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CX2SA > SATDIG 14.07.18 05:18l 956 Lines 33728 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: AO-92 1626UTC 7/12 PASS CAMERA TEST (John)
2. AirSpy & LNA questions (Hans BX2ABT)
3. Re: AirSpy & LNA questions (Ryan Butler)
4. AO-92 Camera Passes this week -- A big fat THANK YOU!!
(Zach Leffke)
5. Re: AO-92 1626UTC 7/12 PASS CAMERA TEST (Zach Leffke)
6. CM79 (Anthony Wiese)
7. Re: CM79 (Bryan KL7CN)
8. New Mexico Museum of SPACE HISTORY (Clayton Coleman W5PFG)
9. Re: AO73/FUNcube-1 Operations (Jim Heck)
10. Re: AO-92 Camera Passes this week -- A big fat THANK YOU!!
(John Brier)
11. Upcoming ARISS Contact Schedule as of 2018-07-13 21:00 UTC
(aj9n@???.????
12. Re: AirSpy & LNA questions (Hans BX2ABT)
----------------------------------------------------------------------
Message: 1
Date: Fri, 13 Jul 2018 09:29:56 +0100
From: "John" <john@?????.???.??>
To: "'Hal Dale'" <wb4aeg@????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] AO-92 1626UTC 7/12 PASS CAMERA TEST
Message-ID: <01a001d41a83$aec808d0$0c581a70$@?????.???.??>
Content-Type: text/plain; charset="UTF-8"
Hi Hal,
I too have an FT-847, however instead of programming satellites into the
memories, I let SatPC32 'get it right' for me, along with tuning for doppler
and handling tones etc. It's a far easier solution.
Otherwise, you could go through the AMSAT OSCAR Status page, and grab all
the birds you're likely to want to work from that list.
73,
John (XLX)
-----Original Message-----
From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Hal Dale
Sent: 12 July 2018 19:09
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] AO-92 1626UTC 7/12 PASS CAMERA TEST
I have a FT847. Anyone have a suggested list of Sats to input in the
memory?? Hal/WB4AEG _______________________________________________
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: Fri, 13 Jul 2018 22:29:20 +0800
From: Hans BX2ABT <hans.bx2abt@???.?????.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] AirSpy & LNA questions
Message-ID: <4138e0da-67b9-2e33-e609-debac5c713d0@???.?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Man, this sat stuff is difficult and I was getting a bit frustrated with
lack of progress, to be honest. But just when I thought I didn't get
anywhere, I went a big leap forward. But I'm not there yet, so I need
your input.
My goal is to get some decent reception of the major telemetry sats,
e.g. Funcube-1. I have two rigs: an ICOM IC820H and an AirSpy Mini SDR
running on a Linux box with GQRX as front-end. I have a Chinese Arrow
Alaska clone pointing 200 degrees with 20 degree elevation. The other
antenna currently is a turnstile tuned for 137 MHz, but I have 2/70 DCAs
as well (they had to come down this week because of a typhoon. Will be
up again shortly).
The bare antennas do fine on terrestrial signals, but up till now very
few sats were heard (mostly the Xiwang sats and Athenoxat-1) and signals
were very very weak. I got myself some proto boards and PGA103+ MMICs
and built two LNAs according to schematics found on the web. On the
workbench they perform as they should and give some 15-25 dB gain
depending on what frequency is used. I use an old AM/FM signal generator
and an RTL-SDR as crude scope since I don't have a real one.
I mounted the LNAs as close as possible to the antennas and they are fed
with a bias-T from Minikits.com.au. The first results were
disappointing: I used the AirSpy and noticed a lot more signal but also
an increased noise floor. With the AirSpy there is a lot of fiddling
going on in the software and I managed to get some improvement by
tweaking the LNA gain, Mix gain and IF gain. Still I couldn't hear any
sat signals.
This afternoon I switched from the AirSpy to the IC820H and
lo-and-behold very strong beacon signals from XW2A and F; the strongest
I've ever heard. Even the AirSpy did detect a signal, although
not-at-all as great as the IC820H. To get a cleaner signal from the
IC820H I did have to engage the attenuator on the set, though. Using the
IC820H I also heard a very weak beacon signal from CO-65, but the AirSpy
failed there. Conclusion: the IC820H could detect signals that the
AirSpy could not detect at all or detect them much better.
Pretty happy with this step forward, but not satisfied. Question is how
to improve even more.
