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Today's Topics:
1. Re: Observations on AO-91 AFC (Scott)
2. Upcoming ARISS contact with Ashbury College, Ottawa, Ontario,
Canada (n4csitwo@xxxxxxxxx.xxxx
3. Re: Observations on AO-91 AFC (Matthew Stevens)
4. AO 91 Pass over India and South east asis (Nitin Muttin)
5. SatPC32 12.8c help! (Ted)
6. Re: SatPC32 12.8c help! (Dave Taylor)
7. AO73/FUNcube-1 Operations (Graham Shirville)
8. Re: High Speed Telemetry, SDR#, and RTS/SDR (Chris Thompson)
9. "Reverse" bias-tee ?? (Scott)
10. TNC3S High-Speed dual port Packet-Controller - FS -
(Stefan Wagener)
11. 11/25 AO-91 recording (Mike Thompson)
----------------------------------------------------------------------
Message: 1
Date: Sat, 25 Nov 2017 21:52:06 -0600
From: Scott <ka9p@xxx.xxx>
To: Matthew Stevens <matthew@xxxxxxxxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Observations on AO-91 AFC
Message-ID: <50A1DC0B-11E3-4673-AC78-7C056782D61B@xxx.xxx>
Content-Type: text/plain; charset=utf-8
Matt?s observations beg the question of what the design basis of the AFC
system might be- single signal or a number of signals of varying amplitude
and frequency.
In the end it may not matter much, but if understanding better how it works
leads to more enlightened use of the bird than a few of the (obviously
there?s still learning going on) passes this weekend, it could be very
helpful.
Thanks for any info or guidance you engineering guys may have, and again,
congrats on a super job.
73 Scott ka9p
Make something good happen!
> On Nov 25, 2017, at 8:09 PM, Matthew Stevens <matthew@xxxxxxxxx.xxx> wrote:
>
> I?ve done a bit of study on the Fox series AFC. I never really knew
> much about it up until this point, but with all the discussion on the
> amsat-bb about AO-91?s AFC function, and the alleged lack of uplink
> Doppler tuning needed ? I figured I should educate myself a bit more.
>
> I also wanted to test it out some. My observations (which I?ve
> outlined in another BB post
> http://www.amsat.org/pipermail/amsat-bb/2017-November/065569.html),
> making hundreds of QSOs on AO-85 using various antennas, radios, and
> power settings have been that there is definite need to tune the
> uplink frequency for Doppler shift. My initial experiences working
> passes on AO-91 from a few minutes after commissioning, using an HT
> and whip, then an HT and Elk, then and HT and arrow, did nothing to
> change my mind about tuning for the AO-91 uplink.
>
> However, even though I already made a bunch of QSOs on AO91, I didn?t
> really have enough data to make any kind of real conclusion about the
> AFC on AO-91. So, I figured I?d try some experiments and post them
> here!
>
>>>
>
> Today was the first pass I had worked on AO-91 with anything other
> than a 0.05-5w Kenwood D72 HT for a radio. I broke out my Icom 821H
> for a 90 degree lunchtime pass, turned up the power to the full ~35w,
> and used my handheld arrow II antenna. Having already heard the
> absolute zoo that has been daytime AO-91 passes, I was curious first
> to hear how it went using more power (as far as being able to get in
> over the dead carriers and multiple hetrodyning uplinks), and second,
> how the AFC functioned with a lot of high-power users.
>
> What I found: The AFC *does* seem to work! However, there are some
> usage caveats that I have to note. When there is a single signal
> coming into the bird, it seems to compensate fine for being off
> frequency (within reason). I didn?t try too wide of a tuning range,
> since compared to some stations I heard today I didn?t have enough
> power to be way off (more on that in a minute). But I did try +/-
> about 5khz, and it seemed to compensate just fine if I was the only
> signal coming in.
