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CX2SA > SATDIG 20.09.08 01:15l 824 Lines 29051 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: OLPC-HYPERTERM-PICOCOM (Doug Faunt N6TQS +1-510-655-8604)
2. Re: GO32 APRS ? (Robert Bruninga)
3. AO-27 Problems (Sebastian)
4. Re: OLPC-HYPERTERM-PICOCOM (Scott Richardson)
5. Re: OLPC-HYPERTERM-PICOCOM (nigel(AT)ngunn.net)
6. Re: AO-27 Problems (Patrick STODDARD (WD9EWK/VA7EWK))
7. OLPC ONE LAPTOP PER CHILD (Mr Jeffrey L Ross)
8. Richard Garriott on ISS (Frank H. Bauer)
9. Re: OLPC ONE LAPTOP PER CHILD (GW1FKY(AT)aol.com)
10. Polarity questions (Tim Tapio)
11. Re: Polarity questions (Edward Cole)
12. Re: Polarity questions (Sebastian)
13. Re: Polarity questions (Ryan Butler)
14. Re: Polarity questions (Angus)
15. Re: Polarity questions (Jim Jerzycke)
----------------------------------------------------------------------
Message: 1
Date: Thu, 18 Sep 2008 14:28:49 -0400 (EDT)
From: Doug Faunt N6TQS +1-510-655-8604 <faunt(AT)panix.com>
Subject: [amsat-bb] Re: OLPC-HYPERTERM-PICOCOM
To: tim(AT)timtapio.com
Cc: amsat-bb(AT)amsat.org
Message-ID: <20080918182849.B9D4F1A405(AT)panix2.panix.com>
It's fully described as a OLPC XO laptop. I've got one, and find it
painful to use, although it's got some useful and interesting
features. I don't have time for that difficulty.
This one shows some possible problems with charging, so I sometimes
had to use plugged in, mostly for the two months I was traveling with
it. It does attract attention, though.
Make an offer if you're interested in buying it.
73, doug
From: "Tim Tapio" <tim(AT)timtapio.com>
Date: Thu, 18 Sep 2008 13:04:23 -0400
Content-Language: en-us
Brings up the question, what is an OLPC? I do a google search and end up
with "One Laptop Per Child". I don't think that is the proper context.
de Tim, K4SHF
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org]
On
Behalf Of nigel(AT)ngunn.net
Sent: Thursday, September 18, 2008 11:28 AM
To: radiooperator(AT)comcast.net; amsat-bb(AT)amsat.org
Subject: [amsat-bb] Re: OLPC-HYPERTERM-PICOCOM
Nobody else has a OLPC. From where does one buy them?
Original Message:
-----------------
From: Mr Jeffrey L Ross radiooperator(AT)comcast.net
Date: Tue, 16 Sep 2008 12:33:42 -0400
To: amsat-bb(AT)amsat.org
Subject: [amsat-bb] OLPC-HYPERTERM-PICOCOM
Hi folks, I am real close to getting the OLPC To run a tnc and rig. I found
A software called PICOCOM/MINICOM Thats similar to hyperterm in windows.
Just type yum install picocom or yum install minicom at the terminal
acitivity root. Then type the name to start it. anyone want to work with me
on it contact me off list. Now we can use them for sat work,packet, aprs.
emcom,, etc.
kc8gkf
------------------------------
Message: 2
Date: Thu, 18 Sep 2008 15:01:54 -0400
From: "Robert Bruninga" <bruninga(AT)usna.edu>
Subject: [amsat-bb] Re: GO32 APRS ?
To: "'Henk, PA3GUO'" <hamoen(AT)iae.nl>, <amsat-bb(AT)amsat.org>
Message-ID: <791F34E1E9FB46638B1F7B5FD4EC7EE6(AT)ewlab.usna.edu>
Content-Type: text/plain; charset="us-ascii"
> I seem to fail to understand the APRS mode of GO32:
> This is the only source of documentation I have:
> http://web.usna.navy.mil/~bruninga/GO32-ops.html
>
> Which states:
>
> 145.85 MHz All APRS messaging (or fixed station non-Mic-E
> positions). . Only TOCALLs that begin with "APxxxx".
