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CX2SA > SATDIG 02.03.17 18:41l 967 Lines 30746 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Upcoming ARISS Contact Schedule as of 2017-03-02 07:00 UTC
(AJ9N@xxx.xxxx
2. Re: Still trying to decode NO-84 (Robert Bruninga)
3. Nayif-1 (Red Willoughby)
4. Re: Nayif-1 (Alan)
5. Re: Nayif-1 (Red Willoughby)
6. APRStk ? Or other? (Dave)
7. Re: Still trying to decode NO-84 (Fer)
8. Re: Still trying to decode NO-84 (Doppler) (Robert Bruninga)
9. Re: APRStk ? Or other? (Scott)
10. Re: APRStk ? Or other? (Mike Thompson)
11. Re: APRStk ? Or other? (Scott)
12. Re: Still trying to decode NO-84 (Doppler) (Robert Bruninga)
----------------------------------------------------------------------
Message: 1
Date: Thu, 2 Mar 2017 02:34:37 -0500
From: AJ9N@xxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Upcoming ARISS Contact Schedule as of 2017-03-02
07:00 UTC
Message-ID: <d54f61.763c4c05.45e9250d@xxx.xxx>
Content-Type: text/plain; charset="UTF-8"
Upcoming ARISS Contact Schedule as of 2017-03-02 07:00 UTC
Quick list of scheduled contacts and events:
Ecole Albert Camus, Rueil-Malmaison, France, College Marcel Pagnol,
Rueil-Malmaison, France, and Ecole ?Robespierre B.?, Rueil-Malmaison, France,
direct via F6KFA
The ISS callsign is presently scheduled to be FX?ISS
The scheduled astronaut is Thomas Pesquet KG5FYG
Contact was successful: Wed 2017-03-01 08:04:44 UTC 77 deg (***)
Student Space Technology Association, Knoxville, TN, direct via AA4UT
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Shane Kimbrough KE5HOD
Contact postponed (***)
Blair Pointe Upper Elementary School, Peru, IN, direct via WD9GIU
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Shane Kimbrough KE5HOD
Contact is a go for: Thu 2017-03-09 15:21:33 UTC 80 deg
3rd Junior High School, Komotini, Greece, direct via SV7APQ
The ISS callsign is presently scheduled to be OR4ISS
The scheduled astronaut is Shane Kimbrough KE5HOD
Contact is a go for: Fri 2017-03-10 08:20:46 UTC 28 deg
****************************************************************************
**
ARISS is always glad to receive listener reports for the above contacts.
ARISS thanks everyone in advance for their assistance. Feel free to send
your reports to aj9n@xxxxx.xxx or aj9n@xxx.xxx.
****************************************************************************
***
Message to US Educators
Amateur Radio on the International Space Station
Contact Opportunity
Call for Proposals
Proposal Window February 15 ? April 15, 2017
The Amateur Radio on the International Space Station (ARISS) Program is
seeking formal and informal education institutions and organizations,
individually or working together, to host an Amateur Radio contact with a
crew
member on board the ISS. ARISS anticipates that the contact would be held
between January 1, 2018 and June 30, 2018. Crew scheduling and ISS orbits
will
determine the exact contact dates. To maximize these radio contact
opportunities, ARISS is looking for organizations that will draw large
numbers of
participants and integrate the contact into a well-developed education
plan.
The deadline to submit a proposal is April 15, 2017. Proposal information
and documents can be found at www.arrl.org/hosting-an-ariss-contact.
The Opportunity
Crew members aboard the International Space Station will participate in
scheduled Amateur Radio contacts. These radio contacts are approximately 10
minutes in length and allow students to interact with the astronauts through
a question-and-answer session.
