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CX2SA > SATDIG 01.04.18 10:35l 911 Lines 30176 Bytes #999 (0) @ WW
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Read: GUEST
Subj: AMSAT-BB-digest V13 124
Path: IW8PGT<IR2UBX<SR1BSZ<SV1CMG<ON0AR<OZ5BBS<CX2SA
Sent: 180401/0827Z @:CX2SA.SAL.URY.SOAM #:39137 [Salto] FBB7.00e $:AMSATBB13124
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: [aprssig] Tiangong Re-entry on Heavens bove (Greg D)
2. Re: FoxTelem Java question (Chris Thompson)
3. Re: Tiangong Re-entry on Heavens bove (Ted Krempa)
4. Re: Tiangong Re-entry on Heavens above (Ted Krempa)
5. AO-92 L-band ON 0157utc 31 March 2018 (Mark L. Hammond)
6. Re: [aprssig] Tiangong Re-entry on Heavens bove
(Peter Laws N5UWY)
7. Re: :Re: Any amateur satellites above 70cm band (microwave
bands) ? (John Brier)
8. ANS-091 AMSAT News Service Weekly Bulletins (Lee McLamb)
9. Re: CTCSS Sat Tone Operation (Kevin M)
10. Re: CTCSS Sat Tone Operation (Kevin M)
11. Fwd: Polluted time server causing issues with digital modes
(Brad WF7T)
12. cube sat question (Nick Pugh)
----------------------------------------------------------------------
Message: 1
Date: Sat, 31 Mar 2018 18:41:54 -0700
From: Greg D <ko6th.greg@?????.???>
To: amsat bb <amsat-bb@?????.???>
Cc: TAPR APRS Mailing List <aprssig@????.???>
Subject: Re: [amsat-bb] [aprssig] Tiangong Re-entry on Heavens bove
Message-ID: <d1cce2a7-9b9f-796c-b910-f15cd2256ae3@?????.???>
Content-Type: text/plain; charset=utf-8
Gpredict's database shows it as Catalog number 37820.
greg@?????????.???????????????????????> more 37820.sat
[Satellite]
VERSION=1.1
NAME=TIANGONG 1
NICKNAME=TIANGONG 1
TLE1=1 37820U 11053A 18090.75926316 .01965660 91360-5 17017-3 0 9993
TLE2=2 37820 42.7468 202.2368 0007442 358.3143 1.7378 16.38245761373833
STATUS=0
Greg KO6TH
Robert Bruninga wrote:
>> Hi Bob, do you know the object number by chance?
> No, but this link shows that the higher probabilities or re-entry are
> between about 38 to 43 degree latitudes north and south.
>
> https://www.theguardian.com/science/2018/mar/30/chinas-tiangong-1-space-st
> ation-will-crash-to-earth-this-weekend
>
> Im not sure why those would be slightly higher. 43 degrees is its maximum
> excursion (matches its inclination)... Maybe its because as it passes
> over the equatorial bulge, it sees the higher drag and that will start the
> demise which will occur then 20 minutes later?
>
> Bob
> -----Original Message-----
> From: Robert Bruninga
> Sent: Saturday, March 31, 2018 9:16 AM
> Subject: [amsat-bb] Tiangong Re-enetry on Heavens bove
>
> You can see the live track of Taengong to re-enter in the next 24 hours on
> http://www.heavens-above.com/
>
> Just remember, as it suffers increased drag, it will speed up and be ahead
> of classic predictions.
>
> But at least you can see when you are under the orbit as to whether it is
> worth going outside. I 'd go out several minutes before the prediction
> since we dont know how quickly they are updating the elements as it speeds
> up.
>
> and even if it is daytime, you will see it if it comes in in your area...
>
> Bob
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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
> _______________________________________________
> aprssig mailing list
> aprssig@????.???