Q1: is the LNA desensing the AirSpy (and to a lesses extend, the IC820H)
and if so, how to fix that? I read something about an attenuation
network after the LNA to improve the front-end of the receiver. Might
that help?
Q2: when not powered, MMICs seem to have a very high insertion loss. Is
there a way to remotely bypass the LNA in order to compare reception
with and without the LNA?
Q3: would filtering help? E.g. bandpass filters for 2m and 70cm. I do
realize that this would mean another couple of dB of insertion loss, but
maybe that disadvantage outweighs the advantages.
I would appreciate any input on the above and also would like to hear
from others who use the AirSpy Mini for sat reception. I already did a
lot of googling, but can't find any clear cut answers. Hope you all can
help me go into the right direction. Cheers,
Hans
BX2ABT
------------------------------
Message: 3
Date: Fri, 13 Jul 2018 09:41:09 -0500
From: Ryan Butler <rbutler@????.???>
To: hans.bx2abt@???.?????.???
Cc: amsat-bb <amsat-bb@?????.???>
Subject: Re: [amsat-bb] AirSpy & LNA questions
Message-ID:
<CAGkenmeRSBDn-zsbwYj1H1RrDdd3J9AFtpjVs4kLwjCNTGdQnw@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Yes you are on the right track, check out the following two links (similar
designs) but also provides a description of why bandpass filtering is a
must with an SDR.
https://www.rtl-sdr.com/designing-low-noise-uhf-front-end-sharp-filtering-sdr/
https://sivantoledotech.wordpress.com/2015/01/27/a-selective-and-robust-uhf-fr
ont-end/
Ryan, NF0T
On Fri, Jul 13, 2018 at 9:30 AM Hans BX2ABT <hans.bx2abt@???.?????.???>
wrote:
> Man, this sat stuff is difficult and I was getting a bit frustrated with
> lack of progress, to be honest. But just when I thought I didn't get
> anywhere, I went a big leap forward. But I'm not there yet, so I need
> your input.
>
> My goal is to get some decent reception of the major telemetry sats,
> e.g. Funcube-1. I have two rigs: an ICOM IC820H and an AirSpy Mini SDR
> running on a Linux box with GQRX as front-end. I have a Chinese Arrow
> Alaska clone pointing 200 degrees with 20 degree elevation. The other
> antenna currently is a turnstile tuned for 137 MHz, but I have 2/70 DCAs
> as well (they had to come down this week because of a typhoon. Will be
> up again shortly).
>
> The bare antennas do fine on terrestrial signals, but up till now very
> few sats were heard (mostly the Xiwang sats and Athenoxat-1) and signals
> were very very weak. I got myself some proto boards and PGA103+ MMICs
> and built two LNAs according to schematics found on the web. On the
> workbench they perform as they should and give some 15-25 dB gain
> depending on what frequency is used. I use an old AM/FM signal generator
> and an RTL-SDR as crude scope since I don't have a real one.
>
> I mounted the LNAs as close as possible to the antennas and they are fed
> with a bias-T from Minikits.com.au. The first results were
> disappointing: I used the AirSpy and noticed a lot more signal but also
> an increased noise floor. With the AirSpy there is a lot of fiddling
> going on in the software and I managed to get some improvement by
> tweaking the LNA gain, Mix gain and IF gain. Still I couldn't hear any
> sat signals.
>
> This afternoon I switched from the AirSpy to the IC820H and
> lo-and-behold very strong beacon signals from XW2A and F; the strongest
> I've ever heard. Even the AirSpy did detect a signal, although
> not-at-all as great as the IC820H. To get a cleaner signal from the
> IC820H I did have to engage the attenuator on the set, though. Using the
> IC820H I also heard a very weak beacon signal from CO-65, but the AirSpy
> failed there. Conclusion: the IC820H could detect signals that the
> AirSpy could not detect at all or detect them much better.
>
> Pretty happy with this step forward, but not satisfied. Question is how
> to improve even more.
>
> Q1: is the LNA desensing the AirSpy (and to a lesses extend, the IC820H)
> and if so, how to fix that? I read something about an attenuation
> network after the LNA to improve the front-end of the receiver. Might
> that help?
>
> Q2: when not powered, MMICs seem to have a very high insertion loss. Is
> there a way to remotely bypass the LNA in order to compare reception
> with and without the LNA?
>
> Q3: would filtering help? E.g. bandpass filters for 2m and 70cm. I do
> realize that this would mean another couple of dB of insertion loss, but
> maybe that disadvantage outweighs the advantages.
