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CX2SA > SATDIG 11.07.18 15:26l 927 Lines 30457 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: Trying to understand downlink corrections (Pedro Converso)
2. Re: Trying to understand downlink corrections (W3AB/GEO)
3. Re: Trying to understand downlink corrections (Alan)
4. Re: Trying to understand downlink corrections (Jay Cox)
5. Re: Trying to understand downlink corrections (W3AB/GEO)
6. Re: Trying to understand downlink corrections
(k6vug@?????????.????
7. WARNING -- PHISHING masquerading as amsat.org (Jim Sanford)
8. Spid RAS rotor issue (kb2mjeff@???.????
9. Re: Spid RAS rotor issue (Dave Webb KB1PVH)
----------------------------------------------------------------------
Message: 1
Date: Tue, 10 Jul 2018 15:21:53 -0300
From: Pedro Converso <pconver@?????.???>
To: "k6vug@?????????.???? <k6vug@?????????.???>
Cc: AMSAT BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Trying to understand downlink corrections
Message-ID:
<CANTZqKmmfAMqhhYs6ZkoWTgpvrdTsFR-1Chno6jjkcd2-rNeKQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Umesh,
You're right, some satellites i.e AO-91, AO-73 do show temperature and
solar illumination afects frequency, other possible cause is older TLE
keplers data. ( For often updated keps try
http://amsat.org.ar/keps.txt )
Learn is a never ending activity :)
73, LU7ABF, Pedro
On 7/10/18, k6vug@?????????.??? <k6vug@?????????.???> wrote:
> Greetings,
> I have been using a SDR dongle to receive the downlinks of SSB satellites.
> The combination of SatPC32's Downlink Correction feature and the SDR's
> visual display helps to zero beat the CW beacon exceptionally well. The
> Lat/Lon is good to 6 decimals. However, I find that the downlink correction
> needed is quite different for different satellites. Could it be due to
> rounding off errors or due to temperature variations at the satellite itself
> ? Maybe this has been explained earlier, but I wonder why ?
>
> Obviously, the more I learn, shows how less I know... Thanks for any
> pointers !
>
> 73!
> Umesh
> k6vug
>
> _______________________________________________
> 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: 2
Date: Tue, 10 Jul 2018 11:37:20 -0700
From: W3AB/GEO <w3ab@?????.???>
To: Pedro Converso <pconver@?????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] Trying to understand downlink corrections
Message-ID: <de6196bd-dce8-4969-b72a-9ca5fb2ee9e5@?????.???>
Content-Type: text/plain; charset=UTF-8
Bird speed and altitude?
?___
Sent from my two way wrist watch
73 de W3AB/GEO?
On Jul 10, 2018, 11:24, at 11:24, Pedro Converso <pconver@?????.???> wrote:
>Umesh,
>
>You're right, some satellites i.e AO-91, AO-73 do show temperature and
>solar illumination afects frequency, other possible cause is older TLE
>keplers data. ( For often updated keps try
>http://amsat.org.ar/keps.txt )
>
>Learn is a never ending activity :)
>
>73, LU7ABF, Pedro
>
>On 7/10/18, k6vug@?????????.??? <k6vug@?????????.???> wrote:
>> Greetings,
>> I have been using a SDR dongle to receive the downlinks of SSB
>satellites.
>> The combination of SatPC32's Downlink Correction feature and the
>SDR's
>> visual display helps to zero beat the CW beacon exceptionally well.
>The
>> Lat/Lon is good to 6 decimals. However, I find that the downlink
>correction
>> needed is quite different for different satellites. Could it be due
>to
>> rounding off errors or due to temperature variations at the satellite
>itself
>> ? Maybe this has been explained earlier, but I wonder why ?
>>
>> Obviously, the more I learn, shows how less I know... Thanks for any
>> pointers !
>>
>> 73!
>> Umesh
>> k6vug
>>
>> _______________________________________________
>> 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: 3
Date: Tue, 10 Jul 2018 13:41:22 -0500
From: "Alan" <wa4sca@?????.???>
To: <k6vug@?????????.???>, "'AMSAT BB'" <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Trying to understand downlink corrections
Message-ID: <000001d4187d$9a167a50$ce436ef0$@?????.???>
Content-Type: text/plain; charset="utf-8"
Umesh,
There are two primary satellite issues. First, the published frequencies
are usually nominal values obtained during ground checkout. Over time due to
normal component aging, radiation, loss of voltage regulation, etc they can
drift.