> http://www.tapr.org/mailman/listinfo/aprssig
------------------------------
Message: 2
Date: Sun, 01 Apr 2018 01:52:21 +0000
From: Chris Thompson <chrisethompson@?????.???>
To: Peter Green <peteragreen@??.???>
Cc: AMSAT <AMSAT-BB@?????.???>
Subject: Re: [amsat-bb] FoxTelem Java question
Message-ID:
<CAJOf0+sA+yHVJ+8yj2Hr4ga4i4nf-0t=Q1EfCssJeK=HpXCRKw@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Hi Pete,
Glad you are running it on the Mac. The instructions are dated and related
to Apple's Java which was stuck at 1.6 and the only version that worked as
an App. If you run the Jar file directly or run it from a script it should
work fine with the latest Java release.
Chris
On Sat, Mar 31, 2018, 16:40 Peter Green <peteragreen@??.???> wrote:
> I?m new to receiving FoxTelem.
>
> I have it running on a Mac with a Funcube dongle.
>
> The Mac is running High Sierra 10.13.3 and Java 8 update 161.
>
> I have had some success with AO-85 and AO-91 but none with AO-92.
>
> The instruction manual says that I should use Java 6, however this is no
> longer available and not supported.
>
> Is it that the instructions are out of date, or can I acquire Java 6 form
> somewhere or is Java 8 OK?
>
> Every thing seems to work with the FoxTelem application (Ver 1.06q_m)
>
> Any hints or tips greatly appreciated.
>
> Many thanks
> Pete G0ABI
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: Sat, 31 Mar 2018 16:47:20 -0700
From: "Ted Krempa" <k7trkradio@???????.???>
To: "'Robert Bruninga'" <bruninga@????.???>, "'amsat bb'"
<amsat-bb@?????.???>
Cc: 'TAPR APRS Mailing List' <aprssig@????.???>
Subject: Re: [amsat-bb] Tiangong Re-entry on Heavens bove
Message-ID: <000301d3c94a$9caa5d90$d5ff18b0$@???????.???>
Content-Type: text/plain; charset="us-ascii"
Hi Bob, do you know the object number by chance?
Thanks
Ted
K7TRK
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of Robert
Bruninga
Sent: Saturday, March 31, 2018 9:16 AM
To: amsat bb
Cc: TAPR APRS Mailing List
Subject: [amsat-bb] Tiangong Re-enetry on Heavens bove
You can see the live track of Taengong to re-enter in the next 24 hours on
http://www.heavens-above.com/
Just remember, as it suffers increased drag, it will speed up and be ahead
of classic predictions.
But at least you can see when you are under the orbit as to whether it is
worth going outside. I 'd go out several minutes before the prediction
since we dont know how quickly they are updating the elements as it speeds
up.
and even if it is daytime, you will see it if it comes in in your area...
Bob
_______________________________________________
Sent via AMSAT-BB@?????.???. 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: 4
Date: Sat, 31 Mar 2018 18:52:42 -0700
From: "Ted Krempa" <k7trkradio@???????.???>
To: "'Robert Bruninga'" <bruninga@????.???>, "'amsat bb'"
<amsat-bb@?????.???>
Cc: 'TAPR APRS Mailing List' <aprssig@????.???>
Subject: Re: [amsat-bb] Tiangong Re-entry on Heavens above
Message-ID: <000d01d3c95c$212b33d0$63819b70$@???????.???>
Content-Type: text/plain; charset="us-ascii"
A much better representation of the object, IMHO, is found here:
http://www.n2yo.com/satellite/?s=37820#results
and the object number is 37820 according to this site
73, Ted
K7TRK
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of Robert
Bruninga
Sent: Saturday, March 31, 2018 5:55 PM
To: amsat bb
Cc: TAPR APRS Mailing List
Subject: Re: [amsat-bb] Tiangong Re-entry on Heavens bove
> Hi Bob, do you know the object number by chance?
No, but this link shows that the higher probabilities or re-entry are
between about 38 to 43 degree latitudes north and south.
https://www.theguardian.com/science/2018/mar/30/chinas-tiangong-1-space-st
ation-will-crash-to-earth-this-weekend
Im not sure why those would be slightly higher. 43 degrees is its maximum
excursion (matches its inclination)... Maybe its because as it passes over
the equatorial bulge, it sees the higher drag and that will start the demise
which will occur then 20 minutes later?
