| |
CX2SA > SATDIG 24.03.16 00:04l 783 Lines 30120 Bytes #999 (0) @ WW
BID : AMSATBB1189
Read: GUEST
Subj: AMSAT-BB-digest V11 89
Path: IW8PGT<IZ3LSV<IW0QNL<JH4XSY<JE7YGF<7M3TJZ<CX2SA
Sent: 160323/2200Z @:CX2SA.SAL.URY.SOAM #:41110 [Salto] FBB7.00e $:AMSATBB1189
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. J8 on SO-50 (W2JV)
2. IRLP node interference to FO-29 (Kevin M)
3. Re: IRLP node interference to FO-29 (Skyler F)
4. sad to hear the malicious qrm on so50 (jeffory broughton)
5. Re: sad to hear the malicious qrm on so50 (Paul Stoetzer)
6. Re: Optical shaft encoders (Robert McGwier)
7. [Video] Walter Jackson Elementary Reception from Raleigh,
North Carolina (John Brier)
8. AO-85 data mode (Andrew Glasbrenner)
9. Re: AO-85 data mode (Jeff A. Boyd)
10. Re: AO-85 data mode (Andrew Glasbrenner)
11. Re: AO-85 data mode (Jeff A. Boyd)
12. DCC Call for Papers (Ford, Steve, WB8IMY)
13. Re: [Video] Walter Jackson Elementary Reception from Raleigh,
North Carolina (Tim N8DEU)
14. Re: Optical shaft encoders (John Toscano)
----------------------------------------------------------------------
Message: 1
Date: Tue, 22 Mar 2016 17:56:42 -0400
From: "W2JV" <PeteW2JV@xxxxxxx.xxx>
To: <AMSAT-BB@xxxxx.xxx>, "starcom" <starcom-bb@xxxxxxxx.xxx>
Subject: [amsat-bb] J8 on SO-50
Message-ID: <520B53CB7B7B4B529CF912F94FA69168@xxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Good Afternoon:
Sorry for the short notice: N2IEN, Pat will be on the 22:29 U pass of SO-50,
FN 30 time, as J8/WW2DX- FK-93, he will be on the island to the 26th, have
fun!
73 Peter
W2JV
------------------------------
Message: 2
Date: Tue, 22 Mar 2016 21:57:28 +0000 (UTC)
From: Kevin M <n4ufo@xxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] IRLP node interference to FO-29
Message-ID:
<1769960393.3515476.1458683848261.JavaMail.yahoo@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
UPDATE: I got another reply from the individual who's callsign I heard... he
is forwarding information to a couple folks with IRLP. Fingers crossed. If
any AMSAT gurus, hear from some IRLP gurus, there you go... ball is
hopefully rolling. Time for my daily walk. =^)
73,Kevin N4UFO
------------------------------
Message: 3
Date: Tue, 22 Mar 2016 16:24:21 -0600
From: Skyler F <electricity440@xxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] IRLP node interference to FO-29
Message-ID:
<CAJNyT0_8ztWt8djdqnqLoNuACpH_MLtwtH0bj7Gzksaw_QDOUg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Could you tell me what frequency would the IRLP node have been on the input
up to the sat? I can do a search based on frequency (Given that the user
stated the frequency on the IRLP status page). I'll search on AllStar too,
it could be an AllStar node. At a minimum, I can eliminate nodes it was
not.
What net was this, next time the net comes along, I can check the reflector
status, and see all of the nodes that connected.
What region would the satellite have covered at this time?
73,
Skyler
On Tue, Mar 22, 2016 at 3:57 PM, Kevin M via AMSAT-BB <amsat-bb@xxxxx.xxx>
wrote:
> UPDATE: I got another reply from the individual who's callsign I heard...
> he is forwarding information to a couple folks with IRLP. Fingers crossed.
