Also, I think Bob Brunniga... has documented that
15 deg fixed is the best overall el setting.
Yep, that puts the main beam on the horizon where you need it most and where
satellties spend over 70% of their time. Even at 15 degrees, you still are
within 1 dB of max gain on the horizon.
Saturday night, set your APRS radio to 147.585 and check your log the next
morning to see how many MS packets you got from other stations. You'll have
an order of magnitude more success if you do it on 50.62 MHz though there
will be fewer stations, and so the performance will likely be about the
Is the 6 meter frequency fm or usb or other?
Use APRS or TNC using AX.25 1200 baud packet FM
Would work much better at 9600 baud FM, but no time to organize participants.
Bob, WB4APR
-Original message-
From: Bob Bruninga wb4...@amsat.org
To: 'TAPR APRS Mailing List' aprs...@tapr.org
I believe that is true but that does not explain
why the optimum polarity setting on the receive
end would change during a pass.
That's easy. The circularity on a pair of crossed dipoles (about all you can
get on a spacecraft) May be designed for Right hand circularity when viewed
from
times more power.
Better to just live with the laws of physics... I guess.
Bob, WB4aPR
On Sat, Aug 4, 2012 at 2:47 PM, Bob Bruninga bruni...@usna.edu wrote:
I believe that is true but that does not explain
why the optimum polarity setting on the receive
end would change during a pass
Does anyone know how to send SERIAL Characters from MATLAB?
The catch is, we are trying to send BYTES above 127 (Extended ASCII) and the
usual %c formatter while using CHAR(133) for example, does not actually send
the byte 133.
Relevance is: Students working on an APRS satellite project.
I can
tried fwrite as documented here?
http://www.mathworks.com/help/techdoc/matlab_external/f62852.html
On Thu, Aug 2, 2012 at 10:18 AM, Bob Bruninga bruni...@usna.edu wrote:
Does anyone know how to send SERIAL Characters from MATLAB?
The catch is, we are trying to send BYTES above 127 (Extended ASCII
The key to success on a busy channel is short packets:
N3YKF-3APTT4,ARISS,IS:/131918z2901.30N/08210.41W288/000/n3ykf
mobile!/A=000121!wgO!
There are 41 bytes in that packet that are of no value in this application.
1) Remove the path IS (is 7 bytes in the actual protocol) and it is not
Las Vegas, Arizona area help needed among others?
The annual Operation On-Target of scouts and hams manning dozens of mountain
tops out west and back east to attempt signalling with mirrors and Ham radio is
taking shape for Saturday 21 July.
Here is the current map. http://goo.gl/maps/zc33
Unfortunately, 70cm UHF doesn't lend itself to unattended
SatGate operations like 2m VHF does. I tried catching the
ISS on UHF and only managed to hear, but not decode, one
packet burst. I can't imagine anything short of a full
satellite station with automatic azimuth/elevation control
I have tried ... but I don't see any response from the ISS...
It's temporarily on 437.550
You also have to use a path like: ARISS,SGATE,WIDE2-2
That path adds 14 extra bytes to a packet almost doubling the length and
therefore cutting throughput in half by doubling congestion. The only path
Drive or hike to the top of a USA mountain 3 Sundays from now on the 22nd of
July, noon to 4 PM and join the annual Golden Packet attempt.
* See http://aprs.org/at-golden-packet.html for east coast
* or http://aprs.org/pct-golden-packet.html for west coast
We need you with your D700/D710 or D72
] On
Behalf Of Bob Bruninga
Sent: Friday, June 22, 2012 10:26 AM
To: 'amsat-bb'
Cc: 'TAPR APRS Mailing List'
Subject: [amsat-bb] Field Day site-to-site texting
Every FD site will usually have APRS on line. Remember, you can contact any
other FD site in the world on your APRS channel. (144.39 in North
Every FD site will usually have APRS on line. Remember, you can contact any
other FD site in the world on your APRS channel. (144.39 in North America).
Just send them an APRS text message.
Of course, this assumes you know their callsign. To facilitate learning who
else is on the air, send a CQ
Transit of Venus Special Event, 6 June 2012:
For the 7th time in Human history and last time this
century, Venus will pass in front of the sun on 6 June 2012.
