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CX2SA > SATDIG 29.03.18 04:43l 1071 Lines 35474 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. AO-92 fading (Kevin M)
2. Re: AO-92 fading (Roy Dean)
3. Re: AO-92 fading (Jean Marc Momple)
4. Re: AO-92 fading (Paul Andrews)
5. Re: AO-92 fading (Andrew Glasbrenner)
6. Re: AO-92 fading (Jean Marc Momple)
7. Re: AO-92 fading (tjschuessler@???????.????
8. Upcoming ARISS Contact Schedule as of 2018-03-29 01:30 UTC
(aj9n@???.????
9. VE3HLS Easter Rove (Ken Alexander)
----------------------------------------------------------------------
Message: 1
Date: Wed, 28 Mar 2018 15:09:59 +0000 (UTC)
From: Kevin M <n4ufo@?????.???>
To: "Kevin M. via AMSAT-BB" <amsat-bb@?????.???>
Subject: [amsat-bb] AO-92 fading
Message-ID: <70998488.304156.1522249799450@????.?????.???>
Content-Type: text/plain; charset=UTF-8
Again, even in full duplex how do you distinguish between a
non-matchinguplink vs non-matching downlink? You only "hear" the downlink!
73, Stefan VE4NSA-----------------
Maybe it's just because I maintained repeaters for years and have a 'trained
ear', but for me the difference is easy to hear. The downlink is a carrier
and has it's own quality of fading that is very different than the
'repeated' audio that is ON the carrier which will have a slightly
'processed' sound. In other words... if the carrier is loud and strong, full
quieting and steady strength on RX meter, then any white noise fade
'swooshes' that would occur on an individual repeated signal (but not the
subaudible telemetry, which is easily detectable to my ear) would be on the
uplink signal. Put another way, if the fading happens to both the carrier &
telemetry as well as the voice audio, it's the downlink... if the carrier
and telemetry are constant and only the 'carried audio' fades, it's on the
uplink.
Just another comment on things discussed... I have only worked a single pass
of AO-91 with an Arrow, never AO-85 or AO-92. I have mostly worked these
birds from home where my yagis are both same polarity. During my trip I had
very good success with an Elk using 5 watts on all the birds. I've read in
the past that Elks can have an advantage since the uplink and downlink
antennas on the sats are in the same polarity. My observations would seem to
bear that out, because I had to make no 'TX/RX twists' with the Elk, even on
AO-85. Combined with the ease of carrying and accessing the Elk while fully
assembled, it may well become my primary 'roving' antenna. At least for
those 'quick stops' while traveling. That said, the Arrow doesn't get left
home, either. But it may be reserved for those 'special passes' and
'destination' grids.
73 all, Kevin N4UFO
------------------------------
Message: 2
Date: Wed, 28 Mar 2018 11:45:26 -0400
From: Roy Dean <royldean@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] AO-92 fading
Message-ID:
<CADGPg2trkr+Q2=9Nqb_h6041ZkVsVOZt7R_DngcYPmUz4naNuQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
If you have separate uplink and downlink antennas, both with independently
switched polarity, couldn't you tune the polarity on the downlink to best
reception, and then transmit while listening and simultaneously flipping
polarity on the uplink? You'd have to switch a couple of times quickly to
be sure you weren't experiencing a downlink fade. Just a thought.
-Roy
K3RLD
Again, even in full duplex how do you distinguish between a
> non-matchinguplink vs non-matching downlink? You only "hear" the downlink!
------------------------------
Message: 3
Date: Wed, 28 Mar 2018 20:06:10 +0400
From: Jean Marc Momple <jean.marc.momple@?????.???>
To: "Mark L. Hammond" <marklhammond@?????.???>
Cc: Amsat - BBs <amsat-bb@?????.???>
Subject: Re: [amsat-bb] AO-92 fading
Message-ID: <5FC34871-2FA3-4B82-9985-E18653C06426@?????.???>
Content-Type: text/plain; charset=utf-8
Dear All,
I am happy to have triggered an interesting subject and wish to try to try
to answer to some question/comments as follows:
1) First as rightly pointed out by Paul (N8HM) that the fading we notice is
not an indication of the Health of the bird and spinning is quite different
from spacecraft to spacecraft, fully agree. Also the FoxTelem is a good tool
for understanding better the spin and other characteristics of the Fox
series. I do play a lot with these and learning a lot. Thanks to the
programers who made such a good tool.