An ARISS contact is a voice-only communication opportunity via Amateur
Radio between astronauts and cosmonauts aboard the space station and
classrooms and communities. ARISS contacts afford education audiences the
opportunity to learn firsthand from astronauts what it is like to live and
work in
space and to learn about space research conducted on the ISS. Students also
will have an opportunity to learn about satellite communication, wireless
technology, and radio science. Because of the nature of human spaceflight and
the complexity of scheduling activities aboard the ISS, organizations must
demonstrate flexibility to accommodate changes in dates and times of the
radio contact.
Amateur Radio organizations around the world, NASA, and space agencies in
Russia, Canada, Japan and Europe sponsor this educational opportunity by
providing the equipment and operational support to enable direct
communication between crew on the ISS and students around the world via
Amateur Radio.
In the US, the program is managed by AMSAT (Radio Amateur Satellite
Corporation) and ARRL (American Radio Relay League) in partnership with
NASA and
CASIS (Center for the Advancement of Science in Space).
More Information
Interested parties can find more information about the program at
www.ariss.org and www.arrl.org/ARISS.
For proposal information and more details such as expectations, proposal
guidelines and proposal form, and dates and times of Information Sessions go
to http://www.arrl.org/hosting-an-ariss-contact.
Please direct any questions to ariss@xxxx.xxx.
********************************************
***********************************
ARISS is always glad to receive listener reports for the above contacts.
ARISS thanks everyone in advance for their assistance. Feel free to send
your reports to aj9n@xxxxx.xxx or aj9n@xxx.xxx.
Listen for the ISS on the downlink of 145.8? MHz.
****************************************************************************
***
All ARISS contacts are made via the Kenwood radio unless otherwise noted.
****************************************************************************
***
Several of you have sent me emails asking about the RAC ARISS website and
not being able to get in. That has now been changed to
http://www.ariss.org/
Note that there are links to other ARISS websites from this site.
****************************************************************************
Looking for something new to do? How about receiving DATV from the ISS?
If interested, then please go to the ARISS-EU website for complete
details. Look for the buttons indicating Ham Video.
http://www.ariss-eu.org/
If you need some assistance, ARISS mentor Kerry N6IZW, might be able to
provide some insight. Contact Kerry at kbanke@xxxxxxxxx.xxx
****************************************************************************
ARISS congratulations the following mentors who have now mentored over 100
schools:
Satoshi 7M3TJZ with 123
Gaston ON4WF with 123
Francesco IK?WGF with 119
****************************************************************************
The webpages listed below were all reviewed for accuracy. Out of date
webpages were removed and new ones have been added. If there are
additional
ARISS websites I need to know about, please let me know.
Note, all times are approximate. It is recommended that you do your own
orbital prediction or start listening about 10 minutes before the listed
time.
All dates and times listed follow International Standard ISO 8601 date and
time format YYYY-MM-DD HH:MM:SS
The complete schedule page has been updated as of 2017-03-02 07:00 UTC.
(***)
Here you will find a listing of all scheduled school contacts, and
questions, other ISS related websites, IRLP and Echolink websites, and
instructions for any contact that may be streamed live.
http://www.amsat.org/amsat/ariss/news/arissnews.rtf
http://www.amsat.org/amsat/ariss/news/arissnews.txt
Total number of ARISS ISS to earth school events is 1123. (***)
Each school counts as 1 event.
Total number of ARISS ISS to earth school contacts is 1084. (***)
Each contact may have multiple schools sharing the same time slot.
Total number of ARISS supported terrestrial contacts is 47.
A complete year by year breakdown of the contacts may be found in the
file.
http://www.amsat.org/amsat/ariss/news/arissnews.rtf
Please feel free to contact me if more detailed statistics are needed.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The following US states and entities have never had an ARISS contact:
Arkansas, Delaware, South Dakota, Wyoming, American Samoa, Guam, Northern
Marianas Islands, and the Virgin Islands.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
QSL information may be found at:
http://www.ariss.org/qsl-cards.html
ISS callsigns: DP?ISS, IR?ISS, NA1SS, OR4ISS, RS?ISS
****************************************************************************
The successful school list has been updated as of 2017-03-02 07:00 UTC.