>
> That?s the rub however. There was virtually no time today where I was
> the only signal coming into the bird! And when there was a bunch of
> different signals, basically, the strongest uplink was the one that
> determined the AFC tuning. You can hear that happening in the
> recording which I?ll link to below. There was more than one instance
> where I began to transmit over a carrier or other signal that I was
> hearing (being careful not to transmit over any actual audible callers
> or QSOs in progress). You can hear my audio go from poor to crystal
> clear as the AFC (apparently) adjusted to my carrier ? and I did not
> adjust my transmit frequency at the time. I assume that my signal was
> stronger than the others, and the AFC ?picked? mine.
>
> You can also hear a signal from XE3ARV, who had by far the strongest
> signal I heard during the pass. Because his uplink signal was so much
> stronger than anyone or anything else, it sounded like the AFC
> adjusted to whatever his uplink frequency was. If I, or anyone else
> was transmitting at the time, you can hear it IMMEDIATELY go from the
> other clear (or scratchy) signal (depending on what state the AFC
> tuning was in at the time), to a crystal clear downlink from XE3ARV.
>
> Another observation of note was the downlink signal from 5K0T. At the
> beginning of the pass you can hear a very clear signal from their
> obviously strong uplink. As the pass progressed, the audio quality on
> their downlink deteriorated a lot. The only reason I can see for this
> is that they may have not been adjusting for Doppler during the pass,
> and were possibly 10khz or more from the correct uplink frequency
> (perhaps transmitting at 435.240 the entire pass?). I can?t confirm
> this as I wasn?t there to see what was happening on their end, but
> that is one possible explanation to why their signal sounded like it
> did at the end of the pass. This hypothesis also is supported by
> having heard another station on a much quieter, early morning pass the
> other day who I know was transmitting 30khz off frequency. His audio
> sounded very similar to 5K0T at the time.
>
> Yet another observation is that when there are a lot of users on the
> pass, it seems to be beneficial to adjust for Doppler. There were
> several times during today?s pass where I did tune my radio to the
> correct, Doppler adjusted uplink frequency. If there was a high level
> of QRM, tuning for Doppler seemed to help my signal be received by the
> satellite, as opposed to tuning +/- 5khz from the Doppler adjusted
> value.
>
> Here is my recording:
> https://drive.google.com/open?id=1c8XYCoxFCKCyR4dtfwJCyM9tjfo1mLKd
>
> TL;DR observations:
>
> 1. AFC does work within some limitations.
>
> 2. With multiple strong signals into the bird, the strongest ?wins? as
> far as determining the AFC adjustment. This makes other signals tuned
> to other frequencies sound ?staticky?
>
> 3. Transmitting very far off frequency makes your downlink audio sound bad.
>
> 4. Adjusting for Doppler seems to help your signal capture the sats
> receiver better than other users who are operating at a similar power
> level to you.
>
> Conclusion so far: In practice, AFC is good for correcting minor
> Doppler tuning errors. However, unless there is only one user
> transmitting into the sat at a point in time, it does not eliminate
> the need to tune your uplink for Doppler.
>
> I would be curious to hear other observations and interpretations from
> AO-91 passes. I think it?s helpful to support observations with
> recordings, so others can listen and draw their own conclusions about
> your interpretation of what has occurred.
>
> Also, these are just my initial impressions from operating passes?and
> these are subject to change over time :-)
>
>
>
> 73,
>
> Matthew nj4y
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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: Sat, 25 Nov 2017 23:15:01 -0500
From: <n4csitwo@xxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>, "amsat-edu" <amsat-edu@xxxxx.xxx>,
<ariss-press@xxxxx.xxx>
Subject: [amsat-bb] Upcoming ARISS contact with Ashbury College,
Ottawa, Ontario, Canada
Message-ID: <CB5C54BD3A84493AA51A78AAE1174426@xxx>
Content-Type: text/plain; charset="iso-8859-1"
An International Space Station school contact has been planned with
participants at Ashbury College, Ottawa, Ontario, Canada on 27 Nov. The
event is scheduled to begin at approximately 18:39 UTC. It is recommended
that you start listening approximately 10 minutes before this time. The
duration of the contact is approximately 9 minutes and 30 seconds. The
contact will be a telebridge between NA1SS and VK4KHZ. The contact should be
audible over Australia and adjacent areas. Interested parties are invited to
listen in on the 145.80 MHz downlink. The contact is expected to be
conducted in English.