This is because APRS messaging uses an AX.25 Destination Address
of APxxxx where xxxx is a version number. I call that AX.25
Destination address the "TOCALL" for brevity...
And on 145.85 uplink, the GO-32 satellite IGNORES any packet
that does not begin with the AX.25 DESTINATION address that
begins with "A".
> 145.93 MHz All APRS Mic-E positions and
> status(D7, D700 and D710s with comment set
> to "Committed, Special or PRIORITY"...
On the 145.93 UPLINK, the GO-32 folks opened up additional
INITIAL bytes of "2,3,4, or 5" as possible AX.25 DESTINATION
addresses. In this case, a Mic-E packet at any LATITUDE between
20 to 59 degrees latitude will begin with one of those digits.
... But only if the "comment" set to the above selections.
Because if they are not set to that selection, then the
additional bit is used and the leading byte of the AX.25
DEESTINATION field is no longer a digit from 2 to 5.
The reason the GO-32 (and ECHO, AO-51) and other PACSAT-BBS
Protocol birds have to have this first-byte filtering, is so
that the constant NOISE in the receiver does not forever trigger
the 9600 baud interrupt and consume inordinate amounts of
processing power on noise. By ignoring all false detections
except those that begin with the very first matching byte, then
the CPU can ignore 255 out of all 256 possibilities of noise.
> The reason for these uplink distinctions is due to GO-32
> hardware that will only digipeat a packet on 145.85 that has
> a TOCALL beginning with "A". (All APRS fixed station packets
> and all APRS messages including D7 and D700's) . The
> 145.93 channel will only accept packets that begin with a
> digit between 1,2,3,4,5,6,7. . But fortunately the D7 and
> D700's do this naturally as long as the position comment is
> set to "committed, SPecial or PRIORITY"...
>
> Q1: do the TOCALLs need APxxx or Axxx on 850 ?
> (in CONV mode type :APxxx ?)
The TOCALLS really refers to the AX.25 DESTINATION address.
> Q2: should here ":2xxx" work ?
Neither of these will do anything. I think you are thinking of
the APRS MESSAGE TOCALL, and that can be anything. But it has
to be the complete format. As in :APRSTOCAL:message text. It
must be 9 bytes long ad begin and end with colons followed by
text. The BEST APRS messages to send via any satelite should be
addressed to :ALL......:hello world..., beause ALL APRS radios
will capture a message to ALL. Otherwise it will ignore it.
Notice that the ... Dots have to actually be SPACES to work.
Bob, WB4APR
>
> Thanks !
> Henk, PA3GUO
>
> .... so lost :-)
>
>
>
>
>
>
>
>
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)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
>
------------------------------
Message: 3
Date: Thu, 18 Sep 2008 15:11:32 -0400
From: Sebastian <w4as(AT)bellsouth.net>
Subject: [amsat-bb] AO-27 Problems
To: AMSAT BB <AMSAT-BB(AT)amsat.org>
Message-ID: <9DDEA0B8-DB02-48DD-9BF1-428656376257(AT)bellsouth.net>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
Is there a problem with AO-27? Lately it seems that the bird is
turned on for less than 10 minutes, then is turned off for over an
hour. In the last several days, it seems that whenever there is a
pass over the USA, it's off.
Just wondering if this is normal, or if there are problems.
73 de W4AS
Sebastian
------------------------------
Message: 4
Date: Thu, 18 Sep 2008 17:17:24 -0400
From: "Scott Richardson" <scott(AT)aves-specta.com>
Subject: [amsat-bb] Re: OLPC-HYPERTERM-PICOCOM
To: <amsat-bb(AT)amsat.org>
Message-ID: <00a901c919d3$f2b4d160$6501a8c0(AT)seaturtle>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
OLPC produced a user-repairable (to a degree!), 2-watt laptop with built-in
wifi, mesh networking, and a screen viewable indoors or out... so it's easy
to see the ham radio potential. The laptops are designed for children (ages
6-12) in third-world countries, the Sugar interface is a bit awkward, and
there have been some serious blunders along the way. These have dampened
enthusiasm in the USA.
