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CX2SA > SATDIG 03.04.17 01:24l 971 Lines 35117 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: Amsat live Oscar satellite status page (Paul Stoetzer)
2. AO73 Mode change (Graham Shirville)
3. Community Survey Request -- crosslinks, multi-hop packet, and
satellite DX (Zach Leffke)
4. Re: Community Survey Request -- crosslinks, multi-hop packet,
and satellite DX (Zach Leffke)
5. Re: Community Survey Request -- crosslinks, multi-hop packet,
and satellite DX (John Brier)
6. Re: satpc error (Bob- W7LRD)
7. Re: Community Survey Request -- crosslinks, multi-hop packet,
and satellite DX (Zach Leffke)
8. Re: Alert! AO-40 is working again! (jim@xxxxxx.xxx
9. VUCC Awards/Endorsements for March 2017 (John Papay)
10. Re: Community Survey Request -- crosslinks, multi-hop packet,
and satellite DX (KO6TZ Bob)
11. Re: Community Survey Request -- crosslinks, multi-hop packet,
and satellite DX (Stefan Wagener)
----------------------------------------------------------------------
Message: 1
Date: Sun, 2 Apr 2017 14:30:03 -0400
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: "Bill Bordy, NJ1H" <nj1h@xxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>, jeffory broughton
<jefforybroughton@xxxxx.xxx>
Subject: Re: [amsat-bb] Amsat live Oscar satellite status page
Message-ID:
<CABzOSOrPz_X+jWcxcJ4NzxUTptQsDKF4GS1TYrHPH1DpCJuW3A@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
The person in charge of maintaining the status page is aware of the
problem. Hopefully it can be fixed shortly!
73,
Paul, N8HM
On Sun, Apr 2, 2017 at 2:26 PM, Bill Bordy, NJ1H <nj1h@xxxxxxx.xxx> wrote:
> It is broke. I think a clue is at the bottom of the page:
>
> *Reports From:*
>
> *';ALERT('XSS');
>
> *Hovering over the reports also shows nothing. Running Firefox 52.0.2 (32
> bit) here.
>
> 73,
> Bill
> NJ1H*
> *
>
> On 4/2/2017 2:07 PM, jeffory broughton wrote:
>
>> Is it not working today ? I can't enter anything.thanks.
>>
>> jeff broughton
>> _______________________________________________
>> 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: Sun, 2 Apr 2017 20:25:53 +0100
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
To: "AMSAT BB" <amsat-bb@xxxxx.xxx>
Cc: funcube@xxxxxxxxxxx.xx.xx
Subject: [amsat-bb] AO73 Mode change
Message-ID: <78800A31175E45DE86493A51FA9E1115@xxxxxxx.xxxxx>
Content-Type: text/plain; format=flowed; charset="UTF-8";
reply-type=response
Hi folks,
FUNcube/AO73 is now in autonomous mode for the week.
Please see below for all FUNcube mission info
73s Graham G3VZV and the FUNcube team.
++++++++++++++++++++++++++++++++++
FUNcube frequencies and other details
++++++++++++++++++++++++++++++++++
AO-73 FUNcube-1
The transponder is normally operational only when the satellite is in
eclipse, ie the solar panels are NOT being illuminated. During weekends
(from pm Fridays UTC to PM Sundays UTC) the transponder is operational 24/7.
When the transponder is switched off, the telemetry beacon is on full power,
when the transponder is on the beacon it is on low power. During holidays,
eg Christmas, New Year, Easter, etc, the transponder maybe activated for
extended periods. Watch AMSAT-BB for announcements which are usually made on
Friday evenings (UTC)
The nominal transponder frequencies are:
Uplink: 435.150 - 435.130 MHz LSB (Inverting)
Downlink: 145.950 - 145.970 MHz USB
Telemetry Tx: 145.935 MHz BPSK
(The passband may be up to 15kHz higher depending on on-board temps. Lower
temperatures give higher freqs!)
FUNcube-2 (aka FUNcube on UKube)
The FUNcube-2 sub-system continues to operate autonomously and, almost
continuously, in amateur mode. The transponder is operational and the
telemetry downlink is functioning with about 70mW output. The FUNcube-1
Dashboard does not correctly display the telemetry but it does correctly
decode the data and uploads it to the FUNcube Data Warehouse from where it
can be examined. Most of the real time data channels are operational and
these include battery voltages, temperatures and ADCS data coming via the
main On Board Computer (OBC).