See web page: http://aprs.org/VenusTransit2012.html
Preliminary APRS Report:
There were 9 overall observation sites that checked in
: Re: [amsat-bb] Transit of Venus event 5/6 June
To: Bob Bruninga bruni...@usna.edu,amsat-bb@amsat.org
Cc: 'TAPR APRS Mailing List' aprs...@tapr.org
Transit of Venus Special Event, 5/6 June 2012:
For the 7th time in Human history and last time this century, Venus will pass
in front of the sun
for Techniques.
Bob Bruninga, WB4APR (will be observing in Japan with a Japanese callsign
JH1IBN-7 from Kyoto.
___
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
The company that comes out with an AZ/EL unit that
is about $200 is going to sell a million.
Radioshack already does. Its called a TV rotator, and I would buy one before
they are no more!. For LEO satellites one does not need elevation 98% of the
time and with a modest beam (ARROW type)
] On Behalf
Of Bob Bruninga
Sent: Wednesday, May 16, 2012 5:37 PM
To: 'TAPR APRS Mailing List'; a...@yahoogroups.com; amsat-bb@amsat.org
Cc: 'Pete Loveall AE5PL Lists'
Subject: [aprssig] Epic Journey to Dayton! (CQ Dayton)
Epic APRS mobile-to-Dayton journey Begins.
Other than normal APRS, you can
THE SUN!!! *** Google
for Techniques.
Bob Bruninga, WB4APR (will be observing in Japan with a Japanese (TBD)
callsign)
___
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur
Epic APRS mobile-to-Dayton journey Begins.
Other than normal APRS, you can also see over the RF horizon! Maintain
contact with all Dayton bound. Send your APRS message to CQSRVR and begin
with CQ DAYTON ... text...
Every other mobile in the country that is also participating will see your
What's funnier is the 35 million spent on solar panels...
to save $475k a year...[and] take 70 years to break even.
Its a lot more than breaking even. Don't forget about a few million tons of
pollutants and burned fossil fuel byproducts, and destroyed land and habitat
that now don't have to
You would be amazed at how little power a solar panel gets in the classroom or
the lab.
I measure it. It is one half of one percent of full sun (0.5%). Practically
nothing. Here are two examples:
1) We have a flight unit of the original TRANSIT satellite in our sun lit
wall-of-glass
I will be at the Cochise... Hamfest on (5 May) in Sierra Vista, Arizona.
Yearly reminder: Everyone involved with a hamfest should consider:
1) Is the LAT/LONG on the web page?
2) Is there an APRS object marking the HAMFEST on the air 2 weeks in advance
marking the spot so that drivers within
Photos now posted on http://aprs.org/balloons.html
-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Bob Bruninga
Sent: Saturday, April 28, 2012 11:55 AM
To: aprs...@tapr.org
Cc: amsat-bb@amsat.org
Subject: [amsat-bb] USNA Party Balloon
Party Balloon success!...
Everything possible went wrong! A disaster of monstrous proportions. But
finally got it all working and just wanted it gone! We released it about 1545
which means we missed getting off the academy before the afternoon's formal
parade and lost 30 minutes going out
DELMARVA Hams: We are going to launch an APRS balloon at about 1300 on
Friday if we get it all together by then. It will drift at about 5000 feet
with a radio range of only about 100 miles or so. It has a wireless 2.4 GHz
live camera on Channel 1.
We will command cut-down somewhere over the
any one have a good idea for a omni directional antenna for the birds?
3/4 wave vertical. Has almost 7 dBi gain above 30 deg.
For 70cm downlinks, this means a 19.5 vertical over a ground plane. Also
is a perfect 1/4wave on 2 meters.
It's the yellow curve on the plot about 80% down this page:
Anyone want to put their APRS or Satellite talents on the air in Mongolia?
