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CX2SA > SATDIG 07.05.16 22:02l 898 Lines 32579 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: AO-73 telemetry received via FO-29 (Zach Leffke)
2. Upcoming HamTV ??? (Zach Leffke)
3. Re: Upcoming HamTV ??? (JoAnne Maenpaa)
4. Re: Upcoming HamTV ??? (John Brier)
5. Re: Upcoming HamTV ??? (Fer)
6. Re: Upcoming HamTV ??? (Graham Shirville)
7. Re: Upcoming HamTV ??? (Daniel Cussen)
8. Re: Upcoming HamTV ??? (Graham Shirville)
9. Does Sat32PC work with an Icom 7100? (Bruce MacAlister)
10. Re: Does Sat32PC work with an Icom 7100? (George Henry)
----------------------------------------------------------------------
Message: 1
Date: Sat, 7 May 2016 11:14:50 -0400
From: Zach Leffke <zleffke@xx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] AO-73 telemetry received via FO-29
Message-ID: <f622bd43-daed-f33a-4a08-80208d944282@xx.xxx>
Content-Type: text/plain; charset=windows-1252; format=flowed
Many thanks to all for correcting me on the 'first ever' issue. I wasn't
sure if stuff like this had happened in the past, so I appreciate folks
setting me straight. Still a rare case and a hard problem for the
students to work!
Also, many thanks to the folks in the UK for putting up such a useful
educational bird. The students were intentionally not given all of the
information about AO-73 and FO-29 and were told to do a 'Failure
Analysis' to try to think about why the crosslink would fail. The
intent was to get them to do some research and think outside the box a
bit. I was very pleased when one team discovered the weekday/weekend
operating schedule of the satellite and factored that into their
simulation software (weaker beacon power on the weekends reduces the
probability of a succesful TLM crosslink).
Great Stuff!
Thanks to all!
-Zach, KJ4QLP
Research Associate
Ted & Karyn Hume Center for National Security & Technology
Virginia Polytechnic Institute & State University
Work Phone: 540-231-4174
Cell Phone: 540-808-6305
On 5/7/2016 5:49 AM, Graham Shirville wrote:
> Hi All,
>
> Yes there is lots of history for DOHOP operations - for instance see
> ftp://www.amsat.org/amsat/news/1996/spc0401.txt
>
> I can remember when the late G4CUO was very active over here.
>
> Anyway we are always pleased to hear that the telemetry downlinks from
> FUNcube-1 are being used in novel ways.
>
> 73
>
> Graham
> G3VZV
>
> -----Original Message----- From: Alan
> Sent: Saturday, May 07, 2016 12:17 AM
> To: 'Zach Leffke' ; amsat-bb@xxxxx.xxx
> Subject: Re: [amsat-bb] AO-73 telemetry received via FO-29
>
> Zach,
>
> Probably the first telemetry relay, but not quite the first relay. I
> recall literally decades ago
> there was a relay, probably but not definitely from 70 cm to 2 m to 10
> m. It might have included AO-7
> in its first incarnation. Perhaps some of the really OTs might recall
> the details. Still, a great
> achievement. Especially calculating the hop to hop Doppler!
>
> 73s,
>
> Alan
> WA4SCA
>
>
>
>
>
> <-----Original Message-----
> <From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Zach
> Leffke
> <Sent: Friday, May 06, 2016 5:36 PM
> <To: amsat-bb@xxxxx.xxx
> <Subject: Re: [amsat-bb] AO-73 telemetry received via FO-29
> <
> <AHHHHHHHHHH...........
> <
> <you beat me to the punch!!!!!!!!!!!!
> <
> <We also received AO-73's signal via FO-29 today at the VTGS (we only got
> <6 packets!).
> <
> <We did this as part of a class project for ECE-4644 Satellite
> <Communications, and the students that were with me during the
> <observation of the event received a half letter grade bump on their
> <grade for the class project. The student project was to build a piece
> <of simulation software that would predict when the chain events between
> <the two birds would occur and to compute the doppler offset and link
> <budget in one second time steps for each event in a two week period.
> <I'm proud to say they not only predicted when the event would occur,
> <they were SPOT ON in the doppler computation (from around +5 kHz to
> <about +10kHz offset from center of FO-29's downlink here in
> Blacksburg VA).
> <
> <
> <Score for Amateur Radio supporting Students' Education!
> <
> <And Congratulations Paul! If I'm not mistaken, this is a first ever in
> <Amateur Radio satellite work, reception of a crosslink? Way to go!