The transponder is interrupted for a few seconds every 2 minutes when the
other transmitter sends its CW beacon and, occasionally, for a few seconds
when the main OBC reboots (approx seven times each orbit).
The nominal transponder frequencies are:
Uplink: 435.080 - 435.060 MHz LSB (Inverting)
Downlink: 145.930 - 145.950 MHz USB
Telemetry Tx: 145.915 MHz BPSK
(The passband may be up to 10kHz higher depending on on-board temps. Low
temperatures give higher freqs!)
EO79 FUNcube-3
Due to power budget constraints the transponder cannot be operational 24/7
and an orbit specific schedule has been developed. The transponder will
commence operation 27 minutes after the spacecraft enters sunlight and will
stay on for a period of 25 minutes. This schedule may be modified in future
months as a result of experience.
The nominal transponder frequencies are:
Uplink: 435.0723-435.0473 MHz LSB (Inverting)
Downlink: 145.946-145.971 MHz USB
Further detailed info on EO79 transponder frequencies is at:
https://amsat-uk.org/2016/11/10/eo79-funcube-3-transponder-commences-regular-o
peration/
EO88/Nayif-1/FUNcube-5
EO88 is presently operating in autonomous mode. The transponder is
operational when the satellite is in eclipse, ie the solar panels are NOT
being illuminated.
When the transponder is switched off, the telemetry beacon is on full power,
when the transponder is on the beacon it is on low power.
The transponder frequencies are:
Uplink: 435.045 ? 435.015 MHz LSB (inverting)
Downlink: 145.960-145.990 MHz USB
Telemetry Tx: 145.940MHz
All FUNcube transponders are sponsored by AMSAT-UK and AMSAT-NL. We are very
grateful for the assistance given by Innovative Solution In Space Bv, The
Netherlands.
_______________________________________________
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, 2 Apr 2017 16:26:54 -0400
From: Zach Leffke <zleffke@xx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Community Survey Request -- crosslinks, multi-hop
packet, and satellite DX
Message-ID: <df5cc4cc-9abb-8cc6-6c7f-30b7518094af@xx.xxx>
Content-Type: text/plain; charset=utf-8; format=flowed
Hello fellow satellite nuts!
This email is to humbly request the opinions of those in the Amateur
Satellite Community about the idea of setting new satellite DX records.
Nothing formal, you can email on list or off list as you think appropriate.
So here is the idea: What if there were a constellation of three
satellites (3 1Us), built by students (undergrads) at three different
universities, but launched together and deployed from the same deployer
that had crosslink packet communications built into the design. Then,
what if those birds were licensed via the Amateur Radio route (instead
of Experimental as is the norm for most University birds, with some
notable exceptions of course) allowing the entire global amateur
satellite community to use the crosslink capability in an attempt to set
new satellite DX records?
Now, there is a primary science mission (pseudo-range determination as
the constellation separates, different mass and drag profiles for each
bird) so during the work week, science happens, but on the weekends, the
constellation is made available to the community for crosslink packet
comms. Additionally, if your setup has enough G/T to monitor the lower
power crosslink comms, and with a little bit of technical tweaking to
your ground station (you would need GPS based PPS to measure propagation
time, maybe ~$100 invested), you could participate in Space to Earth
pseudo-range measurements that would contribute to a secondary orbit
determination goal. To be clear, the up and down linking for the
satellite DX attempts would be standard FSK9600, AX.25, so as long as
your station can do that, you can use the crosslink path for multi-hop
comms. Its only the S-to-E pseudo range measurement that would require
a bit of additional HW.
Does this sound interesting? Would you as an operator be interested in
multi-hop satellite packet comms? Do you think this type of operating
schedule is acceptable (weekends) to justify Amateur Radio licensing
instead of Experimental? Would you be interested in contributing to the
science mission (S-to-E pseudo-range measurement)? Would you track the
telemetry downlinks and forward that data on to the mission data warehouse?
Any and all opinions, good or bad, are welcome. Again, on or off list
as you see appropriate is fine with me. My goal with this is to get a
sense of what the community's opinion on this topic is and if the
constellation were available for use, how much interest there would be
in this type of operation.
