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Today's Topics:
1. Re: A suggestion for Experimenter's Wednesdays on AO-91
(E.Mike McCardel)
2. Images received from ATHENOXAT-1 (Roland Zurmely)
3. Re: Wouxun KG-UV8D (Pedro Dutra Sousa)
4. FUNcube Warehouse Outage (David Johnson)
5. Re: A suggestion for Experimenter's Wednesdays on AO-91
(JoAnne K9JKM)
6. Re: A suggestion for Experimenter's Wednesdays on AO-91
(E.Mike McCardel)
7. Re: A suggestion for Experimenter's Wednesdays on (PSAT?)
(Robert Bruninga)
8. Re: A suggestion for Experimenter's Wednesdays on AO-91
(Jeff Johns)
9. A suggestion for ... Emergency Comms - APRS... (Robert Bruninga)
10. Re: A suggestion for Experimenter's Wednesdays on AO-91
(Mac A. Cody)
----------------------------------------------------------------------
Message: 1
Date: Fri, 15 Dec 2017 09:11:31 -0500
From: "E.Mike McCardel" <mccardelm@xxxxx.xxx>
To: "Mac A. Cody" <maccody@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] A suggestion for Experimenter's Wednesdays on
AO-91
Message-ID: <0B3DD967-7D33-4150-B236-125AF5FE83D2@xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
It seems to me that the limiting factor for using LEO satellites as an
Emergency Response of any scale, would the short amount of time of a given
pass and the limited number of usable passes a day over an area needing the
response. I?m not sure experimentation would find ways around this
limitation. But of course experimentation is just that.
Perhaps we need to get out of the box for how Experimenter?s Wednesdays
work. What modes can we adapt? Can we incorporate an educational initiative,
similar to ISS school contacts? Remote control APRS messaging as Mark
Spencer demonstrated with MAREA? I know these seem like we are limiting
contacts to just a few people, but they can reach hundreds of students and
introduce satellite and radio enthusiasm to another generation of school
children and millennial.
73
EMike
EMike McCardel, AA8EM
Rotating Editor AMSAT News Service
Sent from my iPhone
> On Dec 15, 2017, at 1:26 AM, Mac A. Cody <maccody@xxx.xxx> wrote:
>
> Scott,
>
> I'm embarrassed to say that I've never done anything personally with
NBEMS. What I
> knowabout it isfrom a presentation at my radio club. We have had a group
that was
> experimenting with NBEMS on the club repeater. Don't know whether they
are still
> doing it, though. They weren't using any special interface between radios
and
> computers - speaker output to microphone input in both directions. I'd
like to try
> NBEMS on the FM birds simply as a way of experimenting with using LEO
birds for
> emergency response.
>
> As you mentioned, there is a lot of sites out there describing how to use
NBEMS using
> Fldigi/Flmsg. I have not seen anything specific, yet, regarding to using
NBEMS over
> a satellite. I'm sure that there are attendant challenges and
opportunities doing so.
> Doppler shift and signal quality will be the main challenges. MT65 appears
to be the
> modulation scheme of choice. Full duplex operation would be helpful, as
you could
> monitor your own signal to verify its quality and how well the message got
through.
>
> I'll have to investigate further.
>
> 73,
>
> Mac Cody - AE5PH
>
>> On 12/14/2017 11:38 PM, Scott wrote:
>> I've always been curious about NBEMS as well, Mac.
>>
>> There is a fair amount of info on the subject online, but could you point
me to any particular orientation how-to that might be geared to someone
using it in a more informal setting such as how we might use it via an FM
satellite?
>>
>> -Scott, K4KDR
>>
>>
>> ========================
>>
>> -----Original Message----- From: Patrick STODDARD (WD9EWK/VA7EWK)
>> Sent: Friday, December 15, 2017 12:29 AM
>> To: Mac A. Cody
>> Cc: amsat-bb@xxxxx.xxx
>> Subject: Re: [amsat-bb] A suggestion for Experimenter's Wednesdays on AO-91
>>
>> Mac,
>>
>> Now that's a good idea. Otherwise, Wednesdays on AO-85
>> could be called SSTV Wednesdays, if that's the extent
>> of "Experimenter's Wednesdays" for that satellite. I would
>> be inclined to try NBEMS, something I've never used.