The second is the temperature effect you mentioned. You will find that the
beacon and transponder calibration will change slightly with the spacecraft
temperature as it goes through periods of eclipse and full illumination.
There is also a slight seasonal shift which you can see. This is most
prominent in CubeSats which have very little thermal inertia. Also, the are
tradeoffs to be made in terms of power consumption, radiation resistance,
and performance. AO-7 also drifts due to the lack of a battery to stabilize
the voltage.
Another issue is your station computer clock. They can drift rather badly,
and the operating system may not do a very good job of syncing them with a
reliable time standard. There are some free programs which do an excellent
job available.
73,
Alan
WA4SCA
<-----Original Message-----
<From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of
<k6vug@?????????.???
<Sent: Tuesday, July 10, 2018 12:28 PM
<To: AMSAT BB <amsat-bb@?????.???>
<Subject: [amsat-bb] Trying to understand downlink corrections
<
<Greetings,
<I have been using a SDR dongle to receive the downlinks of SSB satellites.
The
<combination of SatPC32's Downlink Correction feature and the SDR's visual
<display helps to zero beat the CW beacon exceptionally well.? The Lat/Lon
is
<good to 6 decimals.? However, I find that the downlink correction needed
is
<quite different for different satellites. Could it be due to rounding off
errors or
<due to temperature variations at the satellite itself ??? Maybe this has
been
<explained earlier, but I wonder why ?
<
<Obviously, the more I learn, shows how less I know...? Thanks for any
pointers
<!
<
<73!
<Umesh
<k6vug
<
<_______________________________________________
<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: Tue, 10 Jul 2018 19:41:11 +0000 (UTC)
From: Jay Cox <sqrtofone@?????.???>
To: k6vug@?????????.???? 'AMSAT BB' <amsat-bb@?????.???>,
<APBIDDLE@???????.???>
Subject: Re: [amsat-bb] Trying to understand downlink corrections
Message-ID: <2069565900.2287435.1531251671500@????.?????.???>
Content-Type: text/plain; charset=UTF-8
Don't forget your SDR could be off by a few parts per million in frequency
if you haven't calibrated it to a known frequency source.? At 435 MHz, being
off by 3 parts per million would translate to a 3*435 =1305 Hz or 1.305 KHz
offset from the actual intended frequency of reception.
Jay F. CoxKG5BZW
"Knowledge can only exist if doubt is possible."? -- stolen from an
amazon.com review of "On Certainty:" by by Ludwig Wittgenstein.
On Tuesday, July 10, 2018, 1:43:09 PM CDT, Alan <wa4sca@?????.???> wrote:
Umesh,
There are two primary satellite issues.? First, the published frequencies
are usually nominal values obtained during ground checkout. Over time due to
normal component aging, radiation, loss of voltage regulation, etc they can
drift.?
The second is the temperature effect you mentioned.? You will find that the
beacon and transponder calibration will change slightly with the spacecraft
temperature as it goes through periods of eclipse and full illumination.
There is also a slight seasonal shift which you can see.? This is most
prominent in CubeSats which have very little thermal inertia.? Also, the are
tradeoffs to be made in terms of power consumption, radiation resistance,
and performance.? AO-7 also drifts due to the lack of a battery to stabilize
the voltage.?
Another issue is your station computer clock.? They can drift rather badly,
and the operating system may not do a very good job of syncing them with a
reliable time standard.? There are some free programs which do an excellent
job available.
73,
Alan
WA4SCA
<-----Original Message-----
<From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of
<k6vug@?????????.???
<Sent: Tuesday, July 10, 2018 12:28 PM
<To: AMSAT BB <amsat-bb@?????.???>
<Subject: [amsat-bb] Trying to understand downlink corrections
<
<Greetings,
<I have been using a SDR dongle to receive the downlinks of SSB satellites.
The
<combination of SatPC32's Downlink Correction feature and the SDR's visual
<display helps to zero beat the CW beacon exceptionally well.? The Lat/Lon
is
<good to 6 decimals.? However, I find that the downlink correction needed
is
<quite different for different satellites. Could it be due to rounding off
errors or
<due to temperature variations at the satellite itself ??? Maybe this has
been
<explained earlier, but I wonder why ?
