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CX2SA > SATDIG 17.06.13 21:02l 780 Lines 27969 Bytes #999 (0) @ WW
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Today's Topics:
1. AO7 in Mode B (K4FEG)
2. ANS-167 AMSAT News Service Weekly Bulletins (E.Mike McCardel)
3. Re: AO7-b MODE?? (Jim Jerzycke)
4. Re: AO7-b MODE?? (WA6FWF)
5. Re: psk-1 tnc-nb96 question (Mark L. Hammond)
6. Fitri Rahmawati (Fitri Rahmawati)
7. For sale-moving (James Sanford)
8. iridium comms in space (Howie DeFelice)
----------------------------------------------------------------------
Message: 1
Date: Sun, 16 Jun 2013 14:43:14 -0500
From: K4FEG <K4FEG@xxxxx.xxx>
To: starcom-bb@xxxxxxxx.xxxx amsat-bb@xxxxx.xxx
Subject: [amsat-bb] AO7 in Mode B
Message-ID: <51BE1552.90506@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Thanks everyone!!
Thanks everyone for the reports on AO7 and it being in Mode B.
I think it should be in Mode B for a few more weeks so Field Day should
have it in Mode B the entire duration of Field Day.
We are in the middle of the Eclipse Cycle, by all standard means of
calculating, we (the Earth), are near the furthest distance from the Sun
and the Southern Hemisphere is quickly approaching their "Winter"
Equinox (shortest daylight period of the year), so this would be the
time when AO7 would have the least amount of exposure to the Sun during
passes over Antarctica. I know there are programs that will tell you
when a satellite is "in the Sun" or not and SATPC32 seems to do a better
than average job of predicting when an eclipse period is occurring.
There have been questions as to whether or not a program like SATPC32 is
calculating the solar position based on ground track or actual satellite
position in orbit, I have not reached out to find out the method of
calculations but based on how AO7 has reacted to even the briefest of
eclipse's as predicted by SATPC32, I suspect the relationship of the
satellite to the Sun is being predicted based on the actual satellite
position in orbit and not based on ground track. When AO7 first started
its "Zero Voltage Reset" and ceased switching modes back on May 21st,
the eclipse period that triggered the reset was only estimated to be
about 15 to 20 seconds. Reports that I have received from an operator in
New Zealand, who has access to the satellite at times when it is heading
into eclipse and coming out of eclipse, has stated that the satellite
merely "fades" out and then "fades" back in when it comes out of the
eclipse. Based on research about the construction of AO7, it has a
better than needed solar array, from that era in which it was designed
and built, and appears to suffer no ill effects from the "fading
voltage" as the satellite loses the sunlight.
If the Eclipse Cycle holds true to the predictions and continues to
react as we have see it do so for the last almost 4 weeks, it should
continue to do what I am calling "Zero Voltage Reset" until it is in
continuous Sun over Antarctica, which will not occur for several more weeks.
This is one of the reasons I have been studying the reactions of AO7
during this period, the way the satellite was designed gave an outline
of how it should react coming out of eclipse, with no on-board battery
system, but to my knowledge there has not been a case study, trying to
accurately track how the satellite will react. I am just trying to
collect data that will help in trying to predict how the satellite may
react when the next Eclipse Cycle occurs. Perhaps during future eclipse
events we can have a much more scientific study of the "Grand Old Lady"
of satellites, AO7.
If nothing else I think we can learn much from the how this satellite
was built and has been "reborn" to help serve the satellite community!
My hat is off to the design team for building one tough bird! Job Well Done!
Thank you everyone who sends me email updates about their observations.
I hope I am not boring people with my current obsession of AO7, but I
like the old bird!
73 ALL FRM,
K4FEG
STARCOM DIV
GGHQ: EM55aj84ta
------------------------------
Message: 2
Date: Sun, 16 Jun 2013 17:14:54 -0400
From: "E.Mike McCardel" <mccardelm@xxxxx.xxx>
To: Amsat - BBs <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] ANS-167 AMSAT News Service Weekly Bulletins
Message-ID:
<CAM5+sot0HeiCGEbVSKJ0+CoK_=WYRCTzZzFaJN9Lx35raT3TJg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
AMSAT NEWS SERVICE
ANS-167
The AMSAT News Service bulletins are a free, weekly news and infor-
mation service of AMSAT North America, The Radio Amateur Satellite
Corporation. ANS publishes news related to Amateur Radio in Space
including reports on the activities of a worldwide group of Amateur
Radio operators who share an active interest in designing, building,
launching and communicating through analog and digital Amateur Radio
satellites.