(***)
http://www.amsat.org/amsat/ariss/news/Successful_ARISS_schools.rtf
Frequency chart for packet, voice, and crossband repeater modes showing
Doppler correction as of 2005-07-29 04:00 UTC
http://www.amsat.org/amsat/ariss/news/ISS_frequencies_and_Doppler_correction
.rtf
Listing of ARISS related magazine articles as of 2006-07-10 03:30 UTC.
http://www.amsat.org/amsat/ariss/news/ARISS_magazine_articles.rtf
Check out the Zoho reports of the ARISS contacts
https://reports.zoho.com/ZDBDataSheetView.cc?DBID=412218000000020415
****************************************************************************
Exp. 49 on orbit
Shane Kimbrough KE5HOD
Andrei Borisenko
Sergey Ryzhikov
Exp. 50 on orbit
Peggy Whitson
Thomas Pesquet KG5FYG
Oleg Novitskiy
****************************************************************************
73,
Charlie Sufana AJ9N
One of the ARISS operation team mentors
------------------------------
Message: 2
Date: Thu, 2 Mar 2017 09:37:43 -0500
From: Robert Bruninga <bruninga@xxxx.xxx>
To: Paul Stoetzer <n8hm@xxxx.xxx>, Mark Lunday <wd4elg@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Still trying to decode NO-84
Message-ID: <c995a77ab96504c170d99e0f81fc601a@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I saw his "bear claw" trace. It appears to be a carrier and 3+/-
sidebands every 360 Hz or so. I suspect this is some other modulation
method that uses 7 subcariers. bob
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Paul
Stoetzer
Sent: Wednesday, March 01, 2017 9:57 PM
To: Mark Lunday
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Still trying to decode NO-84
Mark,
Is your receiver set to FM mode for the downlink?
73,
Paul, N8HM
On Wed, Mar 1, 2017 at 9:35 PM, Mark Lunday <wd4elg@xxxxxxx.xxx> wrote:
> 0230 UTC pass, saw the bear claw PSK 31 waveform again. Anyone else
able to see the PSK dowllink? I am seeing 7 parallel traces, almost like
the transmission is overloading the receiver.
>
> Attempting to attach the file to this email with a capture of what my
SDR receiver is seeing...
>
> On a positive note, APRS is working perfectly on NO84 even at low
passes.
>
> Mark Lunday, WD4ELG
> Greensboro, NC FM06be
> wd4elg@xxxx.xxx
> http://wd4elg.blogspot.com
> SKCC #16439 FISTS #17972
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership.
> Opinions expressed are solely those of the author, and do not reflect
the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite
program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available to
all interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 3
Date: Thu, 2 Mar 2017 08:48:28 -0600
From: Red Willoughby <red@xxxxxxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Nayif-1
Message-ID: <c2488193-c039-f320-7caa-df139e683625@xxxxxxxxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8; format=flowed
I see it listed at the top of the colorful matrix on amsat.org/status,
but it does not seem to appear in the Select Satellite dropdown box for
posting reports. Am I just missing it or does it have another name?
------------------------------
Message: 4
Date: Thu, 2 Mar 2017 09:00:42 -0600
From: "Alan" <wa4sca@xxxxx.xxx>
To: "'Red Willoughby'" <red@xxxxxxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Nayif-1
Message-ID: <000001d29365$c382b9b0$4a882d10$@xxxxx.xxx>
The satellite formerly known as Nayif-1 is now EO-88.
73s,
Alan
WA4SCA
<-----Original Message-----
<From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Red
<Willoughby
<Sent: Thursday, March 02, 2017 08:48 AM
<To: amsat-bb@xxxxx.xxx
<Subject: [amsat-bb] Nayif-1
<
<I see it listed at the top of the colorful matrix on amsat.org/status,
<but it does not seem to appear in the Select Satellite dropdown box for
<posting reports. Am I just missing it or does it have another name?
