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CX2SA > SATDIG 14.05.20 21:32l 630 Lines 23671 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: L band gear (Zach Metzinger)
2. Re: Relayed sked request (David J. Schmocker)
3. Re: L band gear (Greg D)
4. Re: L band gear (Zach Metzinger)
5. Re: Huskysat in safe mode (Burns Fisher)
6. Re: L band gear (Leffke, Zachary)
7. Two way SSTV exchanges using PSAT2 (Robert Bruninga)
8. Re: L band gear (EDWARD KROME)
9. Re: L band gear (EDWARD KROME)
10. Re: L band gear (Zach Metzinger)
11. Re: L band gear (Greg D)
----------------------------------------------------------------------
Message: 1
Date: Thu, 14 May 2020 13:19:24 -0500
From: Zach Metzinger <zmetzing@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] L band gear
Message-ID: <b4e005b5-b06c-69c7-8ef4-1fd413555919@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
On 05/13/20 21:21, Ed Krome via AMSAT-BB wrote:
> I?m a bit surprised that so few are using portable (and no homebrew) 1267.
Here?s an alternative, homebrew style. Something old and something new.
> Antenna: 12el hb yagi with folded dipole DE, mounted on top of Arrow with
8? fiberglass rod spacers
> Amplifier: hb brick amp with RA18H1213G. See AMSAT Journal Jan-Feb 2019
for construction details. Can do 30W, but never use that much.
> Transmit-converter: ancient hb, dbm + discreet transistor amps. Would be
so much easier today with MMIC?s. ~1/2W out. Originally built for AO-10 and
used a lot on -10 & -13
> RF (2M) source: Baofeng UV5R+ ht. Why? Because that thing has no problem
transmitting slightly below the 2M band edge. The trans-converter was
crystaled so 145 in = 1269 out. AO92 is 1267.x, so the trans-conv requires
143.x input. In the AO10&13 days, the driver was a Drake T4X driving an hb
2M transverter. Complicated, but as a fixed station (100+W out from 2x7289)
it worked well.
Ed-
I'm an avid home-brewer, but family, work, grad school, and volunteering
has gotten in the way of me getting a real satellite station on the air.
I have a mostly-built 23cm FM rig
(http://www.pe1jpd.nl/index.php/23cm_nbfm), which I bought as a
first-pass attempt at getting on 23cm. Just needs to be buttoned up into
a chassis and we're ready to roll.
I've also duplicated a few preamp designs (https://www.n0zgo.net/lna),
and started building a SatNOGS v2 rotator using laser-cut mounting
plates (https://www.n0zgo.net/satellite/satnogs/rotator_build).
Some day, I'll get this stuff done and on the air. :-)
I hope more amateurs build their own equipment. So many diagnostic aids
(SDR, o-scopes, spectrum analyzers) are available for cheap compared to
20 years ago!
--- Zach
N0ZGO
------------------------------
Message: 2
Date: Thu, 14 May 2020 13:25:18 -0500
From: "David J. Schmocker" <kj9idave@???????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Relayed sked request
Message-ID: <6957b6e7-60eb-f02b-9eb1-34be94c4755d@???????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
Jari:
Congratulations!? This is great news!
Still new to (getting QRV) on satellites, I don't know what current
linear birds have/enable common footprint (MEO?? HEO?) between both
Thailand and North America.. but?? such a venture is precisely what will
make me put my antennas up (now)!
73,
Dave KJ9I
On 5/14/20 10:56 AM, Jari A via AMSAT-BB wrote:
> Hi Guys,
>
> Kob, E21EJC is excited to work via RS-44.
> Bangkok OK03FP86MH
>
> He would be very happy to find stations to work with.
> Done three qsos with him at extreme distance 7898km / 4907 miles.
>
> He has good station for long distance qsos.
>
> Please contact him at:
>
> e21ejc (a) yahoo.com
>
> Best regards and wishes to avoid corona
>
> : Jari / OH2FQV
>
> Ps. open for ssb/fm skeds as well... kp20mf87ss
> _______________________________________________
> 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: https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 3
Date: Thu, 14 May 2020 11:41:18 -0700
From: Greg D <ko6th.greg@?????.???>
To: Zach Metzinger <zmetzing@?????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] L band gear
Message-ID: <0cd43dc7-3e87-74cf-fa3e-db3c0c30aaab@?????.???>
Content-Type: text/plain; charset=utf-8
Ed-
>
> I'm an avid home-brewer, but family, work, grad school, and
> volunteering has gotten in the way of me getting a real satellite
> station on the air.