> If any AMSAT gurus, hear from some IRLP gurus, there you go... ball is
> hopefully rolling. Time for my daily walk. =^)
> 73,Kevin N4UFO
> _______________________________________________
> 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
>
--
Skyler Fennell
amsatnet.info
KD?WHB
electricity440@xxxxx.xxx
------------------------------
Message: 4
Date: Tue, 22 Mar 2016 18:36:18 -0400
From: jeffory broughton <jefforybroughton@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] sad to hear the malicious qrm on so50
Message-ID:
<CACm2je1VDyK_k6rfLO=0MCeyu8VPeXjNTeRDXp9Mx+Zt11+B2A@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Very sad to hear this on so50 on the 22:30 pass today.
jeff broughton
------------------------------
Message: 5
Date: Tue, 22 Mar 2016 18:40:57 -0400
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: jeffory broughton <jefforybroughton@xxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] sad to hear the malicious qrm on so50
Message-ID:
<CABzOSOoT1R8tFzALm27pXTFjqLfmQgeO3CM1z1cdeO5nUCYAxg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I never jump to the conclusion that it's malicious. Someone's PTT
could have gotten stuck. But the lengthy dead keying has happened on a
few passes recently, so who knows.
73,
Paul, N8HM
On Tue, Mar 22, 2016 at 6:36 PM, jeffory broughton
<jefforybroughton@xxxxx.xxx> wrote:
> Very sad to hear this on so50 on the 22:30 pass today.
>
> 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
------------------------------
Message: 6
Date: Tue, 22 Mar 2016 21:53:57 -0400
From: Robert McGwier <rwmcgwier@xxxxx.xxx>
To: zg3410@xxxxx.xxx
Cc: amsat bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Optical shaft encoders
Message-ID:
<CA+K5gzeFFRsfchGLmh+=X9MNeiAtmRZethKQ_HDfLVgjfbi6dg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
This is an awesome conversation and we are extremely grateful.
Zach is trying to build a robust repeatable super ground station.
Bob
On Mar 18, 2016 6:30 AM, "Daniel Cussen" <zg3410@xxxxx.xxx> wrote:
> >for those with Alfa Radio HR model rotators, maybe you have same/similar
> issues?
>
> I do not have a HR model, but I do have a similar system and we are
> seeing similar problems.
>
> First off there is no end stop safety switches. This means if the
> control box becomes confused it can damage coax cables and move
> elevation to positions to damage antennas etc.
>
> Second, there is no absolute position sent, meaning if it gets
> confused it cannot reset itself as only the amount of movement is
> sent, not the actual current position. Over time this means errors
> accumulate and grow.
>
> The basic Yaesu G5500 has both safety protections meaning it is
> unlikely a confused control box will result in damaged antennas or
> coax.
>
> >So first off, Bob is basically asking if anyone has built a custom
> optical shaft encoder to >replace the magnetic hall effect sensors in the
> High Resolution Big-Ras rotators. >Machining, circuit design,
> performance.....?
>
> I do not know, however I have nearly added safety switches to a
> similar model to turn off the motor to protect the coax cables. This
> is also very important if the relays stick in the control box.
>
> Others have removed or replaced position sensors with more accurate
> absolute positions sensors. In particular the HH-12 is used by a lot
> of large EME stations as it is both accurate, cheap and absolute
> position. If you connect it using a rubber hose it will protect itself
> from damage if you try turn it too much.
>
> http://www.vk5dj.com/hh-12.html
> Mounting it to the Big-Raz is unknown, but here is a similar project:
> http://e-kutz.eu/seite10.html
> Here is a complete controller with two sensors:
> http://f1frv.free.fr/main3o_AZ_EL_Display.html
>
> >The noise voltage was 1 or 2 volts peak to peak when measuring the lines
> with an o->scope.
>
> This is not good.
>
> > The shields of the cables are connected together at the connector on the
> rotator (8 pin >MIC connector) and at the connector on the MD-01 control
> box. The shield is also >jumpered to a good station ground at the control
> box.
>
> To reduce noise the recommendation it to only connect the shield AT
> ONE END, and not both ends. Normally only at the shack end. I think
> this prevents ground loops.
