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CX2SA > SATDIG 16.04.18 02:58l 994 Lines 36103 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. WD9EWK TNX for first L/v mode contact (CEE)
2. Re: Antenna switching (John)
3. Re: Making the transponder sats as easy as the fm birds
(Eric Fort)
4. Re: Antenna switching (FG8OJ)
5. Re: AO73/FUNcube-1 Operations (Jim Heck)
6. RES: AO73/FUNcube-1 Operations (Paulo PV8DX)
7. Re: WD9EWK TNX for first L/v mode contact
(Patrick STODDARD (WD9EWK/VA7EWK))
8. Re: Making the transponder sats as easy as the fm birds (Greg D)
9. Salado TX ARISS pass April 17 streaming video coverage
(Ronald G. Parsons)
10. Upcoming ARISS contact with Central Islip Union Free School
District, Central Islip, NY (n4csitwo@?????????.????
----------------------------------------------------------------------
Message: 1
Date: Sat, 14 Apr 2018 22:33:50 -0700
From: CEE <cee@????????????.???>
To: AMSAT-BB@?????.???
Subject: [amsat-bb] WD9EWK TNX for first L/v mode contact
Message-ID: <f23b146a-5f2f-45a8-ae85-854ae37dd49e@????????????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Patrick, thanks for being there for my first L/v mode contact on AO-92.
I have been working on the uplink setup for some time. I will also try
to help populate this mode whenever I can.
Thanks again!
73 - Chuck N7BFO
------------------------------
Message: 2
Date: Sun, 15 Apr 2018 08:53:17 +0100
From: "John" <john@?????.???.??>
To: "'Rolf Krogstad'" <rolf.krogstad@?????.???>,
"'<AMSAT-BB@?????.???>'" <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Antenna switching
Message-ID: <000701d3d48e$d1319b10$7394d130$@?????.???.??>
Content-Type: text/plain; charset="us-ascii"
Hi Rolf et al,
My solution to this problem (or at least a very similar question) was to fit
a sub-rx tap to my FT-847 - one of the HupRF PAT-V boards to be exact.
They are now being sold by sdr-kits I think, and involve about ten solder
joints being made at the most. The result, for me certainly, wqs that I have
a dedicated "SDR Port" on the back of my rig, presented as an SMA, and a
short bridge lead from the rig to the Funcube Pro+. I don't know which rig
you use, but it might be worth looking down this route?
73, and a firm left handshake,
John (XLX)
-----Original Message-----
From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Rolf Krogstad
Sent: 14 April 2018 22:18
To: <AMSAT-BB@?????.???> <amsat-bb@?????.???>
Subject: [amsat-bb] Antenna switching
In the shack I am finally starting to use my Funcube Dongle Pro Plus with
SDR-Console 3 and really am liking the combo, especially for the linear
birds.
The one downside is having to manually unscrew coax connectors to swap the
antennas from receiver to transmitter and vice versa when going from V/U to
U/V and U/V to V/U.
I don't want to use multiple antenna switches because if I or a guest op
doesn't set them properly I could blow the front end of the receiver.
Does anyone have an idiot-proof solution for throwing one switch and having
the two antennas swapped between rcvr and xmtr?
Tnx es 73
Rolf NR0T
EN34it
_______________________________________________
Sent via AMSAT-BB@?????.???. 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: Sat, 14 Apr 2018 17:22:16 -0700
From: Eric Fort <eric.fort.listmail@??????????????.???>
To: Greg D <ko6th.greg@?????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] Making the transponder sats as easy as the fm
birds
Message-ID: <C3FEE39A-EEAA-4769-8E4E-BB92E53F20F1@??????????????.???>
Content-Type: text/plain; charset=utf-8
Yes, a zero hertz tone would be ideal if one were going to insert a tone for
tracking. Not sure you?d need full carrier though. The advantage of a zero
hertz tone is not having to notch it on rx, a ctcss tone is probably easier
to generate on modern transceivers though. Having a (reduced) ?carrier? to
measure and track would seem to be an aid to automated tuning of the
receiver though. Sound card listens for the tone and adjusts rx frequency
according to the offset from a known and agreed upon transmit tone. What I?m
hearing here in the comments though and I?ll ask if this is correct.... is
that the computational approach of adjustment based upon published elements
is good enough. Can and does the computer frequency control get us close
enough for hands off operating when both stations us it?