A Scientist goes there each summer and has the opportunity to put some small
solar powered APRS weather trackers on the air (via the ISS). Here is his
idea:
If anyone... would like to hack together 2 or 3 small solar
-
From: Bob Bruninga [mailto:bruni...@usna.edu]
Sent: Thursday, March 29, 2012 11:25 PM
To: 'Bob Bruninga'; amsat-bb@amsat.org
Cc: 'TAPR APRS Mailing List'
Subject: RE: [amsat-bb] Party Balloon Long Duration Mission (???!)
It went over my horizon (from Annapolis) at about 0300z just about perfectly
Does anyone know how to track Winlink Ocean sailors so we can find someone
to listen for our long duration Balloon out over the atlantic? Without
boats, it will not be in range of land until 3 April over the African
coast.!
See projected track: http://aprs.org/balloons.html
Bob, WB4aPR
Balloon web page is up. Launch hopefully by sunset from Annapolis Maryland.
Start here:http://aprs.org
-Original Message-
If we are lucky, we hope to launch our 6 party-balloon long duration payload
Thursday evening around sunset EST.It has no APRS, just a 10m CW
telemetry
Balloon was released at 2330z (1930EDT) and is headed SE from Annapolis at 6
knots.
Rising very slowly. But it reached Freezing (0C) at 0020z so that should be
about 7500'
See http://aprs.org/balloons.html
-Original Message-
Sent: Thursday, March 29, 2012 4:43 PM
But We notice another
rises and maybe we will get some skip?
Update soon on http://aprs.org/balloons.html
Bob, WB4aPR
-Original Message-
From: Bob Bruninga [mailto:bruni...@usna.edu]
Sent: Thursday, March 29, 2012 8:43 PM
To: 'Bob Bruninga'; amsat-bb@amsat.org
Cc: 'TAPR APRS Mailing List'
Subject: RE: [amsat
We need an Australian Amateur Astronomer and HAM operator in Canberra on 4-6
June 2012.
We have a science team of students from the USA to observe the last transit of
Venus this century in Canberra. We want a local Australian Ham to be there to
see if we can use ham radio and the speed of
Launch Thurs PM maybe... Tune up those 10m beams.
If we are lucky, we hope to launch our 6 party-balloon long duration payload
Thursday evening around sunset EST.It has no APRS, just a 10m CW telemetry
system. We will have to locate it by signal strength and beam headings only.
If you
Still, no one has indicated if these are CARRIER or DIAL freqs? Since they
are 5 minutes apart,it would sure be nice to simply set the dial and forget
it.
I still have heard nothing. I am assuming they are carrier freqs and so I
am sitting down 1 KHz.
Bob, WB4APR
-Original Message-
with Latitude, Longitude, Altitude and
Battery Voltage
I agree with you Bob, not the most user friendly
site for finding out specific info.
73,
Colin
On 24/03/2012 13:11, Bob Bruninga wrote:
The Project Blue Horizon team is attempting to
break
current Amateur Radio
If you live in San Bernadino, Calif and need some solar power for your shack
(house) I have heard that BP solar is liquidating over 210,000 panels and an
unknown number of string inverters, sunnboy, fronius, etc BUT all of them are
out near SanBernadio, Ca (except for a few in europe and
An around the world balloon attempt will be made sometime next week. The
payload is about the size of two 9v batteries (50 grams) and will be carried
by 10 underinflated party balloons above 40,000 feet in the Jet Stream.
The balloon will only have CW battery, Inside and Outside temp data. All
lawyers try to buy their way into putting Transmitters in the the
RECEIVE ONLY satellite bands.
Bob, WB4APR
From: Robert McGwier [mailto:rwmcgw...@gmail.com]
Sent: Wednesday, February 29, 2012 7:30 PM
To: Bob Bruninga
Cc: amsat-bb@amsat.org
Subject: Re: [amsat-bb] Lightsquared Analogy
On Feb 29, 2012
I finally figured out a good analogy about the LightSquared and GPS fiasco.
---
There is a music room where people can go and, with headphones, listen to
their own music. No one disturbs anyone else. Everyone is happy.
A LightSquared rock band comes into the room and begins to play
We are working on a 28 MHz transatlantic Balloon with a
CW transmitter on 10m using (of course) a vertical dipole.