<_______________________________________________
<Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
<to all interested persons worldwide without requiring membership. Opinions
<expressed
<are solely those of the author, and do not reflect the official views of
AMSAT-
<NA.
<Not an AMSAT-NA member? Join now to support the amateur satellite
<program!
<Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 5
Date: Thu, 2 Mar 2017 09:02:39 -0600
From: Red Willoughby <red@xxxxxxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Nayif-1
Message-ID: <7e961699-8a2e-33c1-37ad-6ef68e16e78a@xxxxxxxxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8; format=flowed
Thanks - I missed that announcement.
------------------------------
Message: 6
Date: Thu, 2 Mar 2017 14:57:37 +0000
From: Dave <dave4e@xxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] APRStk ? Or other?
Message-ID: <E7C02D62-F59F-4ED5-A500-A79732D50999@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi All
I'm setting up an autonomous sat gate using a spare Kenwood TMD700. I seem
to remember that once upon a time there was a DOS program called APRStk that
could Doppler correct the TMD700.
Does anyone know of a more up to date alternative that would run on a Pi or
Pi Zero?
Regards
Dave EI4HT / M0GIW
Sent from my iPhone
------------------------------
Message: 7
Date: Thu, 2 Mar 2017 15:24:31 +0000 (UTC)
From: Fer <mhz4464@xxxxx.xxx>
To: Mark Lunday <wd4elg@xxxxxxx.xxx>, AMSAT BB <amsat-bb@xxxxx.xxx>,
Paul Stoetzer <n8hm@xxxx.xxx>, Robert Bruninga <bruninga@xxxx.xxx>
Subject: Re: [amsat-bb] Still trying to decode NO-84
Message-ID: <995642683.430352.1488468271350@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I am trying too to activate NO-84, 50w on 28.120 MHz with vertical antenna
or dipole with FLDIGI (saw no difference, still weak), good downlink signal
on UHF with SDR-14+SpectraVue as panadapter at 10.7 MHz, beacon decoded in
FLDIGI, ? my weak signal ?sometime decoded, strong doppler on my signal
despite I correct both with orbitron/wispdde using only fresh keps and GPS
computer sync clock.
Any idea?73 Fer IW1DTU
here some screenshoot link to dropbox
https://www.dropbox.com/s/ec2i14l62u4ij3w/NO-84%202%20mar17%20uno.jpg?dl=0
https://www.dropbox.com/s/l1k3a3h8atyys5l/NO-84%202mar17%20due.jpg?dl=0
On Thursday, March 2, 2017 2:51 AM, Mark Lunday <wd4elg@xxxxxxx.xxx>
wrote:
0230 UTC pass, saw the bear claw PSK 31 waveform again.? Anyone else able
to see the PSK dowllink?? I am seeing 7 parallel traces, almost like the
transmission is overloading the receiver.
Attempting to attach the file to this email with a capture of what my SDR
receiver is seeing...
On a positive note, APRS is working perfectly on NO84 even at low passes.
Mark Lunday, WD4ELG
Greensboro, NC? FM06be
wd4elg@xxxx.xxx
http://wd4elg.blogspot.com
SKCC #16439? FISTS #17972
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 8
Date: Thu, 2 Mar 2017 10:38:50 -0500
From: Robert Bruninga <bruninga@xxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Still trying to decode NO-84 (Doppler)
Message-ID: <5325febaa8220c217fc7b8a782ff329d@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
One thing to remember is that you cannot use normal Doppler correcting
software that tunes the radio. The instantaneous radio steps cause Phase
discontinuities and that completely destroys PSK31.
The only ways to work well is to only try to decode when the bird is coming
right at you or right aways from you and the Doppler is not rapidly
changing.