Also if computer control and tracking is ?good enough? why is it not almost
universal on the transponder sats? For the cost of a Raspberry pi or
similar sbc and the proper ci-v / cat cable you have computer control of
frequency. As cheap as this is compared to the cost of an all mode radio
why is it not more often put to use?
If computer control is not good enough for hands free operation, how can we
make it so?
Af6ep
Sent using SMTP.
> On Apr 13, 2018, at 10:23 PM, Greg D <ko6th.greg@?????.???> wrote:
>
> "subaudible" is only sub audible when you're dead on frequency if you're
> using SSB. For FM, where we are familiar with the technique, that's
> fine. But instead of a tone, you'd perhaps be better off running Single
> Sideband AM (i.e. a sub audible tone of zero hertz); there was a
> satellite recently that was in that sort of mode (I forget which bird),
> and it was really interesting to work.
>
> BUT, one huge problem with sending up a "beacon tone" for aligning
> stations to, is that you're sending a 100% duty cycle carrier (though
> perhaps reduced power) to a transponder that really hates having 100%
> carriers run through it. That's one of the big reasons why they don't
> allow FM on the SSB / CW birds (the other being the extra bandwidth that
> it takes).
>
> Bottom line is that, yes, one can construct methods to aid in frequency
> tracking. But One True Rule software-assisted operation works really
> well already, for those who can use it, and can be backed all the way
> down to manual for those who can't. And, manual operation of an SSB
> station through a satellite is quite an interesting exercise. I often
> find it more satisfying than having to deal with starting up and fussing
> with all the computer automation "help". Just takes a bit of practice.
>
> Greg KO6TH
>
>
> Eric Fort wrote:
>> Computer control or actually a variation of such *IS* what I?m
considering and proposing. Yes I have read ?the one true way?. I understand
this manual tweaking is how it?s currently done. Why however are we
adjusting only one frequency? It seems that we can adjust the transmit
frequency so that it is always the same distance from the beacon as seen by
the satellite and the receiver can automatically track the subduable tone
transmitted. This means that you need not drift across the transponder and
the rx station automatically tracks. What am I missing in this being hands
off and always on frequency?
>>
>> AF6EP
>>
>> Sent using SMTP.
>>
>>> On Apr 13, 2018, at 7:49 PM, Andy <w5acm@??????.???> wrote:
>>>
>>> So VERY true!
>>> Thanks Bruce,
>>> ANDY w5acm
>>>
>>>
>>> -----Original Message-----
>>> From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of Bruce
>>> Sent: Friday, April 13, 2018 9:40 PM
>>> To: amsat-bb@?????.???
>>> Subject: Re: [amsat-bb] Making the transponder sats as easy as the fm
birds
>>>
>>> Sorry, this theory of thought is incorrect. You must adjust the higher
of the two frequencies as it is most affected by Doppler. The true way to
adjust is really to adjust both frequencies, however in the absence of
computer control of both frequencies, you adjust the higher. Thus, if it is
the receive frequency, then you adjust the receive, if it is the transmit,
then you adjust the transmit. Holding the transmit frequency on the wrong
band will cause you to walk across all the other QSO's taking place which is
not a good practice.
>>>
>>> 73...bruce
>>>
>>>> On 4/13/2018 8:41 PM, Eric Fort wrote:
>>>> I?ve had an idea for a long time as to making the satellites with
linear transponders as easy to use as the FM ?easy sats ?. Consider the
following:
>>>>
>>>> As I understand it, the goal is to adjust your transmitter such that
your frequency at the satellite is constant.
>>>>
>>>> Our tracking program gives us range to the satellite and its velocity
relative to us given our location and the orbital parameters. From this we
should have computed Doppler for both transmit and receive.
>>>>
>>>> We also know the frequency at the satellite of the various beacons
>>>> onboard. From this we can measure the doppler and work the other
>>>> direction
>>>>
>>>> If we transmit a subaudable tone of known frequency we should be able
>>>> to adjust the rx automatically by tracking the tone. (Acssb)
>>>>
>>>> Given these multiple ways of setting our tx/rx frequencies for our
location can this not simply be automated to such a degree as to simply
specify an offset from the beacon and operate as if it were a regular
predictable opening on hf?
>>>>
>>>> Af6ep
>>>>
>>>> Sent using SMTP.
