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CX2SA > SATDIG 02.04.18 06:12l 872 Lines 31346 Bytes #999 (0) @ WW
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Sent: 180402/0407Z @:CX2SA.SAL.URY.SOAM #:39191 [Salto] FBB7.00e $:AMSATBB13126
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Grid DM07 Yosemite QSOs (Bob Keating)
2. Re: Tiangong Re-entry (0000 UTC +/- 2.5 hrs) (Greg D)
3. Re: Tiangong Re-entry (0000 UTC +/- 2.5 hrs) (Roger)
4. Re: Tiangong Re-entry (0000 UTC +/- 2.5 hrs) (Roger)
5. Article about cubesat space junk (John Brier)
6. Tiangong1 reentry - "live tracking" (John Mitchell)
7. Re: Grid DM07 Yosemite QSOs (Ted Krempa)
8. Re: Tiangong1 reentry - "live tracking" (Ted Krempa)
9. FW: entry time (Andy)
10. Re: Fwd: Polluted time server causing issues with digital
modes (Brad Brooks)
11. Re: Grid DM07 Yosemite QSOs (Bob Keating)
----------------------------------------------------------------------
Message: 1
Date: Sun, 1 Apr 2018 16:27:26 -0700
From: Bob Keating <bkeating1954@?????.???>
To: AMSAT-BB@?????.???
Subject: [amsat-bb] Grid DM07 Yosemite QSOs
Message-ID: <b92ab761-675a-5325-b6b8-8f3566b3cd43@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Thanks to everyone that? contacted me while we were enjoying our "mini
dxpedtion" to Yosemite. I had a total of 43 QSOs on all four FM
satellites over a span of 4 days.? I have uploaded my QSOs to LoTW and
QRZ.com and will upload to eQSL this evening. There were a couple of
call signs that I apparently did no get correct. I had them listed in my
log as KA7FBP QSOed on 3/29 and KK6DDT and K7ULF both QSOs on 3/28. If
this looks like your call, please let me know so that I can correct my
log. Thank you!
73,
Bob, N6REK
------------------------------
Message: 2
Date: Sun, 1 Apr 2018 17:03:13 -0700
From: Greg D <ko6th.greg@?????.???>
To: Robert Bruninga <bruninga@????.???>, amsat bb <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Tiangong Re-entry (0000 UTC +/- 2.5 hrs)
Message-ID: <72c75e14-35fd-2474-8df8-950712bbe7a3@?????.???>
Content-Type: text/plain; charset=us-ascii
I just updated the keps on gPredict, and Tiangong-1 disappeared from the
list. Where'd it come down, or are rumors of its demise ever so
slightly exaggerated? Heavens-above still thinks it's up there.
Greg KO6TH
Robert Bruninga wrote:
> Since this is journalism, I think you and some others are right. If one
> simply looks at latitude as a number, then the latitude near the
> inclination will have a higher probability of appearing. But the best
> feedback came from Ralph W0RPK who pointed out this page which is tracking
> the orbit with updated predictions:
> http://www.aerospace.org/CORDSuploads/TiangongStoryboard.png
>
> And the USA is about as far as you can get from the predicted impact. The
> USA is 12 hours out of cycle with the orbit.
>
> The prediction there is currently showing about 0000 UTC which is 8 PM EDT
> plus or minus 2.5 hours. (which is about 3 orbits worth). And although
> those orbits cover a vast Pacific and Atlantic oceans, a good portion of
> them cross the middle east through Russia and china.
>
> Bob, WB4APR
>
> On Sun, Apr 1, 2018 at 11:26 AM, Gary Bender, WS5N <ws5n@????????.???>
> wrote:
>
>> I was thinking the favoring of higher latitudes for reentry was because
>> the apparent sine wave of the ground track naturally slows down in
>> "latitude velocity" as it peaks at 43 degrees and reverses. Add in the
>> rotation of the earth under it and you end up with a bit more dwell time
>> above 38 degrees. It is changing latitude much faster between the
>> extremes. (Or maybe I am over thinking it.)
>> --
>> Gary, WS5N
>>
>> ----- Original Message -----
>> From: "Robert Bruninga" <bruninga@????.???>
>> To: "amsat bb" <amsat-bb@?????.???>
>> Cc: "TAPR APRS Mailing List" <aprssig@????.???>
>> Sent: Saturday, March 31, 2018 5:55:17 PM
>> Subject: Re: [aprssig] [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
>>
<https://www.theguardian.com/science/2018/mar/30/chinas-tiangong-1-space-st%0A
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
>>
> _______________________________________________
> 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: Sun, 1 Apr 2018 17:11:10 -0700
From: Roger <ai7rogerroger@?????.???>
To: Greg D <ko6th.greg@?????.???>
Cc: amsat bb <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Tiangong Re-entry (0000 UTC +/- 2.5 hrs)
Message-ID:
<CAEahN0Kp_vVRAdzpE45rP+k1ev2zaap5N6atQgM80MGLpnWmKw@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
http://www.aerospace.org/CORDSuploads/TiangongStoryboard.png
Shows it on what's expected to be it's last orbit.
