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CX2SA > SATDIG 12.07.16 19:25l 819 Lines 30406 Bytes #999 (0) @ WW
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Sent: 160712/1707Z @:CX2SA.SAL.URY.SOAM #:48511 [Salto] FBB7.00e $:AMSATBB11230
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. unknown amp (Bob- W7LRD)
2. Re: LilacSat-2 Transponder active over N America 13:15 UTC
(Clayton Coleman)
3. Re: LilacSat-2 Transponder active over N America 13:15 UTC
(Rolf Krogstad)
4. unknown amp (Bob- W7LRD)
5. Upcoming ARISS Contact Schedule as of 2016-07-12 00:00 UTC
(AJ9N@xxx.xxxx
6. Re: LilacSat-2 Transponder active over N America 13:15 UTC
(Rick Tejera)
7. Re: Yaesu G-5500 Rotor Control (Edward R Cole)
8. Re: Yaesu G-5500 Rotor Control (Bill Booth)
9. Re: LilacSat-2 Transponder active over N America 13:15 UTC
(KO6TZ Bob)
10. Re: LilacSat-2 Transponder active over N America 13:15 UTC
(Paul Stoetzer)
11. Attention A07 MODE A/B 2M1EUB/P I087NC (paul robinson)
12. Re: LilacSat-2 Transponder active over N America 13:15 UTC
(Paul Stoetzer)
----------------------------------------------------------------------
Message: 1
Date: Mon, 11 Jul 2016 18:54:31 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] unknown amp
Message-ID:
<1472838038.36263815.1468263271245.JavaMail.zimbra@xxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
I have a couple of these, tower mounted amplifiers. The label on the amp
says," Ericsson TMA DDFX 1850-1880mhz". It is about a foot long and six
inches on the sides, weighs about 12 Lbs. Does this have any use for our
efforts? If you want any pictures of the innards just ask.
73
Bob W7LRD
Seattle, Wa.
------------------------------
Message: 2
Date: Mon, 11 Jul 2016 15:15:22 -0500
From: Clayton Coleman <kayakfishtx@xxxxx.xxx>
To: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] LilacSat-2 Transponder active over N America
13:15 UTC
Message-ID:
<CAPovOwerwXcX5n7e0a6r2nHz3yN3=7M_JZ5YGp3E_gsbQ4rd2w@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I should have been a little more clear in my email earlier. The
transponder on LilacSat-2 active today was not the normal FM one but
rather a SSB transponder. It is experimental and has no AGC according
to the reports from Twitter. I'd suggest paying attention to the
AMSAT OSCAR status page (http://www.amsat.org/status) and following
BG2BHC on Twitter for operational updates.
I was using manual control but you can add this line to your
DOPPLER.SQF. It will need some minor calibration:
LILACSAT-2,437200.0,144362.0,USB,USB,NOR,0,0,SSB Transponder
73
Clayton
W5PFG
On Mon, Jul 11, 2016 at 9:26 AM, Clayton Coleman <kayakfishtx@xxxxx.xxx>
wrote:
> This morning, Glenn AA5PK, and I had a QSO via the experimental
> transponder activated on LilacSat-2. It was very interesting and fun.
> A non-inverting mode J transponder was new to me.
>
> Using manual tuning to adjust for Doppler shift proved to be a small
> challenge as I am more accustomed to operating on a transponder like
> FO-29. Running SDR in parallel to my Icom IC-9100 gave me a good
> visual representation of the transponder pass band.
>
> You can listen to a brief clip of our QSO here:
>
> https://soundcloud.com/w5pfg/lilacsat-2-2016-07-11-1315z-ssb-transponder
>
> 73
> Clayton
> W5PFG
------------------------------
Message: 3
Date: Mon, 11 Jul 2016 15:16:04 -0500
From: Rolf Krogstad <rolf.krogstad@xxxxx.xxx>
To: Clayton Coleman <kayakfishtx@xxxxx.xxx>
Cc: "<AMSAT-BB@xxxxx.xxx>" <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] LilacSat-2 Transponder active over N America
13:15 UTC
Message-ID:
<CAJJyj=Y+iNqagynpi8UMn8bDSPqutqMbZo61ZUOSHLYM6ky7ew@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I was on LilacSat-2 yesterday around 23.30z. My signal was strong on the
downlink but there was no one else on that pass. Worth checking it out!