>
> I would appreciate any input on the above and also would like to hear
> from others who use the AirSpy Mini for sat reception. I already did a
> lot of googling, but can't find any clear cut answers. Hope you all can
> help me go into the right direction. Cheers,
>
> Hans
> BX2ABT
>
> _______________________________________________
> 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: Fri, 13 Jul 2018 12:08:37 -0400
From: Zach Leffke <zleffke@??.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] AO-92 Camera Passes this week -- A big fat THANK
YOU!!
Message-ID: <390975d7-610a-f68e-1429-9c7888107d61@??.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Hello fellow AMSAT'ers,
I just wanted to send out a quick thanks to all for supporting the
camera passes over the last couple days.? We did a demo here at VT on
7/12 for a large group of Middle Schoolers and they were definitely
wowed by the Camera images.? We were also able to monitor a bit of audio
on the FM downlink as the satellite rose on Blacksburg, but before it
was kicked into Camera Mode.? I was able to show them the footprint with
our tracking program and explained how we wouldn't start to see images
until the footprint crossed into Florida in order for Drew to kick the
bird into camera mode. Before the pass I had them guess what kinds of
things we might see, and they were pretty excited when they saw their
guesses were pretty close (clouds, coastlines, ocean, etc........one kid
was disappointed that there were no aliens...:-) ).
While we were able to get a good number of images direct in Blacksburg
(including the shot of Cape Cod, Pic 86), it was very reassuring to know
if I bungled the local station demo that I could jump to the website and
show them images there collected from the community!? So many thanks to
all out there for the backup.? And many thanks to Drew and the Ops Team
for accommodating us with the Camera Mode request.? It felt really great
showing kids visiting VT images from Space from a camera built at VT!
Overall great success!.....Made possible in no small part thanks to the
entire AMSAT community.? So on behalf of VT....THANK YOU !!!!!
-Zach, KJ4QLP
--
Research Associate
Aerospace Systems Lab
Ted & Karyn Hume Center for National Security & Technology
Virginia Polytechnic Institute & State University
Work Phone: 540-231-4174
Cell Phone: 540-808-6305
------------------------------
Message: 5
Date: Fri, 13 Jul 2018 12:27:22 -0400
From: Zach Leffke <zleffke@??.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] AO-92 1626UTC 7/12 PASS CAMERA TEST
Message-ID: <fd83f37c-5369-d5e7-af78-4b77994ec3f6@??.???>
Content-Type: text/plain; charset=utf-8; format=flowed
We also experienced a good bit of QRM on the the AO-92 downlink towards
the end of the pass previous to the one mentioned in the subject line
(~1450 UTC) during our demo yesterday.? We had the same problem (though
less of an effect) the day prior during testing of our setup, but
slightly offset in time (the QRM showed up just before the 7/11 ~1515
UTC AO-92 pass).? Definitely had the doppler shift features indicating
it was another satellite in the 2m band and close to the AO-92
downlink.? On the 7/12 1450UTC pass, the interferer was strong enough
that it 'edged out' the AO-92 downlink and was captured by our doppler
correction loop (ending the demo, but that was OK because we already got
a few images direct, and then I jumped to the website to show them more
images recovered by the community).
We used GNU Radio married to FoxTelem for the passes.? I have the
recorded IQ files for both passes where the , but haven't had a chance
to go back and investigate what exactly was going on or hunt for which
bird was the 'culprit' though now it seems CAS-4B is a good
suspect......If I get a chance I'll play around with the flowgraph and
see if I can manually tune in the AO-92 signal and filter out the
interferer to see if I can recover any more telemetry/camera pieces.
Just offering another data point and similar experiences...
-Zach, KJ4QLP
Research Associate
Aerospace Systems Lab
Ted & Karyn Hume Center for National Security & Technology
Virginia Polytechnic Institute & State University
Work Phone: 540-231-4174
Cell Phone: 540-808-6305
On 7/13/2018 4:29 AM, John wrote:
> Hi Hal,
>
> I too have an FT-847, however instead of programming satellites into the
memories, I let SatPC32 'get it right' for me, along with tuning for doppler
and handling tones etc. It's a far easier solution.
>
> Otherwise, you could go through the AMSAT OSCAR Status page, and grab all
the birds you're likely to want to work from that list.
>
> 73,
> John (XLX)
>
> -----Original Message-----
> From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Hal Dale
> Sent: 12 July 2018 19:09
> Cc: amsat-bb@?????.???