Bob
-----Original Message-----
From: Robert Bruninga
Sent: Saturday, March 31, 2018 9:16 AM
Subject: [amsat-bb] Tiangong Re-enetry on Heavens bove
You can see the live track of Taengong to re-enter in the next 24 hours on
http://www.heavens-above.com/
Just remember, as it suffers increased drag, it will speed up and be ahead
of classic predictions.
But at least you can see when you are under the orbit as to whether it is
worth going outside. I 'd go out several minutes before the prediction
since we dont know how quickly they are updating the elements as it speeds
up.
and even if it is daytime, you will see it if it comes in in your area...
Bob
_______________________________________________
Sent via AMSAT-BB@?????.???. 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@?????.???. 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: Sat, 31 Mar 2018 21:58:50 -0400
From: "Mark L. Hammond" <marklhammond@?????.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] AO-92 L-band ON 0157utc 31 March 2018
Message-ID: <Upyq1x00D4okgLP01pyq2a@?????.???>
Content-Type: text/plain; charset="us-ascii"
We're in L-band for about 24 hours. Enjoy!
73,
Mark L. Hammond [N8MH]
------------------------------
Message: 6
Date: Sat, 31 Mar 2018 21:58:22 -0500
From: Peter Laws N5UWY <n5uwy@????.???>
To: Robert Bruninga <bruninga@????.???>
Cc: TAPR APRS Mailing List <aprssig@????.???>, amsat bb
<amsat-bb@?????.???>
Subject: Re: [amsat-bb] [aprssig] Tiangong Re-entry on Heavens bove
Message-ID:
<CANVAiQ9-3wGiZKf3_NEhphR5q=EryqSfVV2BXrZGo-XQ5zVvXQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
On Sat, Mar 31, 2018 at 7:55 PM, Robert Bruninga <bruninga@????.???> wrote:
>> Hi Bob, do you know the object number by chance?
>
> No, but this link shows that the higher probabilities or re-entry are
> between about 38 to 43 degree latitudes north and south.
N2YO says:
COSPAR 2011-053A
NORAD 37820.
https://www.n2yo.com/info/?a=61
*cinches down tinfoil helmet*
--
Peter Laws | N5UWY | plaws plaws net | Travel by Train!
------------------------------
Message: 7
Date: Sat, 31 Mar 2018 23:17:44 -0400
From: John Brier <johnbrier@?????.???>
To: MICHAEL WILLIAMS <k9qho67622@???????.???>
Cc: Richard Ferryman <g4bbh@??????????.???>, AMSAT BB
<amsat-bb@?????.???>
Subject: Re: [amsat-bb] :Re: Any amateur satellites above 70cm band
(microwave bands) ?
Message-ID:
<CALn0fKPyM7sED6YqzPNPs-_AOtafxLxhB9JRqBxx=ZTTxDZX5g@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
FWIW they do turn off HamTV for space walks and also
docking/undockings. I think there is one experiment they do
occasionally that they have to turn it off for. But yes, other than
that, it's on all the time.
73, John Brier KG4AKV
On Sat, Mar 31, 2018 at 12:06 PM, MICHAEL WILLIAMS
<k9qho67622@???????.???> wrote:
> DTUSat-2 (object 40030) is operating at 2401.835 MHz sending a full or
partial beacon every 30 seconds. Since the Doppler is 100 KHz over the
entire pass, it's tricky copying it with a traditional receiver such as an
FT-847 (Doppler correction has to be right on). It's best seen with a SDR.
Since its batteries are dead, it signals cannot be heard in eclipse. Its in
an almost perfect polar orbit and can be copied around noon daily everywhere
on earth. It is listed in the AMSAT keps and pass predictions. Also see
http://wakky.asablo.jp/blog/
>
>
> Also, I've heard that the ISS sends out a very strong video carrier at
2395 MHz (my converter will not tune that low).
>
> I asked a ham in Italy to check it out and he indicated it is always on.