Rolf. NR0T
On Jul 11, 2016 2:30 PM, "Clayton Coleman" <kayakfishtx@xxxxx.xxx> wrote:
This morning, Glenn AA5PK, and I had a QSO via the experimental
transponder activated on LilacSat-2. It was very interesting and fun.
A non-inverting mode J transponder was new to me.
Using manual tuning to adjust for Doppler shift proved to be a small
challenge as I am more accustomed to operating on a transponder like
FO-29. Running SDR in parallel to my Icom IC-9100 gave me a good
visual representation of the transponder pass band.
You can listen to a brief clip of our QSO here:
https://soundcloud.com/w5pfg/lilacsat-2-2016-07-11-1315z-ssb-transponder
73
Clayton
W5PFG
_______________________________________________
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: Mon, 11 Jul 2016 20:52:58 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] unknown amp
Message-ID:
<567135474.36343831.1468270378714.JavaMail.zimbra@xxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
I have a couple of these, tower mounted amplifiers. The label on the amp
says," Ericsson TMA DDFX 1850-1880mhz". It is about a foot long and six
inches on the sides, weighs about 12 Lbs. Does this have any use for our
efforts? If you want any pictures of the innards just ask.
73
Bob W7LRD
Seattle, Wa.
------------------------------
Message: 5
Date: Mon, 11 Jul 2016 20:18:50 -0400
From: AJ9N@xxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Upcoming ARISS Contact Schedule as of 2016-07-12
00:00 UTC
Message-ID: <11d5b1.47beedeb.44b5916a@xxx.xxx>
Content-Type: text/plain; charset="UTF-8"
Upcoming ARISS Contact Schedule as of 2016-07-12 00:00 UTC
Quick list of scheduled contacts and events:
ISS R&D Conference, San Diego, CA, telebridge via W6SRJ
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Jeff Williams KD5TVQ
Contact is go for: Thu 2016-07-14 16:03:33 UTC 37 deg
Frontiers of Flight Museum's ?Moon Day 2016?, Dallas TX, telebridge via
W6SRJ
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Jeff Williams KD5TVQ
Contact is go for: Sat 2016-07-16 15:54:09 UTC 88 deg
YOTA Camp 2016 IARU-R1, Salzburg, Austria, telebridge via VK4KHZ (***)
The ISS callsign is presently scheduled to be NA1SS (***)
The scheduled astronaut is Jeff Williams KD5TVQ (***)
Contact is a go for: Mon 2016-07-18 10:25:53 UTC 72 deg (***)
United Space School hosted by the Foundation for International Space
Education (FISE), Seabrook TX, telebridge via W6SRJ (***)
The ISS callsign is presently scheduled to be NA1SS (***)
The scheduled astronaut is Jeff Williams KD5TVQ (***)
Contact is a go for: Tue 2016-07-19 14:52:20 UTC 74 deg (***)
Ufa, Russia, direct via TBD
The ISS callsign is presently scheduled to be RS?ISS
The scheduled astronaut is Oleg Skripochka RN3FU
Contact is a go for Thu 2016-07-23 18:50 UTC
Exp. 48 on orbit
Anatoly Ivanishin
Kate Rubins KG5FYJ
Takuya Onishi KF5LKS
Welcome aboard!
****************************************************************************
**
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@xxxxx.xxx or aj9n@xxx.xxx.
*****************************************************
**************************
All ARISS contacts are made via the Ericsson 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@xxxxxxxxx.xxx
****************************************************************************
ARISS congratulations the following mentors who have now mentored over 100
schools:
Gaston ON4WF with 121
Satoshi 7M3TJZ with 119
Francesco IK?WGF with 116
****************************************************************************
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 2016-07-12 00:00 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
Total number of ARISS ISS to earth school events is 1067.
Each school counts as 1 event.
Total number of ARISS ISS to earth school contacts is 1032.
Each contact may have multiple schools sharing the same time slot.
Total number of ARISS supported terrestrial contacts is 47.