Ashbury College is an independent academic institution in the heart of
Canada's Capital. From grades 4 to 12, students are prepared for
post-secondary education, all while cultivating a strong sense of community
engagement, and independent learning. We are part of the International
Baccalaureate program and have a deep involvement in the Round Square
initiative as well as additional science and math programs. We as a school
believe that our participation in the ARISS communication session with the
International Space Station would provide valuable and relevant information
to our students, as well as reflect our roots in Internationalism, and STEM.
The students attending the broadcast will be all of the grade 9 and 10
students, as well as students in the Space and Science course and
Kinesiology course.
Participants will ask as many of the following questions as time allows:
1) Microgravity has shown to cause a decrease in muscle mass which can impact
muscle strength, endurance, contraction, and other key muscular
activities. What are some ways that you prevent muscular atrophy in zero
gravity and how do you prepare for this prior to space flight?
2) How do you adjust to a sleep cycle on the ISS (the sun sets 16 times)? How
do you re-adjust to a sleep cycle when you return to Earth?
3) What do you miss most about Earth while on the ISS?
4) Funding excepted, what are the obstacles to adding an artificial gravity
module to the ISS, considering the potential benefits astronauts could
receive from it during long-term space missions?
5) What was the application process like to become an astronaut? What set you
apart from your peers?
6) How do the plants grown on the ISS differ from those on Earth? Are there
any sustaining food sources?
7) What type of projects/research do you do in outer space and what is your
favourite experiment to work on the ISS?
8) In space, the loss of bone mass is found to be up to 10x the amount of
osteoporosis. On earth, one of the ways we prevent bone loss is by
increasing resistance training, however, there is no resistance in zero
gravity. How do you prepare for and cope with this bone loss in a micro-
gravitational environment before, during and after space flight,
especially when you are up there for longer periods of time (i.e. 6
months)? Does this affect things like healing bone fractures?
9) What do you do for fun?
10) What is the most frustrating/exciting part of being an astronaut?
11) What were your first thoughts when arriving at the ISS? Any fear or just
excitement?
12) How will things be different with the new space station planned to orbit
the moon compared to the International Space Station?
13) How do you bathe?
PLEASE CHECK THE FOLLOWING FOR MORE INFORMATION ON ARISS UPDATES:
Visit ARISS on Facebook. We can be found at Amateur Radio on the
International Space Station (ARISS).
To receive our Twitter updates, follow @xxxxxxxxxxxx
Next planned event(s):
1. Huntley Centennial Public School, Carp, ON, Canada, telebridge via IK1SLD
The ISS callsign is presently scheduled to be IR?ISS
The scheduled astronaut is Paolo Nespoli
Contact is a go for: Tue 2017-11-28 18:46 UTC
2. S.G.B. De La Salle, Rome, Italy and Istituto Comprensivo Luigi Nono,
Mira,
Italy, telebridge via W6SRJ
The ISS callsign is presently scheduled to be IR?ISS
The scheduled astronaut is Paolo Nespoli IZ?JPA
Contact is a go for: Thu 2017-11-30 08:04 UTC
3. Bishop Hendricken High School and its sister school, St. Mary Academy -
Bay View, Warwick, RI, telebridge via IK1SLD
The ISS callsign is presently scheduled to be IR?ISS
The scheduled astronaut is Paolo Nespoli
Contact is a go for: Thu 2017-11-30 17:02 UTC
About ARISS:
Amateur Radio on the International Space Station (ARISS) is a cooperative
venture of international amateur radio societies and the space agencies that
support the International Space Station (ISS). In the United States,
sponsors are the Radio Amateur Satellite Corporation (AMSAT), the American
Radio Relay League (ARRL), the Center for the Advancement of Science in
Space (CASIS) and National Aeronautics and Space Administration (NASA).