>
> I have a mostly-built 23cm FM rig
> (http://www.pe1jpd.nl/index.php/23cm_nbfm), which I bought as a
> first-pass attempt at getting on 23cm. Just needs to be buttoned up
> into a chassis and we're ready to roll.
>
> I've also duplicated a few preamp designs (https://www.n0zgo.net/lna),
> and started building a SatNOGS v2 rotator using laser-cut mounting
> plates (https://www.n0zgo.net/satellite/satnogs/rotator_build).
>
> Some day, I'll get this stuff done and on the air. :-)
>
> I hope more amateurs build their own equipment. So many diagnostic
> aids (SDR, o-scopes, spectrum analyzers) are available for cheap
> compared to 20 years ago!
>
> --- Zach
> N0ZGO
Zach, all,
You'll also need an antenna. Surprised that's not been mentioned in
this drift into homebrewing...
Before I got my 30 element Beam at a swap meet, I was using a homemade
17 turn Helix. It was easy to make, and worked quite well. I would not
say that the beam was any better, especially since the helix is
circularly polarized. I still have it, and may swap it back into
service some day.
Greg KO6TH
------------------------------
Message: 4
Date: Thu, 14 May 2020 13:45:52 -0500
From: Zach Metzinger <zmetzing@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] L band gear
Message-ID: <efd73c12-ba66-b623-d355-6bebd9143997@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
On 05/14/20 13:41, Greg D wrote:
> You'll also need an antenna. Surprised that's not been mentioned in
> this drift into homebrewing...
>
> Before I got my 30 element Beam at a swap meet, I was using a homemade
> 17 turn Helix. It was easy to make, and worked quite well. I would not
> say that the beam was any better, especially since the helix is
> circularly polarized. I still have it, and may swap it back into
> service some day.
Yep! Plenty of designs out there, should one want to build vs buy:
https://vk1sotaon23cm.wordpress.com/23-cm-antennas/
One of these cheap, perhaps-not-perfect-but-good-enough VNAs would help
tune it up:
https://www.tindie.com/products/hcxqsgroup/nanovna-v2/
(I have the v1, which is good up to ~900 MHz, and have been pleased with
it.)
--- Zach
N0ZGO
------------------------------
Message: 5
Date: Thu, 14 May 2020 14:52:22 -0400
From: Burns Fisher <wb1fj-bb@??????.??>
To: Roy Dean <royldean@?????.???>
Cc: AMSAT BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Huskysat in safe mode
Message-ID:
<CABX7KxXmSpRaObkcfkNwTfzWTiiYZBXGwirYmLb6JqBOmNfA6w@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
You can blame yours truly for the Spacecraft Status safe mode. Turns out
that bit is updated in health mode, but in safe mode,the block that
contains that bit is one of the things that is not sent :-( So trust the
big "MODE" line at the top left of FoxTelem.
As to going into safe mode: All I can say is that we are still learning
about this satellite!
On Thu, May 14, 2020 at 1:01 PM Roy Dean via AMSAT-BB <amsat-bb@?????.???>
wrote:
> https://network.satnogs.org/observations/2201621/
>
> It appears to have changed modes at about 9:40z this morning....
>
> I don't think you were dreaming. When I checked this morning, the first
> > line of the HuskySat Telemetry page (
> > https://www.amsat.org/tlm/health.php?id=6&port=) said "Safe", but the
> > "Safe
> > Mode" indicator in the Spacecraft Status block said "False". So something
> > was going on..... --Roy
> > K3RLD
> _______________________________________________
> 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: https://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 6
Date: Thu, 14 May 2020 18:57:38 +0000
From: "Leffke, Zachary" <zleffke@??.???>
To: "AMSAT-BB@?????.???? <AMSAT-BB@?????.???>
Subject: Re: [amsat-bb] L band gear
Message-ID:
<MN2PR05MB703731985307B4E88CEAFB5FDFBC0@?????????????.????????.????.???????.??