Do you have a 10 meter (28 MHz) vertically polarized beam?
The response was as expected. No one has. Therefore we will accept
horizontal beam headings. Also we will ask for
Just wondering if anyone has a vertical beam.
A horizontal beam [for this vertical balloon signal] will be
useless for direction finding
That is only true when receiving the signal
via direct line of sight propagation.
The transmitter is only 10 milliwatts, so we only expect
Do you have a 10 meter (28 MHz) vertically polarized beam?
We are working on a 28 MHz transatlantic Balloon with a CW transmitter on 10m
using (of course) a vertical dipole.
It will have no GPS, so tracking will be entirely by beam headings and some
signal-strength assessment.
Just wondering
The Naval Academy is advertising a tenure track position for PHD professor
with strong EE background in the Aerospace Dept. IE, help build small
satellites...
And they do mean build not theorize about it...
http://www.usna.edu/JobInfo/
Bob, WB4APR
Robert,
Remember also, we are looking for someone with AMSAT and AX.25 packet
experience in Hawaii for out upcoming Arctic Buoy deployment next month.
A Hawaii ground station is required to activate PCSAT-1 on an ascending pass to
configure it so that it can hear the Buoy.
We want someone
... a satellite released from its launch adaptor
with a spin rate of in excess of 30rpm! (36rpm?)
RAFT cubesat (5 cube) was released with a spin rate of 80 RPM due to a
separation failure between the two cubesats (one antenna stuck to the
other).
See
looks like it just got solved, I picked up a message
on my packet bbs from RK3KPK, looks like he is using
internet gateways and that might explain him ending
up on 144.390 thinking it was a lap.
Very interesting. I have forgotten so much about regular packet!!! SO somehow
there was a
We are again in need of a quality PCSAT command station in Hawaii.
This is for our Arctic Buoy experiment at the North pole! (off Barrow Alaska).
The problem is that the ISS digipeater only gets gets 1.5 degree above the
Horizon in Barrow. Probably won't work.
Fortunately, PCSAT-1 overflies
This morning, while getting ready for Saturday's hamfest, I saw this:
10:05:32R INDIORK3KPK Port=1 UA R F
This call is from near Moscow.
INDIO is one of our digis.
Yes, INDIO is a digi in INDIO, Claifornia. It appears to be a KPC3 version
9 using the TOCALL of APN390.
The TOCALL of RK3KPK
We will be floating a buoy with APRS transponder from Barrow Alaska in
March.
Any hams up there to listen to it directly before the ice melts?
Then after it begins to drift, we will need AMSAT hams anywhere in Alaska to
capture any packets on 145.825 via ISS. The ISS gets to 1.5 degrees
Went to local flea market today (34F degrees out) for a wwod stove and was
shocked to see a guy selling brand-new boxes of VHF and UHF, and Dual band HT's
fully programmable from 140 to 170 and 440 to 570 MHz 5 to 7 watts.
He had several brands and some were even dual band. Most boxes had
are attempts still in the works for restoring pcsat ?
Just came over and seen echo s from command-1 A couple other calls as
well .
Yes, I got in and got control, and that freed up power, but almost
immediately several stations hit it with digipeats before I got the digi
turned off. So it
You omitted all of the other full duplex radios: The D7 and D72 HT's and
D700 and D710 mobiles.
Full-duplex has a very important purpose in the satellite world.
you don't need base-station radios like the Icom IC-9100, IC-910,
Kenwood TS-2000, or Yaesu FT-847. If you own two handhelds,
APRS Email Format:
KQ6UPBEACON,ARISS::EMAIL:kq...@kq6up.org This is a test of ISS
mail.
Yes, that is correct APRS message format for an Email
How do I send email on 144.390? Is the same way
as I would send via the ISS?
yes, you could replace the via path with WIDE2-2,
that should
I have a brother in Strafford, NH (not a ham)...
Any chance he might be willing to assist in the Ham Radio Appalachian Trail
Survey being planned for this spring? Volunteer ham hikers with APRS radios
will be hiking and need volunteer logistics support at road crossings. See
APRS Email Format:
KQ6UPBEACON,ARISS::EMAIL :kq...@kq6up.org This is a test of ISS
mail.