Thanks in Advance!
Sincerely,
Zach, KJ4QLP
--
Research Associate
Aerospace Systems Lab
Ted & Karyn Hume Center for National Security & Technology
Virginia Polytechnic Institute & State University
Work Phone: 540-231-4174
Cell Phone: 540-808-6305
------------------------------
Message: 4
Date: Sun, 2 Apr 2017 16:31:36 -0400
From: Zach Leffke <zleffke@xx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Community Survey Request -- crosslinks,
multi-hop packet, and satellite DX
Message-ID: <f0bf2be7-3652-3cea-4d32-0508f83d3c86@xx.xxx>
Content-Type: text/plain; charset=windows-1252; format=flowed
one clarification point.. all opinions are good, and I'm interested in
them.
I meant all opinions, whether positive ('Hey that's cool, I'd play') or
negative ('stupid idea, will never work') related to the concept of
operations, are welcome.
-Zach, KJ4QLP
Research Associate
Aerospace Systems Lab
Ted & Karyn Hume Center for National Security & Technology
Virginia Polytechnic Institute & State University
Work Phone: 540-231-4174
Cell Phone: 540-808-6305
On 4/2/2017 4:26 PM, Zach Leffke wrote:
> Hello fellow satellite nuts!
>
> This email is to humbly request the opinions of those in the Amateur
> Satellite Community about the idea of setting new satellite DX
> records. Nothing formal, you can email on list or off list as you
> think appropriate.
>
> So here is the idea: What if there were a constellation of three
> satellites (3 1Us), built by students (undergrads) at three different
> universities, but launched together and deployed from the same
> deployer that had crosslink packet communications built into the
> design. Then, what if those birds were licensed via the Amateur Radio
> route (instead of Experimental as is the norm for most University
> birds, with some notable exceptions of course) allowing the entire
> global amateur satellite community to use the crosslink capability in
> an attempt to set new satellite DX records?
>
> Now, there is a primary science mission (pseudo-range determination as
> the constellation separates, different mass and drag profiles for each
> bird) so during the work week, science happens, but on the weekends,
> the constellation is made available to the community for crosslink
> packet comms. Additionally, if your setup has enough G/T to monitor
> the lower power crosslink comms, and with a little bit of technical
> tweaking to your ground station (you would need GPS based PPS to
> measure propagation time, maybe ~$100 invested), you could participate
> in Space to Earth pseudo-range measurements that would contribute to a
> secondary orbit determination goal. To be clear, the up and down
> linking for the satellite DX attempts would be standard FSK9600,
> AX.25, so as long as your station can do that, you can use the
> crosslink path for multi-hop comms. Its only the S-to-E pseudo range
> measurement that would require a bit of additional HW.
>
>
> Does this sound interesting? Would you as an operator be interested
> in multi-hop satellite packet comms? Do you think this type of
> operating schedule is acceptable (weekends) to justify Amateur Radio
> licensing instead of Experimental? Would you be interested in
> contributing to the science mission (S-to-E pseudo-range
> measurement)? Would you track the telemetry downlinks and forward
> that data on to the mission data warehouse?
>
>
> Any and all opinions, good or bad, are welcome. Again, on or off list
> as you see appropriate is fine with me. My goal with this is to get a
> sense of what the community's opinion on this topic is and if the
> constellation were available for use, how much interest there would be
> in this type of operation.
>
>
> Thanks in Advance!
>
>
> Sincerely,
>
> Zach, KJ4QLP
>
>
------------------------------
Message: 5
Date: Sun, 2 Apr 2017 16:42:30 -0400
From: John Brier <johnbrier@xxxxx.xxx>
To: Zach Leffke <zleffke@xx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Community Survey Request -- crosslinks,
multi-hop packet, and satellite DX
Message-ID:
<CALn0fKOumf3rQbgBACF6E2UgJVhqAnoskD5YUf0Pom2pyVOtkw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Would it/could it/should it use the standard APRS mode on 145.825 MHz
with ARISS path to take advantage of the ISS and PSAT digipeaters?
That could allow for longer/more robust sat DX opportunities. If it
were like the existing digipeaters that use APRS it would be easy for
me to use with my Kenwood TH-D72 but if it required specially
configured computer software that would be harder for me to use as I
only have a portable sat setup now.