?>
Content-Type: text/plain; charset="us-ascii"
Following up on an earlier request from Ed...here is the QEX article on a
GPS Disciplined VFO based on the Si5351
https://hamsci.org/sites/default/files/publications/2018_QEX_Downey_GPSDO_SigG
en (link will download a pdf).
There are a lot of example projects out there in terms of example Arduino
code and libraries for controlling the Si5351, particularly if you google
'Si5351 WSPR transmitter'. I saw at least one post about some building a
quadrature LO out of one as well (implying some ability to control phase
relationship that I don't fully understand yet between the three outputs).
'etherkit' and some of the products on QRP labs (that use the etherkit
software) are also useful search terms.
Also the adafruit breakout can be found here:
https://www.adafruit.com/product/2045, approx. $8.
The etherkit folks also make a breakout board:
https://www.etherkit.com/rf-modules/si5351a-breakout-board.html ($10) which
is the one used in the above link (though they are pretty interchangeable).
The base part is something like $2 on digikey for the custom PCB enthusiasts.
Again, not a drop in replacement for something like the DigiLO (Though I did
confirm the digiLO has specific switch settings that would produce Ifs at 2m
or 70cm for a 1265-ish RF freq.....there are a couple options). The Si5351
goes up to 160 MHz for starters (not 6 GHz), is a square wave generator and
produces lots of harmonics (filters!)........but it is cheap, simple to use,
and that first link above shows how to make a pretty cheap, GPS disciplined
signal generator.........There are other 'watch outs' about the base crystal
frequency when using the higher frequencies....not sure exactly what the
issue is, something about step size......but that's the fun of
homebrew.....lots of threads to pull.
For the really adventurous that like messing with untested HW and SW, there
is this:
https://github.com/zleffke/kicad_wspr/tree/master/si5351_featherwing_v1/rev-,
I'm attempting to get an Si5351 breakout into featherwing form factor (I
like the adafruit feather microcontrollers, and I like that adafruit posts
their EagleCAD files on github, making something like this fairly easy to
produce). There is also this for more Arduino code related to the
Si5351.... https://github.com/zleffke/arduino_wspr ...my attempts at custom
Arduino code, obvious from the name, I'm messing with WSPR, but the base
code for interfacing with the chip is in there as well as an example (I use
the etherkit libraries, unmodified). For the last two links.....USER
BEWARE....not sure if I actually know what I'm doing yet or not (though my
breadboarded WSPR transmitter based on this chip appears to work just fine).
Hihi
Hope this helps! Slight tangent from the core L-Band discussion, but
relevant.
-Zach, KJ4QLP
--
Research Associate
Aerospace & Ocean 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: 7
Date: Thu, 14 May 2020 14:59:35 -0400
From: Robert Bruninga <bruninga@????.???>
To: amsat bb <amsat-bb@?????.???>
Subject: [amsat-bb] Two way SSTV exchanges using PSAT2
Message-ID: <e21738b6d7971ef5dd89606980be09b5@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
The PSAT2 team has decided to enable the 10 meter uplink for user SSTV
experimentation with two-way user SSTV communication.
PSK31 usage has been light and SSTV downlink seems almost perfect as
reflected in PY5LF's example posted before, so why not let people do 2-way
SSTV? Simply transmit SSTV using SSB on the 29.4815 uplink WHILE someone
else is transmitting PSK31.
Ah, there's the rub. The transponder has to see a PSK31 modulation
somewhere in the passband (not used by SSTV) in order to key up the
transponder. AND the uplink station has to do the Doppler correction. But
unlike PSK31, SSTV is not phase coherent and so RIG control using any
satellite software can do fine. Also, if you can run two instances of
SSTV, you could see your own downlink on 435.350 for Quality control!
Maybe we can enlist the authors of SSTV software to not only generate the
SSTV tones, but also a mild PSK31 tone carrier down below 400 Hz. Anyone?
Actually, the "psk31" tone only needs to have 31.25 Hz AM modulation on the
tone carrier to do the trick, doesn?t really have to be PSK31..