>>>> _______________________________________________
>>>> Sent via AMSAT-BB@?????.???. 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
>>>
>>> --
>>>
>>> Bruce Paige, KK5DO
>>>
>>> AMSAT Director Contests and Awards
>>> AMSAT Board Member 2016-2018
>>>
>>> ARRL Awards Field Checker (WAS, 5BWAS, VUCC), VE
>>>
>>> Houston AMSAT Net - Wed 0100z on Echolink - Conference *AMSAT* Also live
streaming MP3 at http://www.amsatnet.com Podcast at
http://www.amsatnet.com/podcast.xml or iTunes
>>>
>>> Latest satellite news on the ARRL Audio News http://www.arrl.org
>>>
>>> AMSAT on Twitter http://www.twitter.com/amsat
>>>
>>>
>>> _______________________________________________
>>> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available to
all interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
>>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>>>
>>> _______________________________________________
>>> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
>>> to all interested persons worldwide without requiring membership.
Opinions expressed
>>> are solely those of the author, and do not reflect the official views of
AMSAT-NA.
>>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>> _______________________________________________
>> Sent via AMSAT-BB@?????.???. AMSAT-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, 15 Apr 2018 14:13:02 +0000
From: FG8OJ <info@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Antenna switching
Message-ID: <a363d7ad-afb0-0289-a0f9-4b14b8e59b76@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Hello Rolf and everybody,
I am using a transfer switch to change mode J to B for my SDR and FT817
here at station.
The model I use is ARD62024M01 but some other can be used. They can be
sold for less than $10. You will need a 24V DC source for switching for
the 24 model. 12 V model may be harder to found.
https://www.ebay.com/itm/26GHz-Transfer-Switch-SMA-28V-NAIS/282918010462?hash=
item41df3a3e5e:g:hq8AAOSwJWFajFK7
73, Burt FG8OJ
> -----Original Message-----
> From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Rolf Krogstad
> Sent: 14 April 2018 22:18
> To: <AMSAT-BB@?????.???> <amsat-bb@?????.???>
> Subject: [amsat-bb] Antenna switching
>
> In the shack I am finally starting to use my Funcube Dongle Pro Plus with
> SDR-Console 3 and really am liking the combo, especially for the linear
> birds.
>
> The one downside is having to manually unscrew coax connectors to swap the
> antennas from receiver to transmitter and vice versa when going from V/U to
> U/V and U/V to V/U.
>
> I don't want to use multiple antenna switches because if I or a guest op
> doesn't set them properly I could blow the front end of the receiver.
>
> Does anyone have an idiot-proof solution for throwing one switch and having
> the two antennas swapped between rcvr and xmtr?
>
> Tnx es 73
> Rolf NR0T
> EN34it
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available to all
> interested persons worldwide without requiring membership. Opinions
> expressed are solely those of the author, and do not reflect the official
> views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. AMSAT-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, 15 Apr 2018 19:28:10 +0100
From: "Jim Heck" <jim@??????.??.???>
To: "AMSAT" <amsat-bb@?????.???>, <funcube@???????????.??.??>
Subject: Re: [amsat-bb] AO73/FUNcube-1 Operations
Message-ID: <0267F088F7AA4634965C3743CA00CCC4@??????>
Content-Type: text/plain; format=flowed; charset="UTF-8";
reply-type=response
Hi Folks,
Further to my message below, we have reviewed our intentions for next
week. We have had a couple of requests for the transponder to be active for
World Amateur Radio Day on Wed 18 April, and so will be leaving the
transponder active full time throughout next week. So next switch to
autonomous mode will be next weekend (Sun GMT)
73s
Jim G3WGM
and the FUNcube team.
-----Original Message-----
From: Jim Heck
Sent: Friday, April 13, 2018 7:16 PM
To: AMSAT ; funcube@???????????.??.??
Subject: AO73/FUNcube-1 Operations
Hi All,
The transponder has just been switched to continuous transponder operation.
Will revert to continuous auto switching mode on Sun pm or Mon am UTC.
morning.
Have fun
73
Jim G3WGM
------------------------------
Message: 6
Date: Sun, 15 Apr 2018 16:04:58 -0400
From: "Paulo PV8DX" <paulopv8dx@?????.???>
To: "'Jim Heck'" <jim@??????.??.???>, "'AMSAT'" <amsat-bb@?????.???>,
<funcube@???????????.??.??>
Subject: [amsat-bb] RES: AO73/FUNcube-1 Operations
Message-ID: <004201d3d4f5$0ae82b60$20b88220$@?????.???>
Content-Type: text/plain; charset="us-ascii"
Hi Jim
Thanks for your attention.