> <
> <-Zach, KJ4QLP
> <
> <Research Associate
> <Ted & Karyn Hume Center for National Security & Technology
> <Virginia Polytechnic Institute & State University
> <Work Phone: 540-231-4174
> <Cell Phone: 540-808-6305
> <
> <On 5/6/2016 1:11 PM, Paul Stoetzer wrote:
> <> Good afternoon,
> <>
> <> I was able to decode 9 packets of telemetry from AO-73 via FO-29's
> <> transponder at 1647 UTC today. Signals were unusually strong as the
> <> satellites were close together, so I decided to try feeding my
> <> recording of the pass into the Dashboard.
> <>
> <> See an image of the Dashboard and a screenshot from SatPC32 showing
> <> where the two satellites were at the time here:
> <>
> <> https://twitter.com/PRStoetzer/status/728631296658944000
> <>
> <> I was using just an Arrow antenna, High Sierra Microwave LNAA432
> <> preamp, and an FT-817.
> <>
> <> 73,
> <>
> <> Paul, N8HM
> <> _______________________________________________
> <> 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
> <
> <_______________________________________________
> <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
>
>
> _______________________________________________
> 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, 7 May 2016 12:14:09 -0400
From: Zach Leffke <zleffke@xx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Upcoming HamTV ???
Message-ID: <d05c983e-e6f4-fd1a-d61d-f022c13568e7@xx.xxx>
Content-Type: text/plain; charset=utf-8; format=flowed
Hello Everyone,
I noticed that the Monday, 20160509, 0926 UTC planned ARISS contact with
The Kings School in the UK says to watch for the HamTV transmitter.
Does anyone know any more details about the HamTV side of this? More
specifically, it looks like just before the UK contact (descending pass)
there will be a good pass over the Eastern US (ascending pass). What
are the chances that the HamTV transmitter will be active during the
pass over the US? Do they turn the HamTV transmitter on early? Also, I
know they have 4 downlink frequency options and two operating modes.
Does anyone know which frequency and which mode will be selected on
Monday? In the same vein, does anyone know of a good webpage or other
resource for determining the operating schedule of the HamTV transmitter
or is the upcoming contacts page on the ARISS site the best place?
We recently got our 3.0m Dish and S-Band receiver systems installed in
the VTGS and I was hoping to get up early Monday morning and attempt to
record the HamTV transmission as ISS passes over the US on its way to
the UK for the planned ARISS contact. Hopefully, if I can get a clean IQ
recording of the HamTV transmission, we can use the recording to begin
developing our GNU Radio DVB-S demodulators to extract the video stream.
Any and all info would be appreciated.
Thanks!
-Zach, KJ4QLP
--
Research Associate
Ted & Karyn Hume Center for National Security & Technology
Virginia Polytechnic Institute & State University
Work Phone: 540-231-4174
Cell Phone: 540-808-6305
------------------------------
Message: 3
Date: Sat, 7 May 2016 11:39:07 -0500
From: "JoAnne Maenpaa" <k9jkm@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Upcoming HamTV ???
Message-ID: <005901d1a87e$f99ce610$ecd6b230$@xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Zach
> In the same vein, does anyone know of a good webpage or other
> resource for determining the operating schedule of the HamTV
> transmitter or is the upcoming contacts page on the ARISS site
> the best place?
One resource that I monitor is the HamTV group on yahoogroups.com
https://ca.groups.yahoo.com/neo/groups/HamTV/info
Most of the recent discussion has been UK-centric since most of the HamTV
activations have been for their ARISS contacts.
--
73 de JoAnne K9JKM
k9jkm@xxxxx.xxx
------------------------------
Message: 4
Date: Sat, 7 May 2016 12:54:34 -0400
From: John Brier <johnbrier@xxxxx.xxx>
To: JoAnne Maenpaa <k9jkm@xxxxxxx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Upcoming HamTV ???
Message-ID:
<CALn0fKMciyP486FpXn5MRbakEa9pmn-dmN_zMNhKvU1yoY-kOA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Also, it's often on even when there are no contacts. It's just that
it's only sending a blank signal. See the reports here:
http://issfanclub.com/video-reports
73,
John KG4AKV
On Sat, May 7, 2016 at 12:39 PM, JoAnne Maenpaa <k9jkm@xxxxxxx.xxx> wrote:
> Hi Zach
>
>> In the same vein, does anyone know of a good webpage or other
>> resource for determining the operating schedule of the HamTV
>> transmitter or is the upcoming contacts page on the ARISS site
>> the best place?