The primary goal of ARISS is to promote exploration of science, technology,
engineering, and mathematics (STEM) topics by organizing scheduled contacts
via amateur radio between crew members aboard the ISS and students in
classrooms or informal education venues. With the help of experienced
amateur radio volunteers, ISS crews speak directly with large audiences in a
variety of public forums. Before and during these radio contacts, students,
teachers, parents, and communities learn about space, space technologies,
and amateur radio. For more informa
tion, see www.ariss.org, www.amsat.org, and www.arrl.org.
Thank you & 73,
David - AA4KN
---
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------------------------------
Message: 3
Date: Sun, 26 Nov 2017 01:49:51 -0500
From: Matthew Stevens <matthew@xxxxxxxxx.xxx>
To: Scott <ka9p@xxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Observations on AO-91 AFC
Message-ID: <45C5E023-6F20-4713-B32A-07A560418709@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Update from the 0617z pass just now. Using a D72 and arrow, I tried
transmitting adjusted for doppler shift, then changing from that doppler
adjusted frequency first to 15khz low, then 10khz, 5, and finally back to
the correct frequency. All on a much quieter pass than earlier, only 6 or 7
stations on at this time of the morning.
At -15khz, I was still easily able to access the repeater. However my audio
was extremely muffled sounding, and difficult to understand. Another station
on the pass reported it sounding ?extremely garbled.? I shifted to -10khz,
and got the report back that my audio was clear and understandable. To my
ears (full duplex), it still sounded a bit muffled but much better than
before. Shifting back to -5khz, and then the approximate correct doppler
adjusted uplink, I couldn?t really tell the difference between -5 and 0.
So, conclusion. The AFC seems to be working as advertised! With a 5w HT and
arrow I had no problem getting in on a slow pass even 15khz off freq, albeit
with terrible audio. However, while 10khz off was acceptable, +/-5khz was
what I would consider ?good.?
My advice is to use the AFC as an aid, not a crutch. Don?t count on it to
correct a large tuning error very well, especially on a busy pass with more
than one user transmitting simultaneously.
Keep tuning for doppler on your uplink like you have been for AO-85, but
don?t worry too much about being exact with it on AO-91. The AFC will ?fix?
it if you?re off a few kHz.
As a side note, once again tonight I was hugely impressed with the audio
quality, ease accessing the repeater, and horizon to horizon performance of
the new sat! Amsat really scored with this one.
73,
- Matthew nj4y
Sent from my iPhone
> On Nov 25, 2017, at 22:52, Scott <ka9p@xxx.xxx> wrote:
>
> Matt?s observations beg the question of what the design basis of the AFC
system might be- single signal or a number of signals of varying amplitude
and frequency.
>
> In the end it may not matter much, but if understanding better how it
works leads to more enlightened use of the bird than a few of the (obviously
there?s still learning going on) passes this weekend, it could be very
helpful.
>
> Thanks for any info or guidance you engineering guys may have, and again,
congrats on a super job.
>
> 73 Scott ka9p
>
> Make something good happen!
>
>> On Nov 25, 2017, at 8:09 PM, Matthew Stevens <matthew@xxxxxxxxx.xxx> wrote:
>>
>> I?ve done a bit of study on the Fox series AFC. I never really knew
>> much about it up until this point, but with all the discussion on the
>> amsat-bb about AO-91?s AFC function, and the alleged lack of uplink
>> Doppler tuning needed ? I figured I should educate myself a bit more.
>>
>> I also wanted to test it out some. My observations (which I?ve
>> outlined in another BB post
>> http://www.amsat.org/pipermail/amsat-bb/2017-November/065569.html),
>> making hundreds of QSOs on AO-85 using various antennas, radios, and
>> power settings have been that there is definite need to tune the
>> uplink frequency for Doppler shift. My initial experiences working
>> passes on AO-91 from a few minutes after commissioning, using an HT
>> and whip, then an HT and Elk, then and HT and arrow, did nothing to
>> change my mind about tuning for the AO-91 uplink.