The official website is at www.laptop.org.
Solid information is in the wiki: http://wiki.laptop.org/go/Home
Unofficial but useful source: http://www.olpcnews.com/
The second 'Give One, Get One' (G1,G1) program starts in November and ships
through Amazon.
73, Scott N1AIA
------------------------------
Message: 5
Date: Thu, 18 Sep 2008 19:20:30 -0400
From: "nigel(AT)ngunn.net" <nigel(AT)ngunn.net>
Subject: [amsat-bb] Re: OLPC-HYPERTERM-PICOCOM
To: tim(AT)timtapio.com, nigel(AT)ngunn.net, radiooperator(AT)comcast.net,
amsat-bb(AT)amsat.org
Message-ID: <380-220089418232030765(AT)M2W021.mail2web.com>
Content-Type: text/plain; charset=iso-8859-1
I always assumed that was to what the thread referred.
Original Message:
-----------------
From: Tim Tapio tim(AT)timtapio.com
Date: Thu, 18 Sep 2008 13:04:23 -0400
To: nigel(AT)ngunn.net, radiooperator(AT)comcast.net, amsat-bb(AT)amsat.org
Subject: RE: [amsat-bb] Re: OLPC-HYPERTERM-PICOCOM
Brings up the question, what is an OLPC? I do a google search and end up
with "One Laptop Per Child". I don't think that is the proper context.
de Tim, K4SHF
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] On
Behalf Of nigel(AT)ngunn.net
Sent: Thursday, September 18, 2008 11:28 AM
To: radiooperator(AT)comcast.net; amsat-bb(AT)amsat.org
Subject: [amsat-bb] Re: OLPC-HYPERTERM-PICOCOM
Nobody else has a OLPC. From where does one buy them?
Original Message:
-----------------
From: Mr Jeffrey L Ross radiooperator(AT)comcast.net
Date: Tue, 16 Sep 2008 12:33:42 -0400
To: amsat-bb(AT)amsat.org
Subject: [amsat-bb] OLPC-HYPERTERM-PICOCOM
Hi folks, I am real close to getting the OLPC To run a tnc and rig. I found
A software called PICOCOM/MINICOM Thats similar to hyperterm in windows.
Just type yum install picocom or yum install minicom at the terminal
acitivity root. Then type the name to start it. anyone want to work with me
on it contact me off list. Now we can use them for sat work,packet, aprs.
emcom,, etc.
kc8gkf
p.s. how come no one else is working on this? must be busy.
KC8GKF
_______________________________________________
Sent via AMSAT-BB(AT)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
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Not an AMSAT-NA member? Join now to support the amateur satellite program!
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------------------------------
Message: 6
Date: Thu, 18 Sep 2008 17:15:06 -0700
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb(AT)wd9ewk.net>
Subject: [amsat-bb] Re: AO-27 Problems
To: amsat-bb(AT)amsat.org
Message-ID:
<2e18ad3e0809181715k3e73e0eetd8afd47bcb4da23f(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Hi Sebastian!
> Is there a problem with AO-27? Lately it seems that the bird is
> turned on for less than 10 minutes, then is turned off for over an
> hour. In the last several days, it seems that whenever there is a
> pass over the USA, it's off.
>
> Just wondering if this is normal, or if there are problems.
AO-27 has apparently been off since last weekend. I worked a pass
Friday afternoon, but since then there has been no reported activity.
The http://oscar.dcarr.org/ web site appears to confirm that.
For at least the past few years, AO-27 would only be on for a portion of the
daylight passes (moving from south to north) over the Northern Hemisphere.
