FM signal on FO-29

9 Nov 2015

      It's not uncommon to hear Brazilian pirates on FLTSAT and UFO military satcom frequencies.   I wonder if the recent crackdowns have pushed them to the OSCARS.
Sent from my iPhone
...
On Nov 8, 2015, at 6:46 PM, amsat-bb-request@amsat.org wrote:
Send AMSAT-BB mailing list submissions to
   amsat-bb@amsat.org
To subscribe or unsubscribe via the World Wide Web, visit
   http://www.amsat.org/mailman/listinfo/amsat-bb
or, via email, send a message with subject or body 'help' to
   amsat-bb-request@amsat.org
You can reach the person managing the list at
   amsat-bb-owner@amsat.org
When replying, please edit your Subject line so it is more specific
than "Re: Contents of AMSAT-BB digest..."
Today's Topics:

Re: FM signal on FO-29? (Zach Leffke)
Re: FM signal on FO-29? (Burns Fisher)
Re: FM signal on FO-29? (Robert Bruninga)
Re: FM signal on FO-29? (Robert Bruninga)
Re: FM signal on FO-29? (Zach Leffke)
Re: FM signal on FO-29? (Hector W5CBF/CO6CBF)
Re: FM signal on FO-29? (Zach Leffke)
Re: FM signal on FO-29? (Zach Leffke)
Re: FM signal on FO-29 (VK4NBL)
Re: Frequency chart and satellite information -online- (Ted)
Fm activity on FO29 (jeffory broughton)

Message: 1
Date: Sun, 8 Nov 2015 17:54:28 -0500
From: Zach Leffke zleffke@vt.edu
To: amsat-bb@amsat.org
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID: 563FD2A4.9050200@vt.edu
Content-Type: text/plain; charset=windows-1252; format=flowed
well.. when I say students, I meant graduate students at VT that 
happened to be in the lab when I was doing the experiment.  They work 
with me and Bob, so a few crude words here and there aren't uncommon to 
them.
But good point, probably not the best thing for a public demo if your 
audience is a bit younger.
Actually, I've seen so much FM activity (basically every time I've 
monitored FO-29 since we first came online in late september) that I've 
been toying with the idea of trying to locate where the source emitters 
actually are located based on doppler shift data.  We know the doppler 
between the receiving ground station and FO-29, so we can back that 
out.  We know the transponder mapping, so we can work through that to 
determine what the center frequency is as the signal enters the 
transponder uplink receiver.  What we don't know is the uplink doppler, 
because we don't know where the emitter is and we don't know what exact 
center frequency they are on (but I bet you its in 5kHz steps, maybe 
2.5kHz).  So we have two unknowns.  I'm betting there's a way to work 
through it though, and with enough observations and by watching the rate 
of change of the doppler, I bet there's a way to make an educated guess 
on what their center freq and location are.
Or if someone listening knows Spanish and/or Portugese, maybe we could 
get lucky and hear what cross streets the taxi is going to (if it is in 
fact a taxi).
-Zach, KJ4QLP
...
On 11/08/2015 05:30 PM, Clayton W5PFG wrote:
I wouldn't recommend playing the FM audio heard via FO-29 to a group 
of children. Normally it's not English.  It's most likely NOT a 
religious broadcast based on their choice of crude words.
73
Clayton
W5PFG
...
On 11/8/2015 16:13, Zach Leffke wrote:
So yes, in the last couple weeks I've seen a LOT of FM activity on
FO-29.  And based on my experience with Friday's pass, which was
ascending, I'm leading towards the Central/South America QRM theory.
Lots of strong FM activity as the pass started and the satellite was
over the lower latitudes, but as FO-29 ascended over higher latitudes
towards the north pole, the FM activity died down.
-Zach, KJ4QLP