>>
>> However, even though I already made a bunch of QSOs on AO91, I didn?t
>> really have enough data to make any kind of real conclusion about the
>> AFC on AO-91. So, I figured I?d try some experiments and post them
>> here!
>>
>>>>
>>
>> Today was the first pass I had worked on AO-91 with anything other
>> than a 0.05-5w Kenwood D72 HT for a radio. I broke out my Icom 821H
>> for a 90 degree lunchtime pass, turned up the power to the full ~35w,
>> and used my handheld arrow II antenna. Having already heard the
>> absolute zoo that has been daytime AO-91 passes, I was curious first
>> to hear how it went using more power (as far as being able to get in
>> over the dead carriers and multiple hetrodyning uplinks), and second,
>> how the AFC functioned with a lot of high-power users.
>>
>> What I found: The AFC *does* seem to work! However, there are some
>> usage caveats that I have to note. When there is a single signal
>> coming into the bird, it seems to compensate fine for being off
>> frequency (within reason). I didn?t try too wide of a tuning range,
>> since compared to some stations I heard today I didn?t have enough
>> power to be way off (more on that in a minute). But I did try +/-
>> about 5khz, and it seemed to compensate just fine if I was the only
>> signal coming in.
>>
>> That?s the rub however. There was virtually no time today where I was
>> the only signal coming into the bird! And when there was a bunch of
>> different signals, basically, the strongest uplink was the one that
>> determined the AFC tuning. You can hear that happening in the
>> recording which I?ll link to below. There was more than one instance
>> where I began to transmit over a carrier or other signal that I was
>> hearing (being careful not to transmit over any actual audible callers
>> or QSOs in progress). You can hear my audio go from poor to crystal
>> clear as the AFC (apparently) adjusted to my carrier ? and I did not
>> adjust my transmit frequency at the time. I assume that my signal was
>> stronger than the others, and the AFC ?picked? mine.
>>
>> You can also hear a signal from XE3ARV, who had by far the strongest
>> signal I heard during the pass. Because his uplink signal was so much
>> stronger than anyone or anything else, it sounded like the AFC
>> adjusted to whatever his uplink frequency was. If I, or anyone else
>> was transmitting at the time, you can hear it IMMEDIATELY go from the
>> other clear (or scratchy) signal (depending on what state the AFC
>> tuning was in at the time), to a crystal clear downlink from XE3ARV.
>>
>> Another observation of note was the downlink signal from 5K0T. At the
>> beginning of the pass you can hear a very clear signal from their
>> obviously strong uplink. As the pass progressed, the audio quality on
>> their downlink deteriorated a lot. The only reason I can see for this
>> is that they may have not been adjusting for Doppler during the pass,
>> and were possibly 10khz or more from the correct uplink frequency
>> (perhaps transmitting at 435.240 the entire pass?). I can?t confirm
>> this as I wasn?t there to see what was happening on their end, but
>> that is one possible explanation to why their signal sounded like it
>> did at the end of the pass. This hypothesis also is supported by
>> having heard another station on a much quieter, early morning pass the
>> other day who I know was transmitting 30khz off frequency. His audio
>> sounded very similar to 5K0T at the time.
>>
>> Yet another observation is that when there are a lot of users on the
>> pass, it seems to be beneficial to adjust for Doppler. There were
>> several times during today?s pass where I did tune my radio to the
>> correct, Doppler adjusted uplink frequency. If there was a high level
>> of QRM, tuning for Doppler seemed to help my signal be received by the
>> satellite, as opposed to tuning +/- 5khz from the Doppler adjusted
>> value.
>>
>> Here is my recording:
>> https://drive.google.com/open?id=1c8XYCoxFCKCyR4dtfwJCyM9tjfo1mLKd
>>
>> TL;DR observations:
>>
>> 1. AFC does work within some limitations.