For most of the past 19 or 20 months, it would be on for 7 minutes at a time
as the satellite crosses 29 degrees North latitude (approximately).
The AO-27 operating schedule is available from the http://www.ao27.org/
web site, but in recent months it appears that the web site schedule would
be off by 7 or 8 minutes from the satellite's onboard schedule. There is a
Java-based program that will show the satellite's schedule, and that has
been more in line with the onboard schedule. If you went by the
schedule from the AO-27 web site when the satellite was operational in
the last few weeks, you might have heard the last minute or less of the
7-minute repeater time.
With the satellite off for the moment, there has been no update of the
AO-27 web site or messages from any of the AO-27 command stations
as to whether or not the satellite can be returned to operation. Last time
this happened, in late 2006 and early 2007, it took a few months to get
things working again.
BTW thanks for the VO-52 QSO last Friday. You were the first station I
worked from the convention I attended. My QSL card is on its way.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 7
Date: Thu, 18 Sep 2008 21:01:50 -0400
From: "Mr Jeffrey L Ross" <radiooperator(AT)comcast.net>
Subject: [amsat-bb] OLPC ONE LAPTOP PER CHILD
To: "amsat" <amsat-bb(AT)amsat.org>
Message-ID: <6C3A46E858694B819A5F457EEF527056(AT)hamshackcomputer>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi folks, thought I would drop in here that I just seen where they are going
to place windows xp in the next OLPC"S.. Wonder if we can get the update/OS
Installed on ours that we have. Anyway good luck on using your OLPC for
packet, telnet, tnc,s. glad to get them working for us.Now if my son will
just let me use it more. hi hi
kc8gkf
------------------------------
Message: 8
Date: Fri, 19 Sep 2008 03:28:15 -0400
From: "Frank H. Bauer" <ka3hdo(AT)comcast.net>
Subject: [amsat-bb] Richard Garriott on ISS
To: <amsat-bb(AT)amsat.org>
Message-ID: <000a01c91a29$479a84e0$6400a8c0(AT)hq.nasa.gov>
Content-Type: text/plain; charset="iso-8859-1"
September 18, 2008
Silver Spring, Maryland
Richard Garriott, W5KWQ, to communicate with Students and Ham Radio
Operators World-wide through the Amateur Radio Station on-board the
International Space Station (ISS)
Through multiple agreements with NASA, the Russian Space Agency, RSC
Energia, Space Adventures Ltd, and ARISS (Amateur Radio on the International
Space Station), Richard Garriott will fly to ISS and will communicate with
students, ham radio operators, friends, and family world-wide using the
ARISS amateur radio station on-board the ISS.
Richard Garriott, with the amateur radio callsign, W5KWQ is the sixth
private citizen to be flown by the Russian space agency to the ISS. A
legendary video game programmer and designer, Garriott will be traveling to
orbit this October and will speak with hundreds of students while thousands
more listen in during a series of ten-minute ham radio contacts. His
on-orbit stay on Soyuz and ISS is planned for October 12 ? 22, 2008.
The locales for the worldwide student contacts include eight Challenger
Learning Centers in the U.S., the Austin Liberal Arts and Sciences Academy
in Austin, Texas, the Pinehurst School in Ashland, Oregon, the Budbrooke
School in the U.K., and the National Space Challenge in Kuala Lumpur,
Malaysia. Garriott also plans to have random chats with scouts world-wide
as part of the amateur radio ?Jamboree on the Air? which is planned for
October 18-19.
?An important aspect of Richard Garriott?s mission is to encourage
students? interest in science and technology through the amateur radio
contacts,? said Rosalie White, ARISS International Secretary-Treasurer and
ARISS Program Manager for ARRL (American Radio Relay League). ?ARISS team
members from all over the world volunteer their time every day so that
students receive opportunities that we hope will cause them to study harder
and learn more about any educational subject.?
The connection from the ISS to individual student locations will be
established through an amateur radio station set up directly at the school
or through the ARISS network of worldwide amateur radio ground stations
utilized to link Garriott directly with students. The amateur radio system
works similar to the way mission control centers in the United States and
Russia talk to their space explorers.