The news feed on http://www.amsat.org publishes news of Amateur
Radio in Space as soon as our volunteers can post it.
Please send any amateur satellite news or reports to:
ans-editor at amsat.org.
In this edition:
* HAM Video for the ISS Announced by ARISS
* AMSAT Videos from Dayton Hamvention
* AMSAT Area Coordinator Kevin Smith, N3HKQ, now SK
* RECENT AMSAT AWARDS
* Fox-2 MPPT Team Selected In TI Design Contest
* AMSAT Field Day 2013 - One More Time
* Wilse Morgan WX7P (ex-KL7CQ) SK
* ARISS News
* Satellite Shorts From All Over
SB SAT @ AMSAT $ANS-167.01
ANS-167 AMSAT News Service Weekly Bulletins
AMSAT News Service Bulletin 167.01
>From AMSAT HQ SILVER SPRING, MD.
DATE June 16, 2013
To All RADIO AMATEURS
BID: $ANS-167.01
HAM Video for the ISS Announced by ARISS
ARISS-Europe Chairman Gaston Bertels, ON4WF has drafted an overview
of a new "Ham Video" DATV downlink
system on S-Band being developed for placement on the International
Space Station later this year.
The equipment is being developed by Kayser Italia under contract
with the European Space Agency using
a Canon XF-305 camera provided by NASA. The equipment is currently
slated for deployment to the ISS on
Japan Space Agency's HTV-4 in August 2013. HTV is Japan's H-II
Transfer Vehicle for resupplying the
International Space Station.
Gaston's paper provides an overview of both the equipment that is
being placed on the ISS as well as
discusses ground station requirements. The ESA contract calls for
Kayser Italia to provide five
ground stations for placement in Europe that will be "chained" to
provide overlapping video reception
coverage, with the British Amateur Television Club (BATC) serving as
a central server site for
receiving video from these ground stations and making it freely
available to others via the internet.
It is hoped that amateurs will support other ground station "chains"
in other countries as multiple
stations are needed to provide up to 15 minutes of video in support
of school contacts.
Gaston's paper with block diagram and photographs of key components
will be available soon on the
AMSAT website (www.amsat.org).
[ANS thanks ANS thanks Gaston Bartels, ON4WF for this information
for the above information]
---------------------------------------------------------------------
AMSAT Videos from Dayton Hamvention
A series of videos taken during the AMSAT Forum during The Dayton
Hamvention have been released.
+ AMSAT ARISS Program Status, by Frank KA3HDO - 2013 Dayton Hamvention
http://www.youtube.com/watch?v=Hju20svHK5k
+ AMSAT Education and You, by Mark N8MH - 2013 Dayton Hamvention
http://www.youtube.com/watch?v=eXzCRiNaTXw&feature=youtu.be
+ AMSAT Status Report, by Barry WD4ASW - 2013 Dayton Hamvention
http://www.youtube.com/watch?v=hGj5_wjomzI&feature=youtu.be
+ FUNcube Satellites, by Howard G6LVB - 2013 Dayton Hamvention
http://www.youtube.com/watch?v=9NSD39MNKe0&feature=youtu.be
+ Fox Classroom Experiments, by Spence WA8SME - 2013 Dayton Hamvent
http://www.youtube.com/watch?v=kl8HCBEGv4Q
+ Fox-1 Status Update, by Tony AA2TX - 2013 Dayton Hamvention
http://www.youtube.com/watch?v=Gub5182mowg
You can view these videos, collectively, and lots of other AMSAT
video content by going to:
www.amsat.org and click on "AMSAT YOUTUBE CHANNEL"
or by going to www.youtube.com/AMSATNA
[ANS thanks AMSAT Steve N9IPand Andrew KO4MA,for the above
information]
---------------------------------------------------------------------
AMSAT Area Coordinator Kevin Smith, N3HKQ, now SK
Kevin Smith, N3HKQ, age 59, passed away suddenly Monday night, 10
June. He had successfully battled a blood disorder for several
years, but was stricken Monday morning.
Kevin was an AMSAT Area Coordinator for many years and co-chaired
the team that hosted the 2007 AMSAT Symposium in Pittsburgh, PA.