73, John Brier KG4AKV
On Sun, Apr 2, 2017 at 4:31 PM, Zach Leffke <zleffke@xx.xxx> wrote:
> one clarification point.. all opinions are good, and I'm interested in them.
>
> I meant all opinions, whether positive ('Hey that's cool, I'd play') or
> negative ('stupid idea, will never work') related to the concept of
> operations, are welcome.
>
>
> -Zach, KJ4QLP
>
> Research Associate
> Aerospace Systems Lab
> Ted & Karyn Hume Center for National Security & Technology
> Virginia Polytechnic Institute & State University
> Work Phone: 540-231-4174
> Cell Phone: 540-808-6305
>
> On 4/2/2017 4:26 PM, Zach Leffke wrote:
>>
>> Hello fellow satellite nuts!
>>
>> This email is to humbly request the opinions of those in the Amateur
>> Satellite Community about the idea of setting new satellite DX records.
>> Nothing formal, you can email on list or off list as you think appropriate.
>>
>> So here is the idea: What if there were a constellation of three
>> satellites (3 1Us), built by students (undergrads) at three different
>> universities, but launched together and deployed from the same deployer
that
>> had crosslink packet communications built into the design. Then, what if
>> those birds were licensed via the Amateur Radio route (instead of
>> Experimental as is the norm for most University birds, with some notable
>> exceptions of course) allowing the entire global amateur satellite
community
>> to use the crosslink capability in an attempt to set new satellite DX
>> records?
>>
>> Now, there is a primary science mission (pseudo-range determination as the
>> constellation separates, different mass and drag profiles for each bird) so
>> during the work week, science happens, but on the weekends, the
>> constellation is made available to the community for crosslink packet
comms.
>> Additionally, if your setup has enough G/T to monitor the lower power
>> crosslink comms, and with a little bit of technical tweaking to your ground
>> station (you would need GPS based PPS to measure propagation time, maybe
>> ~$100 invested), you could participate in Space to Earth pseudo-range
>> measurements that would contribute to a secondary orbit determination goal.
>> To be clear, the up and down linking for the satellite DX attempts would be
>> standard FSK9600, AX.25, so as long as your station can do that, you can
use
>> the crosslink path for multi-hop comms. Its only the S-to-E pseudo range
>> measurement that would require a bit of additional HW.
>>
>>
>> Does this sound interesting? Would you as an operator be interested in
>> multi-hop satellite packet comms? Do you think this type of operating
>> schedule is acceptable (weekends) to justify Amateur Radio licensing
instead
>> of Experimental? Would you be interested in contributing to the science
>> mission (S-to-E pseudo-range measurement)? Would you track the telemetry
>> downlinks and forward that data on to the mission data warehouse?
>>
>>
>> Any and all opinions, good or bad, are welcome. Again, on or off list as
>> you see appropriate is fine with me. My goal with this is to get a sense
of
>> what the community's opinion on this topic is and if the constellation were
>> available for use, how much interest there would be in this type of
>> operation.
>>
>>
>> Thanks in Advance!
>>
>>
>> Sincerely,
>>
>> 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: 6
Date: Sun, 2 Apr 2017 21:00:05 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] satpc error
Message-ID:
<2077287650.150297150.1491166805208.JavaMail.zimbra@xxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
FIXED
speakers were not plugged in the back of the computer.
I go back in my corner now.
73 Bob W7LRD
----- Original Message -----
From: "Bob- W7LRD" <w7lrd@xxxxxxx.xxx>
To: "amsat-bb" <amsat-bb@xxxxx.xxx>
Sent: Sunday, April 2, 2017 10:58:02 AM
Subject: [amsat-bb] satpc error
should have added win 10 computer
On startup I get
OLE-fehler 8004503A class ID:
A55849567-FF07-419C-BACD-9931 F1256D92
What do I have going on?? program does not connect to radio, turns antennas,
not reading doppler sqf files
from the digitally challenged
73 Bob W7LRD
_______________________________________________
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, 2 Apr 2017 17:29:51 -0400
From: Zach Leffke <zleffke@xx.xxx>
To: John Brier <johnbrier@xxxxx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Community Survey Request -- crosslinks,
multi-hop packet, and satellite DX
Message-ID: <6d2fb273-be33-a626-7d79-02775fc263f8@xx.xxx>
Content-Type: text/plain; charset=utf-8; format=flowed
still working out details, so I can't give concrete answers. But here
is the spirit of the idea to try to answer your question (specifically
about packet crosslink comms, not the S-E range measurements):
One decision that has been made is the Astrodev Lithium radio on UHF
frequencies (radios have been bought). Single UHF frequency per bird
for uplinking and downlinking on (half duplex). A second common/shared
UHF freq for the crosslink. FSK9600/AX.25 UI for all up and down links
(I'm 99% sure the Lithium can't do AFSK1200, but still investigating,
and if anyone on the list has experience with the Lithium I'm all
ears). Crosslink radio is the RFM69HCW, which is similar to MO-76's
RFM22 radio, also on UHF freqs.
