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CX2SA > SATDIG 01.04.18 22:44l 840 Lines 30515 Bytes #999 (0) @ WW
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Sent: 180401/2038Z @:CX2SA.SAL.URY.SOAM #:39162 [Salto] FBB7.00e $:AMSATBB13125
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: Tiangong Re-entry on Heavens bove (Ray Hoad)
2. Required- Tone module (Nitin Muttin)
3. Funcube 1 (AO-73) vs NAYIF-1 (EO-88) Beacon Power ?
(Iain Young, G7III)
4. Re: FoxTelem Java question (Peter Green)
5. Lindenblad or DCA??? (Hans (BX2ABT))
6. Tiangong Re-entry (0000 UTC +/- 2.5 hrs) (Robert Bruninga)
7. Re: Funcube 1 (AO-73) vs NAYIF-1 (EO-88) Beacon Power ?
(Graham Shirville)
8. Re: Fwd: Polluted time server causing issues with digital
modes (Frank)
9. Re: Fwd: Polluted time server causing issues with digital
modes (R.T.Liddy)
10. L band (Bob- W7LRD)
11. Re: Lindenblad or DCA??? (Joe Spier)
12. VUCC Awards-Endorsements for March 2018 (Ronald G. Parsons)
13. Re: L band (Paul Andrews)
----------------------------------------------------------------------
Message: 1
Date: Sat, 31 Mar 2018 20:44:10 -0500
From: "Ray Hoad" <ray.hoad@????????.???>
To: <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Tiangong Re-entry on Heavens bove
Message-ID: <001e01d3c95a$eed6a3c0$cc83eb40$@????????.???>
Content-Type: text/plain; charset="us-ascii"
Tiangong 1 is NORAD CAT ID 37820 (INTLDES 2001-053A.
But note that with the drag that Tiangong 1 is experiencing TLEs will
probably not be useful.
But you can see the live ground track of Tiangong 1 at Heavens-Above.
http://www.heavens-above.com/
Ray Hoad
WA5QGD
AMSAT-NA Orbital Elements Manager
> 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: 2
Date: Sun, 1 Apr 2018 08:43:26 +0000 (UTC)
From: Nitin Muttin <vu3tyg@?????.??.??>
To: AMSAT BB <amsat-bb@?????.???>
Subject: [amsat-bb] Required- Tone module
Message-ID: <2093653128.334518.1522572206446@????.?????.???>
Content-Type: text/plain; charset=UTF-8
Friends,
I am in need of a ICOM UT-84 Tone module. If anyone willing to sell please
contact me direct.
73
Nitin [VU3TYG]
------------------------------
Message: 3
Date: Sun, 1 Apr 2018 12:56:56 +0100
From: "Iain Young, G7III" <g7iii@?????.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] Funcube 1 (AO-73) vs NAYIF-1 (EO-88) Beacon Power
?
Message-ID: <9860d103-b288-cf1c-b6d2-01875ebefddc@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi All,
I have been trying to find out what the Beacon Power Output of NAYIF-1
is, but have come up blank with my google searches. Is it just part of
the 500mW transponder ? Or is there a separate dedicated amount as in
AO-73 [Which is 300mW beacon mode, 30mW transponder mode] ?
Essentially, I can decode NAYIF-1 Telemetry. I can also decode AO-73
telemetry when the beacon is in high power (300mW), but not when AO-73
is in Transponder mode, where the beacon is only 30mw (-10dB).
Depending on the power output of NAYIF-1, I may be able to determine
if I really need a 10dB improvement in order to receive AO-73 telemetry
while in transponder mode, or if I am in fact, only need 3 or 6db
improvement, which could change my strategy
(This is a very small station in an urban environment running off a
Raspberry Pi 3, with non steerable antennas, and I'm seeing it as
an engineering experiment)
73s
Iain
PS, *grumble* They are too close together frequency wise. Due to
AO-73's frequency issues when coming out of eclipse, I need a wider
(software) BPF. This means NAYIF-1 manages to not only hit it's own
decoder, but AO-73s as well! Great Fun checking if both were visible
at the same time here, and then going, "Has to be NAYIF-1!"
------------------------------
Message: 4
Date: Sun, 01 Apr 2018 12:09:37 +0100
From: Peter Green <peteragreen@??.???>
To: AMSAT-BB@?????.???
Subject: Re: [amsat-bb] FoxTelem Java question
Message-ID: <F361BC16-010E-41B9-885F-796DE6E7FFD2@??.???>
Content-Type: text/plain; charset=utf-8
Many thanks for your help Chris.
> On 1 Apr 2018, at 02:52, Chris Thompson <chrisethompson@?????.???> wrote:
>
> 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@??.???
<mailto: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
------------------------------
Message: 5
Date: Sun, 1 Apr 2018 21:28:28 +0800
From: "Hans (BX2ABT)" <hans.bx2abt@???.?????.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] Lindenblad or DCA???
