Maco Antennas VQ2-QUAD Assembly Instructions Manual - page 6
*
NOTE:
THESE DIMENSONS ARE AP-
PROXIMATE. REFER TO THE
TIONS ON
THE S.W.R. TO
DETERMINE EXACT SETTINGS. THERE
ARE 2 SEPARATE GAMMA ADJUSTMENTS,
1. CAPACITOR ADJUSTMENT, 2. SLIDER
POSITION.
DO NOT MOVE BOTH AT THE SAME
TIME.
MOVE THE CAPACITOR FIRST,
THEN, IFNECESSARY
SLIDER,
AND GO BACK TO THE CAPACITOR.
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S 2 1 ,
N 1 2
S C R E W S ,
L K . W S R S , S Q . N U T S
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R E A R
GAMMA MATCH MOUNTING
S T R A P S
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( I N S T A L L F L U S H
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A G A I N S T
E L E M E N T M O U N T )
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Attach the Gamma Match
to the driven element on the director end of the boom (ref. Fig.
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1) using the Gamma Straps
and attaching hardware as shown. Attach your coaxial cable
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to the connector (S42) and dress along boom and down mast.
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ADJUSTING STANDING WAVE RATIO
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The dimensions given are approximate and should be used as a starting point.*
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The Gamma Match has 2 adjustments. First is the capacitor adjustment and second is the slider
adjustment. Connect a S.W.R. bridge between your transmitter and the antenna and check the S.W.R.
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If adjustment is requiredloosen the clamp on the gammamatch and the screws holding the slider (Gamma
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Straps ZO
Next move the capacitor adjustment first in one direction, then the other until a minimum
S.W.R. reading is obtained. If S.W.R.
satisfactory, move the slider out 2” towards the boom. Now
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readjust the capacitor for a minimum S.W.R. You should now be able to determine which direction to
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move the slider. Repeat the above procedure, moving the slider in smaller incrementsuntil a satisfactory
S.W.R. reading is obtained. Tighten all hardware. Disconnect the S.W.R. bridge and reconnect your
coaxial cable.
5
V QUAD