Hi All,
Er there station making qso's on DO-64? Last 2 weeks I tried serveal times but I can't hear my signal on the transponder. It looks like the transponder receiver is not working. I can hear the beacon and transponder noise very well.
73 Rob PE1ITR http://www.pe1itr.com
Hi Rob,
I agree. Today morning I tried at 08:02 - 08:10Z, Orbit #2252, excellent pass for my location.
As you pointed out, I also heard the beacon with a true 559 on CW (Hi Hi DELFI-C3), however it was impossible to access the transponder.
So, your note is correct.
73, Mak SV1BSX
----- Original Message ----- From: "Rob Hardenberg PE1ITR" rob@itr-datanet.com To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:13 AM Subject: [amsat-bb] Status DO-64?
Hi All,
Er there station making qso's on DO-64? Last 2 weeks I tried serveal times but I can't hear my signal on the transponder. It looks like the transponder receiver is not working. I can hear the beacon and transponder noise very well.
73 Rob PE1ITR http://www.pe1itr.com
Sent via AMSAT-BB@amsat.org. 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
Hi Mak and Rob, I just had a pass here over Copenhagen with max elevation of 86 degrees. I were able to hear myself using 70 W to my normal 2x19 element antenna - but very faint. I also heard a CW station. Conclusion - it is on but very difficult to use unless you have a lot of power for the uplink (more than I have). Have a nice weekend all 73 OZ1MY Ib ----- Original Message ----- From: "SV1BSX" sv1bsx@yahoo.gr To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:33 AM Subject: [amsat-bb] Re: Status DO-64?
Hi Rob,
I agree. Today morning I tried at 08:02 - 08:10Z, Orbit #2252,
excellent
pass for my location.
As you pointed out, I also heard the beacon with a true 559 on CW (Hi Hi DELFI-C3), however it was impossible to access the transponder.
So, your note is correct.
73, Mak SV1BSX
----- Original Message ----- From: "Rob Hardenberg PE1ITR" rob@itr-datanet.com To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:13 AM Subject: [amsat-bb] Status DO-64?
Hi All,
Er there station making qso's on DO-64? Last 2 weeks I tried serveal
times
but I can't hear my signal on the transponder. It looks like the transponder receiver is not working. I can hear the beacon and transponder noise very well.
73 Rob PE1ITR http://www.pe1itr.com
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite
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Hi Ib,
tks for reply and informative note. However I wondering about the DO-64 ! If you "shoot" the satellite with 2x19 el and 70 W, I suppose the ERP from a similar system is 2-3 KWatts. In case you had not easy access to satellite with this power, I wondering what is changed, as I remember that during the first weeks of transponder's activation the satellite was accessible, even if somebody was using 200-300 Watts ERP (that is my max power and I managed a lot of QSOs).
Anyway, too bad if the satellite-uplink is not enough sensitive any longer. I can't imagine ....5-10 KW ERP uplink-power for a good enough access. This way is a non-usable object for the majority of amateur satellite operators.
73, Mak SV1BSX
----- Original Message ----- From: "OZ1MY" oz1my@privat.dk To: "SV1BSX" sv1bsx@yahoo.gr; amsat-bb@amsat.org Cc: rob@itr-datanet.com Sent: Saturday, September 27, 2008 12:46 PM Subject: Re: [amsat-bb] Re: Status DO-64?
Hi Mak and Rob, I just had a pass here over Copenhagen with max elevation of 86 degrees. I were able to hear myself using 70 W to my normal 2x19 element antenna - but very faint. I also heard a CW station. Conclusion - it is on but very difficult to use unless you have a lot of power for the uplink (more than I have). Have a nice weekend all 73 OZ1MY Ib ----- Original Message ----- From: "SV1BSX" sv1bsx@yahoo.gr To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:33 AM Subject: [amsat-bb] Re: Status DO-64?
Hi Rob,
I agree. Today morning I tried at 08:02 - 08:10Z, Orbit #2252,
excellent
pass for my location.
As you pointed out, I also heard the beacon with a true 559 on CW (Hi Hi DELFI-C3), however it was impossible to access the transponder.
So, your note is correct.
73, Mak SV1BSX
----- Original Message ----- From: "Rob Hardenberg PE1ITR" rob@itr-datanet.com To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:13 AM Subject: [amsat-bb] Status DO-64?
Hi All,
Er there station making qso's on DO-64? Last 2 weeks I tried serveal
times
but I can't hear my signal on the transponder. It looks like the transponder receiver is not working. I can hear the beacon and transponder noise very well.