2) My observation about possible degradation, which is just a question that
AO-92 fading may be degrading is not based on any scientific fact but just
an subjective observation as I noticed that the fading ?dips? are more deep
as time pass (hopefully I am wrong). I will continue to observe same and
feedback on the BB if confirmed. It may be due to degradation of my setup
also...
2) One cannot determine if the fading is on the uplink or downlink with a
portables and an Arrow type antenna, and one receiver only. In spite
portable setup quite good setup on AO-91, AO-92, SO-50 and FO-29 for voice
which I a am also using, one need to be able to switch the polarization to
determine where is the fading, and have a second receiver connected to same
receiving antenna.
3) How to I know that the more impacting fading is on the uplink? very simple:
i) I use a SDR to receive the telemetry and monitor the SNR of FoxTelem and
the watch for the unfiltered Audio at the same time. The TLM is transmitted
by the Bird, taking into account the small delay of the SDR Audio I also
ilsten to any FM noise due to weak signal.
ii) The TS-2000 is also connected (with a power divider) on the same
receiving antenna and I monitor the downlink audio from my own transmission.
Switch polarization whenever required (both on Rx and Tx).
iii) Switching the uplink polarization is also a good indication, as if if
the fading disappear it is a good indication that it is a uplink
polarization issue.
iv) If there is a sharp degradation (noisy reception) on the voice but none
degradation noticed of the Telemetry filtered/unfilterd audio and SNR on
FoxTelem (again taking into account any possible delay with SDR) it means
that the fading is on the uplink. I experience this many times in the past
weeks and confirm that it is very pronounced on the uplink on U/V and much
more on L-mode.
v) To note that there is also fading on the downlink.
This experiment can only be done when none-one else are doing QSO?s and that
you have the Bird for yourself, it is the case for me as being in the middle
of the Indian Ocean and having the Bird for myself during all the pass,
someone told me recently that I was lucky on this front, yes I am for this
kind of experimenting, Hi! and if anyone wish to use me for experiment some
ideas which needs a quiet environment I would be please to do same.
Hope this help in the discussion.
73
Jean Marc (3B8DU)
> On Mar 28, 2018, at 3:44 PM, Mark L. Hammond <marklhammond@?????.???> wrote:
>
> Stefan,
>
> The reason I suggested using telemetry is because there is no uplink
> variable to deal with. I thought the original issue was about "fading" and
> why it happens. One can look at only the downlink, if interested. This
> would allow somebody to study downlink fading. Of course, it doesn't touch
> the uplink side of the issue...but that was rather my point.
>
> Mark N8MH
>
> On Tue, Mar 27, 2018 at 10:38 PM, Stefan Wagener <wageners@?????.???> wrote:
>
>> Thanks Steve,
>>
>> Great point and well thought out. Now, let me ask you a question: After you
>> matched the downlink signal and position of your Arrow for maximum quieting
>> and best signal, what happens when you now change the position of your
>> arrow to look for best "uplink"? unless yo can keep the downlink position
>> steady you will not be able to check for the uplink.. as science tells me
>> one thing has to be constant for the other to be assessed...
>>
>> All the best,
>>
>> Stefan, VE4NSA
>>
>>
>>
>> On Tue, Mar 27, 2018 at 9:27 PM, Stephen E. Belter <seb@??????.???> wrote:
>>
>>> Stefan,
>>>
>>> You are correct that you only hear the downlink, but...
>>>
>>> From personal experience, including operating AO-85 and AO-91 today using
>>> a standard Arrow and an IC-821 (from a campground in EM87), I'm convinced
>>> that I can hear my uplink polarity mismatch.