>
> >So that's about it in a 'nutshell.'
>
> So in my case we have a similar sensor. All the HAMTV ground stations
> in Europe (6) are using Prosistel Az/El with uses hall magnetic
> sensors with thousands of pulses per second. We too are seeing
> positions change with the motor stop, so much so thousands of pulses
> must be read while stopped.
>
> The solutions we have used so far:
> 1) Multiple screened cables as you suggest grounded at one end
> 2) Adding filters to the motor wiring to reduce motor noise/cross talk
> 3) I experimented with stepping up rotation feedback from 0/5V to 0/20V
> 4) I am working on a replacement control box, where we can modify the code
> 5) I am adding safety switches to protect the coax.
>
> The real solution would be for the manufacturer to use absolute
> position feedback. There is complete controllers available, if you can
> manage to connect their sensors to your existing system using
> belts/gears/cogs etc.
>
> Another option I think you should consider is using your own control
> box. We found that the Prosistel supplied control box was flawed in
> some ways. The open source control box is already designed to take
> pulse inputs, and seems to work with thousands of pulses per second.
> You can even just hook the inputs in parallel to see if the problem is
> the control box or the sensor outputs. All you need is an arduino
> (mega preferably) and the correct version of the code. It will display
> a second opinion of the position, so you can determine if the control
> box has issues too. We found our control box misses some pulses, we
> think it is busy updating the LCD or talking to the computer and
> misses pulses.
>
> Other features of this is a master/slave option, meaning the
> controller can be mounted at the antenna, meaning only short cable
> runs to the position sensor.
>
> http://blog.radioartisan.com/yaesu-rotator-computer-serial-interface/
>
> In the long term absolute position sensors combined with safety
> switches are the only real solution. For HF even a bog standard
> potentiometer would probably work better. Some suppliers use 3 or 10
> turn potentiometers to allow 360 degrees or 1.5 turns rotation.
> _______________________________________________
> 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: Wed, 23 Mar 2016 01:10:48 -0400
From: John Brier <johnbrier@xxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] [Video] Walter Jackson Elementary Reception from
Raleigh, North Carolina
Message-ID:
<CALn0fKPAq6YvN40yEy667LRqcFxMkdSQSH4+QNNfTAAkT=4rPw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Frank's First ISS Reception - Walter Jackson Elementary
https://www.youtube.com/watch?v=zxrOhKytmbU
I met Frank, NF2O on Facebook. I shared my last video of the Miami
Florida school ISS contact reception on the Ham Radio Operators
Facebook group, of which Frank was a member. He saw the video and
recognized the landfill park I filmed the video at. He commented on my
video saying that, and that it was his favorite place to work
satellites from. After chatting we agreed to meetup for the next ISS
reception. This video is a result of that.
Walter Jackson Elementary, Decatur, Alabama, direct via N8DEU
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Timothy Peake KG5BVI
Contact is a go for: Fri 2016-03-18 13:53:49 UTC 69 deg
Time Satellite Azm Elv Mag Range S.Azm S.Elv
--------------------------------------------------------------------------
Decatur
2016-03-18 09:52:34 ISS 310.6 0.0 2.5 2385 108.1 23.3
2016-03-18 09:58:04 ISS 224.5 71.8 -0.8 428 109.1 24.4
2016-03-18 10:03:32 ISS 138.2 0.0 3.6 2371 110.0 25.5
Raleigh
2016-03-18 09:53:53 ISS 299.4 0.0 2.6 2388 115.1 29.4
2016-03-18 09:55:19 ISS 292.7 5.1 2.1 1839 115.4 29.7
2016-03-18 09:59:03 ISS 229.6 23.2 1.0 905 116.1 30.4
2016-03-18 10:02:47 ISS 166.0 5.0 3.0 1832 116.8 31.1
2016-03-18 10:04:11 ISS 159.3 0.0 3.7 2366 117.1 31.3
73,
John KG4AKV in Raleigh, NC FM05
------------------------------
Message: 8
Date: Wed, 23 Mar 2016 10:09:51 -0400
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] AO-85 data mode
Message-ID: <08cb01d1850d$aaec3190$00c494b0$@xxx>
Content-Type: text/plain; charset="us-ascii"
All,
This morning and yesterday morning I switched AO-85 into high-speed data
mode over the SE USA. This was necessary for some testing of ground station
components prior to the launch of Fox-1Cliff and -1D coming up. I apologize
for any interruption in doing so. I hope everyone had their telemetry
program on "auto" and caught a few high speed frames!