Prior to that, he was a key player in executing an ARISS contact from
Upper St. Clair (PA) High School. An enthusiastic member of the
Wireless Association of the South Hills (WASH) local club, Kevin was
always upbeat and positive, and looked forward to the satellite
contacts at Field Day, even after the loss of AO-13 and AO-40, and to
VHF/UHF operating. He worked hard at the easy contacts, developing
ingenious lightweight hand-held antennas and means of controlling two
radios to make it all work for the one satellite contact. He moved
on to the microwaves, building a 10 GHz kit when he could have bought
the completed DownEast Microwave transverter, and was working on one
of the W1GHZ transverters for 2.4 GHz. A few weekends ago, several
WASH members did some work on his VHF/UHF antennas, and Kevin was
looking forward to the VHF contest this past weekend. `He is known
to have made at least one 2-meter QSO.
Kevin is survived by his wife Peg, married son, Michael, and married
daughter, Jen. His obituary may be found at,
http://obituaries.triblive.com/listing/226203/Kevin-Smith/
In lieu of flowers, Kevin's family suggests memorial donations be
made to the Leukemia and Lymphoma Society, the MDS Foundation, or to
Be the Match.
[ANS thanks Jim Sanford, WB4GCS for the above information.]
---------------------------------------------------------------------
RECENT AMSAT AWARDS
Here is our latest induction into some of the AMSAT awards
community. There is a pretty good batch since the last report in
April.
The following have entered into the Satellite Communicators Club for
making their first satellite QSO.
Jim Whitfield, K5JAW
The following have earned the AMSAT Communications Achievement Award.
Alessio Vacondio, IK4IDY, #555
The following have earned the South Africa Satellite Communications
Achievement Award.
Joseph Fouquet, N5JF, #US185
The following have earned the AMSAT Sexagesimal Award.
George Carr, WA5KBH, #163
Zeljko Ulip, 9A2EY, #164
Alessio Vacondio, IK4IDY, #165
The following have earned the AMSAT W4AMI Award.
Alessio Vacondio, IK4IDY, #80
The following have earned the AMSAT W4AMI 5000 Award.
Doug Papay, KD8CAO, #30
[ANS thanks Bruce, KK5DO, for the above information]
---------------------------------------------------------------------
Fox-2 MPPT Team Selected In TI Design Contest
AMSAT sponsored a senior design project at the Rochester Institute
of Technology this academic year.
The students included senior EE majors:
Bryce Salmi KB1LQC
Brent Salmi KB1LQD
Ian MacKenzie KB3OCF
and Dan Corriero.
The project was to develop an MPPT circuit that could be used on a
future Fox-2 (3U) CubeSat. The students completed a working prototype
which was on display in our engineering booth at Dayton last month.
With my agreement and encouragement, the students entered this
project into Texas Instruments' 2013 Analog Design Contest for
university students.
See: http://tinyurl.com/mf6nzhr
I am happy to pass along the great news that the AMSAT MPPT project
was selected as one of the top 10 semi-finalists and the students
were invited on an all-expenses paid trip to TI's contest summit to
be held July 21-23 in Dallas where the final winners will be
announced.
Congratulations to the Fox-2 MPPT team!
[ANS thanks Tony AA2TX for the above information]
---------------------------------------------------------------------
AMSAT Dayton Volunteers Thanked / Asked for Feedback
First and most important, I want to thank each of you for your
assistance at the 2013 Dayton Hamvention.
I'm thrilled with our presence at Dayton this year. In my opinion,
it went well because of the efforts of the 40+ volunteers who
assisted in so many different ways. You made a difference.
As I'm wrapping up my Dayton notes, I'm looking for suggestions.
How can AMSAT make our presence next year at Dayton more effective?
Was there anything we did that made things more difficult for the
hams who stopped at the booth?
What can we do to attract more potential members and communicate the
excitement we feel about building, launching, and operating
satellites?
Thanks again for all of your help. It was truly a privilege working
with you!
73,Steve N9IP
Contact Dave with your feedback - seb at wintek dot com
[ANS thanks Steve N9IP for the above information]
---------------------------------------------------------------------
AMSAT Field Day 2013 - One More Time
Every year AMSAT promotes a satellite version of Field Day during
the ARRL annual operating event which is held on the 4^th weekend in
June. This year Field Day will take place from 1800 UTC on Saturday
June 22, 2013 through 2100 UTC on Sunday June 23, 2013.