>
> One resource that I monitor is the HamTV group on yahoogroups.com
> https://ca.groups.yahoo.com/neo/groups/HamTV/info
>
> Most of the recent discussion has been UK-centric since most of the HamTV
> activations have been for their ARISS contacts.
>
> --
> 73 de JoAnne K9JKM
> k9jkm@xxxxx.xxx
>
>
> _______________________________________________
> 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: 5
Date: Sat, 7 May 2016 17:02:29 +0000 (UTC)
From: Fer <mhz4464@xxxxx.xxx>
To: Zach Leffke <zleffke@xx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Upcoming HamTV ???
Message-ID:
<1368673425.274889.1462640549909.JavaMail.yahoo@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Hi Zach KJ4QLP
I am probably the less qualified person to answer your questions so I'll be
short:
1) HamTv during last month and now is ?ALWAYS ON ?at 2395 MHz with blank
signal apart during some ARISS contact like next monday when you can see
live transmision.
2) more info here ?HAM Video
|
|
|
| | |
|
|
|
| |
HAM Video
By Super User | |
|
|
3) I normaly receive HamTv from ISS with 1.2m prime focus dish, your 3m dish
will give you a better signal when ISS is low but you need a real precise
and fast tracking system?4) I have an ISS ?HamTv ?I/Q file and if you need
it, just shout
73 Fer IW1DTU
On Saturday, May 7, 2016 4:14 PM, Zach Leffke <zleffke@xx.xxx> wrote:
Hello Everyone,
I noticed that the Monday, 20160509, 0926 UTC planned ARISS contact with
The Kings School in the UK says to watch for the HamTV transmitter.?
Does anyone know any more details about the HamTV side of this?? More
specifically, it looks like just before the UK contact (descending pass)
there will be a good pass over the Eastern US (ascending pass).? What
are the chances that the HamTV transmitter will be active during the
pass over the US?? Do they turn the HamTV transmitter on early?? Also, I
know they have 4 downlink frequency options and two operating modes.?
Does anyone know which frequency and which mode will be selected on
Monday? In the same vein, does anyone know of a good webpage or other
resource for determining the operating schedule of the HamTV transmitter
or is the upcoming contacts page on the ARISS site the best place?
We recently got our 3.0m Dish and S-Band receiver systems installed in
the VTGS and I was hoping to get up early Monday morning and attempt to
record the HamTV transmission as ISS passes over the US on its way to
the UK for the planned ARISS contact. Hopefully, if I can get a clean IQ
recording of the HamTV transmission, we can use the recording to begin
developing our GNU Radio DVB-S demodulators to extract the video stream.
Any and all info would be appreciated.
Thanks!
-Zach, KJ4QLP
--
Research Associate
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@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: 6
Date: Sat, 7 May 2016 18:23:41 +0100
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
To: "Fer" <mhz4464@xxxxx.xxx>, "Zach Leffke" <zleffke@xx.xxx>,
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Upcoming HamTV ???
Message-ID: <D161AEBE6A744EBEAB0D366C81446F36@xxxxxxx.xxxxx>
Content-Type: text/plain; format=flowed; charset="UTF-8";
reply-type=original
Hi Zach,
Have a look at the english pages here...http://www.vivadatv.org/index.php
there is a specific page on the ARISS HamTV project.
The 3 metre dish sounds grand but you will need to have some special
decoding software to replace some missing data in the transport stream. The
details are given in the forum mentioned above.
If the camera is not connected - this only usually happens for perhaps 5
minutes before the scheduled contact then a blank DVB-S carrier is
transmitted usually 24/7. Success is when you see a black screen with a thin
blue vertical line down the left hand side of the image. Plus, if you turn
up the audio, you can hear a faint system hiss from the equipment on board.
The usual setup is Symbol rate 2.0 Ms/s FEC : ? on 2395MHz.
I have decoded the signal using a hand held 60cm dish on a near overhead
pass. With the 3.8 metre dish at Goonhilly we have been successful for
perhaps 8 mins of a 10 min pass. The various appendages (The Soyuz and other
visiting modules) do get in the way of the RF and/or cause reflections so
the signals can suffer from odd phase and polarisation changes during a
pass.
During the Kings School contact your should look at the
http://principia.ariss.org/Dashboard/ page as you can see the two dishes we
use for the contact and the signals levels that result.
