[amsat-bb] AMSAT-BB Digest, Vol 10, Issue 346
Todd W. Deckard
twdeckard at earthlink.net
Mon Nov 9 02:28:05 UTC 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 at amsat.org wrote:
>
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> 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 at vt.edu>
> To: amsat-bb at amsat.org
> Subject: Re: [amsat-bb] FM signal on FO-29?
> Message-ID: <563FD2A4.9050200 at vt.edu>
> Content-Type: text/plain; charset=windows-1252; format=flowed
>
> Send AMSAT-BB mailing list submissions to
> amsat-bb at 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 at amsat.org
>
> You can reach the person managing the list at
> amsat-bb-owner at amsat.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of AMSAT-BB digest..."
>
>
> 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 at vt.edu>
> To: amsat-bb at amsat.org
> Subject: Re: [amsat-bb] FM signal on FO-29?
> Message-ID: <563FD2A4.9050200 at 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 at 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 at fisher.cc>
> To: Paul Stoetzer <n8hm at arrl.net>
> Cc: Clayton W5PFG <w5pfg at amsat.org>, "amsat-bb at amsat.org"
> <amsat-bb at amsat.org>
> Subject: Re: [amsat-bb] FM signal on FO-29?
> Message-ID:
> <CABX7KxWCRhJ+3093GEruVQcBgLhpHhQYqGR9bLmAgTC+4hy3QQ at 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 at 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 at 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 at 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 at 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 at usna.edu>
> To: Zach Leffke <zleffke at vt.edu>
> Cc: amsat bb <amsat-bb at amsat.org>
> Subject: Re: [amsat-bb] FM signal on FO-29?
> Message-ID:
> <CALdCfNK9ctph66fy-=+Cd4k6oPxYM4rUVVUNwbCduPtWdzLmKA at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> Zach
>
>> On Sun, Nov 8, 2015 at 5:54 PM, Zach Leffke <zleffke at 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 at 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 at 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 at usna.edu>
> To: Zach Leffke <zleffke at vt.edu>
> Cc: amsat bb <amsat-bb at amsat.org>
> Subject: Re: [amsat-bb] FM signal on FO-29?
> Message-ID:
> <CALdCfN+cyT1Cj_KYyeXisB_Hds5runD6fOoRfkLuohdfSC+u6Q at 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 at 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 at 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 at 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 at vt.edu>
> To: amsat-bb at amsat.org
> Subject: Re: [amsat-bb] FM signal on FO-29?
> Message-ID: <563FDB19.7070501 at 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 at 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 at 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 at 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 at gmail.com>
> To: "'Zach Leffke'" <zleffke at vt.edu>, <amsat-bb at 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 at amsat.org] En nombre de Zach Leffke
> Enviado el: Sunday, November 08, 2015 4:54 PM
> Para: amsat-bb at 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 at 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 at 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 at vt.edu>
> To: Hector W5CBF/CO6CBF <kf5yxv at gmail.com>, amsat-bb at amsat.org
> Subject: Re: [amsat-bb] FM signal on FO-29?
> Message-ID: <563FDD80.1010702 at 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 at amsat.org] En nombre de Zach Leffke
>> Enviado el: Sunday, November 08, 2015 4:54 PM
>> Para: amsat-bb at 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 at 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 at 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 at vt.edu>
> To: Robert Bruninga <bruninga at usna.edu>
> Cc: amsat bb <amsat-bb at amsat.org>
> Subject: Re: [amsat-bb] FM signal on FO-29?
> Message-ID: <563FE0D4.5020503 at 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 at vt.edu
>> <mailto:zleffke at 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 at amsat.org <mailto:AMSAT-BB at 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 at amsat.org <mailto:AMSAT-BB at 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 at bigpond.com>
> To: <amsat-bb at amsat.org>
> Subject: Re: [amsat-bb] FM signal on FO-29
> Message-ID: <BLU436-SMTP20894C252E8F97C94778D4685150 at 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 at charter.net>
> To: "'Stefan Wagener'" <wageners at gmail.com>, "'AMSAT BB'"
> <amsat-bb at 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 at 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:
>
> 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
> _______________________________________________
> Sent via AMSAT-BB at 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 at gmail.com>
> To: amsat-bb at amsat.org
> Subject: [amsat-bb] Fm activity on FO29
> Message-ID:
> <CACm2je12MnYrso645LUPCBvn58vCNsjingQA1DZpy+rgq5KXFg at 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 at 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
> *****************************************
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