<
<Obviously, the more I learn, shows how less I know...? Thanks for any
pointers
<!
<
<73!
<Umesh
<k6vug
<
<_______________________________________________
<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: Tue, 10 Jul 2018 12:58:20 -0700
From: W3AB/GEO <w3ab@?????.???>
To: Jay Cox <sqrtofone@?????.???>
Cc: W3AB/GEO via AMSAT-BB <amsat-bb@?????.???>, APBIDDLE@???????.???
Subject: Re: [amsat-bb] Trying to understand downlink corrections
Message-ID: <911bf7e6-7f79-408a-b10e-0ed8f6df5819@?????.???>
Content-Type: text/plain; charset=UTF-8
Umesh,
Are you asking about doppler corrections that must be made during the
operation or a fixed frequency before you start?
?___
Sent from my two way wrist watch
73 de W3AB/GEO?
On Jul 10, 2018, 12:43, at 12:43, Jay Cox via AMSAT-BB <amsat-bb@?????.???>
wrote:
>Don't forget your SDR could be off by a few parts per million in
>frequency if you haven't calibrated it to a known frequency source.? At
>435 MHz, being off by 3 parts per million would translate to a 3*435
>=1305 Hz or 1.305 KHz offset from the actual intended frequency of
>reception.
>Jay F. CoxKG5BZW
>"Knowledge can only exist if doubt is possible."? -- stolen from an
>amazon.com review of "On Certainty:" by by Ludwig Wittgenstein.
>
>On Tuesday, July 10, 2018, 1:43:09 PM CDT, Alan <wa4sca@?????.???>
>wrote:
>
> Umesh,
>
>There are two primary satellite issues.? First, the published
>frequencies
>are usually nominal values obtained during ground checkout. Over time
>due to
>normal component aging, radiation, loss of voltage regulation, etc they
>can
>drift.?
>
>The second is the temperature effect you mentioned.? You will find that
>the
>beacon and transponder calibration will change slightly with the
>spacecraft
>temperature as it goes through periods of eclipse and full
>illumination.
>There is also a slight seasonal shift which you can see.? This is most
>prominent in CubeSats which have very little thermal inertia.? Also,
>the are
>tradeoffs to be made in terms of power consumption, radiation
>resistance,
>and performance.? AO-7 also drifts due to the lack of a battery to
>stabilize
>the voltage.?
>
>Another issue is your station computer clock.? They can drift rather
>badly,
>and the operating system may not do a very good job of syncing them
>with a
>reliable time standard.? There are some free programs which do an
>excellent
>job available.
>
>73,
>
>Alan
>WA4SCA
>
>
>
>
><-----Original Message-----
><From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of
><k6vug@?????????.???
><Sent: Tuesday, July 10, 2018 12:28 PM
><To: AMSAT BB <amsat-bb@?????.???>
><Subject: [amsat-bb] Trying to understand downlink corrections
><
><Greetings,
><I have been using a SDR dongle to receive the downlinks of SSB
>satellites.
>The
><combination of SatPC32's Downlink Correction feature and the SDR's
>visual
><display helps to zero beat the CW beacon exceptionally well.? The
>Lat/Lon
>is
><good to 6 decimals.? However, I find that the downlink correction
>needed
>is
><quite different for different satellites. Could it be due to rounding
>off
>errors or
><due to temperature variations at the satellite itself ??? Maybe this
>has
>been
><explained earlier, but I wonder why ?
><
><Obviously, the more I learn, shows how less I know...? Thanks for any
>pointers
><!
><
><73!
><Umesh
><k6vug
><
><_______________________________________________
><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: 6
Date: Tue, 10 Jul 2018 21:36:29 +0000 (UTC)
From: "k6vug@?????????.???? <k6vug@?????????.???>
To: Jay Cox <sqrtofone@?????.???>, W3AB/GEO <w3ab@?????.???>
Cc: W3AB/GEO via AMSAT-BB <amsat-bb@?????.???>, APBIDDLE@???????.???
Subject: Re: [amsat-bb] Trying to understand downlink corrections
Message-ID: <9976008.2359525.1531258589486@????.?????.???>
Content-Type: text/plain; charset=UTF-8
A big thank you for all the replies !?
?