Sadly this is going to be the last ARISS HmTV contact of thePrincipia
Mission
Good luck with the GNU radio implementation....I believe that there are a
few others working on this challenge in a similar way!
73
Graham
G3VZV
-----Original Message-----
From: Fer via AMSAT-BB
Sent: Saturday, May 07, 2016 6:02 PM
To: Zach Leffke ; amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Upcoming HamTV ???
Hi Zach KJ4QLP
I am probably the less qualified person to answer your questions so I'll be
short:
1) HamTv during last month and now is ALWAYS ON at 2395 MHz with blank
signal apart during some ARISS contact like next monday when you can see
live transmision.
2) more info here HAM Video
|
|
|
| | |
|
|
|
| |
HAM Video
By Super User | |
|
|
3) I normaly receive HamTv from ISS with 1.2m prime focus dish, your 3m dish
will give you a better signal when ISS is low but you need a real precise
and fast tracking system 4) I have an ISS HamTv I/Q file and if you need
it, just shout
73 Fer IW1DTU
On Saturday, May 7, 2016 4:14 PM, Zach Leffke <zleffke@xx.xxx> wrote:
Hello Everyone,
I noticed that the Monday, 20160509, 0926 UTC planned ARISS contact with
The Kings School in the UK says to watch for the HamTV transmitter.
Does anyone know any more details about the HamTV side of this? More
specifically, it looks like just before the UK contact (descending pass)
there will be a good pass over the Eastern US (ascending pass). What
are the chances that the HamTV transmitter will be active during the
pass over the US? Do they turn the HamTV transmitter on early? Also, I
know they have 4 downlink frequency options and two operating modes.
Does anyone know which frequency and which mode will be selected on
Monday? In the same vein, does anyone know of a good webpage or other
resource for determining the operating schedule of the HamTV transmitter
or is the upcoming contacts page on the ARISS site the best place?
We recently got our 3.0m Dish and S-Band receiver systems installed in
the VTGS and I was hoping to get up early Monday morning and attempt to
record the HamTV transmission as ISS passes over the US on its way to
the UK for the planned ARISS contact. Hopefully, if I can get a clean IQ
recording of the HamTV transmission, we can use the recording to begin
developing our GNU Radio DVB-S demodulators to extract the video stream.
Any and all info would be appreciated.
Thanks!
-Zach, KJ4QLP
--
Research Associate
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@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
_______________________________________________
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: Sat, 7 May 2016 18:47:03 +0100
From: Daniel Cussen <dan@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Upcoming HamTV ???
Message-ID:
<CAF3DnKjs5WSPRMz=kpZLvKhPSaZxPRuePAYxWcCodvjg7hLm_Q@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
> What are the chances that the HamTV transmitter will be active during the
> pass over the US? Do they turn the HamTV transmitter on early?
Yes they do. The camera is often connected and downlinking before and
after school contacts. It was on over Australia one time at least.
> Does anyone know which frequency and which mode will be selected on
> Monday?
2395Mhz Symbol Rate 2000. DVB-S QPSK. Note there is only one
recommended receiver. Other DVB-S receivers may or may not work. The
ideal way to test is to generate the EXACT same signal as the ISS (If
you can). There is also sample TS files online to test equipment, to
see if it works in the real world. 99% of the time there is no video,
but normally QPSK downlinking
> In the same vein, does anyone know of a good webpage or other
> resource for determining the operating schedule of the HamTV transmitter
> or is the upcoming contacts page on the ARISS site the best place?
There is the email list specific for HAMTV. In general live video is
currently only used for European direct or telebridge contacts as
Europe is the only place with a HAMTV ground network. There is plans
for similar networks in Australia and the USA. It has been picked up
in Japan too.
Nearly EVERY pass there is what we call "blank transmission" which is
the transmitter outputting QPSK modulated transport stream with the
stations name and video. However as the camera is not normally
connected, you receive black video, with a blue bar on the left side.
We would like a proper test card, but this is not possible at present.
However these blank transmissions are very useful for testing
tracking, and alignment. The recommended setup can log the signal
strength every 1 second, giving a very good idea of the performance of
the system.
> We recently got our 3.0m Dish and S-Band receiver systems installed in
> the VTGS and I was hoping to get up early Monday morning and attempt to
> record the HamTV transmission as ISS passes over the US on its way to
> the UK for the planned ARISS contact.
You can start now to attempt to receive the QPSK transmission. I
assume it is on, at least it was 2 days ago.