>>
>> 73!
>>
>>
>>
>>
>>
>> Patrick WD9EWK/VA7EWK
>> http://www.wd9ewk.net/
>> Twitter: @xxxxxx or http://twitter.com/WD9EWK
>>
>>
>>
>>> On Thursday, December 14, 2017, Mac A. Cody <maccody@xxx.xxx> wrote:
>>>
>>> Patrick,
>>>
>>> If, as you stated, SSTV has run its course, maybe Experimenter's
>>> Wednesdays on AO-85 could be changed to experiment with EMCOMM using
>>> NBEMS, thereby keeping AO-91 as free as possible. Once that has
>>> run its course, then move on to another experiment. That would
>>> keep things fresh. I think a report on each experiment would be an
>>> interesting series of articles in the AMSAT Journal. I think
>>> continuous experimentation is a good thing!
>>>
>>> Mac Cody - AE5PH
>>
>> _______________________________________________
>> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
>> to all interested persons worldwide without requiring membership.
Opinions expressed
>> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 2
Date: Fri, 15 Dec 2017 14:32:23 +0000 (UTC)
From: Roland Zurmely <py4zbz@xxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Images received from ATHENOXAT-1
Message-ID: <579097935.284846.1513348343697@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Incons and jpeg thumbnails received from new Athenoxat-1?beacon :
<http://www.qsl.net/py4zbz/athenoxat.htm#f>
73 de Roland PY4ZBZ
------------------------------
Message: 3
Date: Fri, 15 Dec 2017 13:33:49 -0100
From: Pedro Dutra Sousa <pedro@xxxxxxxxxx.xxxx>
To: jim@xxxxxx.xx
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Wouxun KG-UV8D
Message-ID: <4519769F-2F69-4354-82AA-3FFF7792E011@xxxxxxxxxx.xxxx>
Content-Type: text/plain; charset=utf-8
Hi,
Wouxun has a software for that, I think.
I have one 9D and one 9DPlus and the software is different because of the
extra menus on the Plus model not being compatible.
I haven?t programmed the AO-91 frequencies yet, planning to do so this
weekend, but I only use them for scanning. Being a full duplex radio I
always use memories as a cheat card and switch to VFO. I can send you te KG
file later on.
73 Pedro CU2ZG
Sent from my iPhone
Please excuse any typos or briefness
> On 14 Dec 2017, at 22:56, jim@xxxxxx.xx wrote:
>
>
>
>
> Does anyone use the Wouxun RG-UV8D handie for any sats? If so would you
mind sharing your program (.KG) file? Thanks!
> 73's
> Jim
> WA5QAP
> _______________________________________________
> 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
>
> --
> This message has been scanned for viruses and
> dangerous content by MailScanner, and is
> believed to be clean.
>
--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
------------------------------
Message: 4
Date: Fri, 15 Dec 2017 14:37:21 +0000
From: David Johnson <dave@xxxxx.xx.xx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] FUNcube Warehouse Outage
Message-ID: <1567EF2A-0495-4A98-B4DE-D3E86519C208@xxxxx.xx.xx>
Content-Type: text/plain; charset=us-ascii
Hi,
Sorry if you experienced a short outage of the display pages, we were fixing
up a problem with the channel MinMax values.
73
- Dave
------------------------------
Message: 5
Date: Fri, 15 Dec 2017 08:40:39 -0600
From: "JoAnne K9JKM" <joanne.k9jkm@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] A suggestion for Experimenter's Wednesdays on
AO-91
Message-ID: <5a33dee6.0f616b0a.126d0.6242@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="utf-8"
EMike mentioned:
> It seems to me that the limiting factor for using LEO satellites as an
> Emergency Response of any scale, would the short amount of time of a given
> pass and the limited number of usable passes a day over an area needing the
> response.
I agree, a verbal status report or request for assistance for an island-wide
or city-wide disaster (think Puerto Rico and Houston) likely would not fit
into the time for a LEO pass of a single satellite.
But, us ingenious ham radio operator types perhaps have the basis of sending
compressed data which conveys a lot of information. Packed into the bytes of
telemetry messages we find out about voltage, current, solar cells,
temperature, etc. We use a predefined interface document to decode the
string of bytes.
