Modifications for Tennadyne T11 (also for T8 & T10 models)

This modification is for the Original antenna models that use the original sized BMI

The NEW HD Tennadyne models use a larger BMI (Boom Mast Interface block) than the older models without the HD designation.  Click here if you have one of the the NEW HD models. 

The Tennadyne T8, T10 and T11 antennas can be mounted on the standard model tiltplate.  The TiltPlate will be modified and the additional hardware provided when you order.  The holes will be drilled and the hardware in place ready to mount the BMI when you receive the TiltPlate. 

The diagrams below showing the drill locations are for reference.  You can use either the stackable or non-stackable versions depending on whether you want to mount another antenna above the T11.   The optional KARLock is also supported.  There is no additional charge for the the TiltPlate modification and necessary hardware.    

Tennadyne T11 antenna

This antenna uses a "dual square tube" boom shown below.    The booms are electrically isolated at the boom mast plate with an insulator  (the BMI).  The booms are attached to the BMI with 3/8 inch bolts.  In the normal installation, the mast (round tube in the picture below) is attached to the BMI with 2 clamps.

TiltPlate modifications - The BMI is mounted directly to the moveable plate on the TiltPlate with four (4) studs.   The TiltPlate BMI studs are 7/16 inch stainless steel to provide a very strong connection.  All of the necessary hardware is provided.  The optional KARLock can be used with the Tennadyne antenna if desired.   Below is a diagram of the BMI to TiltPlate connection.

Note: the mast plate on the TiltPlate and the BMI will be parallel when shipped.  No additional antenna leveling should be required to insure the antenna elements are horizontal when the tower is in the operational position.

The TiltPlate boom plate is modified to add the mounting studs. Four 1/2 inch holes are drilled for the 7/16 inch stainless steel studs. 

Two leveling bolts are installed to insure antenna is level.  See diagram below.

The BMI is mounted using the hardware (washers, lock washers, nuts as noted in the "Tennadyne adapter diagram" above.  In the picture below are two short representaive sections of the square boom.

Side view below.  The distance between the bottom of the BMI and the TiltPlate is 3/4 inch.  The distance between the top of the BMI and the TiltPlate is 1 1/8 inch.   The 3/8 inch difference allows for the needed offset.  The optional KARLock is shown. 

Basic Installation steps

- Install the TiltPlate on your tower.   (with the tower in the tilted over maintenance position)

- If you ordered the optional KARLock, install the pivot block before installing the BMI.

- If you ordered the optional KARLock and the STACKABLE configuration,  the catch block will already be installed in the correct location.

- If you ordered the optional KARLock and the NON-Stackable configruation, install the catch block on the mast and align the arrows.  

- Slide the BMI over the TiltPlate mounting studs (the boom sections should already be attached and the antenna may be completely assembled).   If the BMI does not slide over the studs easily, you can loosen one or more of the studs to align them.

- Install the hardware (flat washer, lock washer, and nuts) per the diagram.  

-Complete any necessary wiring and the tower is ready to raise.  The BMI and antenna should not require any additional leveling however there is a leveling bolt should a fine adjustment be needed.