To date, the ARISS international working group volunteer team has conducted
over 360 school contacts with crew members using ham radio on the ISS. The
team has also set up radio contacts for family members of space explorers
via ham radio. And have enabled countless contacts between the ISS crew
members and hams on the ground. All previous Space Adventures private
citizens who have flown to ISS have used the ARISS equipment to talk to
school students, ham radio operators and friends and family.
As part of Richard Garriott?s science investigations, he will be taking high
definition photographs of many parts of the Earth and comparing them to
photos taken on previous space missions. In conjunction with his Earth
science investigation, Mr. Garriott is flying special amateur radio
electronics that will enable him to send and receive low resolution images
from space, comparable to cell phone images. Through this ham radio system,
called Slow-Scan Television (SSTV), Garriott will beam down images of the
Earth to schools and ham radio operators on the ground so that they can
actively participate in his mission.
Frank Bauer, KA3HDO, ARISS International Chairman and AMSAT Vice President
for Human Spaceflight Programs, states: ?The ARISS team is quite excited
about Richard?s flight. He is very interested in bringing the wonders of
space to those of us on Earth and he sees amateur radio as a great mechanism
to make that happen. Through his school and scout voice contacts, his SSTV
image downlinks and his communications with the world-wide amateur radio
community, we see his mission as being ?action packed? from an amateur radio
perspective.? Bauer continues, ?What is extra special is that Richard
Garriott?s flight coincides almost 25 years from when his father, Owen
Garriott, made history as the first ham radio operator to communicate with
radio amateurs from space on the STS-9 Space Shuttle mission.? Owen
Garriott?s call sign is W5LFL. Richard also hopes to link up with his
father via amateur radio during his flight.
Currently, Mr. Garriott is finishing his final spaceflight preparations at
the Gagarin Cosmonaut Training Centre (GCTC) located in Star City, Russia.
His launch date is scheduled for October 12, 2008, with ISS docking planned
for October 14 and undocking planned for October 22. Mr. Garriott was
trained thoroughly to be a member of the Soyuz TMA-13/17S crew.
Since its first flight with Owen Garriott, in November 1983, Ham Radio has
flown on more than two-dozen space shuttle missions, on the Mir Space
Station and on the ISS. ARISS is the first and longest continuous operating
educational outreach program to fly on the ISS. ARISS is an
internationally-based working group, sponsored by the national amateur radio
organizations and the international AMSAT (Radio Amateur Satellite
Corporation) organizations from each country as well as the ISS space agency
partners. In the United States, ARISS is sponsored by the American Radio
Relay League (ARRL), the Radio Amateur Satellite Corporation-North America
(AMSAT-NA) and the National Aeronautics and Space Administration (NASA).
NASA?s education office provides support to ARISS and guidance in the
development of ARISS educational objectives.
The primary purpose of ARISS is to allow students engaged in a science and
technology curriculum to speak with an astronaut orbiting the Earth on the
International Space Station. Using amateur radio, students ask questions
about life in space or other space-related topics. Students fully
participate in the ARISS contact by helping set up an amateur radio ground
station at the school and then using that station to talk directly with the
on-board crew member. Preparation for the experience motivates the
children to learn about radio waves, space technology, science, geography
and the space environment. In many cases, the students help write press
releases and give presentations on the contact to their fellow students and
to the local community. Through this hands-on experience, students are
engaged and educated in the Science, Technology, Engineering and Mathematics
(STEM) fields, and are inspired to pursue STEM-related careers.