SaudiSat-Oscar-50 will be the only operational FM transponder
satellite this year. If you are considering only FM voice operating
for your AMSAT Field Day focus the single uplink/downlink channel
will be extremely challenging. As in prior years, this intense
congestion on FM LEO satellites drives the limitation in the rules
allowing their use to one-QSO-per-FM-satellite. This includes the
International Space Station. You will be allowed one QSO if the ISS
is operating Voice. You will also be allowed one digital QSO with the
ISS or any other digital, non-store-and-forward, packet satellite (if
operational).
If you have worked the satellites on Field Day in recent years, you
may have noticed a lot of good contacts can be made on the linear
transponder satellites including VO-52, FO-29, and AO-7. During Field
Day the transponders come alive like 20 meters on a weekend. The
transponders on these satellites will support multiple simultaneous
SSB or CW contacts.
The AMSAT Field Day 2013 event is open to all Amateur Radio
operators. Amateurs are to use the exchange as specified in ARRL
rules for Field Day. The AMSAT competition is to encourage the use of
all amateur satellites, both analog and digital.
For the complete listing of the AMSAT Field Day Rules please refer
to the documents posted on-line at:
http://www.amsatnet.com/2013fd.docx
http://www.amsatnet.com/2013fd.pdf
[ANS thanks AMSAT Director Contests and Awards, Bruce Paige, KK5DO
for the above information]
---------------------------------------------------------------------
Wilse Morgan WX7P (ex-KL7CQ) SK
Wilse Morgan, WX7P (formerly KL7CQ) passed away June 13 in Rice,
Washington. He is survived by his wife, Gimmie AL7LB.
An ARRL Life Member, Wilse was an Assistant Section Manager for
Eastern Washington and was very active on satellites, PSK31, DXing
and contesting. In 2009 he was inducted into the CQ Amateur Radio
Hall of Fame.
During his 20 year tenure in Alaska as KL7CQ, he taught courses in
Amateur Radio at the University of Alaska and at Anchorage Community
College, graduating more than 800 licensed hams. As a Volunteer
Examiner, Wilse was involved in the very first VEC exam in the nation
and was the first VE certified by the local FCC office in Anchorage.
For more information
http://www.arrl.org/news/view/wilse-morgan-wx7p-ex-kl7cq-sk
http://www.sdxa.org/
http://www.sdxa.org/?p=3321
[ANS thanks AMSAT The ARRL and Patrick, WD9EWK/VA7EWK for the above
information]
---------------------------------------------------------------------
ARISS News
Succesful Contacts
+ A Succesful contact was completed with Belarus State Universtity,
Minsk, Republic of Belarus.
Contact began 2013-06-04 21:00 and lasted about 9 minutes and 30
seconds. Contact was direct.
+ A succssful contact was completed with participants at Astronomy
Camp, Tucson, AZ and Christopher J. Cassidy, KF5KDR, on 08 June. The
event began at 19:55 UTC. The duration of the contact was
approximately 9 minutes and 30 seconds. The contact was telebridged
between NA1SS and VK4KHZ. The contact was audible over portions of
Australia and adjacent areas. The contact was conducted in English.
Astronomy Camp is a week-long residential program held at Kitt Peak
National Observatory and the Catalina Observatories near Tucson,
Arizona. Several thousand teenagers from 49 states and 20 countries
have attended the program since 1988, participating in an informal
education program involving hands-on activities in astronomy and
related subjects. The camp also operates workshops for adult leaders
in Girl Scouts, USA.
The ARISS contact dovetails well with the camp's projects involving
radio astronomy. The students engage in experiments with
electromagnetic energy, construct crystal radios, and tour the radio
telescope facilities at Kitt Peak, including climbing into the
antenna structure.
Upcoming Contacts
Liceo Scientifico Galileo Galilei, Catania, Italy, telebridge via
VK4KHZ
Contact is a go for: Sat 2013-06-22 14:57:26 UTC 41 deg
ARISS is requesting listener reports for the above contacts. Due
to issues with the Kenwood radio that are not fully understood at
present, the Ericsson radio is going to be used for these contacts.
ARISS thanks everyone in advance for their assistance.
Current occupants of the ISS include
Exp. 35/36 on orbit
Pavel Vinogradov RV3BS
Aleksandr Misurkin
Christopher J. Cassidy KF5KDR
Exp. 36/37 on orbit
Fyodor Yurchikhin RN3FI
Karen L. Nyberg
Luca Parmitano KF5KDP
Total number of ARISS ISS to earth school events is 823.
Each school counts as 1 event.