73, Roger
W7TZ
CN83ia
Grid Busters
w7tz.webs.com
On Sun, Apr 1, 2018 at 5:03 PM, Greg D <ko6th.greg@?????.???> wrote:
> I just updated the keps on gPredict, and Tiangong-1 disappeared from the
> list. Where'd it come down, or are rumors of its demise ever so
> slightly exaggerated? Heavens-above still thinks it's up there.
>
> Greg KO6TH
>
>
> Robert Bruninga wrote:
> > Since this is journalism, I think you and some others are right. If one
> > simply looks at latitude as a number, then the latitude near the
> > inclination will have a higher probability of appearing. But the best
> > feedback came from Ralph W0RPK who pointed out this page which is
> tracking
> > the orbit with updated predictions:
> > http://www.aerospace.org/CORDSuploads/TiangongStoryboard.png
> >
> > And the USA is about as far as you can get from the predicted impact.
> The
> > USA is 12 hours out of cycle with the orbit.
> >
> > The prediction there is currently showing about 0000 UTC which is 8 PM
> EDT
> > plus or minus 2.5 hours. (which is about 3 orbits worth). And although
> > those orbits cover a vast Pacific and Atlantic oceans, a good portion of
> > them cross the middle east through Russia and china.
> >
> > Bob, WB4APR
> >
> > On Sun, Apr 1, 2018 at 11:26 AM, Gary Bender, WS5N <ws5n@????????.???>
> > wrote:
> >
> >> I was thinking the favoring of higher latitudes for reentry was because
> >> the apparent sine wave of the ground track naturally slows down in
> >> "latitude velocity" as it peaks at 43 degrees and reverses. Add in the
> >> rotation of the earth under it and you end up with a bit more dwell time
> >> above 38 degrees. It is changing latitude much faster between the
> >> extremes. (Or maybe I am over thinking it.)
> >> --
> >> Gary, WS5N
> >>
> >> ----- Original Message -----
> >> From: "Robert Bruninga" <bruninga@????.???>
> >> To: "amsat bb" <amsat-bb@?????.???>
> >> Cc: "TAPR APRS Mailing List" <aprssig@????.???>
> >> Sent: Saturday, March 31, 2018 5:55:17 PM
> >> Subject: Re: [aprssig] [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
> >> <https://www.theguardian.com/science/2018/mar/30/chinas-
> tiangong-1-space-st%0Aation-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
> >>
> > _______________________________________________
> > 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: 4
Date: Sun, 1 Apr 2018 17:17:04 -0700
From: Roger <ai7rogerroger@?????.???>
To: Greg D <ko6th.greg@?????.???>
Cc: amsat bb <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Tiangong Re-entry (0000 UTC +/- 2.5 hrs)
Message-ID:
<CAEahN0LbS8PkmazdF5=0T-vtyf5f86BLdLTE=NsY8nTxHxv+jg@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
You have to manually refresh, F5.
73, Roger
W7TZ
CN83ia
Grid Busters
w7tz.webs.com
On Sun, Apr 1, 2018 at 5:15 PM, Greg D <ko6th.greg@?????.???> wrote:
> Ah, interesting site. Wouldn't it be fitting if it returned to the launch
> site. Looks like it might pass just under...
>
> For a change, Australia isn't a target this time :).
>
> Greg KO6TH
>
>
>
> Roger wrote:
>
> http://www.aerospace.org/CORDSuploads/TiangongStoryboard.png
>
> Shows it on what's expected to be it's last orbit.
>
>
> 73, Roger
> W7TZ
> CN83ia
> Grid Busters
> w7tz.webs.com
>
> On Sun, Apr 1, 2018 at 5:03 PM, Greg D <ko6th.greg@?????.???> wrote:
>
>> I just updated the keps on gPredict, and Tiangong-1 disappeared from the
>> list. Where'd it come down, or are rumors of its demise ever so
>> slightly exaggerated? Heavens-above still thinks it's up there.
>>
>> Greg KO6TH
>>
>>
>> Robert Bruninga wrote:
>> > Since this is journalism, I think you and some others are right. If one
>> > simply looks at latitude as a number, then the latitude near the
>> > inclination will have a higher probability of appearing. But the best
>> > feedback came from Ralph W0RPK who pointed out this page which is
>> tracking
>> > the orbit with updated predictions:
>> > http://www.aerospace.org/CORDSuploads/TiangongStoryboard.png
>> >
>> > And the USA is about as far as you can get from the predicted impact.