Sent via AMSAT-BB@amsat.org. 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: Sun, 8 Nov 2015 18:04:49 -0500
From: Burns Fisher burns@fisher.cc
To: Paul Stoetzer n8hm@arrl.net
Cc: Clayton W5PFG w5pfg@amsat.org, "amsat-bb@amsat.org"
   amsat-bb@amsat.org
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID:
   CABX7KxWCRhJ+3093GEruVQcBgLhpHhQYqGR9bLmAgTC+4hy3QQ@mail.gmail.com
Content-Type: text/plain; charset=UTF-8
Fun and interesting!  AO85 and AO73 have been coinciding frequently of
late, but they are not compatible.
...
On Sun, Nov 8, 2015 at 5:33 PM, Paul Stoetzer n8hm@arrl.net wrote:
Speaking of FM signals on FO-29, you'll be able to hear the AO-85
transponder through FO-29 when their paths cross as well. I wonder if
you could get a high enough SNR to decode the DUV...
73,
Paul, N8HM
...
On Sun, Nov 8, 2015 at 5:30 PM, Clayton W5PFG w5pfg@amsat.org wrote:
I wouldn't recommend playing the FM audio heard via FO-29 to a group of
children. Normally it's not English.  It's most likely NOT a religious
broadcast based on their choice of crude words.
73
Clayton
W5PFG
...
On 11/8/2015 16:13, Zach Leffke wrote:
So yes, in the last couple weeks I've seen a LOT of FM activity on
FO-29.  And based on my experience with Friday's pass, which was
ascending, I'm leading towards the Central/South America QRM theory.
Lots of strong FM activity as the pass started and the satellite was
over the lower latitudes, but as FO-29 ascended over higher latitudes
towards the north pole, the FM activity died down.
-Zach, KJ4QLP

Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

Sent via AMSAT-BB@amsat.org. 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: 3
Date: Sun, 8 Nov 2015 18:10:48 -0500
From: Robert Bruninga bruninga@usna.edu
To: Zach Leffke zleffke@vt.edu
Cc: amsat bb amsat-bb@amsat.org
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID:
   CALdCfNK9ctph66fy-=+Cd4k6oPxYM4rUVVUNwbCduPtWdzLmKA@mail.gmail.com
Content-Type: text/plain; charset=UTF-8
Zach
...
On Sun, Nov 8, 2015 at 5:54 PM, Zach Leffke zleffke@vt.edu wrote:
well.. when I say students, I meant graduate students at VT that happened
to be in the lab when I was doing the experiment.  They work with me and
Bob, so a few crude words here and there aren't uncommon to them.
But good point, probably not the best thing for a public demo if your
audience is a bit younger.
Actually, I've seen so much FM activity (basically every time I've
monitored FO-29 since we first came online in late september) that I've
been toying with the idea of trying to locate where the source emitters
actually are located based on doppler shift data.  We know the doppler
between the receiving ground station and FO-29, so we can back that out.
We know the transponder mapping, so we can work through that to determine
what the center frequency is as the signal enters the transponder uplink
receiver.  What we don't know is the uplink doppler, because we don't know
where the emitter is and we don't know what exact center frequency they are
on (but I bet you its in 5kHz steps, maybe 2.5kHz).  So we have two
unknowns.  I'm betting there's a way to work through it though, and with
enough observations and by watching the rate of change of the doppler, I
bet there's a way to make an educated guess on what their center freq and
location are.
Or if someone listening knows Spanish and/or Portugese, maybe we could get
lucky and hear what cross streets the taxi is going to (if it is in fact a
taxi).
-Zach, KJ4QLP
...
On 11/08/2015 05:30 PM, Clayton W5PFG wrote:
I wouldn't recommend playing the FM audio heard via FO-29 to a group of
children. Normally it's not English.  It's most likely NOT a religious
broadcast based on their choice of crude words.
73
Clayton
W5PFG
...
On 11/8/2015 16:13, Zach Leffke wrote:
So yes, in the last couple weeks I've seen a LOT of FM activity on
FO-29.  And based on my experience with Friday's pass, which was
ascending, I'm leading towards the Central/South America QRM theory.
Lots of strong FM activity as the pass started and the satellite was
over the lower latitudes, but as FO-29 ascended over higher latitudes
towards the north pole, the FM activity died down.
-Zach, KJ4QLP

Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

Sent via AMSAT-BB@amsat.org. 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, 8 Nov 2015 18:12:35 -0500
From: Robert Bruninga bruninga@usna.edu
To: Zach Leffke zleffke@vt.edu
Cc: amsat bb amsat-bb@amsat.org
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID:
   CALdCfN+cyT1Cj_KYyeXisB_Hds5runD6fOoRfkLuohdfSC+u6Q@mail.gmail.com
Content-Type: text/plain; charset=UTF-8
Zach
You dont need to know the senders exact freq, just a plot of his freq
during the pass will form an "S" curve and once you have enough of the "S",
you can know his center freq, and hence his closest point of approach.
That gives a line of bearing.  Anothe pass gives another one, and so on...
bob
...
On Sun, Nov 8, 2015 at 5:54 PM, Zach Leffke zleffke@vt.edu wrote:
well.. when I say students, I meant graduate students at VT that happened
to be in the lab when I was doing the experiment.  They work with me and
Bob, so a few crude words here and there aren't uncommon to them.
But good point, probably not the best thing for a public demo if your
audience is a bit younger.
Actually, I've seen so much FM activity (basically every time I've
monitored FO-29 since we first came online in late september) that I've
been toying with the idea of trying to locate where the source emitters
actually are located based on doppler shift data.  We know the doppler
between the receiving ground station and FO-29, so we can back that out.
We know the transponder mapping, so we can work through that to determine
what the center frequency is as the signal enters the transponder uplink
receiver.  What we don't know is the uplink doppler, because we don't know
where the emitter is and we don't know what exact center frequency they are
on (but I bet you its in 5kHz steps, maybe 2.5kHz).  So we have two
unknowns.  I'm betting there's a way to work through it though, and with
enough observations and by watching the rate of change of the doppler, I
bet there's a way to make an educated guess on what their center freq and
location are.
Or if someone listening knows Spanish and/or Portugese, maybe we could get
lucky and hear what cross streets the taxi is going to (if it is in fact a
taxi).
-Zach, KJ4QLP
...
On 11/08/2015 05:30 PM, Clayton W5PFG wrote:
I wouldn't recommend playing the FM audio heard via FO-29 to a group of
children. Normally it's not English.  It's most likely NOT a religious
broadcast based on their choice of crude words.
73
Clayton
W5PFG
...
On 11/8/2015 16:13, Zach Leffke wrote:
So yes, in the last couple weeks I've seen a LOT of FM activity on
FO-29.  And based on my experience with Friday's pass, which was
ascending, I'm leading towards the Central/South America QRM theory.
Lots of strong FM activity as the pass started and the satellite was
over the lower latitudes, but as FO-29 ascended over higher latitudes
towards the north pole, the FM activity died down.
-Zach, KJ4QLP

Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

Sent via AMSAT-BB@amsat.org. 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: Sun, 8 Nov 2015 18:30:33 -0500
From: Zach Leffke zleffke@vt.edu
To: amsat-bb@amsat.org
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID: 563FDB19.7070501@vt.edu
Content-Type: text/plain; charset=windows-1252; format=flowed
Sweet, second cross link signal to look into!  I missed that, you got 
the gears turning.......
So lets see....  145.900MHz to 146.000MHz for FO-29 passband.
A quick look through JE9PEL satlist reveals these downlinks:
AO73 tlm bcn, 145.935 MHz
AO73 transponder, 145.970-145.950 MHz
AO85, 145.978 MHz
First-MOVE cubesat (NORAD ID 39439), 145.970MHz
DUCHIFAT, 145.980 MHz
QB50p1/FUNcube3 (EO-79) transponder, 145.970-145.945 MHz
VELOX-I, 145.980 MHz
UKube-1/FUNcube-2, 145.915 MHz
DeorbitSail, 145.975 MHz
CAS-3E (XW-2E) transponder, 145.935-145.915 MHz
CAS-3F (XW-2F) transponder, 146.000-146.980 MHz
Fox-1B, 145.960 MHz
Fox-1C, 145.920 MHz
I guess its not that surprising when FO-29 has half of the 2m Satellite 
Service allocation for its uplink.  Next thing to do is figure out which 
ones are the most likely to be successful based on power levels, 
modulation schemes, transmission rate, which ones are using Forward 
Error Correction, etc.  And then look at the orbits for possible chain 
events.
fun stuff!
Does anyone know the uplink receiver sensitivity and antenna gain/design 
on FO-29?
-Zach, KJ4QLP
...
On 11/08/2015 05:33 PM, Paul Stoetzer wrote:
Speaking of FM signals on FO-29, you'll be able to hear the AO-85
transponder through FO-29 when their paths cross as well. I wonder if
you could get a high enough SNR to decode the DUV...
73,
Paul, N8HM
...
On Sun, Nov 8, 2015 at 5:30 PM, Clayton W5PFG w5pfg@amsat.org wrote:
I wouldn't recommend playing the FM audio heard via FO-29 to a group of
children. Normally it's not English.  It's most likely NOT a religious
broadcast based on their choice of crude words.
73
Clayton
W5PFG
...
On 11/8/2015 16:13, Zach Leffke wrote:
So yes, in the last couple weeks I've seen a LOT of FM activity on
FO-29.  And based on my experience with Friday's pass, which was
ascending, I'm leading towards the Central/South America QRM theory.
Lots of strong FM activity as the pass started and the satellite was
over the lower latitudes, but as FO-29 ascended over higher latitudes
towards the north pole, the FM activity died down.
-Zach, KJ4QLP

Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

Sent via AMSAT-BB@amsat.org. 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: Sun, 8 Nov 2015 17:34:43 -0600
From: "Hector W5CBF/CO6CBF" kf5yxv@gmail.com
To: "'Zach Leffke'" zleffke@vt.edu,    amsat-bb@amsat.org
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID: 01dd01d11a7e$0d033310$27099930$@gmail.com
Content-Type: text/plain;    charset="us-ascii"
Hi Zach and group
I think, the main problem is they are not always the same stations. I have
heard several different stations in terrestrial QSOs QRMing  FO-29; majority
of them speaking Spanish and without any kind of ID. I have not heard them
recently, though.
73!
Hector, CO6CBF/W5CBF
-----Mensaje original-----
De: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] En nombre de Zach Leffke
Enviado el: Sunday, November 08, 2015 4:54 PM
Para: amsat-bb@amsat.org
Asunto: Re: [amsat-bb] FM signal on FO-29?
well.. when I say students, I meant graduate students at VT that happened to
be in the lab when I was doing the experiment.  They work with me and Bob,
so a few crude words here and there aren't uncommon to them.
But good point, probably not the best thing for a public demo if your
audience is a bit younger.
Actually, I've seen so much FM activity (basically every time I've monitored
FO-29 since we first came online in late september) that I've been toying
with the idea of trying to locate where the source emitters actually are
located based on doppler shift data.  We know the doppler between the
receiving ground station and FO-29, so we can back that out.  We know the
transponder mapping, so we can work through that to determine what the
center frequency is as the signal enters the transponder uplink receiver.
What we don't know is the uplink doppler, because we don't know where the
emitter is and we don't know what exact center frequency they are on (but I
bet you its in 5kHz steps, maybe 2.5kHz).  So we have two unknowns.  I'm
betting there's a way to work through it though, and with enough
observations and by watching the rate of change of the doppler, I bet
there's a way to make an educated guess on what their center freq and
location are.
Or if someone listening knows Spanish and/or Portugese, maybe we could get
lucky and hear what cross streets the taxi is going to (if it is in fact a
taxi).
-Zach, KJ4QLP
...
On 11/08/2015 05:30 PM, Clayton W5PFG wrote:
I wouldn't recommend playing the FM audio heard via FO-29 to a group 
of children. Normally it's not English.  It's most likely NOT a 
religious broadcast based on their choice of crude words.
73
Clayton
W5PFG
...
On 11/8/2015 16:13, Zach Leffke wrote:
So yes, in the last couple weeks I've seen a LOT of FM activity on 
FO-29.  And based on my experience with Friday's pass, which was 
ascending, I'm leading towards the Central/South America QRM theory.
Lots of strong FM activity as the pass started and the satellite was 
over the lower latitudes, but as FO-29 ascended over higher latitudes 
towards the north pole, the FM activity died down.
-Zach, KJ4QLP

Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available 
to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views 
of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite 
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

