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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Alliance U100 antenna rotor
I used to install the Alliance U100 rotors for all my antenna jobs. These rotors had 4 terminals that connected to the control box. I just came across an Alliance rotor that looks just like a U100 however it has 5 terminals instead of 4. I have never seen this model of Alliance rotor before. Does anyone know what the purpose of the fifth terminal was for and if there is any way that this rotor could be used with a standard U100 four terminal control box? Someone else suggested that the fifth terminal was for a similar system as the U100 but it was solid state. If so, was the solid state circuitry in the box or the rotor? Because as I remember from disassembling and repairing some of those, inside the rotor were just motor windings and a stop switch, I wonder if in fact the electronics was all in the box and the fifth terminal was just something to do with the solid state "improvement" to the system, one could possibly ignore the fifth terminal and just use a standard U100 ratchet type box? Lenny |
#2
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Alliance U100 antenna rotor
klem kedidelhopper wrote:
I used to install the Alliance U100 rotors for all my antenna jobs. These rotors had 4 terminals that connected to the control box. I just came across an Alliance rotor that looks just like a U100 however it has 5 terminals instead of 4. I have never seen this model of Alliance rotor before. Does anyone know what the purpose of the fifth terminal was for and if there is any way that this rotor could be used with a standard U100 four terminal control box? Someone else suggested that the fifth terminal was for a similar system as the U100 but it was solid state. If so, was the solid state circuitry in the box or the rotor? Because as I remember from disassembling and repairing some of those, inside the rotor were just motor windings and a stop switch, I wonder if in fact the electronics was all in the box and the fifth terminal was just something to do with the solid state "improvement" to the system, one could possibly ignore the fifth terminal and just use a standard U100 ratchet type box? Lenny It's not a "stop switch", every time the contacts close, it actuates the solenoid in the control box & advances the dial by 1 detent. Jerry |
#3
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Alliance U100 antenna rotor
Jerry Peters wrote:
klem kedidelhopper wrote: I used to install the Alliance U100 rotors for all my antenna jobs. These rotors had 4 terminals that connected to the control box. I just came across an Alliance rotor that looks just like a U100 however it has 5 terminals instead of 4. I have never seen this model of Alliance rotor before. Does anyone know what the purpose of the fifth terminal was for and if there is any way that this rotor could be used with a standard U100 four terminal control box? Someone else suggested that the fifth terminal was for a similar system as the U100 but it was solid state. If so, was the solid state circuitry in the box or the rotor? Because as I remember from disassembling and repairing some of those, inside the rotor were just motor windings and a stop switch, I wonder if in fact the electronics was all in the box and the fifth terminal was just something to do with the solid state "improvement" to the system, one could possibly ignore the fifth terminal and just use a standard U100 ratchet type box? Lenny It's not a "stop switch", every time the contacts close, it actuates the solenoid in the control box & advances the dial by 1 detent. Jerry Your 5-terminal rotator unit is likely model C-225. It's definitely a solid state control box, and can't be modified to control a U-100 rotor. The rotors are different inside; the U-100 rotor having a reversing capacitor and the motor, the C-225 having the motor and a position-sensing potentiometer. Go to http://bama.edebris.com/manuals/alliance/rotorservice and download the Alliance Antenna Rotor Service Manual and you'll be able to see the details of both models, and why they aren't compatible. -- David dgminala at mediacombb dot net |
#4
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Alliance U100 antenna rotor
On Sep 21, 6:21*pm, "Dave M" wrote:
Jerry Peters wrote: klem kedidelhopper wrote: I used to install the Alliance U100 rotors for all my antenna jobs. These rotors had 4 terminals that connected to the control box. I just came across an Alliance rotor that looks just like a U100 however it has 5 terminals instead of 4. I have never seen this model of Alliance rotor *before. Does anyone know what the purpose of the fifth terminal was for and if there is any way that this rotor could be used with a standard U100 four terminal control box? Someone else suggested that the fifth terminal was for a similar system as the U100 but it was solid state. If so, was the solid state circuitry in the box or the rotor? Because as I remember from disassembling and repairing some of those, inside the rotor were just motor windings and a stop switch, *I wonder if in fact the electronics was all in the box and the fifth terminal was just something to do with the solid state "improvement" to the system, one could possibly ignore the fifth terminal and just use a standard U100 ratchet *type box? Lenny It's not a "stop switch", every time the contacts close, it