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CX2SA > SATDIG 14.10.11 21:05l 680 Lines 24685 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: Which preamp to buy for 2m? (Stefan Wagener)
2. Re: Oscarlocator (andy thomas)
3. Re: Oscarlocator (jmfranke)
4. SRMVU 1138UTC pass at EN91ck (Carl Rimmer W8KRF)
5. Re: Oscarlocator, (K5OE)
6. Re: SRMVU 1138UTC pass at EN91ck (Lynn W. Deffenbaugh (Mr))
7. Re: SRMVU 1138UTC pass at EN91ck (Lynn W. Deffenbaugh (Mr))
8. Re: SRMVU 1138UTC pass at EN91ck (Mani VU2WMY)
9. Re: SRMVU 1138UTC pass at EN91ck (Mark L. Hammond)
10. SRMVU/JUGNU Keps (Carl Rimmer W8KRF)
11. Jugnu (JNU) : Thanks and Updates (Shashank Chintalagiri)
12. Re: G5500 Elevation Rotator Short Circuit? (gkcarr@xxxxxxxxxx.xxxx
----------------------------------------------------------------------
Message: 1
Date: Thu, 13 Oct 2011 16:11:11 -0500
From: Stefan Wagener <wageners@xxxxx.xxx>
To: Burns Fisher <burns@xxxxxx.xx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Which preamp to buy for 2m?
Message-ID:
<CAKu8kHDA4grAmeEgKHkAZ5E+Vh+8UBKA3BjS-MzQyrsG_3rbcA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
One of the best SSB alternatives is actually the preamps from HF-Berg
in Germany!
http://hf-berg.de/HFC/preisliste_amateurfunk.htm
You can contact them directly and they will ship it to you. The price
for their 2m preamp with VOX and protective housing is currently Euro
154. That's what you more or less will pay once they deduct the local
sales tax because you buy from the US and add shipping cost.
Don't worry about the website being in German they are very good in
getting back to you in English and their shipping is quick and
reliable and they take PayPal.
Hope this helps,
Stefan
On Thu, Oct 13, 2011 at 2:26 PM, Burns Fisher <burns@xxxxxx.xx> wrote:
> First, my sincere apologies...I think I managed to resend the entire digest
> to the list. ?I HATE it when people do that but now I know how easy it is to
> do accidentally. ?Sorry.
>
> ----
>
> Now to what I was going to say: ?I have the SSB SP-2000 and I'm also very
> happy with it. ?It seems to do auto RF switching well down to under 2
> watts. ?(Some auto-switching are only spec'ed to switch down to 8 or 10W).
> ?It also bypasses itself if you just cut the power (to be expected, I
> guess). ?I'm using it with a second power feedline (which you can connect
> with a PL259) since I don't happen to have 13.8V phantom power available.
> On the other hand, it is about the most expensive 2m preamp you can find :-(
>
> Where to get it in the US? ?ssbusa.com appears to be a distributer. ?No one
> answered the phone, and they never returned my call. ?Another vendor (take
> it from whence it came) said they were phasing out. ?But in any case, Array
> Solutions was very helpful and fast and sent me my SP-2000 in a very short
> time. ?As I recall I had to talk to them on the phone since they did not
> have the SSB stuff fully integrated into their web site yet, but it was
> worthwhile. ?Array Solutions also advertises in QST :-)
>
> Burns, W2BFJ
>
>
>
>
>
>> ?Message: 14
>> Date: Thu, 13 Oct 2011 10:19:24 -0400
>> From: "Stephen ?E. Belter" <seb@xxxxxx.xxx>
>> To: Tim Goodrich <tim@xxxxxxxxxxx.xxx>, "amsat-bb@xxxxx.xxxx
>> ? ? ? ?<amsat-bb@xxxxx.xxx>
>> Subject: [amsat-bb] Re: Which preamp to buy for 2m?