Thanks, Bob. It worked perfectly... it means I would be
able to email her from anywhere when I am out exploring.
Yep, anywhere on the planet except the poles assuming:
1) There are enough IGates
, but it is steel, not aluminum like the
G3RUH. I used it on AO-40 for 24 GHz. Let me know off-list if you want it.
73,
Jerry, K5OE
previous message
You probably have one of the K5GNA BBQ dishes. The G3RUH is a solid round
spun dish.
73, Drew
-Original Message-
From: Bob Bruninga bruni
KQ6UPBEACON,ARISS: UI: :EMAIL:kq...@kq6up.orgThis is a test
of ISS mail.
That is a good APRS email packet. But the3 next lines indicate
that you were CONNECTING to RS0ISS and not remaining in UI mode. If y ou are
connected, then you get the crew not available text, and you will
It is 17 miuntes ahead of my 5 day old keps... Heard in Maryland at 11:43
EST (1643z).
Bob
-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Joe
Sent: Tuesday, January 03, 2012 11:09 AM
To: amsat-bb@amsat.org
Subject: [amsat-bb] Re:
PCSAT SUMMARY and SOLICITATION: Our PCSAT recovery attempt this week was
unsuccessful this time, but she will be back to normal (intermittent, weak)
operation in a few weeks.
BACKGROUND: PCSAT is functional a few times a day in the northern
hemisphere year round. You can see its telemetry and
Anyone near Kingston Ontario or Watertown, NY that can contact VE3FFR?
His email is not listed with QRZ and I need to ask him to shut down his
PCSAT beacon. This would reduce the load on PCSAT so that maybe I can get a
command in to get control and maybe make a recovery.
Next recovery effort
Almost recovered. Mike got command over Germany (DK3WN) but it did not
hold.
At 1300z pass over east coast, I got 3 telemetry packets, 5, 6 and 8
minutes into the pass with Latitude between 29N and 39N. The first packet
showed +Z (best panel) current was 93 mA.
Above that latitude, packets
Ah, but an APRS satellite would be one
of those silly pointless FM beepsats.
APRS has had an HT global text-messaging tool before the cell phone craze
brought it to everyone.
Since 1998, Ham radio has had an HT (the D7) that can text-message any other
APRS HT or mobile on the planet in
Meteors scatter works not just during showers, but give enhanced paths
throughout the day and night on a regular basis. We jsut missed the Geminids 4
days ago, but anyone in remote areas with a TNC can easily monitor for packets
anytime, as long as they pick a frequency where there is known
Any one can tell me wath is the current path
for digipeate via ISS .
VIA ARISS
Will do nicely.
___
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!
The recent Balloon flight over the atlantic was a clear demonstration that
there is no APRS IGate on Bermuda leaving about 800,000 square miles of the
Atlantic without coverage.
I've never been there and I assume the old NASA station no longer exists for
decades. What kind of government or
This transcontinential and trans-Atlantic Balloon mission was fantastic!
But in reviewing all the hundreds of emails and minute-by-minute tracking
excitement, I just went back to read about the balloon itself, and can find
nothing.
The original post referred to the California Near SpaCe Project
AMSAT/APRS ops needed in Europe to track trans-atlantic balloon!
Here is the last position copied on APRS with it 500 miles out to sea headed
for Europe..
http://aprs.fi/?call=k6rpt-11mt=roadmapz=7timerange=172800_s=ss_call
Its on USA freq of 144.39 so will not be heard in Europe except by
airfield at Lajes
(or there it was a few years ago). Maybe you can find
someone there with a 2m capable receiver willing to record a long .Wav file...
- Reply message -
De: Bob Bruninga bruni...@usna.edu
Para: amsat-bb@amsat.org
Asunto: [amsat-bb] AZORES -- Get Set To Monitor K6RPT-11
Cancel my request,
Drats, emails crossed.
Congratulations on an excellent recovery!