>>
>> 2. With multiple strong signals into the bird, the strongest ?wins? as
>> far as determining the AFC adjustment. This makes other signals tuned
>> to other frequencies sound ?staticky?
>>
>> 3. Transmitting very far off frequency makes your downlink audio sound bad.
>>
>> 4. Adjusting for Doppler seems to help your signal capture the sats
>> receiver better than other users who are operating at a similar power
>> level to you.
>>
>> Conclusion so far: In practice, AFC is good for correcting minor
>> Doppler tuning errors. However, unless there is only one user
>> transmitting into the sat at a point in time, it does not eliminate
>> the need to tune your uplink for Doppler.
>>
>> I would be curious to hear other observations and interpretations from
>> AO-91 passes. I think it?s helpful to support observations with
>> recordings, so others can listen and draw their own conclusions about
>> your interpretation of what has occurred.
>>
>> Also, these are just my initial impressions from operating passes?and
>> these are subject to change over time :-)
>>
>>
>>
>> 73,
>>
>> Matthew nj4y
>> _______________________________________________
>> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
>> to all interested persons worldwide without requiring membership.
Opinions expressed
>> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 4
Date: Sun, 26 Nov 2017 09:30:20 +0000 (UTC)
From: Nitin Muttin <vu3tyg@xxxxx.xx.xx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] AO 91 Pass over India and South east asis
Message-ID: <645626248.3869144.1511688620076@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Worked 9V1SV at Singapore and vu2pep during the 1815 UTC pass . Great
signals from the satellite. I was using a ICOM W32 with a rubber duck
antenna. Many stations in India were able to hear the downlink on handheld
radios. Thanks AMSAT NA for such a great satellite.
73
Nitin [VU3TYG]
------------------------------
Message: 5
Date: Sun, 26 Nov 2017 08:03:15 -0800
From: "Ted" <k7trkradio@xxxxxxx.xxx>
To: "'AMSAT BB'" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] SatPC32 12.8c help!
Message-ID: <000c01d366d0$11a19830$34e4c890$@xxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi,
I had not started the program in over a year, and yesterday when I decided
to get it functioning again, I get a constant error screen that says:
"Ungultige Gleitkommaoperation" the screen just keeps repeating..and the
tabs are greyed out
I'd rather not delete and reinstall if possible
Any help appreciated
73, Ted
K7TRK
------------------------------
Message: 6
Date: Sun, 26 Nov 2017 11:18:17 -0500
From: Dave Taylor <w8aas@xxxxxxx.xxx>
To: Ted <k7trkradio@xxxxxxx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] SatPC32 12.8c help!
Message-ID: <C252778D-0459-4B46-A49D-4137B292F530@xxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
I?d guess outdated keps (maybe a satellite that has reentered). Try
deleting the keps files and restarting.
Dave
> On Nov 26, 2017, at 11:03 AM, Ted <k7trkradio@xxxxxxx.xxx> wrote:
>
> Hi,
>
>
>
> I had not started the program in over a year, and yesterday when I decided
> to get it functioning again, I get a constant error screen that says:
>
>
>
> "Ungultige Gleitkommaoperation" the screen just keeps repeating..and the
> tabs are greyed out
>
>
>
> I'd rather not delete and reinstall if possible
>
>
>
> Any help appreciated
>
>
>
> 73, Ted
>
> K7TRK
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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: 7
Date: Sun, 26 Nov 2017 18:59:46 -0000
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
To: "AMSAT" <amsat-bb@xxxxx.xxx>, <funcube@xxxxxxxxxxx.xx.xx>
Subject: [amsat-bb] AO73/FUNcube-1 Operations
Message-ID: <E325B7726AB5467794BC617D435BBC9C@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="UTF-8"
Hi All,
Just to advise that AO73/FUNcube-1 is now in autonomous mode. For
operational reasons the switch back to amateur mode for next weekend may not
take place until ?first thing? (UTC) on Saturday 3rd Dec.