>> Message-ID:
>> ? ? ? ?<51668A33220E754EABE6583357ECEE2D79CD61B2@xxxxxxxx.xxxxxx.xxxxx>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> Tim,
>>
>> I own SSB preamps, the SP-2000 (2 meter) and SP-7000 (70 cm). ?They have
>> worked very well for me, both on my Icom IC-821 (powered by the radio) and
>> with my FUNcube Dongle (powered with an external bias-T from ARR). ?The SSB
>> preamps have helical filters on the front end which should help in your Los
>> Angeles RF environment.
>>
>> You have at least four sources for the SSB preamp:
>>
>> 1. ?Direct from SSB in Germany, www.ssb.de
>>
>> 2. ?From SSB-Electronics USA, www.ssbusa.com
>>
>> 3. ?From Array Solutions, www.arraysolutions.com
>>
>> 4. ?From Universal Radio, www.universal-radio.com
>>
>> 73, Steve N9IP
>> --
>>
>> -----Original Message-----
>> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
>> Behalf Of Tim Goodrich
>> Sent: Thursday, October 13, 2011 2:04 AM
>> To: amsat-bb@xxxxx.xxx
>> Subject: [amsat-bb] Which preamp to buy for 2m?
>>
>> Hi all,
>>
>> I just got a M2 2M4 and 420-50-11 to mount on my az/el rotor and go with my
>> 736R. As I'm hoping to potentially work some EME with the big guns when
>> conditions are just right, I'm wondering if anyone can provide advice on
>> which preamp to get for 2m. I live in the Los Angeles metro area, so lots
of
>> noise/QRM, and also would like something to take advantage of the 736's
>> preamp switch/voltage over coax option. In other words, something that
>> doesn't require any complicated power/switching controls, if possible.
>>
>>
>>
>> Any suggestions?
>>
>>
>>
>> Thanks,
>>
>> Tim
>>
>> K6TW
>>
>>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 2
Date: Fri, 14 Oct 2011 12:34:34 +0100 (BST)
From: andy thomas <andythomasmail@xxxxx.xx.xx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Oscarlocator
Message-ID:
<1318592074.50148.YahooMailNeo@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
At the flea market in St Petersburg (Russia, not Fla!) this August?I bought
a Russian ex-ship "Oscarlocator"- type device for geostationary satellites
in the Inmarsat series.
?
It's a map of the world with the satellites marked on it along the equator,
and a transparent plastic overlay from which you can?read the az and el to
the satellite from your position. It rotaes around a central screw.
?
Obviously it'll work with any geostationary satellite once you have drawn it
in.
?
I have scanned all 3 components - map, overlay and Russian text - and
translated the text. I sent it to amsat-uk for their bulletin but?I don't
think they are interested. Maybe nobody is. But if anyone is, let me know
and I'll post it on my website.
?
73 de andy g0sfj
------------------------------
Message: 3
Date: Fri, 14 Oct 2011 07:57:34 -0400
From: "jmfranke" <jmfranke@xxx.xxx>
To: "andy thomas" <andythomasmail@xxxxx.xx.xx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Oscarlocator
Message-ID: <689B77C12D56466481F30521D1C0FA8A@xxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I would like to see it. I have a linear one from the US Navy. It has a
Mercator map with a transparent slide. You move the slide to the satellite
longitude position, find your position through the transparency, and then
read the elevation and azimuth angle from the slide markings.
John WA4WDL
--------------------------------------------------
From: "andy thomas" <andythomasmail@xxxxx.xx.xx>
Sent: Friday, October 14, 2011 7:34 AM
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Oscarlocator
> At the flea market in St Petersburg (Russia, not Fla!) this August I
> bought a Russian ex-ship "Oscarlocator"- type device for geostationary
> satellites in the Inmarsat series.
>
> It's a map of the world with the satellites marked on it along the
> equator, and a transparent plastic overlay from which you can read the az
> and el to the satellite from your position. It rotaes around a central
> screw.