Thank FUNcube Team.
http://www.labre-rr.org/18april2018.html
http://www.iaru.org/world-amateur-radio-day.html
73 de Paulo PV8DX
-----Mensagem original-----
De: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? Em nome de Jim Heck
Enviada em: domingo, 15 de abril de 2018 14:28
Para: AMSAT; funcube@???????????.??.??
Assunto: Re: [amsat-bb] AO73/FUNcube-1 Operations
Hi Folks,
Further to my message below, we have reviewed our intentions for next
week. We have had a couple of requests for the transponder to be active for
World Amateur Radio Day on Wed 18 April, and so will be leaving the
transponder active full time throughout next week. So next switch to
autonomous mode will be next weekend (Sun GMT)
73s
Jim G3WGM
and the FUNcube team.
-----Original Message-----
From: Jim Heck
Sent: Friday, April 13, 2018 7:16 PM
To: AMSAT ; funcube@???????????.??.??
Subject: AO73/FUNcube-1 Operations
Hi All,
The transponder has just been switched to continuous transponder operation.
Will revert to continuous auto switching mode on Sun pm or Mon am UTC.
morning.
Have fun
73
Jim G3WGM
_______________________________________________
Sent via AMSAT-BB@?????.???. 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, 15 Apr 2018 20:25:46 +0000
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@??????.???>
To: cee@????????????.???? AMSAT <amsat-bb@?????.???>
Subject: Re: [amsat-bb] WD9EWK TNX for first L/v mode contact
Message-ID:
<CAN6TEUcm3aj=3zwGLjva9vdd1tDdsO+3mB4ahfvKKVDFddXPOQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Chuck,
Thanks for the nice, if slightly disjointed, chat last night on
AO-92. Aligning my antenna and uplink tuning is always fun with
the L-band uplink, especially with only 1W transmitter power
from my DJ-G7T HT. I had stopped at a highway rest area about
50 miles north of Phoenix, on my way home from a day out in
eastern Arizona working from the DM54/DM55 grid boundary. I
missed the western AO-92 pass this morning, but hopefully we
can do that again on other times L/V is on.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
Twitter: @?????? or http://twitter.com/WD9EWK
On Sun, Apr 15, 2018 at 5:33 AM, CEE <cee@????????????.???> wrote:
> Patrick, thanks for being there for my first L/v mode contact on AO-92. I
> have been working on the uplink setup for some time. I will also try to
> help populate this mode whenever I can.
>
> Thanks again!
>
> 73 - Chuck N7BFO
>
>
------------------------------
Message: 8
Date: Sun, 15 Apr 2018 16:14:49 -0700
From: Greg D <ko6th.greg@?????.???>
To: Eric Fort <eric.fort.listmail@??????????????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] Making the transponder sats as easy as the fm
birds
Message-ID: <1e165803-0f5b-5bd0-008a-695aae438546@?????.???>
Content-Type: text/plain; charset=utf-8
You are correct that a full power carrier is not needed, but still the
whole exercise, while interesting to contemplate, is unnecessary for the
task at hand. My opinion is that computer control is plenty good
enough. Even full manual control is good enough in the hands of an
experienced operator. Neither method is going to be as easy as chatting
on simplex or the local repeater "out of the box";, nor do I think they
need to be. Both require some knowledge, learning (which is different
than book knowledge), and practice. That learning is a big part of what
the hobby is all about.
Then it will be easy. It took me weeks of work and elmering to make my
first satellite contact, and a lot of that success was due to the skill
of the operator on the other end (Mel, KW7E). That was on RS-10, which
was considered the ultimate "Easy Sat". The second contact took a lot
less time, and pretty soon I could fire up the rigs, find myself, and be
in business in seconds, all on a lash-up of equipment that I can only
smile at today.
There is certainly a place for automation. Those repeater contacts we
have all made are aided by the rig's automatic offset shift on
transmit. That makes sense, as it ties in with the band plan, repeater
construction standards, physics of narrow bandwidth filtering, etc. We
have no such structure on the transponder satellites, nor for a linear
transponder do we really need one. In the future the communications
channel will be much more complex in the services that it supplies, so
yes, there will be automation there too. But for simple transponders,
there is no need for complex handling techniques.