73 Rob PE1ITR http://www.pe1itr.com
Sent via AMSAT-BB@amsat.org. 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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Hi Mak, Yes I have made QSOs as well. Last time was 9th of September. In the start of the life of the transponder it was much easier.
I do not know what is different - but one thing could be the attitude of DO-64. If that is the course I would expect the effect to change from orbit to orbit ?
One thing that is sure is that it is on the receive side. Even without a preamplifier I can hear the noise floor of the transponder. May be something has gone wrong - only time will show.
Perhaps someone from Delfts knows ?
73 OZ1MY Ib ----- Original Message ----- From: "SV1BSX" sv1bsx@yahoo.gr To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 1:04 PM Subject: [amsat-bb] Re: Status DO-64?
Hi Ib,
tks for reply and informative note. However I wondering about the DO-64 ! If you "shoot" the satellite with 2x19 el and 70 W, I suppose the ERP from a similar system is 2-3 KWatts. In case you had not easy access to satellite with this power, I wondering what is changed, as I remember that during the first weeks of
transponder's
activation the satellite was accessible, even if somebody was using 200-300 Watts ERP (that is my max power and I managed a lot of QSOs).
Anyway, too bad if the satellite-uplink is not enough sensitive any
longer.
I can't imagine ....5-10 KW ERP uplink-power for a good enough access. This way is a non-usable object for the majority of amateur satellite operators.
73, Mak SV1BSX
----- Original Message ----- From: "OZ1MY" oz1my@privat.dk To: "SV1BSX" sv1bsx@yahoo.gr; amsat-bb@amsat.org Cc: rob@itr-datanet.com Sent: Saturday, September 27, 2008 12:46 PM Subject: Re: [amsat-bb] Re: Status DO-64?
Hi Mak and Rob, I just had a pass here over Copenhagen with max elevation of 86 degrees. I were able to hear myself using 70 W to my normal 2x19 element antenna - but very faint. I also heard a CW station. Conclusion - it is on but very difficult to use unless you have a lot of power for the uplink (more than I have). Have a nice weekend all 73 OZ1MY Ib ----- Original Message ----- From: "SV1BSX" sv1bsx@yahoo.gr To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:33 AM Subject: [amsat-bb] Re: Status DO-64?
Hi Rob,
I agree. Today morning I tried at 08:02 - 08:10Z, Orbit #2252,
excellent
pass for my location.
As you pointed out, I also heard the beacon with a true 559 on CW (Hi Hi DELFI-C3), however it was impossible to access the transponder.
So, your note is correct.
73, Mak SV1BSX
----- Original Message ----- From: "Rob Hardenberg PE1ITR" rob@itr-datanet.com To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:13 AM Subject: [amsat-bb] Status DO-64?
Hi All,
Er there station making qso's on DO-64? Last 2 weeks I tried serveal
times
but I can't hear my signal on the transponder. It looks like the transponder receiver is not working. I can hear the beacon and transponder noise very well.
73 Rob PE1ITR http://www.pe1itr.com
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Hi all,
The attitude of Delfi-C3 is changing slowly. The attitude with respect to your station defines the polarization of the up- and downlink signal, so this could lead to a change of polarization needed to uplink into Delfi. Please also try to uplink if the downlink seems weak, because the uplink might be very good at that time. Needless to say that when using circular polarized beams, you should be able to change between LHCP and RHCP, but the mentioned stations all have that capability to my knowledge.
When I get back to the Delfi-C3 groundstation I'll try a pass myself.
Regards,
Wouter Weggelaar PA3WEG Delfi-C3 Team
On Sat, Sep 27, 2008 at 2:12 PM, OZ1MY oz1my@privat.dk wrote:
Hi Mak, Yes I have made QSOs as well. Last time was 9th of September. In the start of the life of the transponder it was much easier.
I do not know what is different - but one thing could be the attitude of DO-64. If that is the course I would expect the effect to change from orbit to orbit ?
One thing that is sure is that it is on the receive side. Even without a preamplifier I can hear the noise floor of the transponder. May be something has gone wrong - only time will show.
Perhaps someone from Delfts knows ?
73 OZ1MY Ib ----- Original Message ----- From: "SV1BSX" sv1bsx@yahoo.gr To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 1:04 PM Subject: [amsat-bb] Re: Status DO-64?
Hi Ib,
tks for reply and informative note. However I wondering about the DO-64 ! If you "shoot" the satellite with 2x19 el and 70 W, I suppose the ERP from a similar system is 2-3 KWatts. In case you had not easy access to satellite with this power, I wondering what is changed, as I remember that during the first weeks of
transponder's
activation the satellite was accessible, even if somebody was using 200-300 Watts ERP (that is my max power and I managed a lot of QSOs).