For more information about amateur radio on the ISS and Richard Garriott?s
flight, go to:
http://www.ariss.org
http://richardinspace.com
http://spaceadventures.com
http://www.arrl.org
http://www.amsat.org
http://www.spaceflight.nasa.gov/station/reference/radio/index.html
http://dln.nasa.gov/dln/content/catalog/details/?cid=634
http://www.nasa.gov/mission_pages/station/science/experiments/ARISS.html
Scout Jamboree on the Air:
http://www.scout.org/jota
----------------------------
Frank H. Bauer, KA3HDO
AMSAT-NA V.P. for Human Spaceflight Programs
ARISS International Chairman
------------------------------
Message: 9
Date: Fri, 19 Sep 2008 03:59:08 EDT
From: GW1FKY(AT)aol.com
Subject: [amsat-bb] Re: OLPC ONE LAPTOP PER CHILD
To: radiooperator(AT)comcast.net, amsat-bb(AT)amsat.org
Message-ID: <d36.2d686ee9.3604b5cc(AT)aol.com>
Content-Type: text/plain; charset="ISO-8859-1"
Hi ,
If they are the same Laptops that you are referring to they are now on sale
over in the UK.
They are notebook computers are produced by a company "HCL" and the
operating system Windows XP.
The UK distributor is a company that can be found at www,stirling house
.co.uk
1520 London Road,
Leigh on Sea,
Essex
SS9 2UR.
They selling at a price of ?179.99 ( UK) but of course carriage to the USA
might put the price out of range.
The package includes a Window XP CD and another with additional drivers, it
does not have a CD or
DVD built in so one would have to use an external device using the USB port.
Cheers
Ken Eaton
GW1FKY
Amsat -UK
Amsat NA
------------------------------
Message: 10
Date: Fri, 19 Sep 2008 08:58:50 -0400
From: "Tim Tapio" <tim(AT)timtapio.com>
Subject: [amsat-bb] Polarity questions
To: <amsat-bb(AT)amsat.org>
Message-ID: <002d01c91a57$770f7b30$652e7190$(AT)com>
Content-Type: text/plain; charset="us-ascii"
Hi,
How much signal reduction is there as the result of having the wrong
circular polarization?
I'm looking at M2 circular antennas for the 70cm downlink, it's another $200
for the switching to change polarity (woo hoo).
73 de Tim, K4SHF
------------------------------
Message: 11
Date: Fri, 19 Sep 2008 06:32:01 -0800
From: Edward Cole <kl7uw(AT)acsalaska.net>
Subject: [amsat-bb] Re: Polarity questions
To: "Tim Tapio" <tim(AT)timtapio.com>, <amsat-bb(AT)amsat.org>
Message-ID: <200809191432.m8JEW1dn060446(AT)iris.acsalaska.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Roughly 20-dB, assuming the signal is pure circular polarization. If
it is linear, then -3 dB.
73, Ed
At 04:58 AM 9/19/2008, Tim Tapio wrote:
>Hi,
>
>How much signal reduction is there as the result of having the wrong
>circular polarization?
>I'm looking at M2 circular antennas for the 70cm downlink, it's another $200
>for the switching to change polarity (woo hoo).
>
>73 de Tim, K4SHF
>
>
>
>
>_______________________________________________
>Sent via AMSAT-BB(AT)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
------------------------------
Message: 12
Date: Fri, 19 Sep 2008 10:41:27 -0400
From: Sebastian <w4as(AT)bellsouth.net>
Subject: [amsat-bb] Re: Polarity questions
To: AMSAT BB <AMSAT-BB(AT)amsat.org>
Message-ID: <19A44F8A-121E-4E53-9561-A62F38987355(AT)bellsouth.net>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
Tim, let me tell you my experience. I use the old Cushcraft AOP-1
antennas. 10x2 elements on 2 meters, and 8x2 on 440.
I have them in an X pattern, and I can hear and transmit to the birds
pretty much throughout the entire pass.
These antennas are old, and were designed during the days of AO-10 &
AO-13. But I have restored them, and they still work great for me
today (except for DO-64). It amazes me that I can drop my output to 5
watts and still hear myself loud and clear on AO-7 as it gets close to
LOS.
I would concentrate most of all on good quality coax. I use LMR400,
about 80 feet of it, with a TS-2000. I don't use a preamp and my
antennas are up about 25 feet and I have a blast!