>
>
> I hope this helps.
>
>
> Mike (K9QHO)
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: Sat, 31 Mar 2018 23:37:51 -0400
From: Lee McLamb <kt4tz@???.??.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] ANS-091 AMSAT News Service Weekly Bulletins
Message-ID: <26c28412-33b5-9ca8-52c8-d1e83755efab@???.??.???>
Content-Type: text/plain; charset=utf-8; format=flowed
AMSAT NEWS SERVICE
ANS-091
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:
* AO-92 Operations Schedule
* Russian SSTV Transmission Events Planned
* AMSAT at the 2018 Hamvention -- Call for volunteers
* AMSAT-UK Call for Speakers for Colloquium 2018
* Upcoming ARISS Contact and Event Schedule
* Athenoxat-1 QSL Card Challenge
SB SAT @ AMSAT $ANS-091.01
ANS-091 AMSAT News Service Weekly Bulletins
AMSAT News Service Bulletin 091.01
?From AMSAT HQ KENSINGTON, MD.
DATE April 1, 2018
To All RADIO AMATEURS
BID: $ANS-091.01
AO-92 Operations Schedule
AO-92 operations are scheduled among the U/v FM repeater, L-Band
Downshifter,
Virginia Tech Camera, and the University of Iowa?s High Energy Radiation
CubeSat
Instrument (HERCI). Please keep the uplink clear during passes with
scheduled
mode changes.
For the week of 31Mar-6Apr 2018, the following mode changes are scheduled:
Approximately 0155UTC 1Apr we will enable the L band uplink for ~24 hours
Approximately 1650UTC 5Apr we will enable the VT camera and high-speed
data for
~40 minutes. Please be ready to copy high-speed data with FoxTelem, and
keep the
uplink clear at 1650UTC.
All other times the U/v repeater will be open continuously.
[ANS thanks Drew, KO4MA, for the above information]
---------------------------------------------------------------------
Russian SSTV Transmission Events Planned
ARISS Russia is planning Slow Scan Television (SSTV) transmissions from the
International Space Station. The transmissions are scheduled to occur over
Moscow on April 2, 2018 from 15:05 through 18:30 UTC and on April 3,
2018 from
14:15 through 18:40 UTC. The MAI-75 experiment uses a computer on the ISS
Russian Segment, which stores images that are then transmitted to Earth
using
the amateur radio, specifically the onboard Kenwood TM D710E
transceiver. Images
received can be posted and viewed at
http://www.spaceflightsoftware.com/ARISS_SSTV/index.php .The
transmissions will
be broadcast at 145.800 MHz using the PD-120 SSTV mode.
Please note that the event is dependent on other activities, schedules
and crew
responsibilities on the ISS and are subject to change at any time.
Please check for news and the most current information on the AMSAT.org and
ARISS.org websites, the AMSAT-BB@?????.???? the ARISS facebook at
Amateur Radio
On The International Space Station (ARISS) and ARISS twitter @????????????.
For more information, see www.ariss.org.
Also join us on Facebook:? Amateur Radio on the International Space Station
(ARISS)
Follow us on Twitter:? ARISS_status
[ANS thanks Dave, AA4KN, for the above information]
---------------------------------------------------------------------
AMSAT at the 2018 Hamvention -- Call for volunteers
The 2018 Hamvention will be held on May 18-20, 2018 at Greene County
Fairground and Expo Center in Xenia Ohio. Planning is under way for
AMSAT's participation!
Phil, W1EME, AMSAT's Hamvention Team Leader is looking for team
leaders to assist him. If you can help please consider leading in
one of the unfilled positions atw1eme at amsat.org <
http://www.amsat.org/mailman/listinfo/ans>
+ Volunteer Assistant
+ Publicity Assistant??? - JoAnne K9JKM
+ Forum Assistant??????? - Keith KB1SF
+ Sales Assistant
+ Outdoor Demo Assistant - Paul N8HM
+ Facilities and Setup Assistant
We need as many volunteers as possible to help staff the AMSAT
booth during the Hamvention Last year, we had about 40 people assist
with the AMSAT booth at the Hamvention.? It was the efforts of those
volunteers that made the 2017 Hamvention a success for AMSAT.