Sent via AMSAT-BB@amsat.org. 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, 8 Nov 2015 18:40:48 -0500
From: Zach Leffke zleffke@vt.edu
To: Hector W5CBF/CO6CBF kf5yxv@gmail.com, amsat-bb@amsat.org
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID: 563FDD80.1010702@vt.edu
Content-Type: text/plain; charset=windows-1252; format=flowed
That makes sense Hector.  I've seen the FM activity kind of all over the 
transponder. More so than I would expect if it was the same transmitter 
each time on the same frequency and the different pass geometries 
causing a bit of swing due to doppler.
-Zach, KJ4QLP
...
On 11/08/2015 06:34 PM, Hector W5CBF/CO6CBF wrote:
Hi Zach and group
I think, the main problem is they are not always the same stations. I have
heard several different stations in terrestrial QSOs QRMing  FO-29; majority
of them speaking Spanish and without any kind of ID. I have not heard them
recently, though.
73!
Hector, CO6CBF/W5CBF
-----Mensaje original-----
De: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] En nombre de Zach Leffke
Enviado el: Sunday, November 08, 2015 4:54 PM
Para: amsat-bb@amsat.org
Asunto: Re: [amsat-bb] FM signal on FO-29?
well.. when I say students, I meant graduate students at VT that happened to
be in the lab when I was doing the experiment.  They work with me and Bob,
so a few crude words here and there aren't uncommon to them.
But good point, probably not the best thing for a public demo if your
audience is a bit younger.
Actually, I've seen so much FM activity (basically every time I've monitored
FO-29 since we first came online in late september) that I've been toying
with the idea of trying to locate where the source emitters actually are
located based on doppler shift data.  We know the doppler between the
receiving ground station and FO-29, so we can back that out.  We know the
transponder mapping, so we can work through that to determine what the
center frequency is as the signal enters the transponder uplink receiver.
What we don't know is the uplink doppler, because we don't know where the
emitter is and we don't know what exact center frequency they are on (but I
bet you its in 5kHz steps, maybe 2.5kHz).  So we have two unknowns.  I'm
betting there's a way to work through it though, and with enough
observations and by watching the rate of change of the doppler, I bet
there's a way to make an educated guess on what their center freq and
location are.
Or if someone listening knows Spanish and/or Portugese, maybe we could get
lucky and hear what cross streets the taxi is going to (if it is in fact a
taxi).
-Zach, KJ4QLP
...
On 11/08/2015 05:30 PM, Clayton W5PFG wrote:
I wouldn't recommend playing the FM audio heard via FO-29 to a group
of children. Normally it's not English.  It's most likely NOT a
religious broadcast based on their choice of crude words.
73
Clayton
W5PFG
...
On 11/8/2015 16:13, Zach Leffke wrote:
So yes, in the last couple weeks I've seen a LOT of FM activity on
FO-29.  And based on my experience with Friday's pass, which was
ascending, I'm leading towards the Central/South America QRM theory.
Lots of strong FM activity as the pass started and the satellite was
over the lower latitudes, but as FO-29 ascended over higher latitudes
towards the north pole, the FM activity died down.
-Zach, KJ4QLP

Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views
of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all
interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

Message: 8
Date: Sun, 8 Nov 2015 18:55:00 -0500
From: Zach Leffke zleffke@vt.edu
To: Robert Bruninga bruninga@usna.edu
Cc: amsat bb amsat-bb@amsat.org
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID: 563FE0D4.5020503@vt.edu
Content-Type: text/plain; charset=utf-8; format=flowed
Good point Bob.  I haven't fully worked through the problem yet, but 
thats pretty much right in line with what I'm thinking.  Thats what I 
meant by saying watching the 'rate of change of doppler.'  When the 
slope of the doppler s-curve is at a maximum, that should be the point 
of closest approach.
Actually, that brings up a question.  Do you know what type of equation 
would fit the doppler S-Curve profile?  something that could be used to 
generate a regression equation from a few doppler observations?
-Zach, KJ4QLP
...
On 11/08/2015 06:12 PM, Robert Bruninga wrote:
Zach
You dont need to know the senders exact freq, just a plot of his freq 
during the pass will form an "S" curve and once you have enough of the 
"S", you can know his center freq, and hence his closest point of 
approach.  That gives a line of bearing.  Anothe pass gives another 
one, and so on...
bob
On Sun, Nov 8, 2015 at 5:54 PM, Zach Leffke <zleffke@vt.edu 
mailto:zleffke@vt.edu> wrote:
well.. when I say students, I meant graduate students at VT that
   happened to be in the lab when I was doing the experiment.  They
   work with me and Bob, so a few crude words here and there aren't
   uncommon to them.
But good point, probably not the best thing for a public demo if
   your audience is a bit younger.
Actually, I've seen so much FM activity (basically every time I've
   monitored FO-29 since we first came online in late september) that
   I've been toying with the idea of trying to locate where the
   source emitters actually are located based on doppler shift data. 
   We know the doppler between the receiving ground station and
   FO-29, so we can back that out.  We know the transponder mapping,
   so we can work through that to determine what the center frequency
   is as the signal enters the transponder uplink receiver.  What we
   don't know is the uplink doppler, because we don't know where the
   emitter is and we don't know what exact center frequency they are
   on (but I bet you its in 5kHz steps, maybe 2.5kHz).  So we have
   two unknowns. I'm betting there's a way to work through it though,
   and with enough observations and by watching the rate of change of
   the doppler, I bet there's a way to make an educated guess on what
   their center freq and location are.
Or if someone listening knows Spanish and/or Portugese, maybe we
   could get lucky and hear what cross streets the taxi is going to
   (if it is in fact a taxi).
-Zach, KJ4QLP
On 11/08/2015 05:30 PM, Clayton W5PFG wrote:
   I wouldn't recommend playing the FM audio heard via FO-29 to a
   group of children. Normally it's not English.  It's most
   likely NOT a religious broadcast based on their choice of
   crude words.