73, Drew KO4MA
AMSAT VP Operations
------------------------------
Message: 9
Date: Wed, 23 Mar 2016 23:41:12 +0900
From: "Jeff A. Boyd" <the2belo@xxx.xxxxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] AO-85 data mode
Message-ID: <20160323234112.6147.63087B45@xxx.xxxxxxx.xx.xx>
Content-Type: text/plain; charset="US-ASCII"
On Wed, 23 Mar 2016 10:09:51 -0400, "Andrew Glasbrenner"
<glasbrenner@xxxxxxxxxx.xxx> wrote:
> All,
>
> This morning and yesterday morning I switched AO-85 into high-speed data
> mode over the SE USA. This was necessary for some testing of ground station
> components prior to the launch of Fox-1Cliff and -1D coming up. I apologize
> for any interruption in doing so. I hope everyone had their telemetry
> program on "auto" and caught a few high speed frames!
Any chance of leaving it in high-speed mode for a full orbit sometime in the
future so us non-Unitedstatesians can have a crack at those decodes? :)
--
J. Boyd, JR2TTS/NI3B
the2belo@xxx.xxxxxxx.xx.xx
http://www.flickr.com/photos/the2belo/
http://www.qrz.com/db/JR2TTS
Twitter: @xxxxxxxx
------------------------------
Message: 10
Date: Wed, 23 Mar 2016 10:47:32 -0400
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] AO-85 data mode
Message-ID: <08ec01d18512$ee7bc790$cb7356b0$@xxx>
Content-Type: text/plain; charset="us-ascii"
Unfortunately, high speed data mode only runs for 15 minutes, then back to
transponder mode. Europe and South America get the ends of Ascending and
Descending passes where we enable it, but JA is just too far from a command
station. Sorry!
73, Drew KO4MA
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Jeff A. Boyd
Sent: Wednesday, March 23, 2016 10:41 AM
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] AO-85 data mode
On Wed, 23 Mar 2016 10:09:51 -0400, "Andrew Glasbrenner"
<glasbrenner@xxxxxxxxxx.xxx> wrote:
> All,
>
> This morning and yesterday morning I switched AO-85 into high-speed
> data mode over the SE USA. This was necessary for some testing of
> ground station components prior to the launch of Fox-1Cliff and -1D
> coming up. I apologize for any interruption in doing so. I hope
> everyone had their telemetry program on "auto" and caught a few high speed
frames!
Any chance of leaving it in high-speed mode for a full orbit sometime in the
future so us non-Unitedstatesians can have a crack at those decodes? :)
--
J. Boyd, JR2TTS/NI3B
the2belo@xxx.xxxxxxx.xx.xx
http://www.flickr.com/photos/the2belo/
http://www.qrz.com/db/JR2TTS
Twitter: @xxxxxxxx
_______________________________________________
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: 11
Date: Thu, 24 Mar 2016 00:10:13 +0900
From: "Jeff A. Boyd" <the2belo@xxx.xxxxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] AO-85 data mode
Message-ID: <20160324001012.614B.63087B45@xxx.xxxxxxx.xx.xx>
Content-Type: text/plain; charset="US-ASCII"
On Wed, 23 Mar 2016 10:47:32 -0400, "Andrew Glasbrenner"
<glasbrenner@xxxxxxxxxx.xxx> wrote:
> Unfortunately, high speed data mode only runs for 15 minutes, then back to
> transponder mode. Europe and South America get the ends of Ascending and
> Descending passes where we enable it, but JA is just too far from a command
> station. Sorry!