>> The
>> > USA is 12 hours out of cycle with the orbit.
>> >
>> > The prediction there is currently showing about 0000 UTC which is 8 PM
>> EDT
>> > plus or minus 2.5 hours. (which is about 3 orbits worth). And although
>> > those orbits cover a vast Pacific and Atlantic oceans, a good portion of
>> > them cross the middle east through Russia and china.
>> >
>> > Bob, WB4APR
>> >
>> > On Sun, Apr 1, 2018 at 11:26 AM, Gary Bender, WS5N <ws5n@????????.???>
>> > wrote:
>> >
>> >> I was thinking the favoring of higher latitudes for reentry was because
>> >> the apparent sine wave of the ground track naturally slows down in
>> >> "latitude velocity" as it peaks at 43 degrees and reverses. Add in the
>> >> rotation of the earth under it and you end up with a bit more dwell
>> time
>> >> above 38 degrees. It is changing latitude much faster between the
>> >> extremes. (Or maybe I am over thinking it.)
>> >> --
>> >> Gary, WS5N
>> >>
>> >> ----- Original Message -----
>> >> From: "Robert Bruninga" <bruninga@????.???>
>> >> To: "amsat bb" <amsat-bb@?????.???>
>> >> Cc: "TAPR APRS Mailing List" <aprssig@????.???>
>> >> Sent: Saturday, March 31, 2018 5:55:17 PM
>> >> Subject: Re: [aprssig] [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-tiang
>> ong-1-space-st
>> >> ation-will-crash-to-earth-this-weekend
>> >> <https://www.theguardian.com/science/2018/mar/30/chinas-tian
>> gong-1-space-st%0Aation-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
>> >>
>> > _______________________________________________
>> > 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: Mon, 02 Apr 2018 00:39:48 +0000
From: John Brier <johnbrier@?????.???>
To: AMSAT BB <amsat-bb@?????.???>
Subject: [amsat-bb] Article about cubesat space junk
Message-ID:
<CALn0fKMNbvr7ZvRuXnv3qzNz5nek_qU1nBFYOJ6+cKuc5yvTaA@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Not your typical space junk article. It leads with the release of 100+ sats
by the same Indian rocket that launched AO-92.
https://www.wsj.com/articles/we-need-satellitesa-speeding-mass-of-space-junk-p
uts-them-at-risk-1505226427
------------------------------
Message: 6
Date: Sun, 1 Apr 2018 17:15:27 -0400
From: John Mitchell <john280z@?????.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] Tiangong1 reentry - "live tracking"
Message-ID:
<CAMOp_XBo9fAoQi1U8r=tD4nFUiS4R5GAyGS6=j168G8w5esu_w@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
You may find this twitter post about the 'live' on-line tracking sites
interesting:
https://twitter.com/Marco_Langbroek/status/980549243701268482
john mitchell KK4VUR
------------------------------
Message: 7
Date: Sun, 1 Apr 2018 18:08:38 -0700
From: "Ted Krempa" <k7trkradio@???????.???>
To: "'Bob Keating'" <bkeating1954@?????.???>, <AMSAT-BB@?????.???>
Subject: Re: [amsat-bb] Grid DM07 Yosemite QSOs
Message-ID: <000301d3ca1f$2227ffc0$6677ff40$@???????.???>
Content-Type: text/plain; charset="utf-8"
Thank you for the effort, Bob
73, Ted
K7TRK
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of Bob Keating
Sent: Sunday, April 1, 2018 4:27 PM
To: AMSAT-BB@?????.???
Subject: [amsat-bb] Grid DM07 Yosemite QSOs
Thanks to everyone that contacted me while we were enjoying our "mini
dxpedtion" to Yosemite. I had a total of 43 QSOs on all four FM satellites
over a span of 4 days. I have uploaded my QSOs to LoTW and QRZ.com and will
upload to eQSL this evening. There were a couple of call signs that I
apparently did no get correct. I had them listed in my log as KA7FBP QSOed
on 3/29 and KK6DDT and K7ULF both QSOs on 3/28. If this looks like your
call, please let me know so that I can correct my log. Thank you!
73,
Bob, N6REK
_______________________________________________
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: Sun, 1 Apr 2018 18:58:25 -0700
From: "Ted Krempa" <k7trkradio@???????.???>
To: "'John Mitchell'" <john280z@?????.???>, <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Tiangong1 reentry - "live tracking"
Message-ID: <000301d3ca26$16662fc0$43328f40$@???????.???>
Content-Type: text/plain; charset="us-ascii"
It has burned !
K7TRK
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of John
Mitchell
Sent: Sunday, April 1, 2018 2:15 PM
To: amsat-bb@?????.???