Total number of ARISS ISS to earth school contacts is 806.
Each contact may have multiple schools sharing the same time slot.
Total number of ARISS supported terrestrial contacts is 44.
A complete year by year breakdown of the contacts may be found in
the file.
http://www.amsat.org/amsat/ariss/news/arissnews.rtf
[ANS thanks ARISS, Dave AA4KN, and Charlie AJ9N, for the above
information]
---------------------------------------------------------------------
Satellite Shorts From All Over
+ APRS Messenger Android app now released
http://tinyurl.com/l2tes3v
+ World QRP Day Monday 17 June
Monday 17 June, is World QRP Day. Switch off the amplifier, turn
down the power on your rig and try QRP power. How many kilometres
per watt can you achieve. You will be amazed at what you can
achieve with QRP. Best is, aim an antenna skyward and connect via
a satellite using 5 watts or less.
+ According to Frank, K4FEG, Look for AO-7 to be in Mode "B" the
entire duration of Field Day.
---------------------------------------------------------------------
In addition to regular membership, AMSAT offers membership in the
President's Club. Members of the President's Club, as sustaining
donors to AMSAT Project Funds, will be eligible to receive addi-
tional benefits. Application forms are available from the AMSAT
Office.
Primary and secondary school students are eligible for membership
at one-half the standard yearly rate. Post-secondary school students
enrolled in at least half time status shall be eligible for the stu-
dent rate for a maximum of 6 post-secondary years in this status.
Contact Martha at the AMSAT Office for additional student membership
information.
73,
This week's ANS Editor,
EMike McCardel, KC8YLD
kc8yld at amsat dot org
------------------------------
Message: 3
Date: Mon, 17 Jun 2013 00:53:55 +0000
From: Jim Jerzycke <kq6ea@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: AO7-b MODE??
Message-ID: <51BE5E23.4080105@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I just heard it a few minutes ago in Mode B. Two stations on SSB,
several CW, and a lot of FM'ing.
I could barely hear my downlink on a 60* pass, so not sure what's going
on. I was able to get into FO-29 earlier today FB, so I know my station
is working.
73, Jim KQ6EA
On 06/16/2013 03:52 PM, k4feg wrote:
> Hello everyone,
>
> I know it is fathers day, but I have a question for the BB'S, Can we
> check to see if AO7 is in Mode A today?
>
> I have reports from Europe that it was not heard in Mode B but my
> compatriot in Europe does not have mode A capabilities.
>
> I have been doing yard work this morning in advance of rain so I
> missed the morning passes over the USA, I will be on later to see if
> we have had a switch.
>
> While during this Eclipse Cycle, AO7 has been coming up in Mode B
> since May 21, 2013, I have been advised that it is a purely random
> chance that it will come up in one mode or the other. There are
> periods of full eclipse lasting 9 or more minutes over Antarctica and
> maybe this was a random switch to Mode A.
>
> I will be monitoring the 1852UTC pass over EM55aj84ta to see what I
> copy, it is a 2 degree pass for me so it is not my best pass, any
> reports would be appreciated.
>
> 73 All FRM
> K4FEG
> STARCOM DIV
> GGHQ: EM55aj84ta
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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
>
------------------------------
Message: 4
Date: Sun, 16 Jun 2013 18:40:13 -0700
From: WA6FWF <wa6fwf@xxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: AO7-b MODE??
Message-ID: <51BE68FD.3080405@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
FM'ing
no batteries solar only so no regulation on the voltage bus, stations
that can't hear keep turning up their power until they can hear and
then the sat starts fm'ing because they are hogging all the available
power and so others now have a hard time using the sat... age old
story that will be repeated forever...
Kevin
On 6/16/2013 5:53 PM, Jim Jerzycke wrote:
> I just heard it a few minutes ago in Mode B. Two stations on SSB,
> several CW, and a lot of FM'ing.
>
> I could barely hear my downlink on a 60* pass, so not sure what's
> going on. I was able to get into FO-29 earlier today FB, so I know my
> station is working.
>
> 73, Jim KQ6EA
------------------------------
Message: 5
Date: Mon, 17 Jun 2013 07:15:56 -0400
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
To: "Mike Nettles" <Mike_Nettles@xxxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: psk-1 tnc-nb96 question
Message-ID: <51beefee.6e13ec0a.19eb.025d@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Mike,
They are Paccomm units, right? I've contacted them via telephone a few
times before, and they have always been helpful. It is possible that they
could send you new EPROMs to replace the current one(s), or maybe it's not
even necessary...they will help. I've also sent them a TNC for
upgrading/updating before, and it was worth the reasonable expense of doing
so.