How about using a predefined disaster status data stream that all shelters
(like scattered around an entire island) to encode 1) head count of staff 2)
head count of victims 3) electrical power 4)drinking water 5) more supplies
needed 6) need critical assistance. This way EOC staff could develop and
maintain a system-wide status. Coordinating supplies or critical messages
may also need better paths to complete than 10 minutes of satellite time.
We fill data warehouses with telemetry bytes as ground stations around the
world receive those defined telemetry streams and forward them. Conversely,
if multiple LEO satellites support a disaster-status protocol then EOC staff
could receive more frequent updates (having to tune and track a different
satellite though). In this case the EOC uses multiple satellites vs. one
data warehouse with multiple users.
We'd need future cubesat missions capable of supporting a disaster telemetry
stream. If we try something like this now it likely could see proof of
concept with a single cubesat.
Hoping someday we'll replace this cubesat approach with the AMSAT Phase 4
groundstation. That will be like having a wireless phone line between an EOC
and every shelter.
--
73 de JoAnne K9JKM
k9jkm@xxxxx.xxx
------------------------------
Message: 6
Date: Fri, 15 Dec 2017 09:50:26 -0500
From: "E.Mike McCardel" <mccardelm@xxxxx.xxx>
To: JoAnne K9JKM <joanne.k9jkm@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] A suggestion for Experimenter's Wednesdays on
AO-91
Message-ID: <68A44267-1232-4AA9-B20A-5A59B3DD86DA@xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Maybe a question for engineering, but, can the cross band FM receivers
aboard the LEO repeat SSTV and APRS? I think they don?t care if it?s voice
or whatever.
EMike
EMike McCardel, AA8EM
Rotating Editor AMSAT News Service
Sent from my iPhone
> On Dec 15, 2017, at 9:40 AM, JoAnne K9JKM <joanne.k9jkm@xxxxx.xxx> wrote:
>
> EMike mentioned:
>
>> It seems to me that the limiting factor for using LEO satellites as an
>> Emergency Response of any scale, would the short amount of time of a given
>> pass and the limited number of usable passes a day over an area needing the
>> response.
>
>
> I agree, a verbal status report or request for assistance for an
island-wide or city-wide disaster (think Puerto Rico and Houston) likely
would not fit into the time for a LEO pass of a single satellite.
>
> But, us ingenious ham radio operator types perhaps have the basis of
sending compressed data which conveys a lot of information. Packed into the
bytes of telemetry messages we find out about voltage, current, solar cells,
temperature, etc. We use a predefined interface document to decode the
string of bytes.
>
> How about using a predefined disaster status data stream that all shelters
(like scattered around an entire island) to encode 1) head count of staff 2)
head count of victims 3) electrical power 4)drinking water 5) more supplies
needed 6) need critical assistance. This way EOC staff could develop and
maintain a system-wide status. Coordinating supplies or critical messages
may also need better paths to complete than 10 minutes of satellite time.
>
> We fill data warehouses with telemetry bytes as ground stations around the
world receive those defined telemetry streams and forward them. Conversely,
if multiple LEO satellites support a disaster-status protocol then EOC staff
could receive more frequent updates (having to tune and track a different
satellite though). In this case the EOC uses multiple satellites vs. one
data warehouse with multiple users.
>
> We'd need future cubesat missions capable of supporting a disaster
telemetry stream. If we try something like this now it likely could see
proof of concept with a single cubesat.
>
> Hoping someday we'll replace this cubesat approach with the AMSAT Phase 4
groundstation. That will be like having a wireless phone line between an EOC
and every shelter.
>
> --
> 73 de JoAnne K9JKM
> k9jkm@xxxxx.xxx
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
expressed
> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 7
Date: Fri, 15 Dec 2017 09:50:42 -0500
From: Robert Bruninga <bruninga@xxxx.xxx>
To: "E.Mike McCardel" <mccardelm@xxxxx.xxx>, "Mac A. Cody"
<maccody@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] A suggestion for Experimenter's Wednesdays on
(PSAT?)
