Mechanical tilt mounting system for a base station antenna
A mechanical tilt mounting system for a base station antenna includes a fixed pivot that connects the antenna to a support structure. The antenna is rotatable about the fixed pivot. An adjustable control arm has a first end connected to the antenna and a second end connected to the support structure. Extension and contraction of the adjustable arm rotates the antenna about the fixed pivot to change the angle of inclination of the antenna.
1. A mechanical tilt mounting system for a base station antenna, comprising:
an antenna;
a fixed pivot configured to connect the antenna to a support structure at a first location on the support structure, the antenna being rotatable about the fixed pivot to change the angle of inclination of the antenna, the support structure comprising a pole, a tower, or other raised structure;
an adjustable control arm comprising a turnbuckle assembly having a first end connected to the antenna and a second end connected to the support structure at a second location on the support structure that is spaced apart from the first location, wherein the first end of the adjustable control arm comprises a first lockable pivot and the second end of the adjustable control arm comprises a second lockable pivot, and wherein adjustment of the turnbuckle assembly rotates the antenna about the fixed pivot.
2. The mechanical tilt mounting system for a base station antenna according to claim 1 , wherein the first lockable pivot and the second lockable pivot each comprise a pivot pin that is secured by a mating member that may be tightened to fix the position of the adjustable control arm relative to the support structure and to the antenna and loosened to allow relative pivoting motion between the adjustable control arm and the support structure and the antenna about the first pivot pin and the second pivot pin.
3. The mechanical tilt mounting system for a base station antenna according to claim 1 , wherein the turnbuckle assembly comprises a first threaded member defining the first end and a second threaded member defining the second end, wherein one of the first threaded member and the second threaded member is a left-hand thread and the other one of the first threaded member and the second threaded member is a right-hand thread.
4. The mechanical tilt mounting system for a base station antenna according to claim 3 , wherein the first threaded member and the second threaded member threadably engage a frame such that rotation of the frame causes both of the first threaded member and the second threaded member to be simultaneously extended from or retracted into the frame.
5. The mechanical tilt mounting system for a base station antenna according to claim 1 , further comprising an expandable and contractable slide arm having a first end connected to the antenna and a second end configured to connect to a support structure, wherein the first end of the slide arm comprises a third lockable pivot and the second end of the slide arm comprises a fourth lockable pivot.
6. The mechanical tilt mounting system for a base station antenna according to claim 5 , wherein the slide arm comprises a first arm section and a second arm section, the first arm section and the second arm section being slidably mounted relative to one another such that the position of the first arm section relative to the second arm section is adjustable to set the length of the slide arm and a slide lock for releasably securing the position of the first arm section relative to the second arm section arm section to thereby fix the length of the slide arm.
7. A method of adjusting the mechanical tilt of a base station antenna, comprising:
rotating a frame of a turnbuckle assembly to increase or decrease the length of the turnbuckle assembly to rotate the base station antenna about a fixed pivot axis, the turnbuckle assembly having a first end comprising a first lockable pivot connected to the antenna and a second end comprising a second lockable pivot connected to a pole, a tower, or other raised structure;
locking the position of the turnbuckle assembly relative to the base station antenna comprising locking at least one of the first and second lockable pivots.
8. A mechanical tilt mounting system for a base station antenna, comprising:
an antenna;
a fixed pivot configured to connect the antenna to a support structure, the antenna being rotatable about the fixed pivot to change the angle of inclination of the antenna;
an adjustable mount comprising an adjustable arm having an effective length, the adjustable arm comprising a first member defining a first pivot pivotably connected to the antenna and a second member connected to the support structure that defines a second pivot, the first member being pivotably and translationally connected to the second member at the second pivot; and
a linear drive for moving the first member relative to the second member to change the effective length.
9. The mechanical tilt mounting system for a base station antenna according to claim 8 , wherein the first member is pivotably connected to the antenna at a first axis of rotation and the second member is pivotably connected to a support structure at a second axis of rotation, the effective length being a distance between the first axis of rotation and the second axis of rotation wherein movement of the first member relative to the second member changes the distance.
10. The mechanical tilt mounting system for a base station antenna according to claim 8 , wherein the first member is mounted to the antenna by a first lockable pivot that forms the first axis of rotation and the second member is mounted to the first member by a second lockable pivot that forms the second axis of rotation.
11. The mechanical tilt mounting system for a base station antenna according to claim 10 , wherein the linear drive comprises a lead screw that is mounted for rotational movement along its longitudinal axis, wherein the lead screw is fixed to one of the first member or the second member and threadably engages a follower that is secured to the other one of the first member and the second member.
12. The mechanical tilt mounting system for a base station antenna according to claim 11 , wherein the first member comprises an elongated slot that receives the second lockable pivot and the lead screw extends parallel to the elongated slot.
13. The mechanical tilt mounting system for a base station antenna according to claim 11 , wherein rotation of the lead screw causes the first member to extend away from or retract toward the second member to change the effective length of the adjustable arm.
14. The mechanical tilt mounting system for a base station antenna according to claim 11 , wherein the lead screw comprises a connector configured to be engaged by a power driver.
15. The mechanical tilt mounting system for a base station antenna according to claim 10 , wherein the first lockable pivot and the second lockable pivot each comprise a pivot pin that is secured by a mating member that may be tightened to fix the position of the first member relative to the antenna and to the second member and loosened to allow relative pivoting motion between the first member and the antenna and the second member.
16. A method of operating a mechanical tilt mounting system for a base station antenna comprising a fixed pivot configured to connect the antenna to a support structure, an adjustable mount comprising an adjustable arm having a first end pivotably connected to the antenna at a first lockable pivot and a second end pivotably connected to a support structure at a second lockable pivot, wherein the adjustable arm comprises a first member defining the first pivot and a second member defining the second pivot where the distance between the first member and the second member defines an effective length of the adjustable arm, the first member being pivotably and translationally connected to the second member, and a linear drive for moving the first member relative to the second member, the method comprising:
unlocking the first lockable pivot;
unlocking the second lockable pivot;
actuating the linear drive to move the first member relative to the second member to change the effective length of the adjustable arm.
17. The method according to claim 16 , wherein the linear drive comprises a lead screw and actuating the linear drive comprises engaging the lead screw with a power driver.