actuates the solenoid in the control box & advances the dial by 1 detent. Jerry Your 5-terminal rotator unit is likely model C-225. *It's definitely a solid state control box, and can't be modified to control a U-100 rotor. *The rotors are different inside; the U-100 rotor having a reversing capacitor and the motor, the C-225 having the motor and a position-sensing potentiometer. Go tohttp://bama.edebris.com/manuals/alliance/rotorserviceand download the Alliance Antenna Rotor Service Manual and you'll be able to see the details of both models, and why they aren't compatible. -- David dgminala at mediacombb dot net Thanks very much for that link Dave. I had no idea that Alliance made so many different types of rotors. In every new antenna installation I ever did I always used a U100. The funny thing is in all these years of mixing and matching old four terminal stuff I either picked up or had lying around I never had a problem getting a box/control combo to work. But after looking at the schematics I guess I've been extremely lucky. It's truly a shame they went out of business, They had the best product for TV in the industry. I never had to climb up on someone's roof even years later to replace a defective Alliance rotor. The current Chinese Channel Master is a real POS. I wouldn't even install one for a customer. Lenny |
#5
Posted to sci.electronics.repair
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Alliance U100 antenna rotor
klem kedidelhopper wrote: On Sep 21, 6:21 pm, "Dave M" wrote: Jerry Peters wrote: klem kedidelhopper wrote: I used to install the Alliance U100 rotors for all my antenna jobs. These rotors had 4 terminals that connected to the control box. I just came across an Alliance rotor that looks just like a U100 however it has 5 terminals instead of 4. I have never seen this model of Alliance rotor before. Does anyone know what the purpose of the fifth terminal was for and if there is any way that this rotor could be used with a standard U100 four terminal control box? Someone else suggested that the fifth terminal was for a similar system as the U100 but it was solid state. If so, was the solid state circuitry in the box or the rotor? Because as I remember from disassembling and repairing some of those, inside the rotor were just motor windings and a stop switch, I wonder if in fact the electronics was all in the box and the fifth terminal was just something to do with the solid state "improvement" to the system, one could possibly ignore the fifth terminal and just use a standard U100 ratchet type box? Lenny It's not a "stop switch", every time the contacts close, it actuates the solenoid in the control box & advances the dial by 1 detent. Jerry Your 5-terminal rotator unit is likely model C-225. It's definitely a solid state control box, and can't be modified to control a U-100 rotor. The rotors are different inside; the U-100 rotor having a reversing capacitor and the motor, the C-225 having the motor and a position-sensing potentiometer. Go tohttp://bama.edebris.com/manuals/alliance/rotorserviceand download the Alliance Antenna Rotor Service Manual and you'll be able to see the details of both models, and why they aren't compatible. -- David dgminala at mediacombb dot net Thanks very much for that link Dave. I had no idea that Alliance made so many different types of rotors. In every new antenna installation I ever did I always used a U100. The funny thing is in all these years of mixing and matching old four terminal stuff I either picked up or had lying around I never had a problem getting a box/control combo to work. But after looking at the schematics I guess I've been extremely lucky. It's truly a shame they went out of business, They had the best product for TV in the industry. I never had to climb up on someone's roof even years later to replace a defective Alliance rotor. The current Chinese Channel Master is a real POS. I wouldn't even install one for a customer. Lenny I had to, quite a few times to replace the soft seal on rotors that were 25+ years old. I would pull the rotor, replace the old screws with stainless, clean and relube the bearings. If it had the open pot to drive a meter for position I would clean the resistance wire & sliding contact, and use GC Tunerlube on the wire. Add a new non polar electrolytic to the control box & replace the old wire between them, and they would run another 25 years. Some I serviced were so old that they simply had a lamp to tell you that the rotor was at the end of it's rotation. -- You can't have a sense of humor, if you have no sense. |
#6
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Alliance U100 antenna rotor
On Sep 22, 12:23*pm, "Michael A. Terrell"