Ah, well that explains why I never had any of them then. It was worth a try!
Perhaps when I go to the US this coming August...
--
J. Boyd, JR2TTS/NI3B
the2belo@xxx.xxxxxxx.xx.xx
http://www.flickr.com/photos/the2belo/
http://www.qrz.com/db/JR2TTS
Twitter: @xxxxxxxx
------------------------------
Message: 12
Date: Wed, 23 Mar 2016 15:37:50 +0000
From: "Ford, Steve, WB8IMY" <sford@xxxx.xxx>
To: "rtty@xxxxxxxxxx.xxxx <rtty@xxxxxxxxxx.xxx>, AMSAT
<amsat-bb@xxxxx.xxx>, "VHF@xxxx.xxxxxxxx.xxxx <VHF@xxxx.xxxxxxxx.xxx>,
"digitalradio@xxxxxxxxxxx.xxxx <digitalradio@xxxxxxxxxxx.xxx>
Subject: [amsat-bb] DCC Call for Papers
Message-ID:
<6BDF4F7F3613DC4E90A42F93921B47BD176E9720@xxxxxxxx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Technical papers are solicited for presentation at the 35th Annual
ARRL/TAPR<http://www.tapr.org/> Digital Communications Conference
(DCC<http://www.tapr.org/dcc.html>), to be held September 16-18 in St
Petersburg, Florida. Papers will also be published in the Conference
Proceedings. Authors do not need to attend the conference to have their
papers included in the Proceedings. The submission deadline is July 31, 2016.
The ARRL/TAPR Digital Communications Conference is an international forum
for technically minded radio amateurs to meet and present new ideas and
techniques. Paper/presentation topic areas include -- but are not limited to
-- software defined radio (SDR), digital voice, digital satellite
communication, digital signal processing (DSP), HF digital modes, adapting
IEEE 802.11 systems for Amateur Radio, Global Positioning System (GPS),
Automatic Position Reporting System (APRS), Linux in Amateur Radio, AX.25
updates and Internet operability with Amateur Radio networks.
Submit papers to via e-mail<mailto:maty@xxxx.xxx> or via post to Maty
Weinberg, KB1EIB, ARRL, 225 Main St, Newington, CT 06111. Papers will be
published exactly as submitted, and authors will retain all rights.
------------------------------
Message: 13
Date: Wed, 23 Mar 2016 10:56:50 -0500
From: Tim N8DEU <n8deu@xxxxxxx.xxx>
To: John Brier <johnbrier@xxxxx.xxx>, AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] [Video] Walter Jackson Elementary Reception
from Raleigh, North Carolina
Message-ID: <BAY407-EAS142CF0F17F10F3F91D3EB4FE810@xxx.xxx>
Content-Type: text/plain; charset="utf-8"
John,
That is awesome!
Thanks for sharing your experience from Raleigh, NC. We had some people
share a similar experience using handheld beams with their HT at our local
club meeting last Friday night. They were very excited to hear the
transmissions from the ISS.
It makes you wonder how many people were attempting to hear the same
conversation. We received reports of people hearing the signals on their HT
using the standard antenna attached as the ISS approached maximum elevation.
Thank You,
Tim - N8DEU
Sent from my Windows Phone
________________________________
From: John Brier<mailto:johnbrier@xxxxx.xxx>
Sent: ?3/?23/?2016 12:10 AM
To: AMSAT BB<mailto:amsat-bb@xxxxx.xxx>
Cc: Tim N8DEU<mailto:n8deu@xxxxxxx.xxx>
Subject: [Video] Walter Jackson Elementary Reception from Raleigh, North
Carolina
Frank's First ISS Reception - Walter Jackson Elementary
https://www.youtube.com/watch?v=zxrOhKytmbU
I met Frank, NF2O on Facebook. I shared my last video of the Miami
Florida school ISS contact reception on the Ham Radio Operators
Facebook group, of which Frank was a member. He saw the video and
recognized the landfill park I filmed the video at. He commented on my
video saying that, and that it was his favorite place to work
satellites from. After chatting we agreed to meetup for the next ISS
reception. This video is a result of that.