> Hopefully, if I can get a clean IQ
> recording of the HamTV transmission, we can use the recording to begin
> developing our GNU Radio DVB-S demodulators to extract the video stream.
There is a recommended set up, which is designed for decoding and
recording etc. If not using a recommended setup then it may be hard to
test that it will actually work when live video suddenly appears. For
example some receivers cannot do low symbol rates or are bad at doing
it. Other receivers need the channel "saved" before they will display
it. There is also a problem with the downlink format. While it is
"standard" DVB-S format, there is some non standard components in the
transports stream. This can cause receivers that work fine with DVB-S
to not display the video. The problem is missing tables which the
recommended software fixes automatically:
See here:
http://www.vivadatv.org/viewtopic.php?f=66&t=281
The best way to confirm your setup will work is to recreate the exact
same signal as from space and decode that.
In terms of tracking the ISS. Most European ground stations are using
modest 4ft dishes which have a wide beam width and make tracking less
critical. Larger dishes make tracking much harder especially at high
elevations where the ISS appears to move faster.
I would recommend
1) Use TLE files directly from space track (not from AMSAT) updated daily
2) Calibrate the dish using sun tracking or sun radio noise tracking
and confirm it is accurate.
3) If you have problems consider using the recommended hardware (DVB-S
receiver) and possibly a smaller dish. We also have special Wifi
blocking filters available.
Lastly we are looking for US ground stations to offer to receive HAMTV
for USA contacts. If you feel you could do this, then we can provide
more help with recommended hardware and support to help decode and
stream the live video. Ideally we would like a chain of stations
across the US for at least 10 minutes of constant overlapping video.
Dan EI9FHB
HAMTV Ground station in Ireland
------------------------------
Message: 8
Date: Sat, 7 May 2016 19:43:56 +0100
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
To: <dan@xxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Upcoming HamTV ???
Message-ID: <D03437829308452497CF476C8F1278AC@xxxxxxx.xxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I also forgot that this page now includes ISS-DATV
http://www.amsat.org/status/index.php where we can all log reception reports
73
Graham
G3VZV
-----Original Message-----
From: Daniel Cussen
Sent: Saturday, May 07, 2016 6:47 PM
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Upcoming HamTV ???
> What are the chances that the HamTV transmitter will be active during the
> pass over the US? Do they turn the HamTV transmitter on early?
Yes they do. The camera is often connected and downlinking before and
after school contacts. It was on over Australia one time at least.
> Does anyone know which frequency and which mode will be selected on
> Monday?
2395Mhz Symbol Rate 2000. DVB-S QPSK. Note there is only one
recommended receiver. Other DVB-S receivers may or may not work. The
ideal way to test is to generate the EXACT same signal as the ISS (If
you can). There is also sample TS files online to test equipment, to
see if it works in the real world. 99% of the time there is no video,
but normally QPSK downlinking
> In the same vein, does anyone know of a good webpage or other
> resource for determining the operating schedule of the HamTV transmitter
> or is the upcoming contacts page on the ARISS site the best place?
There is the email list specific for HAMTV. In general live video is
currently only used for European direct or telebridge contacts as
Europe is the only place with a HAMTV ground network. There is plans
for similar networks in Australia and the USA. It has been picked up
in Japan too.
Nearly EVERY pass there is what we call "blank transmission" which is
the transmitter outputting QPSK modulated transport stream with the
stations name and video. However as the camera is not normally
connected, you receive black video, with a blue bar on the left side.
We would like a proper test card, but this is not possible at present.
However these blank transmissions are very useful for testing
tracking, and alignment. The recommended setup can log the signal
strength every 1 second, giving a very good idea of the performance of
the system.
> We recently got our 3.0m Dish and S-Band receiver systems installed in
> the VTGS and I was hoping to get up early Monday morning and attempt to
> record the HamTV transmission as ISS passes over the US on its way to
> the UK for the planned ARISS contact.
You can start now to attempt to receive the QPSK transmission. I
assume it is on, at least it was 2 days ago.
> Hopefully, if I can get a clean IQ
> recording of the HamTV transmission, we can use the recording to begin
> developing our GNU Radio DVB-S demodulators to extract the video stream.