> Subject: Re: [amsat-bb] AO-92 1626UTC 7/12 PASS CAMERA TEST
>
> I have a FT847. Anyone have a suggested list of Sats to input in the
memory?? Hal/WB4AEG _______________________________________________
> 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: 6
Date: Fri, 13 Jul 2018 16:23:04 +0000 (UTC)
From: Anthony Wiese <anthonywiese@?????.???>
To: AMSAT BB <amsat-bb@?????.???>
Subject: [amsat-bb] CM79
Message-ID: <68673045.3560414.1531498984837@????.?????.???>
Content-Type: text/plain; charset=UTF-8
Hello All,? Look for me this afternoon's two passes of SO-50 from CM79.?
Moved the trip one day early because of weather concerns for the weekend.?
Thunderstorms, excessive heat warnings, etc.? Have no fear if you miss me.?
Again, this is more of recon mission for a grander activation later on in
the year.Cheers,Anthony
------------------------------
Message: 7
Date: Fri, 13 Jul 2018 10:25:08 -0700
From: Bryan KL7CN <bryan@?????.???>
To: Anthony Wiese <anthonywiese@?????.???>
Cc: AMSAT BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] CM79
Message-ID: <4BE5FA81-7524-4C52-9EB7-AC07B39EA5E0@?????.???>
Content-Type: text/plain; charset=us-ascii
Anthony, well done!
Will you use LotW for confirmation?
-- bag
Bryan KL7CN/W6
Location: CM98, usually
E-Mail: bryan@?????.???
Telephone/SMS: 408-836-7279
> On Jul 13, 2018, at 09:23, Anthony Wiese via AMSAT-BB <amsat-bb@?????.???>
wrote:
>
> Hello All, Look for me this afternoon's two passes of SO-50 from CM79.
Moved the trip one day early because of weather concerns for the weekend.
Thunderstorms, excessive heat warnings, etc. Have no fear if you miss me.
Again, this is more of recon mission for a grander activation later on in
the year.Cheers,Anthony
> _______________________________________________
> 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: Fri, 13 Jul 2018 13:28:58 -0500
From: Clayton Coleman W5PFG <tasmac@?????.??>
To: AMSAT-BB <amsat-bb@?????.???>
Subject: [amsat-bb] New Mexico Museum of SPACE HISTORY
Message-ID: <458462c1-1bd5-ab12-120f-b7ad33d4b99f@?????.??>
Content-Type: text/plain; charset=utf-8; format=flowed
A few weeks ago, my wife and I were on a small road trip around New
Mexico and stumbled upon the most delightful discovery... The New Mexico
Museum of SPACE HISTORY.
We had planned for lunch in Alamogordo and a quick visit to White Sands
National Monument, but the museum made it into a longer visit.
It is not a large museum by any means. Some of the artifacts may be
things you have seen at other space museums but it is most definitely
worth a few hours of your time. The location and its view of White Sands
off in the distance is impressive. The architect and team that laid out
the exhibits get an A+ for flow and content.
http://www.nmspacemuseum.org/
73,
Clayton
W5PFG
------------------------------
Message: 9
Date: Fri, 13 Jul 2018 20:22:24 +0100
From: "Jim Heck" <jim@??????.??.???>
To: "AMSAT" <amsat-bb@?????.???>, <funcube@???????????.??.??>
Subject: Re: [amsat-bb] AO73/FUNcube-1 Operations
Message-ID: <5B82275FAE46463F85D52CD8B17D0FF7@??????>
Content-Type: text/plain; format=flowed; charset="utf-8";
reply-type=response
Hi All,
The spacecraft is now operating in continuous transponder mode. Plan is to
switch to Educational mode on Sunday PM UTC as usual.
Have fun
73
Jim G3WGM and the FUNCube team
------------------------------
Message: 10
Date: Fri, 13 Jul 2018 16:07:44 -0400
From: John Brier <johnbrier@?????.???>
To: Zach Leffke <zleffke@??.???>
Cc: AMSAT BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] AO-92 Camera Passes this week -- A big fat
THANK YOU!!
Message-ID:
<CALn0fKOFOqpNG=w4h9XFDq+txx-rLxonjC=Qve4zXd7MdvpWiA@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Awesome Zach.
Thats sounds like it was a fun time.
Congrats to all involved in making things like this possible.
