M2 2M9SSB/FM, Assembly Manual

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1. Start by laying out the boom sections using the DIMENSION sheet as a guide. Use 8-32 X 1-1/4
screws and locknuts to join sections. Sections may be swaged to fit each other or use short
internal splice sections.
2. Lay out the elements by length and position as shown the DIMENSION sheet. Start with the
reflector (longest) element and push on a black button insulator to about 1/2” from center. Push the
element through the holes 1/2" from the rear of the boom and install the second button, snugging it
up into boom. DO NOT BOTHER WITH ACCURATELY CENTERING the element at this time and
DO NOT INSTALL the stainless steel SHAFT RETAINERS yet. This is easier to do after all the
elements are installed in the boom.
3. Install the 3/16” rod DRIVEN ELEMENT as you did the reflector. Then continue with the installation
of the DIRECTORS. Note that the Director Elements do not consistently diminish in length from
rear to front, so pay close attention to length and position.
4. Now begin centering the elements. Use a tape measure to EQUALIZE the amount the element
sticking out on each side of the boom. Once you have all the elements centered, sight down the
element tips from the rear comparing each side. Look for any obvious discrepancies and correct if
found.
5. NOTE: The SHAFT RETAINERS, used for securing the elements, should always be used for
permanent and long term antenna installations. For portable or temporary use, or whenever it is
anticipated that the antenna will be disassembled within a short time, the retainers may be left off.
The button insulators, normally a tight fit, hold the elements quite securely.
Begin installing the stainless shaft retainers. Use thumb and index finger to hold a Shaft Retainer
over end of the 3/8 x 3” push tube (Shaft Retainer dished into tube). Hold the element firmly and
2M9SSB/FM ASSEMBLY MANUAL