Bob, Wb4APR
From: aprssig-boun...@tapr.org [mailto:aprssig-boun...@tapr.org] On Behalf
Of Mark Conner
Sent: Tuesday, December 13, 2011 5:09 PM
To: aprs...@tapr.org
Subject: [aprssig] K6RPT-12
Isnt anyone in Indiana going out to pick up the other DX balloon that landed
about half way between Terra Haute and Bloomington Indiana?
It was still beaconing up to about 3 hours ago, and has a perfect posit.
Just go pick it up?
See: http://aprs.fi/?_s=oscall=a%2FK6RPT-12
Bob, Wb4APR
While everyone in Southern Europe and Northern Africa is listening for the
Transatlantic Balloon, K6RPT-11 on 144.39, I should also offer that you
might hear (during mid-day only) a possible packet from W3ADO-1 too.
PCSAT-1 has a downlink on 144.39 that is usually never heard in the USA due
to
there is a landing team in
Portugal, or Gibraltar getting ready to go!
Bob, Wb4APR
-Original Message-
From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Bob Bruninga
Sent: Tuesday, December 13, 2011 5:58 PM
To: amsat-bb@amsat.org; 'TAPR APRS Mailing List
The K6RPT-11 transatlantic balloon
is now being heard in Portugal on 144.39.
At 02:00:30 z K6RPT-11 was heard
by CT1END in Amadora, Portugal.
APRS packets:
2011-12-14 02:00:30 UTC: K6RPT-11APBL10,WIDE2-1,qAR,CT1END,PORTUGAL:
!3531.31N/01636.70WO077/129/A=110384V1B2 CNSP-11
The balloon
So the only reason we get to use it is to
wear down the batteries in hopes of a hard reset.
Then what they turn the digipeater back off?
Again, demeaning what others are doing accomplishes nothing positive.
From inception, through design, and since Launch, the FAST1 team has always
said
Anyone else feel the need for a moderated list?
Not really... it only hides the truth. Unfortunately it reveals what and
who we have to work around.
In any voluntary endeavor such as ham radio, those that can contribute
something positive do (not just snide comments) or are quiet and get out
HPF above 500 MHz? Then the TV would not be able to see anything but a few
UHF channels.
What is needed is a stub filter. Just a piece of open ended coax 13 long
Ted into the antenna lead
The 13 is about 66% of a quarter wave at 2 meters.
Done
Bob, WB4APR
-Original Message-
What is needed is a stub filter. Just a piece of open ended coax
13 long Ted into the antenna lead
The 13 is about 66% of a quarter wave at 2 meters.
That could work too, but not if they have an active splitter
that's distorting and crunching away like a little fuzzbox,
generating
The only solution is for your neighbor to remove the
powered splitter from the antenna system
The only other solution would be to get a stopband
filter(blocking 144 to 148)... these type of special
filters are not cheap.
Again, a 5 cent piece of coax cut as a 1/4 wave stub at 2
It's not a sync problem. All the images are properly framed. Just not good
images even though the signal strength sounds Q5 to me.. Just enough noise
in all of them to be not worth looking at. Ill keep watching... Bob,
WB4APR
ALl the rest you can tell MAYBE that it is some kind of picutre
Jeff, KB8VCO and I were successful in transmitting
a picture and receiving back an image via the
ARISSat-1/RADIOSKAF-V transponder.
By the way, once I got MMSTV loaded I decided to just park it on 14.230 MHz all
day long and watch the SSTV images come rolling in. I have been watching them
Only just seen this, hadn't realised there was a Space
Plasma experiment using the 145.825 MHz packet system
http://knts.tsniimash.ru/Shadow/en/Overview.aspx
I couldnt find the details about how they are going to capture data. Is it by
Hams manually capturing files and then emailing them
Bob, You might want to consider a Helical antenna
for your mobile station. It would have less wind
drag and easier to rotate.
Actually, I'm beginning to think we will build our own dish. I have a 5' solid
metal dish. I think we will just use it as a form and lay in some copper
strips evry
Besides the occasional MDS dishes, is there a source now of larger
commercial 2.4 GHz wire or mesh dishes?
We want to outfit a van with a 4' dish for Balloon Tracking live downlink
video and not have it blow off the roof at 70 MPH.