1. May 17 - Booth setup on Thursday.
2. May 18, 19, 20 - Staff the booth during Hamvention hours to
??? answer questions, enroll members, indoor demos, merchandise
??? and book sales. (We will train you!)
3. May 20 - Booth teardown on Sunday
The interaction with AMSAT members, satellite operators, designers,
and builders makes the whole experience a lot of fun.
Whether you're available for only a couple of hours or if you can
spend the entire weekend with us, your help would be greatly
appreciated.
Interested hams should contact Team Leader Phil Smith via email at:
w1eme at amsat.org <http://www.amsat.org/mailman/listinfo/ans> for
information.
[ANS thanks AMSAT Hamvention Publicity Assistant JoAnne Maenpaa,
? K9JKM for the above information]
---------------------------------------------------------------------
AMSAT-UK Call for Speakers for Colloquium 2018
This is a call for speakers for the AMSAT-UK International Space
Colloquium 2018
which, will be held this year on 13-14 October, in conjunction with the
RSGB
Convention at Kents Hill Park Conference Centre, Milton Keynes, MK7 6BZ,
United
Kingdom .
AMSAT-UK invites speakers, to cover topics about Amateur satellites,
CubeSats,
Nanosats, space and associated activities, for this event.
They are also invited to submit papers for subsequent publishing on the
AMSAT-UK
web site or in Oscar News.
We appreciate that it is not always possible to give a firm indication of
attendance at this stage but expressions of interest would be appreciated.
Submissions should be sent via e-mail to: dave@?????.??.??
AMSAT-UK also invite anyone with requests for Program Topics to submit
them as
soon as possible to G4DPZ. Invitations for any papers on specific
subjects will
be included in the future call. Likewise if anyone knows of a good speaker,
please send contact and other information to G4DPZ.
[ANS thanks Dave, G4DPZ, for the above information]
---------------------------------------------------------------------
Upcoming ARISS Contact and Event Schedule
Valday, Russia, direct via TBD
The ISS callsign is presently scheduled to be RS?ISS
The scheduled astronaut is Oleg Artemyev
Contact is a go for 2018-04-04 TBD UTC
Vologda, Russia, direct via TBD
The ISS callsign is presently scheduled to be RS?ISS
The scheduled astronaut is Oleg Artemyev
Contact is a go for 2018-04-10 13:37 UTC
Watch for SSTV
2018-04-02 15:05 UTC to 18:30 UTC
2018-04-03 14:15 UTC to 18:40 UTC
2018-04-12 to 2018-04-14
Additional information can be found at http://ariss-sstv.blogspot.com/
[ANS thanks Charlie, AJ9N, for the above information]
---------------------------------------------------------------------
Athenoxat-1 QSL Card Challenge
The Athenoxat-1 project team has implemented an interesting experiment
(puzzle)
where frames containing fragments of images of QSL cards are periodically
transmitted by the satellite. Amateurs can participate in the experiment by
receiving the fragments and sending KISS files via email to the
Athenoxsat-1
project team. The frames will then be processed and the results will
posted in
their web site with acknowledgements to the participating stations.
AMSAT-BR would like to encourage amateurs to participate. Due to the
satellite
orbit inclination (15 degrees), only locations with latitudes below the
tropics
will be able to receive signals from the satellite on 437.485 MHz.
Signals can
be demodulated using UZ7HO?s high speed soundmodem software (using the
GOMX-1
4800 bps demodulator).
The project website is: http://www.micro-space.org/ham.html
[ANS thanks AMSAT-UK and Yesie, 9V1SQ, for the above information]
---------------------------------------------------------------------
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,
Lee McLamb, KT4TZ
kt4tz at amsat dot org
------------------------------
Message: 9
Date: Sun, 1 Apr 2018 04:52:59 +0000 (UTC)
From: Kevin M <n4ufo@?????.???>
To: "Kevin M. via AMSAT-BB" <amsat-bb@?????.???>
Subject: Re: [amsat-bb] CTCSS Sat Tone Operation
Message-ID: <1159473347.322569.1522558379840@????.?????.???>
Content-Type: text/plain; charset=UTF-8
> I suddenly realized that there was no CTCSS technology in this radio, but
I could never tell while on air, on SO-50, AO-91, or AO-92, today!