>
> Obviously it'll work with any geostationary satellite once you have drawn
> it in.
>
> I have scanned all 3 components - map, overlay and Russian text - and
> translated the text. I sent it to amsat-uk for their bulletin but I don't
> think they are interested. Maybe nobody is. But if anyone is, let me know
> and I'll post it on my website.
>
> 73 de andy g0sfj
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 4
Date: Fri, 14 Oct 2011 08:10:39 -0400
From: Carl Rimmer W8KRF <w8krf@xxxxx.xxx>
To: amsat-bb@xxxxx.xxxx Dinesh Cyanam KC2YQJ <dinesh@xxxxxx.xxx>,
Sanjay Srikanth Nekkanti AB3OE <sanjaynekkanti@xxxxx.xxx>
Subject: [amsat-bb] SRMVU 1138UTC pass at EN91ck
Message-ID: <4E9826BF.70103@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
SRMVU CW Telemetry: SRMVU C Z Z P P C
Note: The AOS/LOS are almost 2 minutes off now. I have also noticed an
upward shift in the frequency. I am receiving it at 435.426+. I am
also having to adjust Doppler more often. Is this a side effect of the
Keps being off? Will you be posting updated Keps?
--
*Carl W8KRF*
------------------------------
Message: 5
Date: Fri, 14 Oct 2011 09:06:33 -0400 (EDT)
From: K5OE <k5oe@xxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Oscarlocator,
Message-ID: <8CE58893B938275-14C4-3BDFD@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Here's one:
http://www.ebay.com/itm/Mechanical-Paper-Oscar-Locator-Amateur-Satellite-1983-
Second-Revision-/120793567902?pt=LH_DefaultDomain_0&hash=item1c1fdb929e
73,
Jerry, K5OE
------------------------------
Message: 6
Date: Fri, 14 Oct 2011 09:14:46 -0400
From: "Lynn W. Deffenbaugh (Mr)" <ldeffenb@xxxxxxxx.xx>
To: Carl Rimmer W8KRF <w8krf@xxxxx.xxx>
Cc: Sanjay Srikanth Nekkanti AB3OE <sanjaynekkanti@xxxxx.xxx>,
amsat-bb@xxxxx.xxxx Dinesh Cyanam KC2YQJ <dinesh@xxxxxx.xxx>
Subject: [amsat-bb] Re: SRMVU 1138UTC pass at EN91ck
Message-ID: <4E9835C6.4060606@xxxxxxxx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
http://celestrak.com/NORAD/elements/tle-new.txt includes the following
objects:
2011-058A, 2011-058B, 2011-058C, 2011-058D, 2011-058E
Does anyone know which of these (if any) is the actual SRMVU?
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
On 10/14/2011 8:10 AM, Carl Rimmer W8KRF wrote:
> SRMVU CW Telemetry: SRMVU C Z Z P P C
>
> Note: The AOS/LOS are almost 2 minutes off now. I have also noticed
> an upward shift in the frequency. I am receiving it at 435.426+. I
> am also having to adjust Doppler more often. Is this a side effect of
> the Keps being off? Will you be posting updated Keps?
------------------------------
Message: 7
Date: Fri, 14 Oct 2011 09:15:21 -0400
From: "Lynn W. Deffenbaugh (Mr)" <ldeffenb@xxxxxxxx.xx>
To: Carl Rimmer W8KRF <w8krf@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: SRMVU 1138UTC pass at EN91ck
Message-ID: <4E9835E9.4000407@xxxxxxxx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Can you help a satellite newbie here? I tried to monitor for any sounds
during a pass last night, but heard nothing on or around the specified
frequency. However, my iCom 706 was in FM mode when I tried this and
watching the one video posted, I noted the CW mode on the display.
Can anyone help me with the iCom 706 settings to be able to hear a
pass? Then I can work with the Signalink and other software to attempt
to decode the CW telemetry. One of these days I'll try to learn code,
if nothing else, I'll try writing down the dots/dits and dashes/dahs and
try manually decoding it after the pass.