And, don't forget Engineer Scott's observation, or perhaps it was a
warning: "The more they overthink the plumbing, the easier it is to
stop up the drain."
Oscar-7 still works.
Greg KO6TH
Eric Fort wrote:
> Yes, a zero hertz tone would be ideal if one were going to insert a tone
for tracking. Not sure you?d need full carrier though. The advantage of a
zero hertz tone is not having to notch it on rx, a ctcss tone is probably
easier to generate on modern transceivers though. Having a (reduced)
?carrier? to measure and track would seem to be an aid to automated tuning
of the receiver though. Sound card listens for the tone and adjusts rx
frequency according to the offset from a known and agreed upon transmit
tone. What I?m hearing here in the comments though and I?ll ask if this is
correct.... is that the computational approach of adjustment based upon
published elements is good enough. Can and does the computer frequency
control get us close enough for hands off operating when both stations us it?
>
> Also if computer control and tracking is ?good enough? why is it not
almost universal on the transponder sats? For the cost of a Raspberry pi or
similar sbc and the proper ci-v / cat cable you have computer control of
frequency. As cheap as this is compared to the cost of an all mode radio
why is it not more often put to use?
>
> If computer control is not good enough for hands free operation, how can
we make it so?
>
> Af6ep
>
> Sent using SMTP.
>
>> On Apr 13, 2018, at 10:23 PM, Greg D <ko6th.greg@?????.???> wrote:
>>
>> "subaudible" is only sub audible when you're dead on frequency if you're
>> using SSB. For FM, where we are familiar with the technique, that's
>> fine. But instead of a tone, you'd perhaps be better off running Single
>> Sideband AM (i.e. a sub audible tone of zero hertz); there was a
>> satellite recently that was in that sort of mode (I forget which bird),
>> and it was really interesting to work.
>>
>> BUT, one huge problem with sending up a "beacon tone" for aligning
>> stations to, is that you're sending a 100% duty cycle carrier (though
>> perhaps reduced power) to a transponder that really hates having 100%
>> carriers run through it. That's one of the big reasons why they don't
>> allow FM on the SSB / CW birds (the other being the extra bandwidth that
>> it takes).
>>
>> Bottom line is that, yes, one can construct methods to aid in frequency
>> tracking. But One True Rule software-assisted operation works really
>> well already, for those who can use it, and can be backed all the way
>> down to manual for those who can't. And, manual operation of an SSB
>> station through a satellite is quite an interesting exercise. I often
>> find it more satisfying than having to deal with starting up and fussing
>> with all the computer automation "help". Just takes a bit of practice.
>>
>> Greg KO6TH
>>
>>
>> Eric Fort wrote:
>>> Computer control or actually a variation of such *IS* what I?m
considering and proposing. Yes I have read ?the one true way?. I understand
this manual tweaking is how it?s currently done. Why however are we
adjusting only one frequency? It seems that we can adjust the transmit
frequency so that it is always the same distance from the beacon as seen by
the satellite and the receiver can automatically track the subduable tone
transmitted. This means that you need not drift across the transponder and
the rx station automatically tracks. What am I missing in this being hands
off and always on frequency?
>>>
>>> AF6EP
>>>
>>> Sent using SMTP.
>>>
>>>> On Apr 13, 2018, at 7:49 PM, Andy <w5acm@??????.???> wrote:
>>>>
>>>> So VERY true!
>>>> Thanks Bruce,
>>>> ANDY w5acm
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of Bruce
>>>> Sent: Friday, April 13, 2018 9:40 PM
>>>> To: amsat-bb@?????.???
>>>> Subject: Re: [amsat-bb] Making the transponder sats as easy as the fm
birds
>>>>
>>>> Sorry, this theory of thought is incorrect. You must adjust the higher
of the two frequencies as it is most affected by Doppler. The true way to
adjust is really to adjust both frequencies, however in the absence of
computer control of both frequencies, you adjust the higher. Thus, if it is
the receive frequency, then you adjust the receive, if it is the transmit,
then you adjust the transmit. Holding the transmit frequency on the wrong
band will cause you to walk across all the other QSO's taking place which is
not a good practice.
>>>>
>>>> 73...bruce
>>>>
>>>>> On 4/13/2018 8:41 PM, Eric Fort wrote:
>>>>> I?ve had an idea for a long time as to making the satellites with
linear transponders as easy to use as the FM ?easy sats ?. Consider the
following:
>>>>>
>>>>> As I understand it, the goal is to adjust your transmitter such that
your frequency at the satellite is constant.