So a definitely frequency incompatibility with existing APRS fleet.
Other than the frequency incompatibility though, when switched into
'weekend ops' mode, it would likely be standard FSK9600 up and down,
AX.25 UI Frame, and APRS 'encoded' packets from/to the ground. The
crosslink is a more custom link that would be 'transparent' to the
operator. It is still FSK9600, but not AX.25 (based on RFM69HCW chips
capabilities). The students are currently playing with prototypes to
work out the specifics for the crosslink data format. Its easier to use
the built in 'packet mode' on the chips, but more flexible (and harder)
to use the 'transparent mode.' We're currently examining both options.
So FSK9600/AX.25 UI/APRS encoded up, data decoded and updated per APRS
digipeat standards, APRS message encapsulated for transport across the
RFM69 crosslink, then APRS message updated again at the next satellite,
then downlinked in FSK9600/AX.25 UI/APRS format. The original receiving
bird will possibly also digipeat on the Lithium radio as well as sending
to the crosslink radio to 'confirm' reception of the uplink, since the
crosslink will be different freq, different protocol, still TBD though.
so 3 freqs (one up, one across, one down), probably two protocols (one
for up/down, one for across).
As far as software/hardware goes on the ground, standard TNCs capable of
9600 baud comms should work, much like the current operating mode for
ARISS packet. So D700s/710s for sure should be able to play, as well as
any radio with a 9600 baud data jack (and standard AX.25 TNC) should
also work. Any APRS software driving the TNC should work as well. My
hope is that any 'special software' that might ride on top of that would
be available on github for the interested user (likely derived from the
open source Fox Dashboard currently out there, but again, undergrad
student project here).
For those interested in the S-to-E measurements, with enough G/T, some
recommended HW would need to be obtained (according to a 'User Guide,'
still to be written, but basically some cheap parts from
Adafruit/Sparkfun) and the same Dashboard mentioned above would have the
relevant code to use that HW and obtain the data and forward on to our
servers.
Hope that helps clarify the CONOP.
-Zach, KJ4QLP
Research Associate
Aerospace Systems Lab
Ted & Karyn Hume Center for National Security & Technology
Virginia Polytechnic Institute & State University
Work Phone: 540-231-4174
Cell Phone: 540-808-6305
On 4/2/2017 4:42 PM, John Brier wrote:
> Would it/could it/should it use the standard APRS mode on 145.825 MHz
> with ARISS path to take advantage of the ISS and PSAT digipeaters?
> That could allow for longer/more robust sat DX opportunities. If it
> were like the existing digipeaters that use APRS it would be easy for
> me to use with my Kenwood TH-D72 but if it required specially
> configured computer software that would be harder for me to use as I
> only have a portable sat setup now.
>
> 73, John Brier KG4AKV
>
> On Sun, Apr 2, 2017 at 4:31 PM, Zach Leffke <zleffke@xx.xxx> wrote:
>> one clarification point.. all opinions are good, and I'm interested in
them.
>>
>> I meant all opinions, whether positive ('Hey that's cool, I'd play') or
>> negative ('stupid idea, will never work') related to the concept of
>> operations, are welcome.
>>
>>
>> -Zach, KJ4QLP
>>
>> Research Associate
>> Aerospace Systems Lab
>> Ted & Karyn Hume Center for National Security & Technology
>> Virginia Polytechnic Institute & State University
>> Work Phone: 540-231-4174
>> Cell Phone: 540-808-6305
>>
>> On 4/2/2017 4:26 PM, Zach Leffke wrote:
>>> Hello fellow satellite nuts!