W3AB/GEO,
Just to clarify, SatPC32 has the latest TLEs and does all the work during
the pass. However, at AOS I have to apply a small correction to the downlink
frequency (via SatPC32's feature) in order to zero beat the CW beacon. After
that, it tracks nicely throughout the pass. So my question was (a) why do I
need the correction and (b) why is the correction different for different
satellites.
?
Jay,
Thanks, I did calibrate it as much as SDRsharp would allow and it seems to
be dead-on for ground VHF transmissions.? Assuming it was still off by a
little, I thought it would be off by the same amount for all satellites.
?
Alan,
Thanks for the detailed explanation, the temperature based drift was my
first guess due to the size limitations. I had not thought of the component
degradation and esp., seasonal changes and the PC clock.??
?
Pedro,
Thanks for the TLE updating tip.? I guess TLEs change to keep up with orbit
drift, etc. right??
?
Again, thanks everyone, this is fascinating and it looks like there is no
way to "Set-it-and-Forget-it"...?
So, for now, I'm making a list of downlink corrections for the satellites
that I'm playing with and that have a CW beacon.?
Some day, if I get my hands on some SDR code I may look into adding
auto-zero-beat like FLDIGI or DM780 or CWGET.
?
?
Best 73s,
Umesh
k6vug
?
On Tuesday, July 10, 2018, 12:59:21 PM PDT, W3AB/GEO <w3ab@?????.???>
wrote:
Umesh,
Are you asking about doppler corrections that must be made during the
operation or a fixed frequency before you start?
___
Sent from my two way wrist watch
73 de W3AB/GEOOn Jul 10, 2018, at 12:43, Jay Cox via AMSAT-BB
<amsat-bb@?????.???> wrote:
Don't forget your SDR could be off by a few parts per million in frequency
if you haven't calibrated it to a known frequency source.? At 435 MHz, being
off by 3 parts per million would translate to a 3*435 =1305 Hz or 1.305 KHz
offset from the actual intended frequency of reception.
Jay F. CoxKG5BZW
"Knowledge can only exist if doubt is possible."? -- stolen from an
amazon.com review of "On Certainty:" by by Ludwig Wittgenstein.
On Tuesday, July 10, 2018, 1:43:09 PM CDT, Alan <wa4sca@?????.???> wrote:
Umesh,
There are two primary satellite issues.? First, the published frequencies
are usually nominal values obtained during ground checkout. Over time due to
normal component aging, radiation, loss of voltage regulation, etc they can
drift.?
The second is the temperature effect you mentioned.? You will find that the
beacon and transponder calibration will change slightly with the spacecraft
temperature as it goes through periods of eclipse and full illumination.
There is also a slight seasonal shift which you can see.? This is most
prominent in CubeSats which have very little thermal inertia.? Also, the are
tradeoffs to be made in terms of power consumption, radiation resistance,
and performance.? AO-7 also drifts due to the lack of a battery to stabilize
the voltage.?
Another issue is your station computer clock.? They can drift rather badly,
and the operating system may not do a very good job of syncing them with a
reliable time standard.? There are some free programs which do an excellent
job available.
73,
Alan
WA4SCA
<-----Original Message-----
<From: AMSAT-BB [mailto:amsat-bb-bounces@?????.???? On Behalf Of
<k6vug@?????????.???
<Sent: Tuesday, July 10, 2018 12:28 PM
<To: AMSAT BB <amsat-bb@?????.???>
<Subject: [amsat-bb] Trying to understand downlink corrections
<
<Greetings,
<I have been using a SDR dongle to receive the downlinks of SSB satellites.
The
<combination of SatPC32's Downlink Correction feature and the SDR's visual
<display helps to zero beat the CW beacon exceptionally well.? The Lat/Lon
is
<good to 6 decimals.? However, I find that the downlink correction needed
is
<quite different for different satellites. Could it be due to rounding off
errors or
<due to temperature variations at the satellite itself ??? Maybe this has
been
<explained earlier, but I wonder why ?
<
<Obviously, the more I learn, shows how less I know...? Thanks for any
pointers
<!
<
<73!
<Umesh
<k6vug
<
<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: Tue, 10 Jul 2018 18:00:40 -0400
From: Jim Sanford <wb4gcs@??????.???>
To: 'Amsat - BBs' <amsat-bb@?????.???>
Subject: [amsat-bb] WARNING -- PHISHING masquerading as amsat.org
Message-ID: <bad0bd06-1753-e503-1ca6-af4a6358c466@??????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
All:
Just deleted a phishing email which purported to be from the webmaster
-- my account is full and will be deleted unless I clicked a link, which
did NOT go to amsat.org.