>>>>>
>>>>> Our tracking program gives us range to the satellite and its velocity
relative to us given our location and the orbital parameters. From this we
should have computed Doppler for both transmit and receive.
>>>>>
>>>>> We also know the frequency at the satellite of the various beacons
>>>>> onboard. From this we can measure the doppler and work the other
>>>>> direction
>>>>>
>>>>> If we transmit a subaudable tone of known frequency we should be able
>>>>> to adjust the rx automatically by tracking the tone. (Acssb)
>>>>>
>>>>> Given these multiple ways of setting our tx/rx frequencies for our
location can this not simply be automated to such a degree as to simply
specify an offset from the beacon and operate as if it were a regular
predictable opening on hf?
>>>>>
>>>>> Af6ep
>>>>>
>>>>> Sent using SMTP.
>>>>> _______________________________________________
>>>>> Sent via AMSAT-BB@?????.???. 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
>>>> --
>>>>
>>>> Bruce Paige, KK5DO
>>>>
>>>> AMSAT Director Contests and Awards
>>>> AMSAT Board Member 2016-2018
>>>>
>>>> ARRL Awards Field Checker (WAS, 5BWAS, VUCC), VE
>>>>
>>>> Houston AMSAT Net - Wed 0100z on Echolink - Conference *AMSAT* Also
live streaming MP3 at http://www.amsatnet.com Podcast at
http://www.amsatnet.com/podcast.xml or iTunes
>>>>
>>>> Latest satellite news on the ARRL Audio News http://www.arrl.org
>>>>
>>>> AMSAT on Twitter http://www.twitter.com/amsat
>>>>
>>>>
>>>> _______________________________________________
>>>> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
>>>> Not an AMSAT-NA member? Join now to support the amateur satellite
program!
>>>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>>>>
>>>> _______________________________________________
>>>> Sent via AMSAT-BB@?????.???. AMSAT-NA makes this open forum available
>>>> to all interested persons worldwide without requiring membership.
Opinions expressed
>>>> are solely those of the author, and do not reflect the official views
of AMSAT-NA.
>>>> Not an AMSAT-NA member? Join now to support the amateur satellite
program!
>>>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>>> _______________________________________________
>>> Sent via AMSAT-BB@?????.???. AMSAT-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, 15 Apr 2018 18:18:17 -0500
From: "Ronald G. Parsons" <w5rkn@?????.???>
To: "AMSAT-BB" <AMSAT-BB@?????.???>
Subject: [amsat-bb] Salado TX ARISS pass April 17 streaming video
coverage
Message-ID: <7ADC296F006244C5BD0875475953A5A3@?????????>
Content-Type: text/plain; charset="utf-8"
An International Space Station school contact has been planned with
participants at Salado Intermediate School, Salado, TX on 17 Apr. The event
is scheduled to begin at approximately 16:44 UTC. The duration of the
contact is approximately 9 minutes and 30 seconds. The contact will be
direct between NA1SS and K5LBJ. The contact should be audible over the state
of Texas and adjacent areas. Interested parties are invited to listen in on
the 145.80 MHz downlink. The contact is expected to be conducted in English.
Streaming video should be available at:
TV Station Website Link Location on Website
KWTX-10 (CBS) http://www.kwtx.com/ Top center - ?Watch Live?
KCEN-6 (NBC) http://www.kcentv.com/ Top right - ?Watch Live?
KXXV-25 (ABC) http://www.kxxv.com/ Top right ? ?Watch Now?
(Ron Parsons W5RKN)
------------------------------
Message: 10
Date: Sun, 15 Apr 2018 20:39:44 -0400
From: <n4csitwo@?????????.???>
To: "Bill Merino" <n2cop@??.??.???>, <amsat-bb@?????.???>, "amsat-edu"
<amsat-edu@?????.???>, <ariss-press@?????.???>
Subject: [amsat-bb] Upcoming ARISS contact with Central Islip Union
Free School District, Central Islip, NY
Message-ID: <E6E82BE16FCF4536AE8841A3F9620550@???>
Content-Type: text/plain; charset="iso-8859-1"
An International Space Station school contact has been planned with
participants at Central Islip Union Free School District, Central Islip, NY
on 18 Apr. The event is scheduled to begin at approximately 15:57 UTC. The
duration of the contact is approximately 9 minutes and 30 seconds. The
contact will be direct between NA1SS and KD2IFR. The contact should be
audible over the state of New York and adjacent areas. Interested parties
are invited to listen in on the 145.80 MHz downlink. The contact is expected
to be conducted in English.