>>>
>>> This email is to humbly request the opinions of those in the Amateur
>>> Satellite Community about the idea of setting new satellite DX records.
>>> Nothing formal, you can email on list or off list as you think
appropriate.
>>>
>>> So here is the idea: What if there were a constellation of three
>>> satellites (3 1Us), built by students (undergrads) at three different
>>> universities, but launched together and deployed from the same deployer
that
>>> had crosslink packet communications built into the design. Then, what if
>>> those birds were licensed via the Amateur Radio route (instead of
>>> Experimental as is the norm for most University birds, with some notable
>>> exceptions of course) allowing the entire global amateur satellite
community
>>> to use the crosslink capability in an attempt to set new satellite DX
>>> records?
>>>
>>> Now, there is a primary science mission (pseudo-range determination as the
>>> constellation separates, different mass and drag profiles for each bird)
so
>>> during the work week, science happens, but on the weekends, the
>>> constellation is made available to the community for crosslink packet
comms.
>>> Additionally, if your setup has enough G/T to monitor the lower power
>>> crosslink comms, and with a little bit of technical tweaking to your
ground
>>> station (you would need GPS based PPS to measure propagation time, maybe
>>> ~$100 invested), you could participate in Space to Earth pseudo-range
>>> measurements that would contribute to a secondary orbit determination
goal.
>>> To be clear, the up and down linking for the satellite DX attempts would
be
>>> standard FSK9600, AX.25, so as long as your station can do that, you can
use
>>> the crosslink path for multi-hop comms. Its only the S-to-E pseudo range
>>> measurement that would require a bit of additional HW.
>>>
>>>
>>> Does this sound interesting? Would you as an operator be interested in
>>> multi-hop satellite packet comms? Do you think this type of operating
>>> schedule is acceptable (weekends) to justify Amateur Radio licensing
instead
>>> of Experimental? Would you be interested in contributing to the science
>>> mission (S-to-E pseudo-range measurement)? Would you track the telemetry
>>> downlinks and forward that data on to the mission data warehouse?
>>>
>>>
>>> Any and all opinions, good or bad, are welcome. Again, on or off list as
>>> you see appropriate is fine with me. My goal with this is to get a
sense of
>>> what the community's opinion on this topic is and if the constellation
were
>>> available for use, how much interest there would be in this type of
>>> operation.
>>>
>>>
>>> Thanks in Advance!
>>>
>>>
>>> Sincerely,
>>>
>>> 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: 8
Date: Sun, 2 Apr 2017 18:20:07 -0400
From: jim@xxxxxx.xx
To: "Jim Walls" <jim@xxxxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Alert! AO-40 is working again!
Message-ID:
<38761b8d0db41e309c3b6e9dd651e8c7.squirrel@xxxxxxxxx.xxxxxxxx.xxx>
Content-Type: text/plain; charset="utf-8"
NOT FUNNY AT ALL !!!!!!!!!!!!!!!!!!!!
---------------------------- Original Message ----------------------------
Subject: Re: [amsat-bb] Alert! AO-40 is working again!
From: "Jim Walls" <jim@xxxxx.xxx>
Date: Sat, April 1, 2017 3:29 pm
To: amsat-bb@xxxxx.xxx
--------------------------------------------------------------------------
> On 4/1/2017 09:27, Vince Fiscus, KB7ADL wrote:
>>
>> April Fools.
>
> I saw the subject and my heart paused, and then I remembered the date!
>
> --
> 73
> -------------------------------------
> Jim Walls - K6CCC
> jim@xxxxx.xxx
> Ofc: 818-548-4804
> http://members.dslextreme.com/users/k6ccc/
> AMSAT Member 32537 - WSWSS Member 395
>
>
> _______________________________________________
> 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: Sun, 02 Apr 2017 18:09:27 -0400
From: John Papay <john@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] VUCC Awards/Endorsements for March 2017
Message-ID: <20170402224051.AE4968AF5@xxxxxxxxxx.xxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Here are the endorsements and new VUCC Satellite
Awards issued by the ARRL for the period March 1, 2017
through March 30, 2017. There was no update on March 31st.
Congratulations to all those who made the list this month!