A complete year by year breakdown of the contacts may be found in the
file.
http://www.amsat.org/amsat/ariss/news/arissnews.rtf
Please feel free to contact me if more detailed statistics are needed.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The following US states and entities have never had an ARISS contact:
Arkansas, Delaware, South Dakota, Wyoming, American Samoa, Guam, Northern
Marianas Islands, and the Virgin Islands.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
QSL information may be found at:
http://www.ariss.org/qsl-cards.html
ISS callsigns: DP?ISS, IR?ISS, NA1SS, OR4ISS, RS?ISS
****************************************************************************
The successful school list has been updated as of 2016-07-08 05:00 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. 47 on orbit
Jeff Williams KD5TVQ
Oleg Skripochka RN3FU
Aleksey Ovchinin
Exp. 48 on orbit
Anatoly Ivanishin
Kate Rubins KG5FYJ
Takuya Onishi KF5LKS
****************************************************************************
73,
Charlie Sufana AJ9N
One of the ARISS operation team mentors
------------------------------
Message: 6
Date: Mon, 11 Jul 2016 17:32:38 -0700
From: "Rick Tejera" <saguaroastro@xxx.xxx>
To: "'Clayton Coleman'" <kayakfishtx@xxxxx.xxx>, "'AMSAT-BB'"
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] LilacSat-2 Transponder active over N America
13:15 UTC
Message-ID: <02a901d1dbd4$e4b2d550$ae187ff0$@xxx>
Content-Type: text/plain; charset="us-ascii"
Clayton,
I thought i saw on a link ona tweet from BG2BHC shows the uplink to be
144362.5? not that it would matter much, but i do tend to be a tad anal that
way hi hi.
Rick Tejera (K7TEJ)
Saguaro Astronomy Club
www.saguaroastro.org
Thunderbird Radio Club
www.w7tbc.org
623-572-0713
623-203-4121 (cell)
SaguaroAstro@xxx.xxx
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Clayton
Coleman
Sent: Monday, July 11, 2016 1:15 PM
To: AMSAT-BB
Subject: Re: [amsat-bb] LilacSat-2 Transponder active over N America 13:15
UTC
I should have been a little more clear in my email earlier. The
transponder on LilacSat-2 active today was not the normal FM one but
rather a SSB transponder. It is experimental and has no AGC according
to the reports from Twitter. I'd suggest paying attention to the
AMSAT OSCAR status page (http://www.amsat.org/status) and following
BG2BHC on Twitter for operational updates.
I was using manual control but you can add this line to your
DOPPLER.SQF. It will need some minor calibration:
LILACSAT-2,437200.0,144362.0,USB,USB,NOR,0,0,SSB Transponder
73
Clayton
W5PFG
On Mon, Jul 11, 2016 at 9:26 AM, Clayton Coleman <kayakfishtx@xxxxx.xxx>
wrote:
> This morning, Glenn AA5PK, and I had a QSO via the experimental
> transponder activated on LilacSat-2. It was very interesting and fun.
> A non-inverting mode J transponder was new to me.
>
> Using manual tuning to adjust for Doppler shift proved to be a small
> challenge as I am more accustomed to operating on a transponder like
> FO-29. Running SDR in parallel to my Icom IC-9100 gave me a good
> visual representation of the transponder pass band.
>
> You can listen to a brief clip of our QSO here:
>
> https://soundcloud.com/w5pfg/lilacsat-2-2016-07-11-1315z-ssb-transponder
>
> 73
> Clayton
> W5PFG
_______________________________________________
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: Tue, 12 Jul 2016 00:37:36 -0800
From: Edward R Cole <kl7uw@xxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Yaesu G-5500 Rotor Control
Message-ID: <201607120837.u6C8bbOY014689@xxxxxxxxx.xxxxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Although I have an old Unitrack-2000 radio/rotor interface, I decided
to go KISS and bought a LVB Tracker from Amsat; arrived on
Saturday. Time is sometimes more important than money.
The LVB tracker just plugs into my B5400 and connects to my computer
via a USB/RS-232 conversion cable. Sits very nicely on top of my
B5400 control box. Its plug-n-play with SatPC32.
I may "dink" with the Unitrack someday as it does connect for
auto-tuning the radio, but it requires a parallel port for connecting
to the computer (not many of them still running). I've only had the
unitrack for 16-years sitting in a drawer.
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubususa@xxxxx.xxx
------------------------------
Message: 8
Date: Tue, 12 Jul 2016 07:48:18 -0400
From: Bill Booth <ve3nxk@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Yaesu G-5500 Rotor Control
Message-ID: <5784D902.9030009@xxxxx.xxx>
Content-Type: text/plain; charset=windows-1252; format=flowed
On 2016-07-12 4:37 AM, Edward R Cole wrote:
> The LVB tracker just plugs into my B5400 and connects to my computer via a
> USB/RS-232 conversion cable. Sits very nicely on top of my B5400 control
box.