Welcome to the Central Islip Union Free School District - Home of the
Musketeers and a proud Suffolk County, New York school system, where
approximately 8,000 students in grades Pre-Kindergarten through 12 receive
their formal education. Our School District's motto is Children Our Future
~ Diversity Our Strength. The Central Islip Union Free School District is
comprised of eight schools: one district-wide early childhood center, four
elementary schools, two middle schools and a high school.
The Hamlet of Central Islip is a vibrant, culturally-diverse community. A
suburban community with urban demographics. We are a positive and
progressive school district whose teachers are dedicated to helping students
achieve their maximum potential and to develop academically and socially.
Our district offers an array of afterschool activities including sports,
music, theatre arts and much more.
Participants will ask as many of the following questions as time allows:
1. What are the challenges of spending so many months constantly around the
same people?
2. What is the best way to describe the feeling of zero gravity?
3. Have you experienced anything unexpected while in space that could not be
explained?
4. Have you experienced any significant changes, either physically or
emotionally, since being in space?
5. What type of robots do you use on the ISS and how are they helpful?
6. What is your advice for young people who want to become involved in
programs at NASA?
7. What is the biggest challenge about being on a long duration space
mission?
8. How does digestion in microgravity compare to digestion on Earth?
9. Have you experienced anything in space that has made you change your
perspective on life?
10. Are there any plants aboard the ISS and if so, what's different about how
they meet their daily requirements?
11. What are the long term effects of reduced leg muscle use in long duration
space travel?
12. Is your circadian rhythm affected by multiple sunrises and sunsets each
24 hour period, perhaps making it difficult to sleep for long periods of
time?
13. Can you describe the types of training that prepared you for this
mission?
14. Can you catch a cold on the Space Station?
15. Do the properties of light appear to be different in space?
16. Are there differences in how your body responds to physical exertion
while in microgravity?
17. Would it be possible to transmit a mechanical wave on a rope onboard the
space station or outside the station?
18. What are the hardest tasks to perform in space that are routine on Earth?
19. Could you blow a bigger than normal gum bubble in space?
20. Are there precautions that you take BEFORE going into space that can help
to prevent bone weakness when you return?
PLEASE CHECK THE FOLLOWING FOR MORE INFORMATION ON ARISS UPDATES:
Visit ARISS on Facebook. We can be found at Amateur Radio on the
International Space Station (ARISS).
To receive our Twitter updates, follow @????????????
Next planned event(s):
1. King's High School, Warwick, UK, direct via GB4KHS
The ISS callsign is presently scheduled to be OR4ISS
The scheduled astronaut is Ricky Arnold KE5DAU
Contact is a go for: Thu 2018-04-19 12:05 UTC
2. Russian school TBD
The ISS callsign is presently scheduled to be RS?ISS
The scheduled astronaut is Alexander Skvortsov
Contact is a go for Tue 2018-04-24 11:05 UTC
3. Russian school TBD
The ISS callsign is presently scheduled to be RS?ISS
The scheduled astronaut is Alexander Skvortsov
Contact is a go for 2018-04-25 08:35 UTC
About ARISS:
Amateur Radio on the International Space Station (ARISS) is a cooperative
venture of international amateur radio societies and the space agencies that
support the International Space Station (ISS). In the United States,
sponsors are the Radio Amateur Satellite Corporation (AMSAT), the American
Radio Relay League (ARRL), the Center for the Advancement of Science in
Space (CASIS) and National Aeronautics and Space Administration (NASA).
The primary goal of ARISS is to promote exploration of science, technology,
engineering, and mathematics (STEM) topics by organizing scheduled contacts
via amateur radio between crew members aboard the ISS and students in
classrooms or informal education venues. With the help of experienced
amateur radio volunteers, ISS crews speak directly with large audiences in a
variety of public forums. Before and during these radio contacts, students,
teachers, parents, and communities learn about space, space technologies,
and amateur radio. For more informa
tion, see www.ariss.org, www.amsat.org, and www.arrl.org.
Thank you & 73,
David - AA4KN
---
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------------------------------
Subject: Digest Footer
_______________________________________________
Sent via amsat-bb@?????.???.
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 13, Issue 137
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