Uh-oh---I just tried their website and it's down (suspended). You can still
search and find their phone number I'm sure...hopefully they are still
around and doing business!
73,
Mark N8MH
At 12:52 PM 6/16/2013 -0500, Mike Nettles wrote:
>From the link you posted looks like I have to use the TNC-MB96 and PSK-1
together to use it for regular 9.6k packet but I'm sure the TNC-MB96 could
work by itself. I'll look at the jumper settings..ect and see what I can
findout. Sure wish there were some birds up that I could use this with.
>Thanks for the reply,
>73
>Mike kb5wbh
> ----- Original Message -----
> From: Stefan Wagener
> To: Mike Nettles
> Sent: Saturday, June 15, 2013 7:57 AM
> Subject: Re: [amsat-bb] psk-1 tnc-nb96 question
>
>
> Looking at this:
>
> http://www.amsat.org/amsat/archive/amsat-bb/200003/msg00528.html
>
>
> it looks like it should work.
>
>
> Stefan
>
>
>
>
> On Fri, Jun 14, 2013 at 10:44 PM, Mike Nettles
<Mike_Nettles@xxxxxxxxxx.xxx> wrote:
>
> I picked this up a while back and it came with all the docs, jumper
info..ect. Can these be used for 9.6k baud regular packet? I hooked up the
tnc and it comes on with WA8DED Tnc Firmware V 2.6 . If it can be used for
regular packet can that firmware be replaced?
> Thanks
> 73
> Mike kb5wbh
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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@xxxxx.xxx. 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
------------------------------
Message: 6
Date: Mon, 17 Jun 2013 06:36:30 -0700 (PDT)
From: Fitri Rahmawati <fitri_9979@xxxxx.xxx>
To: fer deo <fer_deo@xxxxx.xxx>, budi purwanto
<budi.purwanto@xxxxxxx.xxx>, atien assi <atien.assi@xxxxx.xxx>, amsat
bb <amsat-bb@xxxxx.xxx>, dwi kalput <dwi_kalput@xxxxx.xxx>
Subject: [amsat-bb] Fitri Rahmawati
Message-ID:
<1371476190.85583.YahooMailNeo@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
wer
http://note-cs.net/zcb/xbiuyvljguc/tpjadgtcldtd/dpo.php Fitri Rahmawati
------------------------------
Message: 7
Date: Mon, 17 Jun 2013 06:55:00 -0700 (PDT)
From: James Sanford <k8zzu@xxxxxxxxx.xxx>
To: amsat bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] For sale-moving
Message-ID:
<1371477300.21203.YahooMailNeo@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Satellite antenna farm for sale:? M2:2mX22el, 70cmX42el, 8' fiberglass boom;
1.2Ghz helix 16t; UEK3000
2.4Ghz to 2m downconverter; G5500 rotor w/W0LMD interface for SatPC32; Icom
AG-25 es AG-35
preamps.?? All of the above with manuals for $900.00?? Prefer pickup (45mi
NW of Detroit) but will meet up to 150mi? Jim K8ZZU EN82gr
------------------------------
Message: 8
Date: Mon, 17 Jun 2013 13:11:10 -0400
From: Howie DeFelice <howied231@xxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] iridium comms in space
Message-ID: <BLU169-W928BDEC9B90A38C7514FCBE7830@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
While there may be good reason not to have a 2G/3G/4G phone transmitting
from orbit, I'm not so sure the same problems would apply to an Iridium
transceiver. Iridium is a global system with dedicated worldwide spectrum.
There are no terrestrial "cell sites" to interfere with. The Iridium system
utilizes satellite to satellite relay to handle handoffs, as long as the
process happens quickly enough this should not be a big problem. Even though
the Iridium transceiver on the spacecraft was referred to as a "phone", it
will more likely be a data modem using one of the burst data capabilities of
the system. This would make more sense from a power and size perspective and
an entire message could probably be sent during visibility of a single sat,
negating handoff issues.
Of course, this only deals with the technical issues. There are probably
regulatory ones as well. Iridium transceivers have been used on aircraft for
many years now, extending the application to LEO should not be that much of
a regulatory stretch.
Howie AB2S
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End of AMSAT-BB Digest, Vol 8, Issue 202
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