73, John Brier KG4AKV
On Fri, Jul 13, 2018, 12:16 Zach Leffke <zleffke@??.???> wrote:
> Hello fellow AMSAT'ers,
>
> I just wanted to send out a quick thanks to all for supporting the
> camera passes over the last couple days. We did a demo here at VT on
> 7/12 for a large group of Middle Schoolers and they were definitely
> wowed by the Camera images. We were also able to monitor a bit of audio
> on the FM downlink as the satellite rose on Blacksburg, but before it
> was kicked into Camera Mode. I was able to show them the footprint with
> our tracking program and explained how we wouldn't start to see images
> until the footprint crossed into Florida in order for Drew to kick the
> bird into camera mode. Before the pass I had them guess what kinds of
> things we might see, and they were pretty excited when they saw their
> guesses were pretty close (clouds, coastlines, ocean, etc........one kid
> was disappointed that there were no aliens...:-) ).
>
> While we were able to get a good number of images direct in Blacksburg
> (including the shot of Cape Cod, Pic 86), it was very reassuring to know
> if I bungled the local station demo that I could jump to the website and
> show them images there collected from the community! So many thanks to
> all out there for the backup. And many thanks to Drew and the Ops Team
> for accommodating us with the Camera Mode request. It felt really great
> showing kids visiting VT images from Space from a camera built at VT!
>
>
> Overall great success!.....Made possible in no small part thanks to the
> entire AMSAT community. So on behalf of VT....THANK YOU !!!!!
>
>
>
> -Zach, KJ4QLP
>
> --
> Research Associate
> Aerospace Systems Lab
> Ted & Karyn Hume Center for National Security & Technology
> Virginia Polytechnic Institute & State University
> Work Phone: 540-231-4174
> Cell Phone: 540-808-6305
>
> _______________________________________________
> 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: 11
Date: Fri, 13 Jul 2018 16:45:21 -0400
From: aj9n@???.???
To: amsat-bb@?????.???
Subject: [amsat-bb] Upcoming ARISS Contact Schedule as of 2018-07-13
21:00 UTC
Message-ID: <16495641330-c8b-4db3@?????????????.???.???????.???>
Content-Type: text/plain; charset=utf-8
Upcoming ARISS Contact Schedule as of 2018-07-13 21:00 UTC
Quick list of scheduled contacts and events:
Space Port Area Conference for Educators (SPACE), Kennedy Space Center, FL
(CASIS#4) participating school Burns Science & Technology Charter School,
Oak Hill, FL, telebridge via W6SRJ (***)
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Ricky Arnold KE5DAU
Contact was successful: Fri 2018-07-13 14:00:22 UTC 42 deg (***)
?
Essex Heights Primary School, Melbourne, Victoria, Australia, telebridge via
VK4KHZ
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Serena Aunon-Chancellor KG5TMT
Contact is a go for: Tue 2018-07-17 08:24:52 UTC 85 deg
?
7th International Aerospace School. I.N. Sultanova Rep. Bashkortostan, Ufa,
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 2018-07-20 20:15 UTC
?
?
******************************************************************************
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 129
Gaston ON4WF with 123
Sergey RV3DR with 103
****************************************************************************
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?2018-07-13 21:00 UTC.? (***)
Here you will find a listing of all scheduled?school contacts, and
questions, other ISS related websites, IRLP and?Echolink websites, and
instructions for any contact that may be streamed?live.??
http://www.amsat.org/amsat/ariss/news/arissnews.rtf
http://www.amsat.org/amsat/ariss/news/arissnews.txt
Total number?of ARISS ISS to earth school events is 1237. (***)
Each school counts as 1?event.
Total number of ARISS ISS to earth school contacts is 1185. (***)
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:
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 2018-07-13 21:00 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. 55 on orbit
Drew Feustel
Oleg Artemyev
Ricky Arnold KE5DAU
?
Exp. 56 on orbit
Serena Aunon-Chancellor KG5TMT
Alexander Gerst KF5ONO
Sergei Propopev
****************************************************************************
73,
Charlie?Sufana AJ9N
One of the ARISS operation team mentors
?
?
?
?
?
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?
?
?
------------------------------
Message: 12
Date: Sat, 14 Jul 2018 11:01:10 +0800
From: Hans BX2ABT <hans.bx2abt@???.?????.???>
To: Ryan Butler <rbutler@????.???>
Cc: amsat-bb <amsat-bb@?????.???>
Subject: Re: [amsat-bb] AirSpy & LNA questions
Message-ID: <22806971-2b20-ed75-6e35-d34dc04b299d@???.?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Hello Ryan,
Thanks for your reply. The article was very interesting, but as stated:
finding SAW filters suitable for other bands might prove difficult. Up
till now I haven't found a suitable SAW filter for 2 meters. The helical
filters are easier to get as Temell has a range especially suited for
ham bands. They're a Taiwanese company, so this time I'm lucky and can
order them locally.