Anyway, too bad if the satellite-uplink is not enough sensitive any
longer.
I can't imagine ....5-10 KW ERP uplink-power for a good enough access. This way is a non-usable object for the majority of amateur satellite operators.
73, Mak SV1BSX
----- Original Message ----- From: "OZ1MY" oz1my@privat.dk To: "SV1BSX" sv1bsx@yahoo.gr; amsat-bb@amsat.org Cc: rob@itr-datanet.com Sent: Saturday, September 27, 2008 12:46 PM Subject: Re: [amsat-bb] Re: Status DO-64?
Hi Mak and Rob, I just had a pass here over Copenhagen with max elevation of 86 degrees. I were able to hear myself using 70 W to my normal 2x19 element antenna - but very faint. I also heard a CW station. Conclusion - it is on but very difficult to use unless you have a lot of power for the uplink (more than I have). Have a nice weekend all 73 OZ1MY Ib ----- Original Message ----- From: "SV1BSX" sv1bsx@yahoo.gr To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:33 AM Subject: [amsat-bb] Re: Status DO-64?
Hi Rob,
I agree. Today morning I tried at 08:02 - 08:10Z, Orbit #2252,
excellent
pass for my location.
As you pointed out, I also heard the beacon with a true 559 on CW (Hi Hi DELFI-C3), however it was impossible to access the transponder.
So, your note is correct.
73, Mak SV1BSX
----- Original Message ----- From: "Rob Hardenberg PE1ITR" rob@itr-datanet.com To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:13 AM Subject: [amsat-bb] Status DO-64?
Hi All,
Er there station making qso's on DO-64? Last 2 weeks I tried serveal
times
but I can't hear my signal on the transponder. It looks like the transponder receiver is not working. I can hear the beacon and transponder noise very well.
73 Rob PE1ITR http://www.pe1itr.com
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program!
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The transponder noise is very audiable. I have listened (looked) to the transponder downlink with DSP waterfall and transmitted with 100w on the uplink. Not a trace of any signal. I don't think this is a polarisation matter. Normally 10w on the uplink is sufficient to get a solid signal on the downlink.
On september 15th I had a 57 signal from de DO-64 transponder and suddenly my signal disappeared. At the time beacon and transponder noise where still audiable. It looks like a problem with the receiver.
73 Rob PE1ITR
OZ1MY schreef:
Hi Mak, Yes I have made QSOs as well. Last time was 9th of September. In the start of the life of the transponder it was much easier.
I do not know what is different - but one thing could be the attitude of DO-64. If that is the course I would expect the effect to change from orbit to orbit ?
One thing that is sure is that it is on the receive side. Even without a preamplifier I can hear the noise floor of the transponder. May be something has gone wrong - only time will show.
Perhaps someone from Delfts knows ?
73 OZ1MY Ib ----- Original Message ----- From: "SV1BSX" sv1bsx@yahoo.gr To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 1:04 PM Subject: [amsat-bb] Re: Status DO-64?
Hi Ib,
tks for reply and informative note. However I wondering about the DO-64 ! If you "shoot" the satellite with 2x19 el and 70 W, I suppose the ERP from a similar system is 2-3 KWatts. In case you had not easy access to satellite with this power, I wondering what is changed, as I remember that during the first weeks of
transponder's
activation the satellite was accessible, even if somebody was using 200-300 Watts ERP (that is my max power and I managed a lot of QSOs).
Anyway, too bad if the satellite-uplink is not enough sensitive any
longer.
I can't imagine ....5-10 KW ERP uplink-power for a good enough access. This way is a non-usable object for the majority of amateur satellite operators.
73, Mak SV1BSX
----- Original Message ----- From: "OZ1MY" oz1my@privat.dk To: "SV1BSX" sv1bsx@yahoo.gr; amsat-bb@amsat.org Cc: rob@itr-datanet.com Sent: Saturday, September 27, 2008 12:46 PM Subject: Re: [amsat-bb] Re: Status DO-64?
Hi Mak and Rob, I just had a pass here over Copenhagen with max elevation of 86 degrees. I were able to hear myself using 70 W to my normal 2x19 element antenna - but very faint. I also heard a CW station. Conclusion - it is on but very difficult to use unless you have a lot of power for the uplink (more than I have). Have a nice weekend all 73 OZ1MY Ib ----- Original Message ----- From: "SV1BSX" sv1bsx@yahoo.gr To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:33 AM Subject: [amsat-bb] Re: Status DO-64?