Walter Jackson Elementary, Decatur, Alabama, direct via N8DEU
The ISS callsign is presently scheduled to be NA1SS
The scheduled astronaut is Timothy Peake KG5BVI
Contact is a go for: Fri 2016-03-18 13:53:49 UTC 69 deg
Time Satellite Azm Elv Mag Range S.Azm S.Elv
--------------------------------------------------------------------------
Decatur
2016-03-18 09:52:34 ISS 310.6 0.0 2.5 2385 108.1 23.3
2016-03-18 09:58:04 ISS 224.5 71.8 -0.8 428 109.1 24.4
2016-03-18 10:03:32 ISS 138.2 0.0 3.6 2371 110.0 25.5
Raleigh
2016-03-18 09:53:53 ISS 299.4 0.0 2.6 2388 115.1 29.4
2016-03-18 09:55:19 ISS 292.7 5.1 2.1 1839 115.4 29.7
2016-03-18 09:59:03 ISS 229.6 23.2 1.0 905 116.1 30.4
2016-03-18 10:02:47 ISS 166.0 5.0 3.0 1832 116.8 31.1
2016-03-18 10:04:11 ISS 159.3 0.0 3.7 2366 117.1 31.3
73,
John KG4AKV in Raleigh, NC FM05
------------------------------
Message: 14
Date: Wed, 23 Mar 2016 16:58:24 -0500
From: John Toscano <tosca005@xxx.xxx>
To: Robert McGwier <rwmcgwier@xxxxx.xxx>
Cc: zg3410@xxxxx.xxxx amsat bb <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Optical shaft encoders
Message-ID:
<CABGf72p9CoNVOSe7=iGTOkOSC+=kjEHQYPGge0k2wLnhwAMZRg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Bob et. al.:
Would something like this:
https://www.adafruit.com/products/2472
...be useful for the purpose of determining absolute position without
relying on mechanical linkages of gears, belts, pulses, potentiometers,
etc.? It uses 3-axis magnetometers, 3-axis gyros, and 3-axis
accelerometers, and a Cortex M0 ARM to do all the hard computations that
combine the three types of data into a viable position indication. It is
inexpensive enough that I will probably install one when I finally get
around to raising a tower at my new QTH, and using it only for readouts at
first. I have been using and will resume using Yaesu rotators when the
tower goes up, so no urgent need to add safety limit switches etc. In many
years of operation at my prior QTH, the rotator never got "confused" about
its position except when somebody put tension on the cable plugged into the
back of the control box and loosened some of the connections between plug
and socket. I do realize that even the G1000SDX model I was/will be using
is not hefty enough for some applications, but again it served me well for
many years in spite of temperature swings from -40F to +105F. (Yeah, it
turned a bit slower at the begining of a contest when the temp was -40F and
the wind chill was -60F. OK, wind chill doesn't apply to inanimate objects,
but -40F actual is pretty darned cold. Plus the ice and snow added on
didn't help.) :-)
73 de W0JT/5
EN34js -> EL09vu
On Tue, Mar 22, 2016 at 8:53 PM, Robert McGwier <rwmcgwier@xxxxx.xxx> wrote:
> This is an awesome conversation and we are extremely grateful.
>
> Zach is trying to build a robust repeatable super ground station.
>
> Bob
> On Mar 18, 2016 6:30 AM, "Daniel Cussen" <zg3410@xxxxx.xxx> wrote:
>
> > >for those with Alfa Radio HR model rotators, maybe you have same/similar
> > issues?
> >
> > I do not have a HR model, but I do have a similar system and we are
> > seeing similar problems.
> >
> > First off there is no end stop safety switches. This means if the
> > control box becomes confused it can damage coax cables and move
> > elevation to positions to damage antennas etc.