>>>
>>> I first adjust the polarity of my antenna (by twisting my wrist) while
>>> searching for the strongest (maximum quieting) received signal. Then
>> while
>>> pressing the PTT, I tweak the Arrow polarity while going for maximum
>>> quieting while listening to myself.
>>>
>>> The best sounding full-duplex signal is typically not at the same
>> polarity
>>> as the best received signal from someone else on the satellite, but I've
>>> been able to get full quieting full-duplex. When operating full-duplex,
>> I
>>> think I'm hearing the results of *both* the uplink and downlink polarity
>>> match.
>>>
>>> And that's how I 'differentiate between uplink "weakness" from downlink'
>>> weakness.
>>>
>>> 73, Steve N9IP
>>> --
>>> Steve Belter, seb@??????.???
>>>
>>>
>>> ?On 3/27/18, 10:06 PM, "AMSAT-BB on behalf of Stefan Wagener" <
>>> amsat-bb-bounces@?????.??? on behalf of wageners@?????.???> wrote:
>>>
>>> Hi Sterling,
>>>
>>> That would assume you have the ability to switch between linear
>> uplink
>>> polarization (vertical and horizontal) and circular polarisation for
>>> uplink
>>> (right and left) and keep you downlink polarization on the same
>>> optimized path all the time, meaning you know in advance which way
>> the
>>> downlink signal is the best to compensate for any uplink
>> discrepancies.
>>> Good luck :-)
>>>
>>> But hanks, good thought!
>>>
>>> Stefan, VE4NSA
>>>
>>> On Tue, Mar 27, 2018 at 8:47 PM, Sterling Coffey <kawfey@?????.???>
>>> wrote:
>>>
>>>> If linear polarized, if you can keep your RX/downlink antenna still
>>> and
>>>> you can at least hear the satellite, and rotating your TX/uplink
>>> antenna
>>>> results in correlated signal level changes on the RX/downlink, then
>>> you've
>>>> isolated it to the uplink polarization variable.
>>>>
>>>> On Tue, Mar 27, 2018 at 8:44 PM, Stefan Wagener <
>> wageners@?????.???>
>>>> wrote:
>>>>
>>>>> Thanks,
>>>>>
>>>>> Again, even in full duplex how do you distinguish between a
>>> non-matching
>>>>> uplink vs non-matching downlink? You only "hear" the downlink!
>>>>>
>>>>> 73, Stefan VE4NSA
>>>>>
>>>>> On Tue, Mar 27, 2018 at 8:38 PM, Sterling Coffey <
>> kawfey@?????.???>
>>>>> wrote:
>>>>>
>>>>>> You can hear your own signal if you have a full duplex (two
>> radio)
>>>>>> setup. However, it's still pretty hard to tell if you use a
>> single
>>> antenna
>>>>>> (arrow, elk, etc) since you're changing the RX polarity while
>>> you're
>>>>>> changing the TX polarity too.
>>>>>>
>>>>>> On Tue, Mar 27, 2018 at 7:22 PM, Stefan Wagener <
>>> wageners@?????.???>
>>>>>> wrote:
>>>>>>
>>>>>>> One of the questions I have is why one would think that the
>> uplink
>>>>>>> (polarization) is a problem since you only have the downlink to
>>> assess
>>>>>>> and
>>>>>>> how would you differentiate between uplink "weakness" from
>>> downlink
>>>>>>> since
>>>>>>> that is the only thing you hear. In addition, at least for
>>> uplink, you
>>>>>>> could "in principle" very quickly adjust with higher power...
>> and
>>> no, I
>>>>>>> am
>>>>>>> NOT promoting crocodile behavior (big mouth little ears)
>>>>>>>
>>>>>>> Stefan, VE4NSA
>>>>>>>
>>>>>>> On Tue, Mar 27, 2018 at 2:26 PM, Burns Fisher <burns@??????.??>
>>> wrote:
>>>>>>>
>>>>>>>> If you have seen a model or picture of the Fox satellites, you
>>> may
>>>>>>> have
>>>>>>>> noticed that some of the solar panels seem to be mounted
>>> off-center.