Hi Rob,
I agree. Today morning I tried at 08:02 - 08:10Z, Orbit #2252,
excellent
pass for my location.
As you pointed out, I also heard the beacon with a true 559 on CW (Hi Hi DELFI-C3), however it was impossible to access the transponder.
So, your note is correct.
73, Mak SV1BSX
----- Original Message ----- From: "Rob Hardenberg PE1ITR" rob@itr-datanet.com To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:13 AM Subject: [amsat-bb] Status DO-64?
Hi All,
Er there station making qso's on DO-64? Last 2 weeks I tried serveal
times
but I can't hear my signal on the transponder. It looks like the transponder receiver is not working. I can hear the beacon and transponder noise very well.
73 Rob PE1ITR http://www.pe1itr.com
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program!
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Well I had been back on the birds for the last 3 months or so, and while I was getting ready for an AO-16 pass a few days ago, my elevation rotor on my Yaesu G-5400B stopped at about 10 degrees.
That's it. It won't go back down or up.
So I checked the wiring on the rotor, everything appeared fine. I removed the elevation rotor from the azimuthal, and took it inside. I made a small patch cord to go from the control box to the rotor, but no luck. All I get is the display of the elevation of about 10 degrees, and I hear a little hum when I attempt to move it up or down. This tells me that the potentiometer is probably good, and the motor is receiving power.
I've removed the small nameplate on the side, and there is no water inside, and I can see the ball bears; there doesn't appear to be any rust inside. I also removed the terminal assembly in case one of the wire had come loose, or had a cold solder joint, but I didn't find any problems there. Looking at the diagram of the rotor, there appears to only be a small 24 volt motor which turns this; along with numerous mechanical parts.
So the question is. Before I send this to Yaesu, has anyone had this problem before, is it a minor one (something that I could fix myself), or is best left to Yaesu? Before anyone mentions, Norm's no longer services these rotors. The four 'screws' that hold the two parts are impossible for me to loosen. I would have to use a vice, but I do have a friend with a motorcycle repair business who I'm sure could open it for me in 60 seconds. To me, this looks like a jigsaw puzzle by looking at the diagram.
The rotor was in service for about a couple of years back in the early 90s. It then sat inside without any use, up until a few months ago. If the consensus is to send it to Yaesu, should I bother to send in the azimuthal rotor, or should I follow the "don't fix it if it aint broken" rule?
Sebastian, I had a similar problem. In my case I found that the 24 volt motor had packed up. Since I had another Elevation Rotator with the faulty pot sitting on my bench for half a century, I swapped the motor and it worked. The motor is easily removed. Please remove the 4 screws that hold the motor and then try powering up and see if the motor works. I suppose you won't have a spare motor. I am trying to get the faulty motor rewired. Our local talent can do wonderful things.
You might consult Roy Welch who has a great knowledge on ailing Yaesu rotators. I am sure he has seen this mail and may have some valuable suggestions. Do share your experience if you manage to fix this problem.
Opening nuts is a big problem and your Motor Cycle workshop should be able to help. I got mine too opened that way.
73
Sangat, 9M2SS
2008/9/27 Sebastian w4as@bellsouth.net
Well I had been back on the birds for the last 3 months or so, and while I was getting ready for an AO-16 pass a few days ago, my elevation rotor on my Yaesu G-5400B stopped at about 10 degrees.
That's it. It won't go back down or up.
So I checked the wiring on the rotor, everything appeared fine. I removed the elevation rotor from the azimuthal, and took it inside. I made a small patch cord to go from the control box to the rotor, but no luck. All I get is the display of the elevation of about 10 degrees, and I hear a little hum when I attempt to move it up or down. This tells me that the potentiometer is probably good, and the motor is receiving power.
I've removed the small nameplate on the side, and there is no water inside, and I can see the ball bears; there doesn't appear to be any rust inside. I also removed the terminal assembly in case one of the wire had come loose, or had a cold solder joint, but I didn't find any problems there. Looking at the diagram of the rotor, there appears to only be a small 24 volt motor which turns this; along with numerous mechanical parts.
So the question is. Before I send this to Yaesu, has anyone had this problem before, is it a minor one (something that I could fix myself), or is best left to Yaesu? Before anyone mentions, Norm's no longer services these rotors. The four 'screws' that hold the two parts are impossible for me to loosen. I would have to use a vice, but I do have a friend with a motorcycle repair business who I'm sure could open it for me in 60 seconds. To me, this looks like a jigsaw puzzle by looking at the diagram.
