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CX2SA > SATDIG 09.11.15 02:56l 847 Lines 33342 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: FM signal on FO-29? (Zach Leffke)
2. Re: FM signal on FO-29? (Burns Fisher)
3. Re: FM signal on FO-29? (Robert Bruninga)
4. Re: FM signal on FO-29? (Robert Bruninga)
5. Re: FM signal on FO-29? (Zach Leffke)
6. Re: FM signal on FO-29? (Hector W5CBF/CO6CBF)
7. Re: FM signal on FO-29? (Zach Leffke)
8. Re: FM signal on FO-29? (Zach Leffke)
9. Re: FM signal on FO-29 (VK4NBL)
10. Re: Frequency chart and satellite information -online- (Ted)
11. Fm activity on FO29 (jeffory broughton)
----------------------------------------------------------------------
Message: 1
Date: Sun, 8 Nov 2015 17:54:28 -0500
From: Zach Leffke <zleffke@xx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID: <563FD2A4.9050200@xx.xxx>
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@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: Sun, 8 Nov 2015 18:04:49 -0500
From: Burns Fisher <burns@xxxxxx.xx>
To: Paul Stoetzer <n8hm@xxxx.xxx>
Cc: Clayton W5PFG <w5pfg@xxxxx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID:
<CABX7KxWCRhJ+3093GEruVQcBgLhpHhQYqGR9bLmAgTC+4hy3QQ@xxxx.xxxxx.xxx>
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@xxxx.xxx> 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@xxxxx.xxx> 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@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: 3
Date: Sun, 8 Nov 2015 18:10:48 -0500
From: Robert Bruninga <bruninga@xxxx.xxx>
To: Zach Leffke <zleffke@xx.xxx>
Cc: amsat bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID:
<CALdCfNK9ctph66fy-=+Cd4k6oPxYM4rUVVUNwbCduPtWdzLmKA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Zach
On Sun, Nov 8, 2015 at 5:54 PM, Zach Leffke <zleffke@xx.xxx> 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@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: 4
Date: Sun, 8 Nov 2015 18:12:35 -0500
From: Robert Bruninga <bruninga@xxxx.xxx>
To: Zach Leffke <zleffke@xx.xxx>
Cc: amsat bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID:
<CALdCfN+cyT1Cj_KYyeXisB_Hds5runD6fOoRfkLuohdfSC+u6Q@xxxx.xxxxx.xxx>
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@xx.xxx> 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@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: 5
Date: Sun, 8 Nov 2015 18:30:33 -0500
From: Zach Leffke <zleffke@xx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID: <563FDB19.7070501@xx.xxx>
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@xxxxx.xxx> 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@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: 6
Date: Sun, 8 Nov 2015 17:34:43 -0600
From: "Hector W5CBF/CO6CBF" <kf5yxv@xxxxx.xxx>
To: "'Zach Leffke'" <zleffke@xx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID: <01dd01d11a7e$0d033310$27099930$@xxxxx.xxx>
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@xxxxx.xxxx En nombre de Zach Leffke
Enviado el: Sunday, November 08, 2015 4:54 PM
Para: amsat-bb@xxxxx.xxx
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@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: Sun, 8 Nov 2015 18:40:48 -0500
From: Zach Leffke <zleffke@xx.xxx>
To: Hector W5CBF/CO6CBF <kf5yxv@xxxxx.xxx>, amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID: <563FDD80.1010702@xx.xxx>
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@xxxxx.xxxx En nombre de Zach Leffke
> Enviado el: Sunday, November 08, 2015 4:54 PM
> Para: amsat-bb@xxxxx.xxx
> 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@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: 8
Date: Sun, 8 Nov 2015 18:55:00 -0500
From: Zach Leffke <zleffke@xx.xxx>
To: Robert Bruninga <bruninga@xxxx.xxx>
Cc: amsat bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] FM signal on FO-29?
Message-ID: <563FE0D4.5020503@xx.xxx>
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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@xx.xxx
> <mailto:zleffke@xx.xxx>> 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
>
> _______________________________________________
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>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx <mailto:AMSAT-BB@xxxxx.xxx>. AMSAT-NA
> makes this open forum available
> to all interested persons worldwide without requiring membership.
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> are solely those of the author, and do not reflect the official
> views of AMSAT-NA.
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------------------------------
Message: 9
Date: Mon, 9 Nov 2015 10:21:57 +1000
From: VK4NBL <vk4nbl@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] FM signal on FO-29
Message-ID: <BLU436-SMTP20894C252E8F97C94778D4685150@xxx.xxx>
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@xxxxxxx.xxx>
To: "'Stefan Wagener'" <wageners@xxxxx.xxx>, "'AMSAT BB'"
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Frequency chart and satellite information
-online-
Message-ID: <000801d11a85$e8322cf0$b89686d0$@xxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Good stuff, Stefan...tnx!
73, K7trk
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx 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:
1. From Mineo Wakita, JE9PEL
http://www.ne.jp/asahi/hamradio/je9pel/satslist.htm
2. From Mike Rupprecht, DK3WN
http://www.dk3wn.info/satellites.shtml
Bookmarked on my Mac for immediate access :-)
Stefan, VE4NSA
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Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available to all
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------------------------------
Message: 11
Date: Sun, 8 Nov 2015 19:46:38 -0500
From: jeffory broughton <jefforybroughton@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Fm activity on FO29
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<CACm2je12MnYrso645LUPCBvn58vCNsjingQA1DZpy+rgq5KXFg@xxxx.xxxxx.xxx>
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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@xxxxx.xxx.
AMSAT-NA makes this open forum available to all interested persons worldwide
without requiring membership. Opinions expressed
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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
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