Bob, WB4APR
------------------------------
Message: 8
Date: Thu, 14 May 2020 15:01:13 -0400 (EDT)
From: EDWARD KROME <e.krome@???????.???>
To: Zach Metzinger <zmetzing@?????.???>, Zach Metzinger via AMSAT-BB
<amsat-bb@?????.???>
Subject: Re: [amsat-bb] L band gear
Message-ID: <2038662107.1545823.1589482873680@???????.???????.???>
Content-Type: text/plain; charset=UTF-8
That's an interesting site. The hb antenna I mentioned using is similar to
the dl6wu 12 el with folded dipole. A design that caught my eye was the
piston trimmer gamma match arrangement. Clever. Simple. Worth a try. Be
interesting to see what the VNA thinks about it.
Thanks!
Ed K9EK
> On May 14, 2020 at 2:45 PM Zach Metzinger via AMSAT-BB
<amsat-bb@?????.???> wrote:
>
>
> On 05/14/20 13:41, Greg D wrote:
> > You'll also need an antenna. Surprised that's not been mentioned in
> > this drift into homebrewing...
> >
> > Before I got my 30 element Beam at a swap meet, I was using a homemade
> > 17 turn Helix. It was easy to make, and worked quite well. I would not
> > say that the beam was any better, especially since the helix is
> > circularly polarized. I still have it, and may swap it back into
> > service some day.
>
> Yep! Plenty of designs out there, should one want to build vs buy:
>
> https://vk1sotaon23cm.wordpress.com/23-cm-antennas/
>
> One of these cheap, perhaps-not-perfect-but-good-enough VNAs would help
> tune it up:
>
> https://www.tindie.com/products/hcxqsgroup/nanovna-v2/
>
> (I have the v1, which is good up to ~900 MHz, and have been pleased with
> it.)
>
> --- Zach
> N0ZGO
> _______________________________________________
> 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: https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 9
Date: Thu, 14 May 2020 15:05:23 -0400 (EDT)
From: EDWARD KROME <e.krome@???????.???>
To: "Leffke, Zachary" <zleffke@??.???>, "Leffke, Zachary via AMSAT-BB"
<amsat-bb@?????.???>
Subject: Re: [amsat-bb] L band gear
Message-ID: <652274306.1545911.1589483125801@???????.???????.???>
Content-Type: text/plain; charset=UTF-8
Yes, help it does. Now to spend the rest of the day trying to figure some of
that magic out...
Thnaks!
Ed
> On May 14, 2020 at 2:57 PM "Leffke, Zachary via AMSAT-BB"
<amsat-bb@?????.???> wrote:
>
>
> Following up on an earlier request from Ed...here is the QEX article on a
GPS Disciplined VFO based on the Si5351
>
>
https://hamsci.org/sites/default/files/publications/2018_QEX_Downey_GPSDO_SigG
en (link will download a pdf).
>
> There are a lot of example projects out there in terms of example Arduino
code and libraries for controlling the Si5351, particularly if you google
'Si5351 WSPR transmitter'. I saw at least one post about some building a
quadrature LO out of one as well (implying some ability to control phase
relationship that I don't fully understand yet between the three outputs).
'etherkit' and some of the products on QRP labs (that use the etherkit
software) are also useful search terms.
>
> Also the adafruit breakout can be found here:
https://www.adafruit.com/product/2045, approx. $8.
> The etherkit folks also make a breakout board:
https://www.etherkit.com/rf-modules/si5351a-breakout-board.html ($10) which
is the one used in the above link (though they are pretty interchangeable).
> The base part is something like $2 on digikey for the custom PCB
enthusiasts.
>
> Again, not a drop in replacement for something like the DigiLO (Though I
did confirm the digiLO has specific switch settings that would produce Ifs
at 2m or 70cm for a 1265-ish RF freq.....there are a couple options). The
Si5351 goes up to 160 MHz for starters (not 6 GHz), is a square wave
generator and produces lots of harmonics (filters!)........but it is cheap,
simple to use, and that first link above shows how to make a pretty cheap,
GPS disciplined signal generator.........There are other 'watch outs' about
the base crystal frequency when using the higher frequencies....not sure
exactly what the issue is, something about step size......but that's the fun
of homebrew.....lots of threads to pull.