Hi Cee,
I'm afraid despite your observation, it DOES matter on SO-50... it will not
retransmit your signal without the tone. (unless it's while you are
overriding someone else's signal) Please DO NOT transmit to SO-50 without a
CTCSS tone of 67.0 Hz as you can and likely will CAUSE QRM. There are a
number of terrestrial stations now (cross band repeaters, remote bases,
etc.) that transmit on the SO-50 2m uplink without a tone and cause
considerable QRM problems. Their strong signals 'collide' with stations
trying to talk through SO-50 and it results in at most a squealing crash of
signals, but more than likely nothing getting repeated at all. (Sometimes
the 'dead air' on SO-50 is because of either this or because too many ops
are trying to transmit at once... no one clearly gets through and the tone
is not heard by the receiver; SO, it doesn't key up the downlink.) Without
the tone, we cannot hear these QRMing stations when they 'transmit in the
clear' in order to catch a callsign or a locat
ion.
Just to be clear... this is the case with SO-50... AO-85, AO-91 and AO-92
are different.
Thanks & 73, Kevin N4UFO
------------------------------
Message: 10
Date: Sun, 1 Apr 2018 04:58:39 +0000 (UTC)
From: Kevin M <n4ufo@?????.???>
To: "Kevin M. via AMSAT-BB" <amsat-bb@?????.???>
Subject: Re: [amsat-bb] CTCSS Sat Tone Operation
Message-ID: <1700420524.304181.1522558719483@????.?????.???>
Content-Type: text/plain; charset=UTF-8
> I have recently resurrected, for Easter, an ancient Kenwood TS-9500, a 435
MHz Sat radio.
DOH! DOH! Okay... you would have been RECEIVING SO-50 with that radio, so
not a problem... CTCSS won't matter a bit. BUT, what I said holds true for
CTCSS tones on a 2m transmit radio for SO-50.? It's late, my apologies.? 73,
Kevin N4UFO
?------------------------------------------------------------------
> I suddenly realized that there was no CTCSS technology in this radio, but
I could never tell while on air, on SO-50, AO-91, or AO-92, today!
Hi Cee,
I'm afraid despite your observation, it DOES matter on SO-50... it will not
retransmit your signal without the tone. (unless it's while you are
overriding someone else's signal) Please DO NOT transmit to SO-50 without a
CTCSS tone of 67.0 Hz as you can and likely will CAUSE QRM. There are a
number of terrestrial stations now (cross band repeaters, remote bases,
etc.) that transmit on the SO-50 2m uplink without a tone and cause
considerable QRM problems. Their strong signals 'collide' with stations
trying to talk through SO-50 and it results in at most a squealing crash of
signals, but more than likely nothing getting repeated at all. (Sometimes
the 'dead air' on SO-50 is because of either this or because too many ops
are trying to transmit at once... no one clearly gets through and the tone
is not heard by the receiver; SO, it doesn't key up the downlink.) Without
the tone, we cannot hear these QRMing stations when they 'transmit in the
clear' in order to catch a callsign or a locat
ion.
Just to be clear... this is the case with SO-50... AO-85, AO-91 and AO-92
are different.
Thanks & 73, Kevin N4UFO
------------------------------
Message: 11
Date: Sat, 31 Mar 2018 22:37:26 -0700 (PDT)
From: Brad WF7T <brad.wf7t@?????.???>
To: AMSAT BB <amsat-bb@?????.???>
Subject: [amsat-bb] Fwd: Polluted time server causing issues with
digital modes
Message-ID: <cd468e55-ec5f-44cd-9bef-d05cd80d414b@????????????.???>
Content-Type: text/plain; charset=UTF-8
I am forwarding this for anyone interested. I think my discovery is correct
and invite additional review/scrutiny.