Beware!
73,
Jim
wb4gcs@?????.???
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
------------------------------
Message: 8
Date: Wed, 11 Jul 2018 08:39:04 -0400
From: <kb2mjeff@???.???>
To: "Amsat" <amsat-bb@?????.???>
Subject: [amsat-bb] Spid RAS rotor issue
Message-ID: <3DB30F5F5E06481AA164CA98F61C9D8A@???????>
Content-Type: text/plain; format=flowed; charset="utf-8";
reply-type=original
Looks like the elevation up relay is fried in my RAS controller box. I'm
going to take Harald's advice and replace all 4. Before I order the parts
has anyone else experienced a relay failure with their RAS? If so what relay
did you replace it with, make, part # ?
I'm at this time running the controller and rotor at 13.8 volts, was going
to try 28 volts to the rotor with the Spid approved mod, but now not so sure
:-)
73 Jeff kb2m
-----Original Message-----
From: Harald
Sent: Tuesday, July 10, 2018 7:07 PM
To: kb2mjeff@???.???
Subject: Re: [amsat-bb] Spid RAS rotor issue
Hello Kb2m jeff,
I don't know if you have ELFA over there but from elfa the part
nr. is PCB power relay 12VDC 400mW 137-44-376.
It is more or less a standard relay.
They are a littel bit hard to get out of the pcb but I used
solder sucking wick as they called it, you may have to resolder
some points to get it totally free.
Not too much heat, ,,,,take some breaks :-)
good luck in finding them.
Harald
la7qta
Wednesday, July 11, 2018, 12:34:25 AM, you wrote:
> Hi Harald. thank you for the reply. I'm sure my control box has a failed
> relay also. I hear a faint click when going both ways in azimuth, but only
> hear a click on down elevation. So I'm sure the up elevation relay is
> defective. I'm going to take your advice and swap out all four relays.
> Would
> you be so kind to give me a part number and a source of the relays you
> replaced with. Thanks in advance....
> 73 Jeff kb2m
> -----Original Message-----
> From: Harald
> Sent: Tuesday, July 10, 2018 3:07 PM
> To: kb2mjeff@???.???
> Subject: Re: [amsat-bb] Spid RAS rotor issue
> Hello Kb2m jeff,
> I recently had the exact same problem but the rotor was running.
> To get it out of that position I took the plug out of the az
> conn. and put the conn. from ez into az and drove it all the way
> around again. they are equaly pinned. test which way you have to
> rotate with the az buttons,,,,(or connect 12v with the right
> polarity to the ez plug directly),,,,,,, much easyer to use the az conn.
> I replaced the 4 relays, zeroed the controller and all is working
> again.
> The relays are some cheap ones so the best is to change them
> anyway.
> I have used it for 3 years and had truble before with those.
> Hope this will help in solving your problems !
> Best 73's
> Harald
> LA7QTA
> PS: questions,,,just ask !
> Tuesday, July 10, 2018, 12:32:26 PM, you wrote:
>> I?m having a problem with my RAS rotor at my winter home. When I turned
>> it
>> on yesterday, after an absence of about 2 months the elevation went into
>> a
>> complete backflip when powered up, and is jammed against the roof with an
>> elevation reading of 195 degrees on the control box. I?m at my Florida
>> home for just a few weeks to do some fishing, so before starting to work
>> on it to maybe speed up the repair process a bit I?m asking here if
>> anyone
>> else had this problem. When the roof dries off I plan on going up there
>> and remove the antennas before trying to move the rotor, to diagnose.
>> Right now the azimuth will turn, but the elevation is stuck, it wont move
>> up or down. I?m hoping it is just jammed into the roof, once unstuck
>> hopefully all it would need is a re-calibration. Thanks for any useful
>> information....
