch the uplink VFO after the initial > setting of the > frequency. > > The other clearly says find your spot and then use the > uplink VFO to adjust > for Doppler shift, don't touch the downlink VFO after the > initial setting > of the frequency. > > Color me confused... > > Rolf NR0T > Amsat #38889 > EN34 > ___ > Sent via AMSAT-BB@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-BB@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: adjusting for Doppler
Read this: http://www.amsat.org/amsat/features/one_true_rule.html It explains all you've heard, and more. 73, Jim KQ6EA On 05/14/2013 07:47 PM, Rolf Krogstad wrote: I am sure this has been hashed over in the past but as a novice to the birds I am not sure how to proceed when operating one of the linear transpondesr. I looked at the latest editions of two ARRL publications: ARRL Operators Manual, edition 9, copyright 1007-2011 ARRL Satellite Handbook, copyright 2010 Both are very clear about how one should allow for Doppler shift on the linear transponders. One clearly says find your spot and then use the downlink VFO to adjust for Doppler shift, don't touch the uplink VFO after the initial setting of the frequency. The other clearly says find your spot and then use the uplink VFO to adjust for Doppler shift, don't touch the downlink VFO after the initial setting of the frequency. Color me confused... Rolf NR0T Amsat #38889 EN34 ___ Sent via AMSAT-BB@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-BB@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] adjusting for Doppler
I am sure this has been hashed over in the past but as a novice to the birds I am not sure how to proceed when operating one of the linear transpondesr. I looked at the latest editions of two ARRL publications: ARRL Operators Manual, edition 9, copyright 1007-2011 ARRL Satellite Handbook, copyright 2010 Both are very clear about how one should allow for Doppler shift on the linear transponders. One clearly says find your spot and then use the downlink VFO to adjust for Doppler shift, don't touch the uplink VFO after the initial setting of the frequency. The other clearly says find your spot and then use the uplink VFO to adjust for Doppler shift, don't touch the downlink VFO after the initial setting of the frequency. Color me confused... Rolf NR0T Amsat #38889 EN34 ___ Sent via AMSAT-BB@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: Helical Antenna on 70 cm
A good source of antennas and antenna advice is Dave W6OAL http://www.hamtv.com/oal.html He likes Loop yagis for 23cm -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Rolf Krogstad Sent: Monday, May 13, 2013 10:23 AM To: amsat-bb@amsat.org Subject: [amsat-bb] Helical Antenna on 70 cm I am new to satellites and new to the design requirements for UHF and am looking for advice. I am looking to build a Helical antenna for the 70cm Band. I am considering the plans for such an antenna from the 2010 edition of the ARRL Satellite Handbook. The plans call for a 235 cm (7' 8") long, 2.5 cm (1") diameter center support made of either a wooden dowel which has been treated or a fiberglass tube. It also requires multiple 7.6 cm (3") spacers for the helical element. My question is would fiberglass rods made of "Isophthlic Polyester Resin" be a good choice of material at UHF frequencies? I hesitate to use treated wood because I plan to mount this on the top of a 15 meter high tower and it isn't very accessible. Thanks Rolf NR0T [EN34] ___ Sent via AMSAT-BB@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-BB@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] ANS-134 ANS Special Bulletin - NASA Announces Fox-1 Launch Date
AMSAT NEWS SERVICE SPECIAL BULLETIN ANS-134 SB SAT @ AMSAT $ANS-134.01 ANS-134 ANS Special Bulletin - NASA Announces Fox-1 Launch Date AMSAT News Service Bulletin 134.01 >From AMSAT HQ SILVER SPRING, MD. May 14, 2013 To All RADIO AMATEURS BID: $ANS-134.01 NASA announced Monday that AMSAT's Fox-1 spacecraft has been assigned for launch in 2014. For details on the launch vehicle, targeted launch date, orbit specifics, and more, please attend the AMSAT Forum or visit the AMSAT booth at the Dayton Hamven- tion this weekend. Watch http://www.amsat.org and the AMSAT News Service for more details to follow. [ANS thanks AMSAT Vioe President Engineeing Tony Monteiro, AA2TX for the above information] /EX ___ Sent via AMSAT-BB@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: ISS HamTV Frequencies