The rotor was in service for about a couple of years back in the early 90s. It then sat inside without any use, up until a few months ago. If the consensus is to send it to Yaesu, should I bother to send in the azimuthal rotor, or should I follow the "don't fix it if it aint broken" rule? _______________________________________________ Sent via AMSAT-BB@amsat.org. 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
Hi Guys,
My two cents worth. It looks like Sebastian has made all of the checks. I assume the rotor will not move in either direction. It's possible that something had fallen into the gear train, jamming the works but it does sound more like a bad motor. Have you measured all of the voltages and especially the resistance values on the motor leads as shown in the owner's manual? If the resistances all look good and the supply voltages are good then I would check the resistance from each motor lead to the metal case to see if there is a short circuit to the rotor housing. I'm not sure but in some countries RFI hash protection has been added to the rotor circuitry consisting of small RF chokes and capacitors mounted inside the rotor case. For example, my Emoto rotors don't have it but the versions sold in some European countries do have it. You might check to see if there is a similar thing in your rotor and that there are no failures there. I doubt that this is the problem however. Good luck.
Roy -- W0SL
Sangat Singh wrote:
Sebastian,
I had a similar problem. In my case I found that the 24 volt motor had packed up. Since I had another Elevation Rotator with the faulty pot sitting on my bench for half a century, I swapped the motor and it worked. The motor is easily removed. Please remove the 4 screws that hold the motor and then try powering up and see if the motor works. I suppose you won't have a spare motor. I am trying to get the faulty motor rewired. Our local talent can do wonderful things.
You might consult Roy Welch who has a great knowledge on ailing Yaesu rotators. I am sure he has seen this mail and may have some valuable suggestions. Do share your experience if you manage to fix this problem.
Opening nuts is a big problem and your Motor Cycle workshop should be able to help. I got mine too opened that way.
73
Sangat, 9M2SS
2008/9/27 Sebastian <w4as@bellsouth.net mailto:w4as@bellsouth.net>
Well I had been back on the birds for the last 3 months or so, and while I was getting ready for an AO-16 pass a few days ago, my elevation rotor on my Yaesu G-5400B stopped at about 10 degrees. That's it. It won't go back down or up. So I checked the wiring on the rotor, everything appeared fine. I removed the elevation rotor from the azimuthal, and took it inside. I made a small patch cord to go from the control box to the rotor, but no luck. All I get is the display of the elevation of about 10 degrees, and I hear a little hum when I attempt to move it up or down. This tells me that the potentiometer is probably good, and the motor is receiving power. I've removed the small nameplate on the side, and there is no water inside, and I can see the ball bears; there doesn't appear to be any rust inside. I also removed the terminal assembly in case one of the wire had come loose, or had a cold solder joint, but I didn't find any problems there. Looking at the diagram of the rotor, there appears to only be a small 24 volt motor which turns this; along with numerous mechanical parts. So the question is. Before I send this to Yaesu, has anyone had this problem before, is it a minor one (something that I could fix myself), or is best left to Yaesu? Before anyone mentions, Norm's no longer services these rotors. The four 'screws' that hold the two parts are impossible for me to loosen. I would have to use a vice, but I do have a friend with a motorcycle repair business who I'm sure could open it for me in 60 seconds. To me, this looks like a jigsaw puzzle by looking at the diagram. The rotor was in service for about a couple of years back in the early 90s. It then sat inside without any use, up until a few months ago. If the consensus is to send it to Yaesu, should I bother to send in the azimuthal rotor, or should I follow the "don't fix it if it aint broken" rule? _______________________________________________ Sent via AMSAT-BB@amsat.org <mailto:AMSAT-BB@amsat.org>. 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-- Sangat Singh 53, Jln. Perdana National Planetarium 50480 Kuala Lumpur (MALAYSIA) Mobile: +60122838873 Office: +60322787388 FAX: +60322738873 Skype ID: sukhija
All
Here is my $.02. First smell the motor. If the motor has burnt windings you can smell them. mesureesure the resistance between the winding. If the resistance beteen the winding is roughly the same suspect the capastor in the control box. If something mechanical has failed a visually inspection will reveal it. There a lot of parts in there but is faitly intutive on how to assemble them.
good luck
nickly
-------------- Original message from Roy rdwelch@swbell.net: --------------
Hi Guys,
My two cents worth. It looks like Sebastian has made all of the checks. I assume the rotor will not move in either direction. It's possible that something had fallen into the gear train, jamming the works but it does sound more like a bad motor. Have you measured all of the voltages and especially the resistance values on the motor leads as shown in the owner's manual? If the resistances all look good and the supply voltages are good then I would check the resistance from each motor lead to the metal case to see if there is a short circuit to the rotor housing. I'm not sure but in some countries RFI hash protection has been added to the rotor circuitry consisting of small RF chokes and capacitors mounted inside the rotor case. For example, my Emoto rotors don't have it but the versions sold in some European countries do have it. You might check to see if there is a similar thing in your rotor and that there are no failures there. I doubt that this is the problem however. Good luck.