CALL GRIDS
KO4MA 1510
W5PFG 990
N8HM 862
NP4JV 552
N6UK 372
KK4FEM 327
K5ND 225
AI6GS 175
NS3L 175
NJ7H 125
VE7CEW 103 (New VUCC)
This list was developed by comparing the ARRL .pdf
listings for March 1st and March 30th. It's a visual
comparison so omissions are possible. Apologies if your
call was not mentioned. Thanks to all those who are
roving to grids that are rarely on the birds. They are
doing most of the work!
73,
John K8YSE
---
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------------------------------
Message: 10
Date: Sun, 2 Apr 2017 15:54:54 -0700
From: KO6TZ Bob <my.callsign@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Community Survey Request -- crosslinks,
multi-hop packet, and satellite DX
Message-ID: <4bec9860-a552-72a0-eb2f-438939a3b7eb@xxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8; format=flowed
Zach,
I like what I see so far on your initial proposal.
In the past, I have been involved with 2-HOP and 3-HOP packet attempts
using various combinations of the ISS, NO-44 and NO-84 when they were
all working on 145.825MHz.
Your proposal of using a 9K6 FSK 2-port_digi's on board three satellites
in the same orbital track resolves what I believe to be the main
challenges we faced in our 1200 baud experiment. If the footprints
overlap, the satellites should be able to talk to each other.
1) Since the satellites were in different orbits, there was Doppler
shift in the signal between them. In your proposal, doppler is minimal
for FM packet.
2) With your 2-port digi, the repeated packets between satellites will
not be interfered with by multiple up link signals. Improving the
success rate.
3) I find that 9K6_FSK is as easy to copy as 1200baud, so efficiency in
channel usage is gained.
Once the operators acquire confidence in establishing basic 2 & 3 Hop
packet contacts, the other experiments and distance records you
mentioned will follow.
I'm in.....
BOB
KO6TZ
------------------------------
Message: 11
Date: Sun, 2 Apr 2017 18:12:37 -0500
From: Stefan Wagener <wageners@xxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>, KO6TC@xxxxxxx.xxx
Subject: Re: [amsat-bb] Community Survey Request -- crosslinks,
multi-hop packet, and satellite DX
Message-ID:
<CAKu8kHB__0qcd+tMvPx1pq97YUwwjMqmLc_rfdG-G0hGQiAquA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
A few quick thoughts:
1. Is the "long distance record" truly an academic goal? I hope that this
is just a side effect of a more scientific endeavour :-)
2. How will the deployment of the satellites being scheduled? Too close
together means long time for separation to make it useful but longer
lifetime for use. Too much initially separation and the satellites won't
see each other for too long.
3. How about the deployment altitude. The higher the better?
4. What happens to the sat in the middle, just a link between the other
ones and no direct contact/use?
5. How can the system be programmed that if one satellites fails it still
works?
6. Why 1Us and not bigger for better power budget and redundancies?
Have fun,
73, Stefan VE4NSA
On Sun, Apr 2, 2017 at 5:54 PM, KO6TZ Bob <my.callsign@xxxxxxx.xxx> wrote:
> Zach,
>
> I like what I see so far on your initial proposal.
>
> In the past, I have been involved with 2-HOP and 3-HOP packet attempts
> using various combinations of the ISS, NO-44 and NO-84 when they were all
> working on 145.825MHz.
>
> Your proposal of using a 9K6 FSK 2-port_digi's on board three satellites
> in the same orbital track resolves what I believe to be the main challenges
> we faced in our 1200 baud experiment. If the footprints overlap, the
> satellites should be able to talk to each other.
>
> 1) Since the satellites were in different orbits, there was Doppler shift
> in the signal between them. In your proposal, doppler is minimal for FM
> packet.
>
> 2) With your 2-port digi, the repeated packets between satellites will
> not be interfered with by multiple up link signals. Improving the success
> rate.
>
> 3) I find that 9K6_FSK is as easy to copy as 1200baud, so efficiency in
> channel usage is gained.
>
> Once the operators acquire confidence in establishing basic 2 & 3 Hop
> packet contacts, the other experiments and distance records you mentioned
> will follow.
>
> I'm in.....
>
> BOB
> KO6TZ
>
> _______________________________________________
> 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
>
------------------------------
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
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 12, Issue 88
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