>>>>>>> This
>>>>>>>> is intentional so that photons that reflect off the shiny side
>>> give
>>>>>>> it a
>>>>>>>> tiny off-center push that spins the bird to distribute the
>> heat
>>> more
>>>>>>>> evenly. Thus it spins faster the more time it spends in the
>>> sun. In
>>>>>>>> addition, when it crosses the equator, it should flip over (-Z
>>> and +Z
>>>>>>>> reverse sides). This is because of the passive magnetic
>>>>>>> stabilization.
>>>>>>>> But I'm guessing that since it is spinning, that causes it to
>>> wobble.
>>>>>>>>
>>>>>>>> Why 92 seems worse I don't know--I can only assume it has
>>> something
>>>>>>> to do
>>>>>>>> with the orbit. That graph that Paul posted looks very
>>> different from
>>>>>>>> AO-85, for example.
>>>>>>>>
>>>>>>>> Some RF person can correct me, but I believe that the 70cm
>>> antenna
>>>>>>> only
>>>>>>>> uses the antenna that sticks out one side, while the 2m
>> antenna
>>>>>>> actually
>>>>>>>> uses the antennas on both sides. Could that explain why the
>>> uplink
>>>>>>> has
>>>>>>>> more fading than the downlink? I don't know. Something to
>>> think
>>>>>>> about.
>>>>>>>>
>>>>>>>> 73,
>>>>>>>>
>>>>>>>> Burns WB1FJ
>>>>>>>> Fox-1 Flight Software
>>>>>>>>
>>>>>>>> On Tue, Mar 27, 2018 at 2:12 PM, Paul Stoetzer <n8hm@????.???
>>>
>>> wrote:
>>>>>>>>
>>>>>>>>> All of the Fox-1 satellites seem to spin faster or slower
>>> depending
>>>>>>> on
>>>>>>>>> orbit illumination or other factors.
>>>>>>>>>
>>>>>>>>> For example, this is the +Z panel rotation on AO-92 since
>>> launch.
>>>>>>>>>
>>>>>>>>> https://imgur.com/a/uS8TB
>>>>>>>>>
>>>>>>>>> Someone more well-versed in these matters can comment
>> further
>>> on
>>>>>>> what
>>>>>>>>> causes this, but it is definitely not an indication of the
>>> health
>>>>>>>>> status of the satellite.
>>>>>>>>>
>>>>>>>>> 73,
>>>>>>>>>
>>>>>>>>> Paul, N8HM
>>>>>>>>>
>>>>>>>>> On Tue, Mar 27, 2018 at 1:59 PM, Jean Marc Momple
>>>>>>>>> <jean.marc.momple@?????.???> wrote:
>>>>>>>>>> Dear All,
>>>>>>>>>>
>>>>>>>>>> I have been experimenting with AO-92 as from its launch.
>>> Some
>>>>>>>>> observations:
>>>>>>>>>>
>>>>>>>>>> 1) The fading on this bird seems to be high and quite
>>>>>>> unpredictable,
>>>>>>>>> requires a lot of changes of polarization to keep the Rx
>>> signal to
>>>>>>> an
>>>>>>>>> adequate level.
>>>>>>>>>>
>>>>>>>>>> 2) Seems that the fading is both on the U/V and L-mode,
>> more
>>>>>>> seems to
>>>>>>>> me
>>>>>>>>> that the uplink is more affected.
>>>>>>>>>>
>>>>>>>>>> 3) Telemetry seems to be quite reliable with FoxTelem in
>> all
>>>>>>> modes.
>>>>>>>>>>
>>>>>>>>>> Today, it was even worse losing the bird many times during
>>> the
>>>>>>> pass, it
>>>>>>>>> seems that it is degrading quite quickly, hope that this is
>>> not the
>>>>>>> case.
>>>>>>>>>>
>>>>>>>>>> Just to share my observation.