*** OR *** use the special PSK31 Doppler uplink correcting program written
by Andy Flowers found on the PSAT web page? http://aprs.org/psat.html
Here is his page:
http://www.frontiernet.net/~aflowers/dopplerpsk/dopplerpsk.html
This software also allows you to run full duplex so that you can uplink
continuously throughtout the pass and independently receive all downlinks
at the same time. The radio does not tune, but your uplink audio
compensates for the uplink Doppler so that your trace in the downlink
appears constant to everyone.
Yes, you can run UHF Radio stepped Doppler correction that steps down in
the usual 5 KHz steps 4 times during the pass. You may still loose an
instant of phase corrupted characters, but only 4 times, not every few
seconds as the SSB radio would try to do if the computer program was trying
to compensate the SSB uplink radio.
That help?
Bob
*From:* Fer [mailto:mhz4464@xxxxx.xxxx
*Sent:* Thursday, March 02, 2017 10:25 AM
*To:* Mark Lunday; AMSAT BB; Paul Stoetzer; Robert Bruninga
*Subject:* Re: [amsat-bb] Still trying to decode NO-84
I am trying too to activate NO-84, 50w on 28.120 MHz with vertical antenna
or dipole with FLDIGI (saw no difference, still weak), good downlink signal
on UHF with SDR-14+SpectraVue as panadapter at 10.7 MHz, beacon decoded in
FLDIGI, my weak signal sometime decoded, strong doppler on my signal
despite I correct both with orbitron/wispdde using only fresh keps and GPS
computer sync clock.
Any idea?
73 Fer IW1DTU
here some screenshoot link to dropbox
https://www.dropbox.com/s/ec2i14l62u4ij3w/NO-84%202%20mar17%20uno.jpg?dl=0
https://www.dropbox.com/s/l1k3a3h8atyys5l/NO-84%202mar17%20due.jpg?dl=0
On Thursday, March 2, 2017 2:51 AM, Mark Lunday <wd4elg@xxxxxxx.xxx> wrote:
0230 UTC pass, saw the bear claw PSK 31 waveform again. Anyone else able
to see the PSK dowllink? I am seeing 7 parallel traces, almost like the
transmission is overloading the receiver.
Attempting to attach the file to this email with a capture of what my SDR
receiver is seeing...
On a positive note, APRS is working perfectly on NO84 even at low passes.
Mark Lunday, WD4ELG
Greensboro, NC FM06be
wd4elg@xxxx.xxx
http://wd4elg.blogspot.com
SKCC #16439 FISTS #17972
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 9
Date: Thu, 2 Mar 2017 10:56:16 -0500
From: "Scott" <scott23192@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] APRStk ? Or other?
Message-ID: <234DB870B77C4C2C8F0CA09B47F4EDB8@xxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hey Dave.
It takes longer to read the instructions that it does to setup a Raspberry
Pi to be an iGate.
When the ISS digipeater changed to 70cm, there were not enough iGates so I
thought it might be fun to throw one together. There are numerous how-to's
online, but this one is perhaps the most straight-forward:
https://github.com/wb2osz/direwolf/blob/master/doc/Raspberry-Pi-SDR-IGate.pdf
... unfortunately, the way the document was created you won't be able to
copy/paste commands. But regardless, it's not a difficult process if you
have even the slightest familiarity with a Pi or linux in general.
Hope that helps!
-Scott, K4KDR
Montpelier, VA USA
------------------------------------------------------------------------------
--
-----Original Message-----
From: Dave via AMSAT-BB
Sent: Thursday, March 02, 2017 9:57 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] APRStk ? Or other?
Hi All
I'm setting up an autonomous sat gate using a spare Kenwood TMD700. I seem
to remember that once upon a time there was a DOS program called APRStk that
could Doppler correct the TMD700.
Does anyone know of a more up to date alternative that would run on a Pi or
Pi Zero?
Regards
Dave EI4HT / M0GIW
------------------------------
Message: 10
Date: Thu, 2 Mar 2017 10:01:54 -0600
From: Mike Thompson <zryder94@xxxxx.xxx>
To: Scott <scott23192@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] APRStk ? Or other?