Subject: [amsat-bb] Tiangong1 reentry - "live tracking"
You may find this twitter post about the 'live' on-line tracking sites
interesting:
https://twitter.com/Marco_Langbroek/status/980549243701268482
john mitchell KK4VUR
_______________________________________________
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: 9
Date: Sun, 1 Apr 2018 22:13:00 -0500
From: "Andy" <w5acm@??????.???>
To: <amsat-bb@?????.???>
Subject: [amsat-bb] FW: entry time
Message-ID: <000c01d3ca30$82039470$860abd50$@??????.???>
Content-Type: text/plain; charset="UTF-8"
FYI
From: Gil Carman
Sent: Sunday, April 01, 2018 8:56 PM
To: Andy <w5acm@??????.???>
Subject: Re: entry time
StratCom has confirmed that it entered at 7:16 pm CDT, a southbound pass
into the south Pacific.
------------------------------
Message: 10
Date: Sun, 1 Apr 2018 21:25:18 -0500
From: Brad Brooks <brad.wf7t@?????.???>
To: "amsat-bb@?????.???? <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Fwd: Polluted time server causing issues with
digital modes
Message-ID:
<CAONzx51++w=Hn8OknFMdYj2dx_jcOn=m+nULh9uUur0Siy73rA@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Just a reminder regarding my message: I am not criticizing or stating that
Dimension4 or any other package that uses round-robin DNS is to fault. It
is the one NTP server--rackety.udel.edu--that was causing the problem.
Remove this from your configuration options, and avoid it all together, and
your time sync package-of-choice will run fine. 73 Brad
On Sun, Apr 1, 2018 at 1:52 PM, R.T.Liddy <k8bl@?????????.???> wrote:
> Frank,
>
> Since getting involved with FT8, I've been using
> the Meinberg Software on my computers to stay in
> sync with other stations worldwide. It has served
> me very well.
>
> Bob K8BL
>
> https://www.meinbergglobal.com/english/productinfo/time-server.htm
> ________________________________
> From: Frank <k6fw1@???????.???>
> To: amsat-bb@?????.???
> Sent: Sunday, April 1, 2018 1:41 PM
> Subject: Re: [amsat-bb] Fwd: Polluted time server causing issues with
> digital modes
>
>
>
> I looked at my log since 2009, my copy of Dimension 4 has never used
> this time sever. The notes on this time server states closed and only
> for use by networks of 10 or more computers. Matter of fact my
> Dimension 4 has only connected to the same time server since 2009. I
> don't know what controls Dimension 4 and which time server it uses, but
> it does not seem to be random. I agree that if a station is using a
> time server that is not accurate then the modes that rely on precise
> time syncing will not work.
>
> Frank
> K6FW
>
> On 3/31/18 10:37 PM, Brad WF7T wrote:
> > 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
> >>
> >>
> > _______________________________________________
> > 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
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>
>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
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> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
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------------------------------
Message: 11
Date: Sun, 1 Apr 2018 21:02:13 -0700
From: Bob Keating <bkeating1954@?????.???>
To: Ted Krempa <k7trkradio@???????.???>, AMSAT-BB@?????.???
Subject: Re: [amsat-bb] Grid DM07 Yosemite QSOs
Message-ID: <f50062f1-3d99-ba65-7282-7ff7cc4a0dc3@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi Ted,
You are very welcome. It was a lot of fun and a bit of a challenge, but
I had my brother John, AI6 LY, to share in the experience with me. I
love Yosemite in the off season, cant stand the crowds during the
summer. Hope to get back up there again and activate DM05 in the next
year or 2.
73,
Bob, N6REK
On 4/1/2018 6:08 PM, Ted Krempa wrote:
> Thank you for the effort, Bob
>
> 73, Ted
> K7TRK
>
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of Bob Keating
> Sent: Sunday, April 1, 2018 4:27 PM
> To: AMSAT-BB@?????.???
> Subject: [amsat-bb] Grid DM07 Yosemite QSOs
>
> Thanks to everyone that contacted me while we were enjoying our "mini
dxpedtion" to Yosemite. I had a total of 43 QSOs on all four FM satellites
over a span of 4 days. I have uploaded my QSOs to LoTW and QRZ.com and will
upload to eQSL this evening. There were a couple of call signs that I
apparently did no get correct. I had them listed in my log as KA7FBP QSOed
on 3/29 and KK6DDT and K7ULF both QSOs on 3/28. If this looks like your
call, please let me know so that I can correct my log. Thank you!
>
> 73,
>
> Bob, N6REK
>
> _______________________________________________
> 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
>
------------------------------
Subject: Digest Footer
_______________________________________________
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 member? Join now to support the amateur satellite program!
http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 13, Issue 126
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