>>>>>>>>>>
>>>>>>>>>> 73
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Jean Marc (3B8du)
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> 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/l
>>>>>>> istinfo/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/l
>>>>>>> istinfo/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
>>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> 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
>>>
>>>
>>>
>> _______________________________________________
>> 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
>>
>
>
>
> --
> Mark L. Hammond [N8MH]
> _______________________________________________
> 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: Wed, 28 Mar 2018 12:43:48 -0400
From: Paul Andrews <w2hro.fn20@?????.???>
To: Roy Dean <royldean@?????.???>
Cc: amsat-bb <amsat-bb@?????.???>
Subject: Re: [amsat-bb] AO-92 fading
Message-ID:
<CAOsf+NSJBqfgBZHHgvshT6PvmfA07JwfC7-nDZvuWXqxsMEimg@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
There are so many interesting "spin" mitigation experiments possible
with FM birds.
The FM constant level carrier makes signal strength plotting relatively easy.
1) A good tracking system and automatic doppler compensation are needed.
2) Two (2) downlink antennas. One in V-pol and one in H-pol.
3) Data collection system. Lot's of options here. Sample rate
should be at least 10 samples per second.
Questions:
- Would every pass have a different spin profile?
- Is spin a bigger problem on low elevation passes or high elevation passes?
- How deep are the nulls?
- Are V-pol and H-pol nulls synchronized? Do V-pol and H-pol nulls
occur simultaneously?
- Compare AO-92 spin to an NOAA weather satellite (which is
stabilized). NOAA Sat might be a good baseline plot.
- Perform the same test with a single Circular Polarized antenna.
What are the results compared to V-pol and H-pol?
-----------------------
This would make for a great paper to be presented at an AMSAT Conference.
73 - Paul - W2HRO
On Wed, Mar 28, 2018 at 11:45 AM, Roy Dean <royldean@?????.???> wrote:
> If you have separate uplink and downlink antennas, both with independently
> switched polarity, couldn't you tune the polarity on the downlink to best
> reception, and then transmit while listening and simultaneously flipping
> polarity on the uplink? You'd have to switch a couple of times quickly to
> be sure you weren't experiencing a downlink fade. Just a thought.
>
> -Roy
> K3RLD
>
> Again, even in full duplex how do you distinguish between a
>> non-matchinguplink vs non-matching downlink? You only "hear" the downlink!
> _______________________________________________
> 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: Wed, 28 Mar 2018 12:54:43 -0400
From: "Andrew Glasbrenner" <glasbrenner@??????????.???>
To: "'Jean Marc Momple'" <jean.marc.momple@?????.???>, "'Mark L.
Hammond'" <marklhammond@?????.???>
Cc: 'Amsat - BBs' <amsat-bb@?????.???>
Subject: Re: [amsat-bb] AO-92 fading
Message-ID: <10a101d3c6b5$785edf20$691c9d60$@??????????.???>
Content-Type: text/plain; charset="utf-8"
>2) One cannot determine if the fading is on the uplink or downlink with a
portables and an Arrow type antenna, and one >receiver only.
I find the S meter is an excellent indicator of whether a fade is on the
uplink or downlink, beyond that of just hearing whether the DUV rumble goes
away or not.
73, Drew KO4MA
------------------------------
Message: 6
Date: Wed, 28 Mar 2018 21:36:13 +0400
From: Jean Marc Momple <jean.marc.momple@?????.???>
To: Andrew Glasbrenner <glasbrenner@??????????.???>
Cc: Amsat - BBs <amsat-bb@?????.???>
Subject: Re: [amsat-bb] AO-92 fading
Message-ID: <EF99F849-19D6-42DB-81A7-652284E70A87@?????.???>
Content-Type: text/plain; charset=us-ascii
Andrew,
Agree fully, simple things like the S-Meter, our ears and other operator
skills are quite good tools to make some good observations and empirical
conclusion. Having access to more sophisticated tools for sure also helps,
but we should not underestimate the basics which helps a lot to
experimentations and which is the basic of the hobby which is doing a lot
with the minimum. It may sometimes bring wrong conclusion but the history
teach us that many great things may be achieved with modest means and bring
a lot of improvement and discoveries. The real best tools to my opinion is
passion and tenacity.
73
Jean Marc (3B8DU)
> On Mar 28, 2018, at 8:54 PM, Andrew Glasbrenner
<glasbrenner@??????????.???> wrote:
>
>
>
>> 2) One cannot determine if the fading is on the uplink or downlink with a
portables and an Arrow type antenna, and one >receiver only.