Message-ID:
<CAGD5MUGjJi=FmnypFUWaSVQg3p8vE12ym5G2KnJvh0PwSxUN0A@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I wonder how hard it would be to get the raspberry pi to download TLE's
every now and then, and apply doppler correction to the downlink iGate
frequency. on 70cm, this might be a big deal.
On Thu, Mar 2, 2017 at 9:56 AM, Scott <scott23192@xxxxx.xxx> wrote:
> Hey Dave.
>
> It takes longer to read the instructions that it does to setup a Raspberry
> Pi to be an iGate.
>
> When the ISS digipeater changed to 70cm, there were not enough iGates so I
> thought it might be fun to throw one together. There are numerous how-to's
> online, but this one is perhaps the most straight-forward:
>
> https://github.com/wb2osz/direwolf/blob/master/doc/Raspberry
> -Pi-SDR-IGate.pdf
>
> ... unfortunately, the way the document was created you won't be able to
> copy/paste commands. But regardless, it's not a difficult process if you
> have even the slightest familiarity with a Pi or linux in general.
>
> Hope that helps!
>
> -Scott, K4KDR
> Montpelier, VA USA
>
>
>
> ------------------------------------------------------------
> --------------------
>
> -----Original Message----- From: Dave via AMSAT-BB
> Sent: Thursday, March 02, 2017 9:57 AM
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] APRStk ? Or other?
>
> Hi All
>
> I'm setting up an autonomous sat gate using a spare Kenwood TMD700. I seem
> to remember that once upon a time there was a DOS program called APRStk
> that could Doppler correct the TMD700.
>
> Does anyone know of a more up to date alternative that would run on a Pi
> or Pi Zero?
>
> Regards
> Dave EI4HT / M0GIW
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 11
Date: Thu, 2 Mar 2017 11:08:23 -0500
From: "Scott" <scott23192@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] APRStk ? Or other?
Message-ID: <84105789587F4447B1493A00230657B6@xxxxxxx>
Content-Type: text/plain; charset="utf-8"
I was also concerned about that at first but on most passes I log a
significant number of packet receptions, so while adjusting for RX doppler
might help to some degree, it?s definitely not a deal-breaker.
(I also learned not to judge your effectiveness by the number of packets you
iGate to ariss.net; it appears that duplicates only show up once. So, to
REALLY know how well you?re doing, check the log file on the iGate or use an
external app to monitor it on another PC)
-Scott
------------------------------------------------------------------------------
--
From: Mike Thompson
Sent: Thursday, March 02, 2017 11:01 AM
To: Scott
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] APRStk ? Or other?
I wonder how hard it would be to get the raspberry pi to download TLE's
every now and then, and apply doppler correction to the downlink iGate
frequency. on 70cm, this might be a big deal.
On Thu, Mar 2, 2017 at 9:56 AM, Scott <scott23192@xxxxx.xxx> wrote:
Hey Dave.
It takes longer to read the instructions that it does to setup a Raspberry
Pi to be an iGate.
When the ISS digipeater changed to 70cm, there were not enough iGates so I
thought it might be fun to throw one together. There are numerous how-to's
online, but this one is perhaps the most straight-forward:
https://github.com/wb2osz/direwolf/blob/master/doc/Raspberry-Pi-SDR-IGate.pdf
... unfortunately, the way the document was created you won't be able to
copy/paste commands. But regardless, it's not a difficult process if you
have even the slightest familiarity with a Pi or linux in general.
Hope that helps!
-Scott, K4KDR
Montpelier, VA USA
------------------------------------------------------------------------------
--
-----Original Message----- From: Dave via AMSAT-BB
Sent: Thursday, March 02, 2017 9:57 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] APRStk ? Or other?
Hi All
I'm setting up an autonomous sat gate using a spare Kenwood TMD700. I seem
to remember that once upon a time there was a DOS program called APRStk that
could Doppler correct the TMD700.