I'm considering changing over many of our student projects to
Just way to many kids, lids and space cadets
Standing in their back yard on a FM HT.
Pass after pass it seems to always to be the same people.
The dark-side of Ham radio is the Curmudgeons who feel they must hold
everyone back to their own style and their own narrow view of the hobby.
But
I'm curious, as someone who was involved in designing
a nanosatellite. What sort of payloads would be of
interest to the amateur community?
The A#1 Killer AP is something we have tried twice on short li=ved missions
and which we already have ready for our next mission, (but no launch
the risk of collision is more real than one might think.
I would think the risk of collision is so tiny
as to be effectively negligible.
I think it is, but when negligible incurs about a BILLION$$$ worth of
loss, it magnifies the risk.
If we position our satellite halfway between two...
Again I ask, why are people so reluctant to release
the source code for software, but are more than happy
to publish the circuit diagrams for devices they design?
Because maybe they have invested years of their time into it, and don't want
to see it all hacked up beyond recognition by the
I wonder if it would be possible to ... send
live satellite passes as objects to the local
APRS RF network so as to alert local users when
a satellite passes over our area.
Amen! This was always a favorite APRS application back when we had 3 or 4 FM
repeater satelites. Mobiles could work
[mailto:amsat-bb-boun...@amsat.org] On
Behalf Of Bob Bruninga
Sent: Thursday, September 15, 2011 8:52 AM
To: 'AMSAT BB'
Subject: [amsat-bb] Re: Which Mobile Mag Mount?
Everyone's comments are correct and valid within their context. But the
original question was optimizing for the casual mobile operator
to match the instantaneous polarization of the satelite. No
mechanical mounting can do that.
Bob
-Original Message-
From: Ted [mailto:k7trkra...@charter.net]
Sent: Thursday, September 15, 2011 7:41 PM
To: 'Bob Bruninga'; 'AMSAT BB'
Subject: RE: [amsat-bb] Re: Which Mobile Mag Mount?
Bob
Everyone's comments are correct and valid within their context. But the
original question was optimizing for the casual mobile operator in motion.
So here are some additional considerations...
Second, any vertical antenna...will have a [null overhead]
So, think about it: A GREAT pass of 90
tiny micro whips are ideal, but most of them now are being made
as dual band which then destroys their 7 dBi gain above the horizon.
No easy answers here.
Bob
-Original Message-
From: Ng, Peter [mailto:peter...@bccdc.ca]
Sent: Thursday, September 15, 2011 12:47 PM
To: 'Bob Bruninga '; AMSAT
because it will be useable lower and the poorer
performance higher up will be made up by the reduced range.
Good luck.
Bob, WB4APR
On Thu, Sep 15, 2011 at 12:07 PM, Bob Bruninga bruni...@usna.edu wrote:
Peter,
I donno. The only 1/4 19.5 antenna I ever used I just drilled into the
roof above the dome
Amen.
1/4 wave simple 19.5 whip is ideal not only for VHF, but also has almost 7
dBi gain on UHF above 25 degrees. So it performs very well on high
elevation passes.
Any mobile gain antenna optimized for mobile operation will, by definition,
perform worse for satellites than the raw 19 whip.
We just got a 2500 Watt phased array transmitter and antenna that can put
out up to 4 several hundred watt solid state beams at 10.14 GHz.
The prospects are tingling, but since it takes a full rack of equipment
within a few feet of it, one would have to have a top floor room. And then
, it only
... ;-)
Bob, WB4aPR
- Original Message -
From: Bob Bruninga bruni...@usna.edu
To: amsat-bb@amsat.org
Sent: Thursday, September 15, 2011 12:52 AM
Subject: [amsat-bb] 2500 Watts on 10.14 GHz?
We just got a 2500 Watt phased array transmitter and antenna that can put
out up to 4 several
If you can only work while in motion and driving,
well, nevermind, LOL. A 1/4 wave would probably
be as best as you can do then, without going to
something like one of the quadrifilars...
Remember, the 1/4 wave 19 whip does perfectly fine on the uplink with any 35W
mobile. That is never
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