>
> I find the S meter is an excellent indicator of whether a fade is on the
uplink or downlink, beyond that of just hearing whether the DUV rumble goes
away or not.
>
> 73, Drew KO4MA
>
>
------------------------------
Message: 7
Date: Wed, 28 Mar 2018 13:32:29 -0500
From: <tjschuessler@???????.???>
To: <amsat-bb@?????.???>
Subject: Re: [amsat-bb] AO-92 fading
Message-ID: <013b01d3c6c3$234d0990$69e71cb0$@???????.???>
Content-Type: text/plain; charset="us-ascii"
Remind me as to whether the satellite's TX and RX antennas are in the same
plane or 90 degrees offset? I thought the 90 degree offset was the case but
maybe I am wrong A 50/50 guess here. In a 90 degree offset mode, you would
always have a different antenna to antenna orientation as related to the
ground station antenna orientation, if polarity on the ground antennas was
the same. And since the Arrow is by design using perpendicular polarization
between the two bands, you might be either in proper polarity or not,
depending on satellite orientation at the instant of observation.
As was pointed out by someone else, the satellite is not spinning in a
constant direction but flips and spins differently by illumination, so the
fun challenge to operations. Makes it fun.
Tom Schuessler, N5HYP
EM12ms
Message: 1
Date: Tue, 27 Mar 2018 21:38:51 -0500
From: Stefan Wagener <mailto:wageners@?????.???>
To: "Stephen E. Belter" <mailto:seb@??????.???>
Cc: Burns Fisher <mailto:burns@??????.??>, amsat-bb
<mailto:amsat-bb@?????.???>,
Paul Stoetzer <mailto:n8hm@????.???>
Subject: Re: [amsat-bb] AO-92 fading
Message-ID:
<mailto:CAKu8kHDabVSxHSBAj4_C0HJqNDP6cJ=a2rzwpeg9yeipf=XTTA@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Thanks Steve,
Great point and well thought out. Now, let me ask you a question: After you
matched the downlink signal and position of your Arrow for maximum quieting
and best signal, what happens when you now change the position of your arrow
to look for best "uplink"? unless yo can keep the downlink position steady
you will not be able to check for the uplink.. as science tells me one thing
has to be constant for the other to be assessed...
All the best,
Stefan, VE4NSA
------------------------------
Message: 8
Date: Wed, 28 Mar 2018 21:20:12 -0400
From: aj9n@???.???
To: amsat-bb@?????.???
Subject: [amsat-bb] Upcoming ARISS Contact Schedule as of 2018-03-29
01:30 UTC
Message-ID: <1626f574096-1da7-bba2@?????????????.???.???????.???>
Content-Type: text/plain; charset=utf-8
Upcoming ARISS Contact Schedule as of 2018-03-29 01:30 UTC
Quick list of scheduled contacts and events:
?
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/
******************************************************************************
International Space Station Astronauts are Calling CQ Students (corrected)
?????????????? ARISS-US program education proposal deadline is April 30, 2018
?
March 15, 2018:? The Amateur Radio on the International Space Station
(ARISS) program is seeking proposals from US schools, museums, science
centers and community youth organizations (working individually or together)
to host radio contacts with an orbiting crew member aboard the International
Space Station (ISS) between January 1 and June 30, 2019.
?
Each year, ARISS provides tens of thousands of students with opportunities
to learn about space technologies and communications through the exploration
of Amateur Radio.? The program provides learning opportunities by connecting
students to astronauts aboard the International Space Station (ISS) through
a partnership between NASA, the Radio Amateur Satellite Corporation, the
American Radio Relay League, and other Amateur Radio organizations and
worldwide space agencies. The program?s goal is to inspire students to
pursue interests and careers in science, technology, engineering and
mathematics (STEM) and Amateur Radio. A ham recently said, ?ARISS shows how
Amateur Radio is the most unique hobby/service there is.?
?