Roy -- W0SL
Sangat Singh wrote:
Sebastian,
I had a similar problem. In my case I found that the 24 volt motor had packed up. Since I had another Elevation Rotator with the faulty pot sitting on my bench for half a century, I swapped the motor and it worked. The motor is easily removed. Please remove the 4 screws that hold the motor and then try powering up and see if the motor works. I suppose you won't have a spare motor. I am trying to get the faulty motor rewired. Our local talent can do wonderful things.
You might consult Roy Welch who has a great knowledge on ailing Yaesu rotators. I am sure he has seen this mail and may have some valuable suggestions. Do share your experience if you manage to fix this problem.
Opening nuts is a big problem and your Motor Cycle workshop should be able to help. I got mine too opened that way.
73
Sangat, 9M2SS
2008/9/27 Sebastian >
Well I had been back on the birds for the last 3 months or so, and while I was getting ready for an AO-16 pass a few days ago, my elevation rotor on my Yaesu G-5400B stopped at about 10 degrees. That's it. It won't go back down or up. So I checked the wiring on the rotor, everything appeared fine. I removed the elevation rotor from the azimuthal, and took it inside. I made a small patch cord to go from the control box to the rotor, but no luck. All I get is the display of the elevation of about 10 degrees, and I hear a little hum when I attempt to move it up or down. This tells me that the potentiometer is probably good, and the motor is receiving power. I've removed the small nameplate on the side, and there is no water inside, and I can see the ball bears; there doesn't appear to be any rust inside. I also removed the terminal assembly in case one of the wire had come loose, or had a cold solder joint, but I didn't find any problems there. Looking at the diagram of the rotor, there appears to only be a small 24 volt motor which turns this; along with numerous mechanical parts. So the question is. Before I send this to Yaesu, has anyone had this problem before, is it a minor one (something that I could fix myself), or is best left to Yaesu? Before anyone mentions, Norm's no longer services these rotors. The four 'screws' that hold the two parts are impossible for me to loosen. I would have to use a vice, but I do have a friend with a motorcycle repair business who I'm sure could open it for me in 60 seconds. To me, this looks like a jigsaw puzzle by looking at the diagram. The rotor was in service for about a couple of years back in the early 90s. It then sat inside without any use, up until a few months ago. If the consensus is to send it to Yaesu, should I bother to send in the azimuthal rotor, or should I follow the "don't fix it if it aint broken" rule? _______________________________________________ Sent via AMSAT-BB@amsat.org . 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-- Sangat Singh 53, Jln. Perdana National Planetarium 50480 Kuala Lumpur (MALAYSIA) Mobile: +60122838873 Office: +60322787388 FAX: +60322738873 Skype ID: sukhija
-- Roy
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Hi Sebastian, W4AS
Electrical causes:
Before to open the rotor check if the starting capacitor C35 for the 24 volt AC motor is OK
Looking at the schematic diagram of your G-5400B rotor you will see that the starting unpolarized electrolitic capacitor C35, 100 uF is located inside the elevation rotor.
While running UP the rotor the voltage measured between the common of the motor numbar E6 and numbar E5 must be about 24 Volt AC and if the voltage measured between E4 and E5 is about 24 volt AC it indicates that the electrolitic capacitor C35 is not short circuited and both windings of the motor are OK
While running DOWN the rotor the voltage measured between the common of the motor numbar E6 and numbar E4 must be about 24 Volt AC and if the voltage measured between E4 and E5 is about 24 volt AC it indicates that the AC electrolitic capacitor C35 is not short circuited and both windings of the motor are OK
If the motor don't runs in any of both direction UP and DOWN disconnect the wires of the control box from terminals E4-E5-E6 of the rotor and measure the ohmic resistance of the motor windings.
If C35 is not short circuited you must measure the following resistances for the rotor windings.
Between terminals E4 and E6: 5 ohm Between terminals E5 and E6: 5 ohm Between terminals E4 and E5: 10 ohm
If the motor still don't run check C35 100 uF and measure it's capacity in uF because even if the voltage across it as measured between terminals E4 and E5 is 24 volt AC it can be an open capacitor.
If the above C35 must be replaced and you decide to open the rotor remember that the manufacturer has used liquid "loctite" into the treads of the screws.