> Its plug-n-play with SatPC32.
Well I wish my experience was better. First problem was I thought the
interface
was USB as the AMSAT wording indicated, but only if you purchased a USB/serial
cable.....so it is still really serial.
I wanted it to work with NOVA as I have done for years with another parallel
unit.
And while it does work kinda, I had to shelve the device and go back to the
parallel unit. I found the unit not to be linear over the entire compass
range.
Readings in the NOVA program were way off. Stupid part is that when you did
it
manually the unit shows the right stuff.
In discussions with others and the list, the standard comment was use SATPC32
software. I just did not have the time yet to learn another bit of
software...W10
was enough for this year.
--
Bill Booth VE3NXK
Sundridge ON, Canada
79.23.37 W x 45.46.18 N
FN05ns
Visit my weather WebCam at http://www.almaguin.com/wxcurrent/weather.html
Organ and Tissue Donation - The Gift of Life
Talk to your family. Your decision can make a difference.
------------------------------
Message: 9
Date: Tue, 12 Jul 2016 06:18:14 -0700
From: KO6TZ Bob <my.callsign@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] LilacSat-2 Transponder active over N America
13:15 UTC
Message-ID: <37a3805b-ef1f-0c1d-df38-06381454560b@xxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8; format=flowed
Clayton,
Thanks for the "Heads-Up" worked perfect. A couple of taps on the "-"
key and SatPC32 tracked the satellite perfect. Had a QSO with Glenn.
Nice sounding transponder.
KO6TZ
Bob
I should have been a little more clear in my email earlier. The
transponder on LilacSat-2 active today was not the normal FM one but
rather a SSB transponder. It is experimental and has no AGC according
to the reports from Twitter. I'd suggest paying attention to the
AMSAT OSCAR status page (http://www.amsat.org/status) and following
BG2BHC on Twitter for operational updates.
I was using manual control but you can add this line to your
DOPPLER.SQF. It will need some minor calibration:
LILACSAT-2,437200.0,144362.0,USB,USB,NOR,0,0,SSB Transponder
73
Clayton
W5PFG
On Mon, Jul 11, 2016 at 9:26 AM, Clayton Coleman <kayakfishtx at
gmail.com> wrote:
> This morning, Glenn AA5PK, and I had a QSO via the experimental
> transponder activated on LilacSat-2. It was very interesting and fun.
> A non-inverting mode J transponder was new to me.
>
> Using manual tuning to adjust for Doppler shift proved to be a small
> challenge as I am more accustomed to operating on a transponder like
> FO-29. Running SDR in parallel to my Icom IC-9100 gave me a good
> visual representation of the transponder pass band.
>
> You can listen to a brief clip of our QSO here:
>
------------------------------
Message: 10
Date: Tue, 12 Jul 2016 09:36:42 -0400
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: KO6TZ Bob <my.callsign@xxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] LilacSat-2 Transponder active over N America
13:15 UTC
Message-ID:
<CABzOSOo3deKU6PEzNVRJqkD3BrE9LT-0E=HZbjMRWg7QKzmy6Q@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I hope to be able to catch it at some point. I was on the 09:51 UTC
pass over the Atlantic, but only heard the familiar telemetry bursts
of the satellite in it's default mode.
Keep in mind that this transponder is entirely done in software - the
second software defined linear transponder to fly after the ARISSat-1
transponder. Being non-inverting adds a bit of a challenge for manual
operators, but nothing that can't be handled.
LilacSat-2 is a neat satellite. When turned on it's been in FM
transponder mode most often, but the on-board SDR also has programming
for an APRS digipeater as well as a linear transponder as we've seen
the past couple of days. Unfortunately, it suffers from periodic
resets and resets to a telemetry only mode, so you never really know
whether or not it will be on when it comes over.
73,
Paul, N8HM
On Tue, Jul 12, 2016 at 9:18 AM, KO6TZ Bob <my.callsign@xxxxxxx.xxx> wrote:
> Clayton,
>
> Thanks for the "Heads-Up" worked perfect. A couple of taps on the "-" key
> and SatPC32 tracked the satellite perfect. Had a QSO with Glenn. Nice
> sounding transponder.
>
> KO6TZ
> Bob
>
>
> I should have been a little more clear in my email earlier. The
> transponder on LilacSat-2 active today was not the normal FM one but
> rather a SSB transponder. It is experimental and has no AGC according
> to the reports from Twitter. I'd suggest paying attention to the
> AMSAT OSCAR status page (http://www.amsat.org/status) and following
> BG2BHC on Twitter for operational updates.