wrote: klem kedidelhopper wrote: On Sep 21, 6:21 pm, "Dave M" wrote: Jerry Peters wrote: klem kedidelhopper wrote: I used to install the Alliance U100 rotors for all my antenna jobs.. These rotors had 4 terminals that connected to the control box. I just came across an Alliance rotor that looks just like a U100 however it has 5 terminals instead of 4. I have never seen this model of Alliance rotor *before. Does anyone know what the purpose of the fifth terminal was for and if there is any way that this rotor could be used with a standard U100 four terminal control box? Someone else suggested that the fifth terminal was for a similar system as the U100 but it was solid state. If so, was the solid state circuitry in the box or the rotor? Because as I remember from disassembling and repairing some of those, inside the rotor were just motor windings and a stop switch, *I wonder if in fact the electronics was all in the box and the fifth terminal was just something to do with the solid state "improvement" to the system, one could possibly ignore the fifth terminal and just use a standard U100 ratchet *type box? Lenny It's not a "stop switch", every time the contacts close, it actuates the solenoid in the control box & advances the dial by 1 detent. Jerry Your 5-terminal rotator unit is likely model C-225. *It's definitely a solid state control box, and can't be modified to control a U-100 rotor. *The rotors are different inside; the U-100 rotor having a reversing capacitor and the motor, the C-225 having the motor and a position-sensing potentiometer. Go tohttp://bama.edebris.com/manuals/alliance/rotorserviceanddownload the Alliance Antenna Rotor Service Manual and you'll be able to see the details of both models, and why they aren't compatible. -- David dgminala at mediacombb dot net Thanks very much for that link Dave. I had no idea that Alliance made so many different types of rotors. In every new antenna installation I ever did I always used a U100. The funny thing is in all these years of mixing and matching old *four terminal stuff I either picked up or had lying around I never had a problem getting a box/control combo to work. But after looking at the schematics I guess I've been extremely lucky. It's truly a shame they went out of business, They had the best product for TV in the industry. I never had to climb up on someone's roof even years later to replace a defective Alliance rotor. The current Chinese Channel Master is a real POS. I wouldn't even install one for a customer. Lenny * *I had to, quite a few times to replace the soft seal on rotors that were 25+ years old. *I would pull the rotor, replace the old screws with stainless, clean and relube the bearings. *If it had the open pot to drive a meter for position I would clean the resistance wire & sliding contact, and use GC Tunerlube on the wire. *Add a new non polar electrolytic to the control box & replace the old wire between them, and they would run another 25 years. * *Some I serviced were so old that they simply had a lamp to tell you that the rotor was at the end of it's rotation. -- You can't have a sense of humor, if you have no sense. When I was a teenager I found one of those old rotors on the roof of an apartment house near where we lived in The Bronx. A friend who was a Ham radio operator gave me an old control box to operate it. The control box put out the correct voltage to operate the motor but the system had no position indication. I believe they were mismatched. This motor had a stop switch and a small aluminum "chock" that would jam the motor if it tried to go further than 360 degrees. I removed the chock feeling that it was an unhealthy thing to do and installed an indicator light circuit wired to the stop switch contacts in the motor. The light would come on as you approached 360 degrees from either direction. I'm 65 years old and am still using that rotor/box combination. Can't say enough about Alliance equipment. Lenny |
#7
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Alliance U100 antenna rotor
klem kedidelhopper wrote: Michael A. Terrell wrote: I had to, quite a few times to replace the soft seal on rotors that were 25+ years old. I would pull the rotor, replace the old screws with stainless, clean and relube the bearings. If it had the open pot to drive a meter for position I would clean the resistance wire & sliding contact, and use GC Tunerlube on the wire. Add a new non polar electrolytic to the control box & replace the old wire between them, and they would run another 25 years. Some I serviced were so old that they simply had a lamp to tell you that the rotor was at the end of it's rotation. When I was a teenager I found one of those old rotors on the roof of an apartment house near where we lived in The Bronx. A friend who was a Ham radio operator gave me an old control box to operate it. The control box put out the correct voltage to operate the motor but the system had no position indication. I believe they were mismatched. This motor had a stop switch and a small aluminum "chock" that would jam the motor if it tried to go further than 360 degrees. I removed the chock feeling that it was an unhealthy thing to do and installed an indicator light circuit wired to the stop switch contacts in the motor. The light would come on as you approached 360 degrees from either direction. I'm 65 years old and am still using that rotor/box combination. Can't say enough about Alliance equipment. Lenny They were one of the best, along with some CDE rotor models. The Channel Master/Radio Shack rotors were definitely lower quality. I saw a lot that were under five years old that were just plain worn out. I replaced a lot of AC capacitors in the CDE rotors, and worn out or cracked ball bearings. I had a spare U100 control box housing, and made a nice test speaker out of it. A piece of cloth cover wire mesh for the grill over a good quality 4" speaker, and a line transformer. A pair of DPDT switches let me select 4/8 ohms or 25/70 volts at a half watt to service the building wiring of school intercoms. -- You can't have a sense of humor, if you have no sense. |
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