73 de W4AS
Sebastian
On Sep 19, 2008, at 8:58 AM, Tim Tapio wrote:
> Hi,
>
> How much signal reduction is there as the result of having the wrong
> circular polarization?
> I'm looking at M2 circular antennas for the 70cm downlink, it's
> another $200
> for the switching to change polarity (woo hoo).
>
> 73 de Tim, K4SHF
------------------------------
Message: 13
Date: Fri, 19 Sep 2008 09:58:04 -0500
From: Ryan Butler <rbutler(AT)tsss.org>
Subject: [amsat-bb] Re: Polarity questions
To: Tim Tapio <tim(AT)timtapio.com>
Cc: amsat-bb(AT)amsat.org
Message-ID: <48D3BDFC.2050103(AT)tsss.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Tim Tapio wrote:
> Hi,
>
> How much signal reduction is there as the result of having the wrong
> circular polarization?
> I'm looking at M2 circular antennas for the 70cm downlink, it's another $200
> for the switching to change polarity (woo hoo).
>
> 73 de Tim, K4SHF
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
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The difference between RHCP and LHCP is 20 dB
The difference between Horizontal and Vertical Linear is 20 dB
The difference between (RHCP or LHCP) and (Horizontal or Vertical) is 3 dB
Ryan, NF0T
------------------------------
Message: 14
Date: Fri, 19 Sep 2008 15:29:13 +0100
From: "Angus" <angus(AT)young5769.freeserve.co.uk>
Subject: [amsat-bb] Re: Polarity questions
To: <AMSAT-BB(AT)amsat.org>
Message-ID: <9813F69B8F43444398264E734B9E1026(AT)GusPC>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
if the satellite is running RHCP and you have LHCP the VHF/UHF Manual
handbook says 20 -30dB which is a lot!
having spent ages getting a homebrew polarity control box to work just
right, I can honestly say it was well worth the effort!
regards
Gus M0IKB
----- Original Message -----
From: "Tim Tapio" <tim(AT)timtapio.com>
To: <amsat-bb(AT)amsat.org>
Sent: Friday, September 19, 2008 1:58 PM
Subject: [amsat-bb] Polarity questions
>
> Hi,
>
> How much signal reduction is there as the result of having the wrong
> circular polarization?
> I'm looking at M2 circular antennas for the 70cm downlink, it's another
> $200
> for the switching to change polarity (woo hoo).
>
> 73 de Tim, K4SHF
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)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
>
------------------------------
Message: 15
Date: Fri, 19 Sep 2008 09:34:30 -0700 (PDT)
From: Jim Jerzycke <kq6ea(AT)pacbell.net>
Subject: [amsat-bb] Re: Polarity questions
To: amsat-bb(AT)amsat.org, Tim Tapio <tim(AT)timtapio.com>
Message-ID: <150107.75778.qm(AT)web80604.mail.mud.yahoo.com>
Content-Type: text/plain; charset=us-ascii
Theoretically, it's 'infinite', but out in the real world, expect around
20~25dB loss from being completely cross-polarized. When I was doing
commercial satellite work, if we could get 26~27dB we were happy, but this was
with rigidly controlled satellites and commercial ground stations.
Between linear and circular, expect about 3dB loss.
Jim KQ6EA
--- On Fri, 9/19/08, Tim Tapio <tim(AT)timtapio.com> wrote:
> From: Tim Tapio <tim(AT)timtapio.com>
> Subject: [amsat-bb] Polarity questions
> To: amsat-bb(AT)amsat.org
> Date: Friday, September 19, 2008, 5:58 AM
> Hi,
>
> How much signal reduction is there as the result of having
> the wrong
> circular polarization?
> I'm looking at M2 circular antennas for the 70cm
> downlink, it's another $200
> for the switching to change polarity (woo hoo).
>
> 73 de Tim, K4SHF
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)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(AT)amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 3, Issue 471
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