>
> For the really adventurous that like messing with untested HW and SW,
there is this:
https://github.com/zleffke/kicad_wspr/tree/master/si5351_featherwing_v1/rev-,
I'm attempting to get an Si5351 breakout into featherwing form factor (I
like the adafruit feather microcontrollers, and I like that adafruit posts
their EagleCAD files on github, making something like this fairly easy to
produce). There is also this for more Arduino code related to the
Si5351.... https://github.com/zleffke/arduino_wspr ...my attempts at custom
Arduino code, obvious from the name, I'm messing with WSPR, but the base
code for interfacing with the chip is in there as well as an example (I use
the etherkit libraries, unmodified). For the last two links.....USER
BEWARE....not sure if I actually know what I'm doing yet or not (though my
breadboarded WSPR transmitter based on this chip appears to work just fine).
Hihi
>
> Hope this helps! Slight tangent from the core L-Band discussion, but
relevant.
> -Zach, KJ4QLP
>
> --
> Research Associate
> Aerospace & Ocean 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
>
>
>
> _______________________________________________
> 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: https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 10
Date: Thu, 14 May 2020 14:05:35 -0500
From: Zach Metzinger <zmetzing@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] L band gear
Message-ID: <e57dbe51-04df-2074-2a78-89426196ddfa@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
On 05/14/20 13:57, Leffke, Zachary via AMSAT-BB wrote:
> Again, not a drop in replacement for something like the DigiLO (Though I
did confirm the digiLO has specific switch settings that would produce Ifs
at 2m or 70cm for a 1265-ish RF freq.....there are a couple options). The
Si5351 goes up to 160 MHz for starters (not 6 GHz), is a square wave
generator and produces lots of harmonics (filters!)........but it is cheap,
simple to use, and that first link above shows how to make a pretty cheap,
GPS disciplined signal generator.........There are other 'watch outs' about
the base crystal frequency when using the higher frequencies....not sure
exactly what the issue is, something about step size......but that's the fun
of homebrew.....lots of threads to pull.
Zach,
Someone industrious person could create a break-out board for the
MAX2870/MAX2871 and get 6 GHz. It would require careful engineering, but
would be interesting.
--- Zach
N0ZGO
------------------------------
Message: 11
Date: Thu, 14 May 2020 12:19:57 -0700
From: Greg D <ko6th.greg@?????.???>
To: Zach Metzinger <zmetzing@?????.???>, amsat-bb@?????.???
Subject: Re: [amsat-bb] L band gear
Message-ID: <60538879-833a-9c10-caa6-bc2a2b115048@?????.???>
Content-Type: text/plain; charset=us-ascii
Zach Metzinger via AMSAT-BB wrote:
> On 05/14/20 13:41, Greg D wrote:
>> You'll also need an antenna. Surprised that's not been mentioned in
>> this drift into homebrewing...
>>
>> Before I got my 30 element Beam at a swap meet, I was using a homemade
>> 17 turn Helix. It was easy to make, and worked quite well. I would not
>> say that the beam was any better, especially since the helix is
>> circularly polarized. I still have it, and may swap it back into
>> service some day.
>
> Yep! Plenty of designs out there, should one want to build vs buy:
>
> https://vk1sotaon23cm.wordpress.com/23-cm-antennas/
>
> One of these cheap, perhaps-not-perfect-but-good-enough VNAs would
> help tune it up:
>
> https://www.tindie.com/products/hcxqsgroup/nanovna-v2/
>
> (I have the v1, which is good up to ~900 MHz, and have been pleased
> with it.)
>
> --- Zach
> N0ZGO
Wow, love some of those designs. Quite creative.
My helix was pretty basic. It ended up being 17 turns because that's
where I ran out of wire :) I didn't (still don't) have any equipment to
tune it up, so just depended on the helix being inherently pretty
forgiving to make it all work. I forget the exact dimensions, but the
idea was to mark the wire every "x" millimeters, then twist and stretch
the turns to space them every "y" millimeters. I can't find my
reference to "x" and "y", but I expect x is one wavelength at the target
frequency, and y has something to do with the speed of light and the
velocity factor of the winding, with the idea that the rotating
wavefront basically screws itself onto the helix winding. There are a
number of "helix calculator" sites where the dimensions can be generated.
http://home.wavecable.com/~ko6th/IMG_0138.JPG
Fun project.
Greg KO6TH
------------------------------
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!
https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 15, Issue 162
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