Educators overwhelmingly report that student participation in the ARISS
program stimulates interest in STEM subjects and in STEM careers. One
educator wrote, ?It exceeded our expectations--it created a great interest
in both amateur radio and in space exploration. Our kids are completely
inspired!? Ninety-two percent of educators who have participated in the
program have indicated that ARISS provided ideas for encouraging student
exploration and participation. An educator even joined the ham ranks,
saying, ?This chance for our school?s ARISS contact helped me see the great
value of the ham world.? I just passed my Technician License this weekend
and have already signed up to take a General class.?? ?
ARISS is looking for organizations that will draw large numbers of
participants and integrate the contact into a well-developed, exciting
education plan. Students can learn about satellite communications, wireless
technology, science research conducted on the ISS, radio science, and any
related STEM subject. Students learn to use Amateur Radio to talk directly
to an astronaut and ask their STEM-related questions. ARISS will help
educational organizations locate Amateur Radio groups who can assist with
equipment for this once-in-a-lifetime opportunity for students.
The proposal deadline for 2019 contacts is April 30, 2018. Proposal webinars
for guidance and getting questions answers will be offered March 29, 2018,
at 7 p.m. EDT and April 16, 2018, at 4 p.m. EDT. Advance registration is
necessary. To sign up, go to
https://ariss-proposal-webinar-spring-2018.eventbrite.com
For more details such as expectations, proposal guidelines and the proposal
form, visit: http://www.ariss.org/hosting-an-ariss-contact-in-the-us.html
?
******************************************************************************
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@?????.??? or aj9n@???.???.
?
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@?????????.???
****************************************************************************
ARISS congratulations the following mentors who have now mentored over 100
schools:?
Francesco IK?WGF with 132
Satoshi 7M3TJZ with 128
Gaston ON4WF with 123
Sergey RV3DR with 102
****************************************************************************
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?2018-03-29 01:30 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 1217.
Each school counts as 1?event.
Total number of ARISS ISS to earth school contacts is 1166.
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 2018-03-28 08:00 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. 54 on orbit
Scott Tingle KG5NZA
Norishige Kanai
Alexander Skvortsov
?
Exp. 55 on orbit
Welcome aboard!
Drew Feustel
Oleg Artemyev
Ricky Arnold KE5DAU
****************************************************************************
73,
Charlie?Sufana AJ9N
One of the ARISS operation team mentors
?
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?
------------------------------
Message: 9
Date: Thu, 29 Mar 2018 02:36:03 +0000 (UTC)
From: Ken Alexander <k.alexander@??????.???>
To: AMSAT BB <amsat-bb@?????.???>
Subject: [amsat-bb] VE3HLS Easter Rove
Message-ID: <1156750487.578162.1522290963084@????.?????.???>
Content-Type: text/plain; charset=UTF-8
I'll be roving to FN09/FO00 this weekend!? Driving up on Friday, operating
on Saturday and then driving home on Sunday.
There are plenty of good passes, covering all parts of North America, into
Europe and the northern half of South America.? Please have a look at the
schedule below and get back to me if I haven't covered your QTH.? We'll try
and work something out!
As always, the schedule depends on the weather and local road conditions,
but the forecasts do look promising.? Follow me on Twitter @?????? for
updates!
?VE3HLS Easter Rove?Saturday March 31? ++ FN09/FO00 ++
?31.03.2018? FO-29? 14:14 CA?31.03.2018? AO-73? 14:26 CA?31.03.2018? AO-07?
14:36 EU?31.03.2018? AO-91? 15:20 EU?31.03.2018? AO-07? 16:24
EU+?31.03.2018? AO-91? 16:53??31.03.2018? SO-50? 17:58??31.03.2018? AO-91?
18:29??31.03.2018? SO-50? 19:40 CA/EU?31.03.2018? AO-07? 20:04 SA
?Times are my AOS (UTC)??CA - pass covers west to California?EU - pass
covers east to Europe??EU+ - pass covers deep into Europe!?SA - pass covers
well into South America
73, and Happy Easter!
KenVE3HLS
------------------------------
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End of AMSAT-BB Digest, Vol 13, Issue 120
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