As someone else pointed out: an FM band notch filter might also help, so
that will get on my list as well.
73 de Hans
BX2ABT
On 07/13/2018 10:41 PM, Ryan Butler wrote:
> Yes you are on the right track, check out the following two links
> (similar designs) but also provides a description of why bandpass
> filtering is a must with an SDR.
>
>
https://www.rtl-sdr.com/designing-low-noise-uhf-front-end-sharp-filtering-sdr/
>
https://sivantoledotech.wordpress.com/2015/01/27/a-selective-and-robust-uhf-fr
ont-end/
>
> Ryan, NF0T
>
>
> On Fri, Jul 13, 2018 at 9:30 AM Hans BX2ABT <hans.bx2abt@???.?????.???
> <mailto:hans.bx2abt@???.?????.???>> wrote:
>
> Man, this sat stuff is difficult and I was getting a bit
> frustrated with
> lack of progress, to be honest. But just when I thought I didn't get
> anywhere, I went a big leap forward. But I'm not there yet, so I need
> your input.
>
> My goal is to get some decent reception of the major telemetry sats,
> e.g. Funcube-1. I have two rigs: an ICOM IC820H and an AirSpy Mini
> SDR
> running on a Linux box with GQRX as front-end. I have a Chinese Arrow
> Alaska clone pointing 200 degrees with 20 degree elevation. The other
> antenna currently is a turnstile tuned for 137 MHz, but I have
> 2/70 DCAs
> as well (they had to come down this week because of a typhoon.
> Will be
> up again shortly).
>
> The bare antennas do fine on terrestrial signals, but up till now
> very
> few sats were heard (mostly the Xiwang sats and Athenoxat-1) and
> signals
> were very very weak. I got myself some proto boards and PGA103+ MMICs
> and built two LNAs according to schematics found on the web. On the
> workbench they perform as they should and give some 15-25 dB gain
> depending on what frequency is used. I use an old AM/FM signal
> generator
> and an RTL-SDR as crude scope since I don't have a real one.
>
> I mounted the LNAs as close as possible to the antennas and they
> are fed
> with a bias-T from Minikits.com.au <http://Minikits.com.au>. The
> first results were
> disappointing: I used the AirSpy and noticed a lot more signal but
> also
> an increased noise floor. With the AirSpy there is a lot of fiddling
> going on in the software and I managed to get some improvement by
> tweaking the LNA gain, Mix gain and IF gain. Still I couldn't hear
> any
> sat signals.
>
> This afternoon I switched from the AirSpy to the IC820H and
> lo-and-behold very strong beacon signals from XW2A and F; the
> strongest
> I've ever heard. Even the AirSpy did detect a signal, although
> not-at-all as great as the IC820H. To get a cleaner signal from the
> IC820H I did have to engage the attenuator on the set, though.
> Using the
> IC820H I also heard a very weak beacon signal from CO-65, but the
> AirSpy
> failed there. Conclusion: the IC820H could detect signals that the
> AirSpy could not detect at all or detect them much better.
>
> Pretty happy with this step forward, but not satisfied. Question
> is how
> to improve even more.
>
> Q1: is the LNA desensing the AirSpy (and to a lesses extend, the
> IC820H)
> and if so, how to fix that? I read something about an attenuation
> network after the LNA to improve the front-end of the receiver. Might
> that help?
>
> Q2: when not powered, MMICs seem to have a very high insertion
> loss. Is
> there a way to remotely bypass the LNA in order to compare reception
> with and without the LNA?
>
> Q3: would filtering help? E.g. bandpass filters for 2m and 70cm. I do
> realize that this would mean another couple of dB of insertion
> loss, but
> maybe that disadvantage outweighs the advantages.
>
> I would appreciate any input on the above and also would like to hear
> from others who use the AirSpy Mini for sat reception. I already
> did a
> lot of googling, but can't find any clear cut answers. Hope you
> all can
> help me go into the right direction. Cheers,
>
> Hans
> BX2ABT
>
> _______________________________________________
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> to all interested persons worldwide without requiring membership.
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> are solely those of the author, and do not reflect the official
> views of AMSAT-NA.
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> program!
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>
------------------------------
Subject: Digest Footer
_______________________________________________
Sent via amsat-bb@?????.???.
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without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of
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Not an AMSAT member? Join now to support the amateur satellite program!
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