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
On 10/14/2011 8:10 AM, Carl Rimmer W8KRF wrote:
> SRMVU CW Telemetry: SRMVU C Z Z P P C
>
> Note: The AOS/LOS are almost 2 minutes off now. I have also noticed
> an upward shift in the frequency. I am receiving it at 435.426+. I
> am also having to adjust Doppler more often. Is this a side effect of
> the Keps being off? Will you be posting updated Keps?
------------------------------
Message: 8
Date: Fri, 14 Oct 2011 19:12:20 +0530
From: Mani VU2WMY <wmy@xxxx.xxx.xx>
To: "Lynn W. Deffenbaugh (Mr)" <ldeffenb@xxxxxxxx.xx>
Cc: Carl Rimmer W8KRF <w8krf@xxxxx.xxx>, Sanjay Srikanth Nekkanti
AB3OE <sanjaynekkanti@xxxxx.xxx>, amsat-bb@xxxxx.xxxx Dinesh Cyanam
KC2YQJ <dinesh@xxxxxx.xxx>
Subject: [amsat-bb] Re: SRMVU 1138UTC pass at EN91ck
Message-ID: <201110141342.p9EDgbOv038150@xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; DelSp="Yes"; format="flowed"
Dear OM,
As per our keps, object B very closely matches to SRMsat and the
object D is Jugnu.
73 de
Mani VU2WMY
Quoting "Lynn W. Deffenbaugh (Mr)" <ldeffenb@xxxxxxxx.xx>:
> http://celestrak.com/NORAD/elements/tle-new.txt includes the
> following objects:
>
> 2011-058A, 2011-058B, 2011-058C, 2011-058D, 2011-058E
>
> Does anyone know which of these (if any) is the actual SRMVU?
>
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
>
> On 10/14/2011 8:10 AM, Carl Rimmer W8KRF wrote:
>> SRMVU CW Telemetry: SRMVU C Z Z P P C
>>
>> Note: The AOS/LOS are almost 2 minutes off now. I have also
>> noticed an upward shift in the frequency. I am receiving it at
>> 435.426+. I am also having to adjust Doppler more often. Is this
>> a side effect of the Keps being off? Will you be posting updated
>> Keps?
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
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------------------------------
Message: 9
Date: Fri, 14 Oct 2011 09:52:41 -0400
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
To: "Lynn W. Deffenbaugh (Mr)" <ldeffenb@xxxxxxxx.xx>
Cc: Carl Rimmer W8KRF <w8krf@xxxxx.xxx>, Sanjay Srikanth Nekkanti
AB3OE <sanjaynekkanti@xxxxx.xxx>, amsat-bb@xxxxx.xxxx Dinesh Cyanam
KC2YQJ <dinesh@xxxxxx.xxx>
Subject: [amsat-bb] Re: SRMVU 1138UTC pass at EN91ck
Message-ID:
<CAPRXzyqUbzyytLvssjiF8S7nm3ZqcMqKrg879vJcS0OCSmbisg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I suggest you try Object "B" for now...it seems to work fairly well
with both satellites. Load them all into your tracking
program--you'll see they are close right now.
For your IC-706....use either USB or CW is my suggestion...whichever
you find to work best.
73,
Mark N8MH
On Fri, Oct 14, 2011 at 9:14 AM, Lynn W. Deffenbaugh (Mr)
<ldeffenb@xxxxxxxx.xx> wrote:
> http://celestrak.com/NORAD/elements/tle-new.txt includes the following
> objects:
>
> 2011-058A, 2011-058B, 2011-058C, 2011-058D, 2011-058E
>
> Does anyone know which of these (if any) is the actual SRMVU?