This looks very interesting, wondering if it would be possible to tweak the tuners in DVB-S reveivers so no conversion would be needed? >From http://amsat-uk.org/ :- It is planned to transmit DVB-S signals on 2.4GHz at either 1.3Msps or 2.3Msps with 10 watts of RF from the ISS Columbus module. The IARU Amateur Satellite Frequency Coordination Panel have announced frequencies of 2422.0 MHz and 2437.0 MHz. Most of these receivers use 'L-Band' and can do 950Mhz to around 2Ghz - would be great if we could tweak this, or perhaps inject the 2.4ghz signal after the internal tuning stage, with a bit of buffering /amplification ?? :) Looking at this:- http://www.tbsdtv.com/products/tbs8920-dvb-s2-tv-tuner-pci-card.html or this:- http://www.proftuners.com/review_prof_7301.html - Just as a quick search - it looks like we could use these type of devices for 'decoding' the DVB stream, rather than going for the physical 'lump' and extra expense of a set-top box. Matty MD0MAN Date: Mon, 13 May 2013 21:33:13 +0100 (BST) From: M5AKA To: Daniel Schultz , amsat-bb@amsat.org, Greg Dolkas Subject: [amsat-bb] Re: ISS HamTV Frequencies Message-ID: <1368477193.60216.yahoomailclas...@web172303.mail.ir2.yahoo.com> Content-Type: text/plain; charset=iso-8859-1 --- On Mon, 13/5/13, Greg Dolkas wrote: > Is there something about the DVB-S modulation that makes it > astoundingly better for this application?? For > something that is intended to be widely received, they sure > are making it difficult... DVB-S receivers are in use in hundreds of millions of homes around the world. Apart from DVB-S2, which is not yet so widespread, I'm not aware of any other standard that would deliver better performance in a 2 MHz bandwidth. 73 Trevor M5AKA ___ Sent via AMSAT-BB@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] Up-tilted beams (15 degree optimum)
Did you look at the antenna plot on that web page?: http://aprs.org/rotator1.html At the proper 15 degree tilt of a fixed beam, the gain is down only 1 dB at the horizon. At your proposed 35 degree tilt, the gain is down 4 dB on the horizon where you need it most (70% of all pass times are below 22 degrees). To me, it makes no sense to sacrifice 4 dB in the area where the satellites spend most of their time. The only benefit to the high tilt angle is improved performance during the 3% of the time the satellite is above 60 degrees. And is that worth giving up gain for the 70% of all other pass times? Further, when the satellite is that high the signal is already 6 to 10 dB stronger than it was on the horizon anyway. How much better does one need to hear an already excellent signal? (so as to sacrifice the other 70%)? But again, if the antenna is in a hole and cannot see anywhere close to the horizon anyway, then of course, tilt the main beam up to point right at the lowest available horizon where the gain is needed most. Bob, WB4aPR > Bob, depending on the antenna pattern and the ground, as you say, > 15 degrees might be too low for any additional help toward the horizon. > 30 to 35 degrees will give you a little better results for stuff that isn't just > right at the horizon, I feel. As with all things in this hobby, experimentation > with your equipment will allow you to find the best combination. Also why sacrifice 3 dB for all terrestrial operations too which are also on the horizon? On 5/13/2013 11:29 AM, Robert Bruninga wrote: >> As has been said many times, most satellite passes are never >> "directly overhead", but rather on some inclination across the sky. >> A 5 element yagi antenna, at a 35 degree angle from the horizon, >> with only an asmuth rotator, will let you work far more satellites >> for > the money spent. > > Except that the correct angle is 15 degrees not 30 or 35.At 15 > degrees, the main gain lobe of the antenna still has excellent gain on > the horizon where you need it most and an equal gain all the way up to 30 > degrees or so. Below 30 degrees is where satellites spend 80+% of their > in-view times. This is where you need the gain most. But when the > satellite is above 30 degrees, the satellite is at least 6 to 10 dB > closer and so it makes no sense to sacrifice gain on the horizon > (where you need it most) by placing it at 30 degrees where you need it least. > > See http://aprs.org/rotator1.html > > Ignore the topic of the page but look very carefullyl at the SCALE > drawing (Yes, that is drawn to scale) of a LEO satellite pass Notice > how 95% of all satellite access times are below 50 degrees and 70% of > the time they are below 22 degrees. That is where you need the gain. > Do not waste it by tilting the antenna