>
> I was using manual control but you can add this line to your
> DOPPLER.SQF. It will need some minor calibration:
>
> LILACSAT-2,437200.0,144362.0,USB,USB,NOR,0,0,SSB Transponder
>
> 73
> Clayton
> W5PFG
>
> On Mon, Jul 11, 2016 at 9:26 AM, Clayton Coleman <kayakfishtx at gmail.com>
> wrote:
>> This morning, Glenn AA5PK, and I had a QSO via the experimental
>> transponder activated on LilacSat-2. It was very interesting and fun.
>> A non-inverting mode J transponder was new to me.
>>
>> Using manual tuning to adjust for Doppler shift proved to be a small
>> challenge as I am more accustomed to operating on a transponder like
>> FO-29. Running SDR in parallel to my Icom IC-9100 gave me a good
>> visual representation of the transponder pass band.
>>
>> You can listen to a brief clip of our QSO here:
>>
>
> _______________________________________________
> 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: 11
Date: Tue, 12 Jul 2016 16:33:45 +0000 (UTC)
From: paul robinson <pushbiker2004@xxxxx.xx.xx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Attention A07 MODE A/B 2M1EUB/P I087NC
Message-ID:
<1062924973.2947189.1468341225821.JavaMail.yahoo@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
2M1EUB AO7 MODE A/B QRV THIS WEEK.From new qth in Aberdeenshire Scotland.73
de paul
------------------------------
Message: 12
Date: Tue, 12 Jul 2016 13:05:28 -0400
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: KO6TZ Bob <my.callsign@xxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] LilacSat-2 Transponder active over N America
13:15 UTC
Message-ID:
<CABzOSOr_BAFVemzPzyoDGyYJd3gGGu0jPQ91DavK43edC-G8+A@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I understand there have been some questions about how inverting vs.
non-inverting transponders and why it makes a difference with the
Doppler shift.
At AOS, the satellite is moving towards you. A 435 MHz downlink signal
for a LEO satellite is going to appear to be about 10 kHz higher than
the frequency at which the satellite is transmitting (this does vary
based on orbital altitude, and thus velocity). At the same time, your
145 MHz uplink signal is going to appear at the satellite to be about
3.5 kHz higher than the frequency at which you're transmitting.
Let's look at an example for FO-29, an inverting mode V/U (J) linear
transponder satellite, based on these estimated numbers:
The convention for manual tuning for Doppler on amateur satellites is
to tune the highest of the tune frequencies and leave the other one
alone as much as possible, so someone calling CQ will generally leave
their transmit fixed and tune only their downlink on a mode V/U linear
transponder satellite. If you uplink at 145.925 MHz at your AOS, your
signal will appear to be about 145.928.5 MHz at the satellite, since
the transponder is inverting (uplinks from 145.900 MHz - 146.000 MHz
corresponding to downlinks from 435.900 MHz - 435.800 Mhz), FO-29's
transponder will retransmit your signal at 435.871.5 MHz. So at your
AOS, you will receive your signal at about 435.881.5 MHz. At your LOS,
with the satellite moving away from you, the satellite's downlink
frequency will appear to be about 10 kHz lower and your uplink
frequency will appear to be about 3.5 kHz lower at the satellite.
FO-29 will be receiving your uplink signal at 145.921.5 MHz and will
retransmit that at 435.878.5 MHz, which will appear to be 435.868.5
MHz at your LOS. The total Doppler shift encountered by the user is
thus 13 kHz. You'll note that this is the difference between the total
shift on the downlink (20 kHz) and the total shift on the uplink (7
kHz).
When the frequencies are inverted, the sidebands of a SSB signal are
naturally inverted as well. The convention is to always receive on
USB. Users therefore transmit on LSB.
Now, let's try this example on LilacSat-2's non-inverting mode V/U
linear transponder. The uplink frequencies for the transponder are
144.342.5 MHz - 144.382.5 MHz and the downlink frequencies are 437.180
MHz - 437.220 MHz. If you uplink in the center of the passband, at
144.362.5 MHz, at AOS your signal will appear to be approximately
144.366 MHz at the satellite. LilacSat-2, with it's passband
non-inverted, will retransmit this signal at 437.203.5 MHz, and you
will receive your signal on the ground at 437.213.5 MHz. At your LOS,
your signal will appear to be approximately 144.359 MHz at the
satellite and it will retransmit this signal at 437.196.5 MHz, which
you will receive on the ground at 437.186.5 MHz. The total Doppler
shift encountered by the user is thus 27 kHz. You'll note that this is
the SUM of the total shift on the downlink (20 kHz) and the total
shift on the uplink (7 kHz).