Message-ID: <b9d9707ab915c80a358c3671970c62f7@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset="UTF-8"
An Experiment I would like to see done is experimental DATA and RTTY modes
on PSAT's PSK31 Linear transponder. I rarely hear anyone using PSK31 and so
it is quite available. It has a linear receiver for any modulation going up
on 28.120 MHz and then the demodulated audio comes down on FM on UHF 435.350
MHz.
But the uplink is SHARED with terrestrial RTTY and DATA modes (though very
rarely are there signals there)...
The only catch is that there does need to be at least one PSK31 signal in
the passband to cause the transponder to come up. But once up, it is a
clean bent pipe for all the rest of the 3 KHz bandwidth.
I read Part 97.307(f)4 and 309(a) as saying any digital mode that is less
than 1 Khz FSK or under 1200 baud symbol rate can be used?
One other catch. (my fault)... It Recycles every 20 seconds. Which means
the carrier will drop for a few seconds as the processor is reset and then
it waits for the 31 Hz detect to come up again. So time your exchanges in
the 20 second repeating windows...
Bob
-----Original Message-----
From: AMSAT-BB [ On Behalf Of E.Mike McCardel
Subject: Re: [amsat-bb] A suggestion for Experimenter's Wednesdays on AO-91
It seems to me that the limiting factor for using LEO satellites as an
Emergency Response of any scale, would the short amount of time of a given
pass and the limited number of usable passes a day over an area needing the
response. I?m not sure experimentation would find ways around this
limitation. But of course experimentation is just that.
Perhaps we need to get out of the box for how Experimenter?s Wednesdays
work. What modes can we adapt? Can we incorporate an educational initiative,
similar to ISS school contacts? Remote control APRS messaging as Mark
Spencer demonstrated with MAREA? I know these seem like we are limiting
contacts to just a few people, but they can reach hundreds of students and
introduce satellite and radio enthusiasm to another generation of school
children and millennial.
73
EMike
EMike McCardel, AA8EM
Rotating Editor AMSAT News Service
Sent from my iPhone
> On Dec 15, 2017, at 1:26 AM, Mac A. Cody <maccody@xxx.xxx> wrote:
> I'm embarrassed to say that I've never done anything personally with
> NBEMS. What I knowabout it isfrom a presentation at my radio club.
> We have had a group that was experimenting with NBEMS on the club
> repeater. Don't know whether they are still doing it, though. They
> weren't using any special interface between radios and computers -
> speaker output to microphone input in both directions. I'd like to
> try NBEMS on the FM birds simply as a way of experimenting with using LEO
> birds for emergency response.
>
> As you mentioned, there is a lot of sites out there describing how to
> use NBEMS using Fldigi/Flmsg. I have not seen anything specific, yet,
> regarding to using NBEMS over a satellite. I'm sure that there are
> attendant challenges and opportunities doing so.
> Doppler shift and signal quality will be the main challenges. MT65
> appears to be the modulation scheme of choice. Full duplex operation
> would be helpful, as you could monitor your own signal to verify its
> quality and how well the message got through.
>
> I'll have to investigate further.
>
> Mac Cody - AE5PH
>
>> On 12/14/2017 11:38 PM, Scott wrote:
>> I've always been curious about NBEMS as well, Mac.
>>
>> There is a fair amount of info on the subject online, but could you point
>> me to any particular orientation how-to that might be geared to someone
>> using it in a more informal setting such as how we might use it via an FM
>> satellite?
>>
>> -Scott, K4KDR
========================
>> -----Original Message----- From: Patrick STODDARD (WD9EWK/VA7EWK)
>> Sent: Friday, December 15, 2017 12:29 AM
>> Subject: Re: [amsat-bb] Experimenter's Wednesdays on >> AO-91
>>
>> Now that's a good idea. Otherwise, Wednesdays on AO-85 could be
>> called SSTV Wednesdays, if that's the extent of "Experimenter's
>> Wednesdays" for that satellite. I would be inclined to try NBEMS,
>> something I've never used.
>>
>> Patrick WD9EWK/VA7EWK
>>> On Thursday, December 14, 2017, Mac A. Cody <maccody@xxx.xxx> wrote:
>>>
>>> If, as you stated, SSTV has run its course, maybe Experimenter's
>>> Wednesdays on AO-85 could be changed to experiment with EMCOMM using
>>> NBEMS, thereby keeping AO-91 as free as possible. Once that has run
>>> its course, then move on to another experiment. That would keep
>>> things fresh. I think a report on each experiment would be an
>>> interesting series of articles in the AMSAT Journal. I think
>>> continuous experimentation is a good thing!