>> 73 Jeff kb2m
---
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https://www.avg.com
------------------------------
Message: 9
Date: Wed, 11 Jul 2018 09:12:01 -0400
From: Dave Webb KB1PVH <kb1pvh@?????.???>
To: kb2m <kb2m@????.???>
Cc: AMSAT -BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Spid RAS rotor issue
Message-ID:
<CAEMY9Ff29n17ensd6wq4t_SJ-vY7OKWzEaabVV1WhZ26z0bTDQ@????.?????.???>
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Jeff,
I went through 2 Rot2Prog controllers in less than a year. The relays seem
to be a big problem. I bit the bullet and bought a Green Heron controller
and haven't had any problems.
Dave-KB1PVH
Sent from my Galaxy S9
On Wed, Jul 11, 2018, 8:43 AM <kb2mjeff@???.???> wrote:
> Looks like the elevation up relay is fried in my RAS controller box. I'm
> going to take Harald's advice and replace all 4. Before I order the parts
> has anyone else experienced a relay failure with their RAS? If so what
> relay
> did you replace it with, make, part # ?
>
> I'm at this time running the controller and rotor at 13.8 volts, was going
> to try 28 volts to the rotor with the Spid approved mod, but now not so
> sure
> :-)
>
> 73 Jeff kb2m
>
> -----Original Message-----
> From: Harald
> Sent: Tuesday, July 10, 2018 7:07 PM
> To: kb2mjeff@???.???
> Subject: Re: [amsat-bb] Spid RAS rotor issue
>
> Hello Kb2m jeff,
>
> I don't know if you have ELFA over there but from elfa the part
> nr. is PCB power relay 12VDC 400mW 137-44-376.
>
> It is more or less a standard relay.
>
> They are a littel bit hard to get out of the pcb but I used
> solder sucking wick as they called it, you may have to resolder
> some points to get it totally free.
> Not too much heat, ,,,,take some breaks :-)
>
> good luck in finding them.
>
> Harald
> la7qta
>
>
>
> Wednesday, July 11, 2018, 12:34:25 AM, you wrote:
>
>
> > Hi Harald. thank you for the reply. I'm sure my control box has a failed
> > relay also. I hear a faint click when going both ways in azimuth, but
> only
> > hear a click on down elevation. So I'm sure the up elevation relay is
> > defective. I'm going to take your advice and swap out all four relays.
> > Would
> > you be so kind to give me a part number and a source of the relays you
> > replaced with. Thanks in advance....
>
> > 73 Jeff kb2m
>
>
> > -----Original Message-----
> > From: Harald
> > Sent: Tuesday, July 10, 2018 3:07 PM
> > To: kb2mjeff@???.???
> > Subject: Re: [amsat-bb] Spid RAS rotor issue
>
> > Hello Kb2m jeff,
>
> > I recently had the exact same problem but the rotor was running.
> > To get it out of that position I took the plug out of the az
> > conn. and put the conn. from ez into az and drove it all the way
> > around again. they are equaly pinned. test which way you have to
> > rotate with the az buttons,,,,(or connect 12v with the right
> > polarity to the ez plug directly),,,,,,, much easyer to use the az conn.
>
> > I replaced the 4 relays, zeroed the controller and all is working
> > again.
>
> > The relays are some cheap ones so the best is to change them
> > anyway.
> > I have used it for 3 years and had truble before with those.
>
> > Hope this will help in solving your problems !
>
> > Best 73's
>
> > Harald
> > LA7QTA
>
> > PS: questions,,,just ask !
>
>
> > Tuesday, July 10, 2018, 12:32:26 PM, you wrote:
>
> >> I?m having a problem with my RAS rotor at my winter home. When I turned
> >> it
> >> on yesterday, after an absence of about 2 months the elevation went
> into
> >> a
> >> complete backflip when powered up, and is jammed against the roof with
> an
> >> elevation reading of 195 degrees on the control box. I?m at my Florida
> >> home for just a few weeks to do some fishing, so before starting to work
> >> on it to maybe speed up the repair process a bit I?m asking here if
> >> anyone
> >> else had this problem. When the roof dries off I plan on going up there
> >> and remove the antennas before trying to move the rotor, to diagnose.
> >> Right now the azimuth will turn, but the elevation is stuck, it wont
> move
> >> up or down. I?m hoping it is just jammed into the roof, once unstuck
> >> hopefully all it would need is a re-calibration. Thanks for any useful
> >> information....
>
> >> 73 Jeff kb2m
>
>
>
> ---
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Not an AMSAT member? Join now to support the amateur satellite program!
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End of AMSAT-BB Digest, Vol 13, Issue 244
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