Of course, when using a non-inverted transponder, the sidebands will
not be inverted, so you'll naturally transmit in USB to receive your
signal on USB as well.
By inverting the frequencies on the downlink, more than half of the
total Doppler shift is canceled out, making manual tuning much easier!
Mode A (V/A), K (H/A), and T (H/V) transponders have traditionally
been non-inverting due to the low total Doppler shift at those
frequencies, but those using higher frequencies have used inverted
passbands since the first one was flown on AO-7. The P4A analog
transponder on Es'HailSat-2 will be an exception, being non-inverting
despite the use of 2.4 GHz and 10 GHz, but that's because the
satellite will be nearly stationary relative to the ground users and
the total Doppler shift will be very minimal. I do not know why
LilacSat-2's SDR linear transponder was programmed to be
non-inverting, but based on the comments made on Twitter by a member
of the Harbin University team, it was added purely as an experiment
(after all, when you're using an SDR, different modes are just lines
of code, no new hardware is needed). The transponder also lacks
automatic gain control, which is critical for maintaining the
linearity of downlink signals on a linear transponder. Strong signals
on the transponder may cause distortion of downlink signals. As
always, it's important to keep your ERP at a reasonable level.
73,
Paul, N8HM
On Tue, Jul 12, 2016 at 9:36 AM, Paul Stoetzer <n8hm@xxxx.xxx> wrote:
> I hope to be able to catch it at some point. I was on the 09:51 UTC
> pass over the Atlantic, but only heard the familiar telemetry bursts
> of the satellite in it's default mode.
>
> Keep in mind that this transponder is entirely done in software - the
> second software defined linear transponder to fly after the ARISSat-1
> transponder. Being non-inverting adds a bit of a challenge for manual
> operators, but nothing that can't be handled.
>
> LilacSat-2 is a neat satellite. When turned on it's been in FM
> transponder mode most often, but the on-board SDR also has programming
> for an APRS digipeater as well as a linear transponder as we've seen
> the past couple of days. Unfortunately, it suffers from periodic
> resets and resets to a telemetry only mode, so you never really know
> whether or not it will be on when it comes over.
>
> 73,
>
> Paul, N8HM
>
> On Tue, Jul 12, 2016 at 9:18 AM, KO6TZ Bob <my.callsign@xxxxxxx.xxx> wrote:
>> Clayton,
>>
>> Thanks for the "Heads-Up" worked perfect. A couple of taps on the "-" key
>> and SatPC32 tracked the satellite perfect. Had a QSO with Glenn. Nice
>> sounding transponder.
>>
>> KO6TZ
>> Bob
>>
>>
>> I should have been a little more clear in my email earlier. The
>> transponder on LilacSat-2 active today was not the normal FM one but
>> rather a SSB transponder. It is experimental and has no AGC according
>> to the reports from Twitter. I'd suggest paying attention to the
>> AMSAT OSCAR status page (http://www.amsat.org/status) and following
>> BG2BHC on Twitter for operational updates.
>>
>> I was using manual control but you can add this line to your
>> DOPPLER.SQF. It will need some minor calibration:
>>
>> LILACSAT-2,437200.0,144362.0,USB,USB,NOR,0,0,SSB Transponder
>>
>> 73
>> Clayton
>> W5PFG
>>
>> On Mon, Jul 11, 2016 at 9:26 AM, Clayton Coleman <kayakfishtx at gmail.com>
>> wrote:
>>> This morning, Glenn AA5PK, and I had a QSO via the experimental
>>> transponder activated on LilacSat-2. It was very interesting and fun.
>>> A non-inverting mode J transponder was new to me.
>>>
>>> Using manual tuning to adjust for Doppler shift proved to be a small
>>> challenge as I am more accustomed to operating on a transponder like
>>> FO-29. Running SDR in parallel to my Icom IC-9100 gave me a good
>>> visual representation of the transponder pass band.
>>>
>>> You can listen to a brief clip of our QSO here:
>>>
>>
>> _______________________________________________
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>> 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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