>>>
>>> Mac Cody - AE5PH
------------------------------
Message: 8
Date: Fri, 15 Dec 2017 08:55:18 -0600
From: Jeff Johns <jeff30339@xxxxx.xxx>
To: Amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] A suggestion for Experimenter's Wednesdays on
AO-91
Message-ID:
<CA+QOuE4gdgTU2+zGwQTYmKL6UuhZyAELsfdjiSbedqPjAFps3w@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset="UTF-8"
Yes, AO-85 has been transmitting SSTV every Wednesday for quite some time
now.
Jeff WE4B
On Friday, December 15, 2017, E.Mike McCardel <mccardelm@xxxxx.xxx> wrote:
> Maybe a question for engineering, but, can the cross band FM receivers
> aboard the LEO repeat SSTV and APRS? I think they don?t care if it?s voice
> or whatever.
>
> EMike
>
> EMike McCardel, AA8EM
> Rotating Editor AMSAT News Service
> Sent from my iPhone
>
> > On Dec 15, 2017, at 9:40 AM, JoAnne K9JKM <joanne.k9jkm@xxxxx.xxx>
> wrote:
> >
> > EMike mentioned:
> >
> >> It seems to me that the limiting factor for using LEO satellites as an
> >> Emergency Response of any scale, would the short amount of time of a
> given
> >> pass and the limited number of usable passes a day over an area needing
> the
> >> response.
> >
> >
> > I agree, a verbal status report or request for assistance for an
> island-wide or city-wide disaster (think Puerto Rico and Houston) likely
> would not fit into the time for a LEO pass of a single satellite.
> >
> > But, us ingenious ham radio operator types perhaps have the basis of
> sending compressed data which conveys a lot of information. Packed into the
> bytes of telemetry messages we find out about voltage, current, solar
> cells, temperature, etc. We use a predefined interface document to decode
> the string of bytes.
> >
> > How about using a predefined disaster status data stream that all
> shelters (like scattered around an entire island) to encode 1) head count
> of staff 2) head count of victims 3) electrical power 4)drinking water 5)
> more supplies needed 6) need critical assistance. This way EOC staff could
> develop and maintain a system-wide status. Coordinating supplies or
> critical messages may also need better paths to complete than 10 minutes of
> satellite time.
> >
> > We fill data warehouses with telemetry bytes as ground stations around
> the world receive those defined telemetry streams and forward them.
> Conversely, if multiple LEO satellites support a disaster-status protocol
> then EOC staff could receive more frequent updates (having to tune and
> track a different satellite though). In this case the EOC uses multiple
> satellites vs. one data warehouse with multiple users.
> >
> > We'd need future cubesat missions capable of supporting a disaster
> telemetry stream. If we try something like this now it likely could see
> proof of concept with a single cubesat.
> >
> > Hoping someday we'll replace this cubesat approach with the AMSAT Phase
> 4 groundstation. That will be like having a wireless phone line between an
> EOC and every shelter.
> >
> > --
> > 73 de JoAnne K9JKM
> > k9jkm@xxxxx.xxx
> >
> >
> >
> > _______________________________________________
> > Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> > to all interested persons worldwide without requiring membership.
> Opinions expressed
> > are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> 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: 9
Date: Fri, 15 Dec 2017 10:03:01 -0500
From: Robert Bruninga <bruninga@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] A suggestion for ... Emergency Comms - APRS...
Message-ID: <97d27fce1eac7ac3c79269af0a7838a7@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset="UTF-8"
Such a highly compressed method of satellite encoding exists called APRS.
>> ... the limiting factor for using LEO satellites as an Emergency
>> Response of any scale, would the short amount of time of a
>> given pass and the limited number of usable passes a day...
> But, us ingenious ham radio operator types perhaps have the basis
> of sending compressed data which conveys a lot of information.
> Packed into the bytes of telemetry messages ...
> How about a predefined disaster status data stream that all shelters...
Use the APRS Object for a SHELTER. Just one packet can contain the
position, time and date of the report, and up to 47 bytes of useful info
such as 1) head count of staff 2) head count of victims 3) electrical
power 4)drinking water 5) more supplies needed 6) need critical
assistance.