>
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
>
> On 10/14/2011 8:10 AM, Carl Rimmer W8KRF wrote:
>>
>> SRMVU CW Telemetry: ?SRMVU C Z Z P P C
>>
>> Note: ?The AOS/LOS are almost 2 minutes off now. ?I have also noticed an
>> upward shift in the frequency. ?I am receiving it at 435.426+. ?I am also
>> having to adjust Doppler more often. ?Is this a side effect of the Keps
>> being off? ?Will you be posting updated Keps?
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
--
Mark L. Hammond [N8MH]
------------------------------
Message: 10
Date: Fri, 14 Oct 2011 12:37:44 -0400
From: Carl Rimmer W8KRF <w8krf@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] SRMVU/JUGNU Keps
Message-ID: <4E986558.4090604@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I have been looking at Catalog numbers 37838U through 37842U and with no
scientific or mathematical reason, but rather practicality, I am using
37841U for SRMVU and 37842U for JUGNU keps. When I used 37841U
(2011-058D) during the last pass of SRMVU, I was just about right on
with AOS/LOS times. However, all of that series are with in a minute or
so. Just my observation. There is another pass coming up in 28 minutes
so I will see how accurate I am again. I have all five showing in SatPC.
73,
--
*Carl W8KRF*
------------------------------
Message: 11
Date: Fri, 14 Oct 2011 22:15:49 +0530
From: Shashank Chintalagiri <shashank.chintalagiri@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Jugnu (JNU) : Thanks and Updates
Message-ID:
<CALT8Ef49SzYJZrZ+AiTezCyc6VTbxCVvY1GCx==dMWXBpJ48VA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hello,
I'm the system engineer for the Jugnu nanosatellite project. This is the
nanosatellite which is more generally known on this list as JNU, since that
was the identifier sent along with the TLE. I've been lurking on this list
for the past couple of years, ever since we started working on the
nanosatellite. I did learn a lot from occasionally perusing through the
posts here. Not being a licensed HAM myself, I apologize for intruding into
your space here today.
On behalf of the entire Jugnu team, I'd like to thank all of you for the
beacon reports you've sent our way, both on the list as well as through Mani
(VU2WMY). Its been a long couple of years on the project, but the last few
days have been a much more intense roller coaster ride. The continuous
stream of beacon reports from across the world surpassed all of our
expectations, and were the mainstay of our emotional support while we were
having difficulties recieving the beacon ourselves. If I do get to meet any
of you in person, the beer's on me.
The telemetry gathered by HAMs across the world has been extremely useful in
our analysis of the spacecraft's condition. I hope to be able to release,
atleast partially, the details of the format for the beacon string in a
couple of days. In the meanwhile, we welcome any additional telemetry that
you can send our way. Even information about the AOS/LOS has been very
useful in trying to figure out where exactly the satellite is.
NORAD / celestrak has released 5 TLE's tagged with the PSLV C-18 launch
(2011-058<A-E>). We arent yet sure which one, if any, is Jugnu. We do know
that SRMSat is one of the cluster of 3 objects (B,C,D). We've been able to
recieve our beacon when we attempt to track C, but the signal strength is
low and we generally see it clearly only near AOS. Due to reasons I'm
probably not allowed to discuss in public, we have reason to believe that
Jugnu is moving away from the other objects (SRMSat, VesselSat, and until
later today, MT) at a velocity of approximately 1.5 to 3 meters per second
since separation from LV. We expect this velocity to be tangential to the
orbit. If you're trying to track Jugnu, I would suggest that for the moment,
C is a good starting point, and it may be better to track a little ahead of
it. We will be trying to do the same in some of the later passes ourselves.
In the case of SRMSat, we've had good signals at object B until earlier
today, but we think that C did a better job of it in the last decent pass we
had earlier this evening, about 6 hours ago.
I'd be more than delighted to try and answer any questions you may have
about Jugnu, so please feel free to contact me on or off list if you would
like to know more about it.