Does anyone know of a more up to date alternative that would run on a Pi
or Pi Zero?
Regards
Dave EI4HT / M0GIW
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Message: 12
Date: Thu, 2 Mar 2017 11:30:19 -0500
From: Robert Bruninga <bruninga@xxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Still trying to decode NO-84 (Doppler)
Message-ID: <e8b729412af8575c9dc2cbb01954cbbc@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I just updated the http://aprs.org/psat.html web page to clarify how PSK31
uplink and downlink should be approached. We should have done that a year
ago!
Bob, WB4APR
*From:* Robert Bruninga [mailto:bruninga@xxxx.xxxx
*Sent:* Thursday, March 02, 2017 10:39 AM
*To:* AMSAT BB
*Cc:* Robert Bruninga
*Subject:* RE: [amsat-bb] Still trying to decode NO-84 (Doppler)
One thing to remember is that you cannot use normal Doppler correcting
software that tunes the radio. The instantaneous radio steps cause Phase
discontinuities and that completely destroys PSK31.
The only ways to work well is to only try to decode when the bird is coming
right at you or right aways from you and the Doppler is not rapidly
changing.
*** OR *** use the special PSK31 Doppler uplink correcting program written
by Andy Flowers found on the PSAT web page? http://aprs.org/psat.html
Here is his page:
http://www.frontiernet.net/~aflowers/dopplerpsk/dopplerpsk.html
This software also allows you to run full duplex so that you can uplink
continuously throughtout the pass and independently receive all downlinks
at the same time. The radio does not tune, but your uplink audio
compensates for the uplink Doppler so that your trace in the downlink
appears constant to everyone.
Yes, you can run UHF Radio stepped Doppler correction that steps down in
the usual 5 KHz steps 4 times during the pass. You may still loose an
instant of phase corrupted characters, but only 4 times, not every few
seconds as the SSB radio would try to do if the computer program was trying
to compensate the SSB uplink radio.
That help?
Bob
*From:* Fer [mailto:mhz4464@xxxxx.xxxx
*Sent:* Thursday, March 02, 2017 10:25 AM
*To:* Mark Lunday; AMSAT BB; Paul Stoetzer; Robert Bruninga
*Subject:* Re: [amsat-bb] Still trying to decode NO-84
I am trying too to activate NO-84, 50w on 28.120 MHz with vertical antenna
or dipole with FLDIGI (saw no difference, still weak), good downlink signal
on UHF with SDR-14+SpectraVue as panadapter at 10.7 MHz, beacon decoded in
FLDIGI, my weak signal sometime decoded, strong doppler on my signal
despite I correct both with orbitron/wispdde using only fresh keps and GPS
computer sync clock.
Any idea?
73 Fer IW1DTU
here some screenshoot link to dropbox
https://www.dropbox.com/s/ec2i14l62u4ij3w/NO-84%202%20mar17%20uno.jpg?dl=0
https://www.dropbox.com/s/l1k3a3h8atyys5l/NO-84%202mar17%20due.jpg?dl=0
On Thursday, March 2, 2017 2:51 AM, Mark Lunday <wd4elg@xxxxxxx.xxx> wrote:
0230 UTC pass, saw the bear claw PSK 31 waveform again. Anyone else able
to see the PSK dowllink? I am seeing 7 parallel traces, almost like the
transmission is overloading the receiver.
Attempting to attach the file to this email with a capture of what my SDR
receiver is seeing...
On a positive note, APRS is working perfectly on NO84 even at low passes.
Mark Lunday, WD4ELG
Greensboro, NC FM06be
wd4elg@xxxx.xxx
http://wd4elg.blogspot.com
SKCC #16439 FISTS #17972
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Subject: Digest Footer
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AMSAT-NA.
Not an AMSAT member? Join now to support the amateur satellite program!
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End of AMSAT-BB Digest, Vol 12, Issue 59
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