73 Brad WF7T
On Sunday, April 1, 2018 at 12:21:36 AM UTC-5, Brad WF7T wrote:
>
> *I have discovered a polluted time server that is wreaking havoc with
> time-synced digital modes, and worse. For everyone using round-robin style
> time synchronization like Dimension 4, please remove the following time
> server: rackety.udel.edu <http://rackety.udel.edu>.* It is consistently
> sending time sync corrections that are between 10 and 41 seconds different
> than every other SNTP server in the world. This will cause your PC clocks
> to skip this amount and stay that way until another time sync occurs, e.g.
> 5 to 15 minutes later, causing another massive time correction by another
> accurate time NTP server. Please pass this information along to all
> digital-active hams.
>
> While this amount of time is not of any consequence for RTTY, PSK and the
> like, this behavior is detrimental to WSJT and QRSS modes. Terrestrial WSJT
> modes like FT8, WSPR, Meteor scatter MSK144, and EME modes fail to decode
> and will cause out of sequence transmissions.
>
> I also noticed a number of out-of-sequence FT8 tranmissions on 40M this
> afternoon (BTW, open early to EU), which clued me into the situation. This
> messed up time server could have been a contributor.
>
> *Remove or disable the following server: rackety.udel.edu
> <http://rackety.udel.edu>.* Apparently it has been getting increasingly
> worse since 3/8/2018 or so. I only discovered this tonight while I was
> decoding WSPR on 474.2KHz (630M) and saw a huge time jump and lack of
> decodes of some fairly strong signals.
>
> And yes, this is also an InfoSec problem. Time bases are important for
> MANY Information Security purposes, but beyond the scope of this discussion.
>
> Excerpts of my Dimension4 time-base logs below. Please contact me with
> questions/comments.
>
> 73 Brad WF7T
> Nashville, TN
>
> ---
>
> ... First noted occurrence in my time-base logs
>
> 2018-03-07 10:36:44.461 -7.962988e+000 rackety.udel.edu SNTP <-- 7 second
> correction
> 2018-03-07 10:39:52.480 7.980464e+000 clock-1.cs.cmu.edu SNTP <-- fixed
> on next round-robin sync
>
> ... Persists for a second day, appearing to get worse
>
> 2018-03-08 09:17:25.217 -1.015543e+001 rackety.udel.edu SNTP <-- 10
> second correction
> 2018-03-08 09:20:35.240 9.963055e+000 clock-1.cs.cmu.edu SNTP <-- Fixed
> on next round-robin sync
>
> ... Jump ahead a week; yup, getting worse
>
> 2018-03-15 05:34:10.880 -1.761963e+001 rackety.udel.edu SNTP <-- 17
> second correction
> 2018-03-15 05:37:29.176 1.812267e+001 ntp.cais.rnp.br SNTP <--
> Fixed on next round-robin sync
>
> ... Skipping ahead to tonight; SNAFU
>
> 2018-03-31 23:29:34.849 -4.165045e+001 rackety.udel.edu SNTP <-- 41.6
> second correction!
> 2018-03-31 23:33:35.421 4.192192e+001 ntp2.kansas.net SNTP <-- fixed on
> next round-robin sync
>
>
------------------------------
Message: 12
Date: Sun, 1 Apr 2018 03:22:31 -0500
From: "Nick Pugh" <quadpugh@?????????.???>
To: "'Amsat BB'" <AMSAT-BB@?????.???>
Subject: [amsat-bb] cube sat question
Message-ID: <085701d3c992$9516e470$bf44ad50$@?????????.???>
Content-Type: text/plain; charset="us-ascii"
We are flying Trisol solar cells and have been recommended to use CV10-2500
by NUSEL for UV protection. The cost is $850 for 50grams. Question is the a
less expensive alternative or does some on the list has a small quantity
they would sell to the team
nick
Cell 337 258 2527
Helping UL become a world Class Engineering and Educational School
Disagree I Learn
------------------------------
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