   73
   Clayton
   W5PFG

   On 11/8/2015 16:13, Zach Leffke wrote:

       So yes, in the last couple weeks I've seen a LOT of FM
       activity on
       FO-29.  And based on my experience with Friday's pass,
       which was
       ascending, I'm leading towards the Central/South America
       QRM theory.
       Lots of strong FM activity as the pass started and the
       satellite was
       over the lower latitudes, but as FO-29 ascended over
       higher latitudes
       towards the north pole, the FM activity died down.

       -Zach, KJ4QLP

   _______________________________________________
   Sent via AMSAT-BB@amsat.org <mailto:AMSAT-BB@amsat.org>.
   AMSAT-NA makes this open forum available
   to all interested persons worldwide without requiring
   membership. Opinions expressed
   are solely those of the author, and do not reflect the
   official views of AMSAT-NA.
   Not an AMSAT-NA member? Join now to support the amateur
   satellite program!
   Subscription settings:
   http://www.amsat.org/mailman/listinfo/amsat-bb

Sent via AMSAT-BB@amsat.org mailto:AMSAT-BB@amsat.org. 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: 9
Date: Mon, 9 Nov 2015 10:21:57 +1000
From: VK4NBL vk4nbl@bigpond.com
To: amsat-bb@amsat.org
Subject: Re: [amsat-bb] FM signal on FO-29
Message-ID: BLU436-SMTP20894C252E8F97C94778D4685150@phx.gbl
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
   reply-type=original
With regards to FM signals on FO-29, we can also here them here in 
Australia.
This is most noticeable when the Sat is travelling South to North.
When it gets above Northern Queensland all we can hear is Indonesian fishing 
boats on the 2m uplink.
It does suck the power from the Sat and usually ends some very good QSO's 
long before LOS.
73
Peter
vk4nbl

Message: 10
Date: Sun, 8 Nov 2015 16:30:59 -0800
From: "Ted" k7trkradio@charter.net
To: "'Stefan Wagener'" wageners@gmail.com, "'AMSAT BB'"
   amsat-bb@amsat.org
Subject: Re: [amsat-bb] Frequency chart and satellite information
   -online-
Message-ID: 000801d11a85$e8322cf0$b89686d0$@charter.net
Content-Type: text/plain;    charset="us-ascii"
Good stuff, Stefan...tnx!
73, K7trk
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Stefan
Wagener
Sent: Sunday, November 08, 2015 6:12 AM
To: AMSAT BB
Subject: [amsat-bb] Frequency chart and satellite information -online-
Hi folks,
Some of the most comprehensive and very frequently updated sources of
amateur radio satellite information can be found here:

From Mineo Wakita, JE9PEL

http://www.ne.jp/asahi/hamradio/je9pel/satslist.htm

From Mike Rupprecht, DK3WN

http://www.dk3wn.info/satellites.shtml
Bookmarked on my Mac for immediate access :-)
Stefan, VE4NSA
_______________________________________________
Sent via AMSAT-BB@amsat.org. 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: Sun, 8 Nov 2015 19:46:38 -0500
From: jeffory broughton jefforybroughton@gmail.com
To: amsat-bb@amsat.org
Subject: [amsat-bb] Fm activity on FO29
Message-ID:
   CACm2je12MnYrso645LUPCBvn58vCNsjingQA1DZpy+rgq5KXFg@mail.gmail.com
Content-Type: text/plain; charset=UTF-8
A couple weeks ago . fo29 made a pass over canada.I am in michigan and I
was barely in the footprint when I clearly heard two guys loading trucks on
the upper end of the transponder .it almost had to be coming from canada.
jeff broughton

Subject: Digest Footer

Sent via amsat-bb@amsat.org.
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 10, Issue 346

Todd W. Deckard

tags (0)

participants (1)