To remove each screw do not attempt to use a percussion screwdriver but it is necessary to heat the head of the screw using a small gas flame after that a small wise grip size 5WR immediately applied is enough.
Mechanical causes:
In general the elevation rotor stuck mechanically when the ball bearing holders are defective because one or more teeth of the ball separators are broken.
When the ball separators are broken then the boom shaft tube falls down a litte bit so that the assembly tube gear do not engage anymore into the teeth of the final pinion of the gear box
Each bearing has 20 balls and since the ball separators are difficult to find and they are a source of problems I have removed that separators addeding I don't remember if 2 or 3 more same size balls to compensate for the room of the above ball separators.
In any case as soon the rotator is open you will be in condition to find the problem by your self.
Reassembling the rotator set the 500 ohm potentiometer with the wiper at 250 ohm each side and position the mark over the cast of the boom shaft tube for 90 degrees elevation.
Have fun and 73" de
i8CVS Domenico
----- Original Message ----- From: "Sebastian" w4as@bellsouth.net To: "AMSAT BB" AMSAT-BB@amsat.org Sent: Saturday, September 27, 2008 5:01 PM Subject: [amsat-bb] Kenpro elevation rotor repair
Well I had been back on the birds for the last 3 months or so, and while I was getting ready for an AO-16 pass a few days ago, my elevation rotor on my Yaesu G-5400B stopped at about 10 degrees.
That's it. It won't go back down or up.
So I checked the wiring on the rotor, everything appeared fine. I removed the elevation rotor from the azimuthal, and took it inside. I made a small patch cord to go from the control box to the rotor, but no luck. All I get is the display of the elevation of about 10 degrees, and I hear a little hum when I attempt to move it up or down. This tells me that the potentiometer is probably good, and the motor is receiving power.
I've removed the small nameplate on the side, and there is no water inside, and I can see the ball bears; there doesn't appear to be any rust inside. I also removed the terminal assembly in case one of the wire had come loose, or had a cold solder joint, but I didn't find any problems there. Looking at the diagram of the rotor, there appears to only be a small 24 volt motor which turns this; along with numerous mechanical parts.
So the question is. Before I send this to Yaesu, has anyone had this problem before, is it a minor one (something that I could fix myself), or is best left to Yaesu? Before anyone mentions, Norm's no longer services these rotors. The four 'screws' that hold the two parts are impossible for me to loosen. I would have to use a vice, but I do have a friend with a motorcycle repair business who I'm sure could open it for me in 60 seconds. To me, this looks like a jigsaw puzzle by looking at the diagram.
The rotor was in service for about a couple of years back in the early 90s. It then sat inside without any use, up until a few months ago. If the consensus is to send it to Yaesu, should I bother to send in the azimuthal rotor, or should I follow the "don't fix it if it aint broken" rule? _______________________________________________ Sent via AMSAT-BB@amsat.org. 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
During the 20:45 UTC pass over Delft I uplinked a pulsed carrier to test the transponder functionality. The 10 pulses with various length were successfully received by our omnidirectional SDR station within the passband. The used power was 75W with 14dBd antenna gain. (about 1.8kW ERP) The transponder is working just fine at that moment. However, We are still interested in all of your uplink experiences and signal reports.
73's
Wouter Weggelaar PA3WEG Delfi-C3 Team
On Sat, Sep 27, 2008 at 3:07 PM, Rob Hardenberg PE1ITR rob@itr-datanet.com wrote:
The transponder noise is very audiable. I have listened (looked) to the transponder downlink with DSP waterfall and transmitted with 100w on the uplink. Not a trace of any signal. I don't think this is a polarisation matter. Normally 10w on the uplink is sufficient to get a solid signal on the downlink.
On september 15th I had a 57 signal from de DO-64 transponder and suddenly my signal disappeared. At the time beacon and transponder noise where still audiable. It looks like a problem with the receiver.
73 Rob PE1ITR
OZ1MY schreef:
Hi Mak, Yes I have made QSOs as well. Last time was 9th of September. In the start of the life of the transponder it was much easier.
I do not know what is different - but one thing could be the attitude of DO-64. If that is the course I would expect the effect to change from orbit to orbit ?
One thing that is sure is that it is on the receive side. Even without a preamplifier I can hear the noise floor of the transponder. May be something has gone wrong - only time will show.
Perhaps someone from Delfts knows ?
73 OZ1MY Ib ----- Original Message ----- From: "SV1BSX" sv1bsx@yahoo.gr To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 1:04 PM Subject: [amsat-bb] Re: Status DO-64?