> >
> > Second, there is no absolute position sent, meaning if it gets
> > confused it cannot reset itself as only the amount of movement is
> > sent, not the actual current position. Over time this means errors
> > accumulate and grow.
> >
> > The basic Yaesu G5500 has both safety protections meaning it is
> > unlikely a confused control box will result in damaged antennas or
> > coax.
> >
> > >So first off, Bob is basically asking if anyone has built a custom
> > optical shaft encoder to >replace the magnetic hall effect sensors in the
> > High Resolution Big-Ras rotators. >Machining, circuit design,
> > performance.....?
> >
> > I do not know, however I have nearly added safety switches to a
> > similar model to turn off the motor to protect the coax cables. This
> > is also very important if the relays stick in the control box.
> >
> > Others have removed or replaced position sensors with more accurate
> > absolute positions sensors. In particular the HH-12 is used by a lot
> > of large EME stations as it is both accurate, cheap and absolute
> > position. If you connect it using a rubber hose it will protect itself
> > from damage if you try turn it too much.
> >
> > http://www.vk5dj.com/hh-12.html
> > Mounting it to the Big-Raz is unknown, but here is a similar project:
> > http://e-kutz.eu/seite10.html
> > Here is a complete controller with two sensors:
> > http://f1frv.free.fr/main3o_AZ_EL_Display.html
> >
> > >The noise voltage was 1 or 2 volts peak to peak when measuring the lines
> > with an o->scope.
> >
> > This is not good.
> >
> > > The shields of the cables are connected together at the connector on
> the
> > rotator (8 pin >MIC connector) and at the connector on the MD-01 control
> > box. The shield is also >jumpered to a good station ground at the
> control
> > box.
> >
> > To reduce noise the recommendation it to only connect the shield AT
> > ONE END, and not both ends. Normally only at the shack end. I think
> > this prevents ground loops.
> >
> > >So that's about it in a 'nutshell.'
> >
> > So in my case we have a similar sensor. All the HAMTV ground stations
> > in Europe (6) are using Prosistel Az/El with uses hall magnetic
> > sensors with thousands of pulses per second. We too are seeing
> > positions change with the motor stop, so much so thousands of pulses
> > must be read while stopped.
> >
> > The solutions we have used so far:
> > 1) Multiple screened cables as you suggest grounded at one end
> > 2) Adding filters to the motor wiring to reduce motor noise/cross talk
> > 3) I experimented with stepping up rotation feedback from 0/5V to 0/20V
> > 4) I am working on a replacement control box, where we can modify the
> code
> > 5) I am adding safety switches to protect the coax.
> >
> > The real solution would be for the manufacturer to use absolute
> > position feedback. There is complete controllers available, if you can
> > manage to connect their sensors to your existing system using
> > belts/gears/cogs etc.
> >
> > Another option I think you should consider is using your own control
> > box. We found that the Prosistel supplied control box was flawed in
> > some ways. The open source control box is already designed to take
> > pulse inputs, and seems to work with thousands of pulses per second.
> > You can even just hook the inputs in parallel to see if the problem is
> > the control box or the sensor outputs. All you need is an arduino
> > (mega preferably) and the correct version of the code. It will display
> > a second opinion of the position, so you can determine if the control
> > box has issues too. We found our control box misses some pulses, we
> > think it is busy updating the LCD or talking to the computer and
> > misses pulses.
> >
> > Other features of this is a master/slave option, meaning the
> > controller can be mounted at the antenna, meaning only short cable
> > runs to the position sensor.
> >
> > http://blog.radioartisan.com/yaesu-rotator-computer-serial-interface/
> >
> > In the long term absolute position sensors combined with safety
> > switches are the only real solution. For HF even a bog standard
> > potentiometer would probably work better. Some suppliers use 3 or 10
> > turn potentiometers to allow 360 degrees or 1.5 turns rotation.
> > _______________________________________________
> > 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
>
------------------------------
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 11, Issue 89
****************************************
Read previous mail | Read next mail
| |