There is a recommended set up, which is designed for decoding and
recording etc. If not using a recommended setup then it may be hard to
test that it will actually work when live video suddenly appears. For
example some receivers cannot do low symbol rates or are bad at doing
it. Other receivers need the channel "saved" before they will display
it. There is also a problem with the downlink format. While it is
"standard" DVB-S format, there is some non standard components in the
transports stream. This can cause receivers that work fine with DVB-S
to not display the video. The problem is missing tables which the
recommended software fixes automatically:
See here:
http://www.vivadatv.org/viewtopic.php?f=66&t=281
The best way to confirm your setup will work is to recreate the exact
same signal as from space and decode that.
In terms of tracking the ISS. Most European ground stations are using
modest 4ft dishes which have a wide beam width and make tracking less
critical. Larger dishes make tracking much harder especially at high
elevations where the ISS appears to move faster.
I would recommend
1) Use TLE files directly from space track (not from AMSAT) updated daily
2) Calibrate the dish using sun tracking or sun radio noise tracking
and confirm it is accurate.
3) If you have problems consider using the recommended hardware (DVB-S
receiver) and possibly a smaller dish. We also have special Wifi
blocking filters available.
Lastly we are looking for US ground stations to offer to receive HAMTV
for USA contacts. If you feel you could do this, then we can provide
more help with recommended hardware and support to help decode and
stream the live video. Ideally we would like a chain of stations
across the US for at least 10 minutes of constant overlapping video.
Dan EI9FHB
HAMTV Ground station in Ireland
_______________________________________________
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expressed
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Message: 9
Date: Sat, 7 May 2016 13:53:54 -0400
From: Bruce MacAlister <w4bruradio@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Cc: "Dave Taylor, w8aas" <w8aas@xxxxxxx.xxx>
Subject: [amsat-bb] Does Sat32PC work with an Icom 7100?
Message-ID:
<CAOtCuNvUjjvWXW0BxjYQ3T=QAk7CKDLEa6NoX2m43kY9uMFtpg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I need advice. I am trying to get an Icom 7100 connected to Sat32PC.
I successfully connect to the IC-7100 with N1MM and Ham Radio Deluxe. Both
apps can tune the 7100 and any frequency, mode, etc entered in the 7100 is
shown on the N1MM and HRD screens.
Sat32PC seems not to connect.
My connection is Win 7, a real serial port as COM1, an Icom CT-17 interface
box with cable to the Remote jack on the IC-7100 transceiver body.
Thinking it might be Windows 7 I tried an old Windows XP machine and got
the same failure. N1MM also worked on that XP machine so I know it's not
the physical connections.
I've been at this for days with no result.
73, Peace,???? ,???????, ??????, Bruce ?
------------------------------
Message: 10
Date: Sat, 7 May 2016 14:47:27 -0500
From: "George Henry" <ka3hsw@xxx.xxx>
To: <w4bru@xxxx.xxx>, <amsat-bb@xxxxx.xxx>
Cc: "Dave Taylor, w8aas" <w8aas@xxxxxxx.xxx>
Subject: Re: [amsat-bb] Does Sat32PC work with an Icom 7100?
Message-ID: <F0493008619949F69A10DB8C45F75EC6@xxxxxxx>
Content-Type: text/plain; format=flowed; charset="UTF-8";
reply-type=original
Is there a jack labled CI-V? If so, the CT-17 should be connected to that.
Not sure what the Remote jack might be for, but every other Icom radio I
have ever seen had a CI-V jack...
George, KA3HSW
----- Original Message -----
From: "Bruce MacAlister" <w4bruradio@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Cc: "Dave Taylor, w8aas" <w8aas@xxxxxxx.xxx>
Sent: Saturday, May 07, 2016 12:53 PM
Subject: [amsat-bb] Does Sat32PC work with an Icom 7100?
>I need advice. I am trying to get an Icom 7100 connected to Sat32PC.
>
> I successfully connect to the IC-7100 with N1MM and Ham Radio Deluxe.
> Both
> apps can tune the 7100 and any frequency, mode, etc entered in the 7100 is
> shown on the N1MM and HRD screens.
>
> Sat32PC seems not to connect.
>
> My connection is Win 7, a real serial port as COM1, an Icom CT-17
> interface
> box with cable to the Remote jack on the IC-7100 transceiver body.
>
> Thinking it might be Windows 7 I tried an old Windows XP machine and got
> the same failure. N1MM also worked on that XP machine so I know it's not
> the physical connections.
>
> I've been at this for days with no result.
>
> 73, Peace,???? ,???????, ??????, Bruce ?
> _______________________________________________
> 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
>
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_______________________________________________
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 11, Issue 143
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