Message-ID: <baf6f7ef-384c-5a67-f8e7-cb64553e406e@???.?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Hello all,
Been reading up on satellite antennas and something is not clear to me:
are the Lindenblad and Double Cross Antenna (DCA) one and the same
beast, or not? They look the same and the only difference I can find is
that the Lindenblad seems to be slanted 30 degrees towards the horizon
and the DCA 60 degrees.
Any old timer here who can enlighten me on this?
73 from a sat newbie.
Hans
BX2ABT
------------------------------
Message: 6
Date: Sun, 1 Apr 2018 12:08:35 -0400
From: Robert Bruninga <bruninga@????.???>
To: amsat bb <amsat-bb@?????.???>
Subject: [amsat-bb] Tiangong Re-entry (0000 UTC +/- 2.5 hrs)
Message-ID:
<CALdCfNKKZD9oJOvGNKL0Ou+By1vm8HBhxroVpwmyHTvNOGUffA@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
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
>
------------------------------
Message: 7
Date: Sun, 1 Apr 2018 16:08:31 +0000 (UTC)
From: Graham Shirville <g.shirville@??????????.???>
To: "Iain Young, G7III" <g7iii@?????.???>, "amsat-bb@?????.????
<amsat-bb@?????.???>
Subject: Re: [amsat-bb] Funcube 1 (AO-73) vs NAYIF-1 (EO-88) Beacon
Power ?
Message-ID: <1638888222.245217.1522598911158@????.?????.???>
Content-Type: text/plain; charset=UTF-8
Hi Iain,
Both AO73/FUNcube-1 and EO88/Nayif-1 have the same nominal power levels for
the beacons as you state of 30mW when in amateur mode and 300mW when in
educational mode.?
The in-orbit power levels, which are actually above the nominal quoted
figure, can be read from the PA forward power telemetry in the Dashboard and
in the Warehouse and the calibration of these channels is pretty accurate.?
Of course, in amateur mode the output power level includes the transponder
but if this not being used then this is probably only 5 mW or so.?
The EO88 downlink is probably 1.5dB stronger in both modes. You can also
look at the downlink of UKube-1 which is always in amateur mode.
With a turnstile omni antenna I would expect to get perhaps 15/20 frames of
telemetry on a good, near overhead,? pass from AO73 in amateur mode and at
least 60-70 frames when in educational mode but as you mention the local
noise level will affect these numbers greatly.
Finally, if you are using the FUNcube dashboard on the Raspberry we would
love to have some details of your implementation for publication the
AMSAT-UK Oscar News magazine!
73GrahamG3VZV
PS re your "grumble" - yes this was a lesson learnt for the design team!
From: "Iain Young, G7III" <g7iii@?????.???>
To: amsat-bb@?????.???
Sent: Sunday, 1 April 2018, 13:05
Subject: [amsat-bb] Funcube 1 (AO-73) vs NAYIF-1 (EO-88) Beacon Power ?
Hi All,
I have been trying to find out what the Beacon Power Output of NAYIF-1
is, but have come up blank with my google searches. Is it just part of
the 500mW transponder ? Or is there a separate dedicated amount as in
AO-73 [Which is 300mW beacon mode, 30mW transponder mode] ?
Essentially, I can decode NAYIF-1 Telemetry. I can also decode AO-73
telemetry when the beacon is in high power (300mW), but not when AO-73
is in Transponder mode, where the beacon is only 30mw (-10dB).
Depending on the power output of NAYIF-1, I may be able to determine
if I really need a 10dB improvement in order to receive AO-73 telemetry
while in transponder mode, or if I am in fact, only need 3 or 6db
improvement, which could change my strategy
(This is a very small station in an urban environment running off a
Raspberry Pi 3, with non steerable antennas, and I'm seeing it as
an engineering experiment)
73s
Iain
PS, *grumble* They are too close together frequency wise. Due to
AO-73's frequency issues when coming out of eclipse, I need a wider
(software) BPF. This means NAYIF-1 manages to not only hit it's own
decoder, but AO-73s as well! Great Fun checking if both were visible
at the same time here, and then going, "Has to be NAYIF-1!"
_______________________________________________
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 10:41:12 -0700
From: Frank <k6fw1@???????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Fwd: Polluted time server causing issues with
digital modes
Message-ID: <59191ebd-bf5b-6efd-20f8-1364c0ed60fa@???????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
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 program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 9
Date: Sun, 1 Apr 2018 18:52:47 +0000 (UTC)
From: "R.T.Liddy" <k8bl@?????????.???>
To: Frank <k6fw1@???????.???>, "amsat-bb@?????.????