Have a great FUN week!
73
Graham
G3VZV
------------------------------
Message: 8
Date: Sun, 26 Nov 2017 15:00:05 -0500
From: Chris Thompson <chrisethompson@xxxxx.xxx>
To: Fred Castello <fredcastello@xxxxx.xxx>
Cc: AMSAT bbs <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] High Speed Telemetry, SDR#, and RTS/SDR
Message-ID:
<CAJOf0+tS2=g8u19jj1HOMrei0DyWXW38aHRdQPFn99VjDGv11g@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset="UTF-8"
Fred,
What bandwidth did you set for the FM channel in sdr#? You can decode the
DUV slow speed telem with a 5kHz channel but the high speed needs to be
15-20kHz.
Chris
On Nov 23, 2017 15:42, "Fred Castello" <fredcastello@xxxxx.xxx> wrote:
> Is anyone using this particular combination with the Fox 1 Telemetry
> Analysis Tool? Today on one of my good passes with AO-91 I believe it was
> transmitting high speed telemetry and it seemed no matter what combination
> I used, I could not get the tool to decode the high speed telemetry. I
> have no problem with the low speed Data Under Voice with this combination.
> I have always assumed that the high speed telemetry is on the same
> frequency as voice and low speed DUV. I would appreciate any thoughts
> anyone has as usual.
> Best Regards,
> Fred ? KF4FC
>
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> expressed
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------------------------------
Message: 9
Date: Sun, 26 Nov 2017 15:02:39 -0500
From: Scott <scott23192@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] "Reverse" bias-tee ??
Message-ID:
<CAJCSnOa+vE0kpDUbgjOuzU-HfatQh7k6+-6=q4NDi+ARWaRcsg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset="UTF-8"
Hi everyone.
The schematic makes me think "yes", but I wanted to check before making a
purchase.
Normally a bias-tee is used to inject a DC voltage onto your coax to power
a pre-amp. Since some pre-amps aren't powered off the coax, but rather
from a separate pair of pins, I was wondering if you can use a bias-tee AT
THE PRE-AMP to extract the DC voltage off our coax for connection to those
external power pins on the pre-amp?
Running a separate cable to power the pre-amp is not the end of the world,
but it would be convenient if I could turn on the bias voltage available on
the Airspy or RTL-SDR and then extract it up at the antenna to power a
pre-amp.
Thanks for any recommendations!
-Scott, K4KDR
------------------------------
Message: 10
Date: Sun, 26 Nov 2017 14:03:31 -0600
From: Stefan Wagener <wageners@xxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] TNC3S High-Speed dual port Packet-Controller - FS
-
Message-ID:
<CAKu8kHADT83PVDfuyJbmgqvg=UHKSzQbMn5XEFtTYPH5DL0EGQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset="UTF-8"
Have a very nice TNC3S high speed dual port packet-controller for sale.
Unit has the 1200 and 9600 boards built in. See:
http://www.symek.com/g/tnc3s.html
for more information and user manuals. Asking $100 shipped within US and
Canada or best offer. Photos on request. If interested, contact me off the
BB. My callsign @ gmail.com
Thanks, Stefan VE4NSA
------------------------------
Message: 11
Date: Sun, 26 Nov 2017 20:24:54 +0000
From: Mike Thompson <zryder94@xxxxx.xxx>
To: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] 11/25 AO-91 recording
Message-ID:
<CAGD5MUHMzuDtZn-vfeYWvELRbRma2C40i+AzFiqtokO9oCk1SQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset="UTF-8"
My audio recorder stopped working mid way through this afternoon?s AO-91
pass over the US. By any chance, did anyone happen to record my contacts?
AE0MT in EN34 with a VE7? station, and I think a N2 station. Thanks for
your help everyone.
------------------------------
Subject: Digest Footer
_______________________________________________
Sent via amsat-bb@xxxxx.xxx.
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 12, Issue 311
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