Thanks and Regards,
Chintalagiri Shashank
Head, System Integration and Electronic Hardware Design,
Jugnu Nanosatellite Project
Indian Institute of Technology, Kanpur
http://blog.chintal.in
------------------------------
Message: 12
Date: Fri, 14 Oct 2011 12:40:05 -0500 (CDT)
From: gkcarr@xxxxxxxxxx.xxx
To: "Tim Cunningham" <n8deu@xxx.xxx>
Cc: clive@xxxxx.xx.xxx amsat <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: G5500 Elevation Rotator Short Circuit?
Message-ID: <1318614005.302120827@xxxxxxx.xxxxxxxxx.xx>
Content-Type: text/plain;charset=UTF-8
The az on my 5500 quit working abruptly lst week. Disgnosis was fairly easy.
I went out side and noted that the xyl had cut the az cable with the ztr.
73
George
WA5KBH
-----Original Message-----
From: "Tim Cunningham" <tim_cunningham@xxxxxxx.xxx>
Sent: Thursday, October 13, 2011 15:46
To: clive@xxxxx.xx.xxx "amsat" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: G5500 Elevation Rotator Short Circuit?
All of the failures were specifically attributed to either a stuck relay in
the control box, a manual switch sticking (not releasing) on the front rotor
control panel, and a software or computer crash that continued to drive one
of the up, down, left, or right control lines.
73,
Tim - N8DEU
----- Original Message -----
From: "Clive Wallis" <list1@xxxxx.xx.xx>
To: "amsat" <amsat-bb@xxxxx.xxx>
Sent: Sunday, October 09, 2011 11:50 AM
Subject: [amsat-bb] Re: G5500 Elevation Rotator Short Circuit?
Many thanks Tim for your comments. From what you've said it sounds like
a faulty motor. In the ones you've repaired have you been able to
determine the cause of motor over heating?
The problems I've had in the past have always been due to water getting
into the units.
73 Clive G3CWV
Hitchin, North Hertfordshire, UK
On 07/10/2011 18:50, Tim Cunningham wrote:
> The common failure of the motor windings is caused by heat which
> causes the enamel coated wire to breakdown. When the enamel breaks
> down an inner winding short results.
>
> I have successfully rewound motor windings on these rotators just to
> say it could be done, but it takes some work (not recommended).
>
> I have never seen one of these motors with an open winding. The
> failure mode on the 8 that I have repaired were always enamel
> insulation breakdown as a result of overheating.
>
>
> Tim - N8DEU
>
>
> Sent from my HTC Tilt? 2, a Windows? Mobile phone
>
> -----Original Message----- From: Clive Wallis<amsat-bb@xxxxx.xx.xx>
> Sent: Friday, October 07, 2011 11:35 AM To:
> amsat<amsat-bb@xxxxx.xxx> Subject: [amsat-bb] G5500 Elevation Rotator
> Short Circuit?
>
> I wonder if this is a known fault. Recently the fuse on my G5500
> blew. The problem seems to be a short on one of the motor
> circuits.
>
> Checking the DC resistance at the control end, the resistance of one
> winding is 1.2 ohms, whereas all the other windings are 4.6 ohms.
>
> I could understand a motor burning out and going open circuit, but
> a short circuit seems less likely. I'm wondering if it could be a
> short on the cable at the rotator end, where it is subject to much
> bending. There's about 15 metres of cable.
>
> Any thoughts would be much appreciated. Unfortunately, at the
> present time I'm not able to inspect the rotator. It's stuck in the
> horizontal position, so I will still be able to use the antenna for
> low elevation passes.
>
> 73 Clive G3CWV
>
> Hitchin, North Hertfordshire, UK
> _______________________________________________ Sent via
> AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author. Not
> an AMSAT-NA member? Join now to support the amateur satellite
> program! Subscription settings:
> http://amsat.org/mailman/listinfo/amsat-bb
>
>
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End of AMSAT-BB Digest, Vol 6, Issue 569
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