<amsat-bb@?????.???>
Subject: Re: [amsat-bb] Fwd: Polluted time server causing issues with
digital modes
Message-ID: <1274703969.382807.1522608767151@????.?????.???>
Content-Type: text/plain; charset=UTF-8
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 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: 10
Date: Sun, 1 Apr 2018 12:26:19 -0700 (PDT)
From: Bob- W7LRD <w7lrd@???????.???>
To: amsat-bb <amsat-bb@?????.???>
Subject: [amsat-bb] L band
Message-ID: <267494084.418989.1522610779712@???????.???????.???>
Content-Type: text/plain; charset=UTF-8
Hello everyone
-I finally got my 1.2ghz working! Running a IC-910/ 10W, to a 24 element
looper through 70 feet of LMR600. Thanks for the QSO with K7ULS and N7AGF,
several more heard. Unfortunately I had to run everything manually, az/el,
doppler etc. I forget but what does that gleitkommadivision durch null
mean. I know it's divide by zero, but not sure why my satpc32 does not like
it with AO-92 running. I have a 16 turn RHCP helix I want to try. Could
use more than 24 hours per week. Next we need a linear satellite with L band.
73 Bob W7LRD
------------------------------
Message: 11
Date: Sun, 1 Apr 2018 12:45:14 -0700
From: Joe Spier <wao@???.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Lindenblad or DCA???
Message-ID: <39c31af4-1bd8-6903-7723-896e28156b72@???.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Hans,
Here are links with antenna patterns for the DCA:
https://drive.google.com/file/d/0B0Dkk87YYl-xX2gzLXk5MHZKVU0/view
and the EZ-Lindenblad:
http://www.amsat.org/wordpress/wp-content/uploads/2015/08/An-EZ-Lindenblad-Ant
enna-for-2-Meters2.pdf
The difference is in the lengths of the "RG-59 (75ohm) phasing harness"
and dipoles to achieve a 50 ohm impedance at the required frequency.
The angle of the crossbooms affects the directivity of the antenna, in
the examples given, 60 degrees for a NOAA satellite in a geosynchronous
orbit and 30 degrees for a LEO orbit.
The only differences I see are the 50 ohm load feedpoint and the
Lindenblad dipoles are not exactly in the same plane as the DCA.
-73, Joe Spier, K6WAO
President, AMSAT
On 04/01/2018 06:28 AM, Hans (BX2ABT) wrote:
> Double Cross Antenna (DCA)
------------------------------
Message: 12
Date: Sun, 1 Apr 2018 15:16:31 -0500
From: "Ronald G. Parsons" <w5rkn@?????.???>
To: "AMSAT-BB" <AMSAT-BB@?????.???>
Subject: [amsat-bb] VUCC Awards-Endorsements for March 2018
Message-ID: <5222E3FD326443F1A764F723F449DF7D@?????????>
Content-Type: text/plain; charset="iso-8859-1"
Here are the endorsements and new VUCC Satellite
Awards issued by the ARRL for the period March 1, 2018
through March 31, 2018.
Congratulations to all those who made the list this month!
There were several calls which decreased by one this month.
These are not listed below.
CALL 1Mar18 1Apr18
KK5DO 780 781
WA5KBH 659 728
N4UFO 715 724
N9IP 574 589
W5RKN 554 575
N9EAT 410 428
WD9EWK 400 425
KE4AL 252 317
K7TAB 274 306
W7QL 275 300
AA8CH 104 175
PT2AP 102 172
PS8ET 127 157
N3GS 101 130
N7AGF 101 126
G0ABI 116 122
AL6D 112 (NEW VUCC)
W1AT 102 (NEW VUCC)
If you find errors or omissions. please contact me off-list
at <mycall>@<??????>.com
and I'll revise the announcement.
This list was developed by comparing the ARRL .pdf
listings for March 1, 2018. and April 1, 2018. It's a visual
comparison so omissions are possible. Apologies if your
call was not mentioned. Thanks to all those who are
roving to grids that are rarely on the birds. They are
doing most of the work!
73,
Ron W5RKN
------------------------------
Message: 13
Date: Sun, 01 Apr 2018 20:34:37 +0000
From: Paul Andrews <w2hro.fn20@?????.???>
To: Bob- W7LRD <w7lrd@???????.???>
Cc: amsat-bb <amsat-bb@?????.???>
Subject: Re: [amsat-bb] L band
Message-ID:
<CAOsf+NQY-=g0m9paD7vO_JdaLYHKtLgyfAT6UXdT=2MSfrtZSg@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
You guys are having way too much fun with the Sat L-band mode.
At 1296 MHz with 20w and a moderate sized yagi - you can work JT65 EME
(moon bounce) with on of a super stations like HB9Q. If you can generate
1296 MHz SSB. Keep weak signal EME in mind.
73 - Paul - W2HRO
On Sun, Apr 1, 2018, 15:27 Bob- W7LRD <w7lrd@???????.???> wrote:
> Hello everyone
>
> -I finally got my 1.2ghz working! Running a IC-910/ 10W, to a 24 element
> looper through 70 feet of LMR600. Thanks for the QSO with K7ULS and N7AGF,
> several more heard. Unfortunately I had to run everything manually, az/el,
> doppler etc. I forget but what does that gleitkommadivision durch null
> mean. I know it's divide by zero, but not sure why my satpc32 does not
> like it with AO-92 running. I have a 16 turn RHCP helix I want to try.
> Could use more than 24 hours per week. Next we need a linear satellite
> with L band.
>
> 73 Bob W7LRD
> _______________________________________________
> 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 125
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