> Conversely, if multiple LEO satellites support a disaster-status
protocol..
They do. APRS is currently on 3 sateliltes... PSAT, ISS and PCSAT and
soon to be QIKCOM2 and PSAT2 and BRICSAT2... And TJHS hicghschool cubesat,
etc
> We'd need future cubesat missions capable of supporting a disaster
telemetry stream.
We have it. See the SATT4 single card APRS transponder. We invite every
school or university that is contemplating a CUBESAT to consider using
this transponder for their command and control which also provides the
APRS transponder as well. Cost is under $300 or so.
See http://aprs.org/satt4.html
Bob, WB4aPR
------------------------------
Message: 10
Date: Fri, 15 Dec 2017 09:28:31 -0600
From: "Mac A. Cody" <maccody@xxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] A suggestion for Experimenter's Wednesdays on
AO-91
Message-ID: <69b798c6-ebd8-5cf5-f2e2-96af4ed49da9@xxx.xxx>
Content-Type: text/plain; charset=utf-8; format=flowed
JoAnne and EMike,
That is why I suggested as an experiment the use of NBEMS in my original
post:
"The messages could be sent digitally via, say, Narrow Band Emergency
Messaging System (NBEMS) to improve reliability of transcription."
Yes, voice would be slow and inaccurate.? Using digital data would send more
information quicker.? NBEMS can be use send various ICS forms, weather
reports,
and ARRL Radiograms.? The data streams you suggest are already supported
through NBEMS.? ? NBEMS is designed precisely for this type of application.
NBEMS can work on SSB as well as FM modes.? Given that there are already a
sizable number of amateur satellites orbiting the earth, and more
coming, there
would be many opportunities to pass traffic over LEO satellites. The
transponder
birds would offer multiple channels for this activity.? I'm sure,
though, that there
will be those that shudder over the thought of multiple data streams
being passed
over the linear birds at one time.?? Data transmissions would have to be
disciplined.
73,
Mac AE5PH
On 12/15/2017 08:40 AM, JoAnne K9JKM wrote:
> EMike mentioned:
>
>> It seems to me that the limiting factor for using LEO satellites as an
>> Emergency Response of any scale, would the short amount of time of a given
>> pass and the limited number of usable passes a day over an area needing the
>> response.
>
> I agree, a verbal status report or request for assistance for an
island-wide or city-wide disaster (think Puerto Rico and Houston) likely
would not fit into the time for a LEO pass of a single satellite.
>
> But, us ingenious ham radio operator types perhaps have the basis of
sending compressed data which conveys a lot of information. Packed into the
bytes of telemetry messages we find out about voltage, current, solar cells,
temperature, etc. We use a predefined interface document to decode the
string of bytes.
>
> How about using a predefined disaster status data stream that all shelters
(like scattered around an entire island) to encode 1) head count of staff 2)
head count of victims 3) electrical power 4)drinking water 5) more supplies
needed 6) need critical assistance. This way EOC staff could develop and
maintain a system-wide status. Coordinating supplies or critical messages
may also need better paths to complete than 10 minutes of satellite time.
>
> We fill data warehouses with telemetry bytes as ground stations around the
world receive those defined telemetry streams and forward them. Conversely,
if multiple LEO satellites support a disaster-status protocol then EOC staff
could receive more frequent updates (having to tune and track a different
satellite though). In this case the EOC uses multiple satellites vs. one
data warehouse with multiple users.
>
> We'd need future cubesat missions capable of supporting a disaster
telemetry stream. If we try something like this now it likely could see
proof of concept with a single cubesat.
>
> Hoping someday we'll replace this cubesat approach with the AMSAT Phase 4
groundstation. That will be like having a wireless phone line between an EOC
and every shelter.
>
> --
> 73 de JoAnne K9JKM
> k9jkm@xxxxx.xxx
>
>
>
> _______________________________________________
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AMSAT-NA.
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Subject: Digest Footer
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Sent via amsat-bb@xxxxx.xxx.
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Not an AMSAT member? Join now to support the amateur satellite program!
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End of AMSAT-BB Digest, Vol 12, Issue 340
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