Hi Ib,
tks for reply and informative note. However I wondering about the DO-64 ! If you "shoot" the satellite with 2x19 el and 70 W, I suppose the ERP from a similar system is 2-3 KWatts. In case you had not easy access to satellite with this power, I wondering what is changed, as I remember that during the first weeks of
transponder's
activation the satellite was accessible, even if somebody was using 200-300 Watts ERP (that is my max power and I managed a lot of QSOs).
Anyway, too bad if the satellite-uplink is not enough sensitive any
longer.
I can't imagine ....5-10 KW ERP uplink-power for a good enough access. This way is a non-usable object for the majority of amateur satellite operators.
73, Mak SV1BSX
----- Original Message ----- From: "OZ1MY" oz1my@privat.dk To: "SV1BSX" sv1bsx@yahoo.gr; amsat-bb@amsat.org Cc: rob@itr-datanet.com Sent: Saturday, September 27, 2008 12:46 PM Subject: Re: [amsat-bb] Re: Status DO-64?
Hi Mak and Rob, I just had a pass here over Copenhagen with max elevation of 86 degrees. I were able to hear myself using 70 W to my normal 2x19 element antenna - but very faint. I also heard a CW station. Conclusion - it is on but very difficult to use unless you have a lot of power for the uplink (more than I have). Have a nice weekend all 73 OZ1MY Ib ----- Original Message ----- From: "SV1BSX" sv1bsx@yahoo.gr To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:33 AM Subject: [amsat-bb] Re: Status DO-64?
Hi Rob,
I agree. Today morning I tried at 08:02 - 08:10Z, Orbit #2252,
excellent
pass for my location.
As you pointed out, I also heard the beacon with a true 559 on CW (Hi Hi DELFI-C3), however it was impossible to access the transponder.
So, your note is correct.
73, Mak SV1BSX
----- Original Message ----- From: "Rob Hardenberg PE1ITR" rob@itr-datanet.com To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:13 AM Subject: [amsat-bb] Status DO-64?
Hi All,
Er there station making qso's on DO-64? Last 2 weeks I tried serveal
times
but I can't hear my signal on the transponder. It looks like the transponder receiver is not working. I can hear the beacon and transponder noise very well.
73 Rob PE1ITR http://www.pe1itr.com
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program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. 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
Sent via AMSAT-BB@amsat.org. 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
Sent via AMSAT-BB@amsat.org. 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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Hello Sebastian,
I would send it to Larry, K6VLF. Larry has parts for these rotors and gets them out very fast and does a great job in overhauling them..
73,
Dave / W6TE ----- Original Message ----- From: Sebastianmailto:w4as@bellsouth.net To: AMSAT BBmailto:AMSAT-BB@amsat.org Sent: Saturday, September 27, 2008 8:01 AM Subject: [amsat-bb] Kenpro elevation rotor repair
Well I had been back on the birds for the last 3 months or so, and while I was getting ready for an AO-16 pass a few days ago, my elevation rotor on my Yaesu G-5400B stopped at about 10 degrees.
That's it. It won't go back down or up.
So I checked the wiring on the rotor, everything appeared fine. I removed the elevation rotor from the azimuthal, and took it inside. I made a small patch cord to go from the control box to the rotor, but no luck. All I get is the display of the elevation of about 10 degrees, and I hear a little hum when I attempt to move it up or down. This tells me that the potentiometer is probably good, and the motor is receiving power.
I've removed the small nameplate on the side, and there is no water inside, and I can see the ball bears; there doesn't appear to be any rust inside. I also removed the terminal assembly in case one of the wire had come loose, or had a cold solder joint, but I didn't find any problems there. Looking at the diagram of the rotor, there appears to only be a small 24 volt motor which turns this; along with numerous mechanical parts.
So the question is. Before I send this to Yaesu, has anyone had this problem before, is it a minor one (something that I could fix myself), or is best left to Yaesu? Before anyone mentions, Norm's no longer services these rotors. The four 'screws' that hold the two parts are impossible for me to loosen. I would have to use a vice, but I do have a friend with a motorcycle repair business who I'm sure could open it for me in 60 seconds. To me, this looks like a jigsaw puzzle by looking at the diagram.
The rotor was in service for about a couple of years back in the early 90s. It then sat inside without any use, up until a few months ago. If the consensus is to send it to Yaesu, should I bother to send in the azimuthal rotor, or should I follow the "don't fix it if it aint broken" rule?
participants (10)
-
David Smith -
i8cvs -
OZ1MY -
quadpugh＠bellsouth.net -
Rob Hardenberg PE1ITR -
Roy -
Sangat Singh -
Sebastian -
SV1BSX -
Wouter Weggelaar