up more than 15 degrees. > > The only exception is that if your beam antenna cannot see the horizon > anyway, then, yes, tilt it up a little more since you wont hear the > low stuff anyway... > > Bob, WB4aPR > > > > Gregg Wonderly > > On 5/12/2013 12:48 PM, Jeff Moore wrote: >> I wouldn't recommend a J-pole for satellite work unless you expect to >> only work sats on the horizon. The J-Pole antenna has a low take-off >> angle and almost NO radiation overhead, an plain 1/4 wave ground >> plane antenna would work better for the sats. >> >> >> >> J-poles are great terrestrial communications antennas, not so much >> for working overhead satellite passes. An Eggbeater or quadrifiliar >> antenna would be a better choice. >> >> 7 3 >> >> Jeff Moore -- KE7ACY >> >> On 5/12/2013 8:00 AM, Werner, HB9BNK wrote >>> Thank you all for your valuable hints and advices ! >>> >>> I will now build such an antenna and then supply here the results. >>> >>> 73 Werner, HB9BNK >> >> ___ >> Sent via AMSAT-BB@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-BB@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-BB@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-BB@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: ISS HamTV Frequencies
Hi all There is a DATV forum on the BATC website and there is also a DATV forum on yahoo groups. There is already plenty of DVB-S ATV activity in Europe, the US and Australia. The low symbol rate planned for the ISS activities cuts down the choice for available decoders but known to work are the Technotrend TT-budget S2-1600 and 3200 cards. They are available on the web from various suppliers. Hope this helps 73 Graham G3VZV -Original Message- From: Peter Guelzow Sent: Tuesday, May 14, 2013 7:28 AM To: amsat-bb@AMSAT.Org Subject: [amsat-bb] Re: ISS HamTV Frequencies Hi Dan, the DVB Encoder and Modulator comes from http://sr-systems.de/content.php?show=Startseite&lng=eng&style=std The developers are hams and this stuff is available and used for D-ATV in Germany since several years. 73s Peter DB2OS On 14.05.2013 05:03, Daniel Schultz wrote: I would research the matter carefully before buying any equipment, does anyone in the ISS HamTV group have any data on which DVB-S receivers will work? This is pretty much beyond what the gear was designed for! Dan Schultz N8FGV -- Original Message -- Received: Mon, 13 May 2013 10:52:22 PM EDT From: Greg D To: M5AKA Cc: Daniel Schultz , amsat-bb@amsat.org Subject: Re: [amsat-bb] Re: ISS HamTV Frequencies 2 mhz? Yeah, that would be tough... Ok, DVB-S it is. Thanks all for the education. There's a swap meet coming up in a couple of weeks... Sounds like I have a now have a mission. :-) Greg KO6TH ___ Sent via AMSAT-BB@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-BB@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-BB@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] ISS - HAMTV - Tutionne Software for DATV
Daniel the software I mentioned can be downloaded here: http://www.vivadatv.org/viewtopic.php?f=60&t=63 Emanuele I0ELE ___ Sent via AMSAT-BB@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: ISS HamTV Frequencies
Hi Dan, we have tested two alternatives: one is a decoder on a PC Card and the other one is a commercial set top box. The PC Card that we tested is Technotrend S2-3200 (around €60,00) and you can also use a very powerful software TUTIONNE (free) developed by Jean Pierre F6DZP. There is also a cheaper version, which F6DZP tested, which is Technotrend S2-1600. Check that your PC can host a standard PCI card. The set top box that we tested is Megasat 400 (around €40/50) but most of commercial set top boxes are specified to work from 1 to 45 MSym/s. Remember that HAMTV can transmit a 1.3 MSym/s or a 2.0 MSym/s stream. Emanuele I0ELE Il 14/05/2013 5.03, Daniel Schultz ha scritto: I would research the matter carefully before buying any equipment, does anyone in the ISS HamTV group have any data on which DVB-S receivers will work? This is pretty much beyond what the gear was designed for! Dan Schultz N8FGV -- Original Message -- Received: Mon, 13 May 2013 10:52:22 PM EDT From: Greg D To: M5AKA Cc: Daniel Schultz , amsat-bb@amsat.org Subject: Re: [amsat-bb] Re: ISS HamTV Frequencies 2 mhz? Yeah, that would be tough... Ok, DVB-S it is. Thanks all for the education. There's a swap meet coming up in a couple of weeks... Sounds like I have a now have a mission. :-) Greg KO6TH ___ Sent via AMSAT-BB@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-BB@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
