THESE DIMENSONS ARE APPROXIMATE.
REFER TO THE INSTRUCTIONS ON
THE
S.W.R. TO DETERMINE EXACT SETTINGS. THERE
SEPARATEGAMMAADJUSTMENTS,
TOR ADJUSTMENT, 2. SLIDER POSITION.
DO NOT MOVE BOTH AT THE SAME TIME.
MOVE
THE CAPACITOR FIRST, THEN, IF NECESSARY MOVE
THE SLIDER, AND GO BACK TO THE CAPACITOR.
-GAMMA STRAPS
(INSTALL FLUSH
AGAINST
ELEMENT MOUNT)
S21,
O-24 x
SCRE
LK. WSHRS SQ.
NUTS
S21,
N12
O-24 x
SCREWS
LK. WSHRS 8 SQ.
24 NUT
WASHER
GAMMA STRAPS
(SLIDER)
(CUSTOMER
FURNISHED)
PLASTIC SHOULDER
WASHER
FLATWASHER
GO1 P GAMMA MATCH
FIGURE 4
GAMMA MATCH MOUNTING
Mount the gamma match (GO
to the driven element, using the gamma straps
and attaching
hardware as shown. Attach your 52 ohm coaxial cable to the connector (S42) and dress along boom and down the
mast. The gamma is shown pointing down this is to let water out.
ADJUSTING THE STANDING WAVE RATIO
Refer to Figure 4. The dimensions given are approximate and should be used as a starting point. * The gamma
match has 2 adjustments. First is the capacitor adjust and second is the slider adjust. Connect a SWR bridge coax
between your transmitter and the antenna and check the SWR. If adjustment is required, loosen the clamp on the
gamma match and the screws holding the slider (gamma straps
Next move the capacitor adjustment first
one direction, then the other until a minimum SWR reading is obtained. If SWR is not yet satisfactory, move the
slider out 2” away from the boom.
reading has gone up move the slider back to the original position and then
2” towards the boom. Now readjust the capacitor for minimum SWR. You should now be able to determine which
direction to move the slider. Repeat the above procedure moving the slider in smaller increments until a satisfactory
SWR is obtained. Tighten all hardware. Disconnect the SWR bridge and reconnect your coaxial cable.
NOTE!
When assembling for vertical use, set antenna on a pole about 8 to 9 feet above the ground horizontally and
adjust
SWR to 1.7. When you turn the antenna vertical and mount it on the tower, etc., the SWR will drop to 1.4
to 1.5. This is good; QUIT! Antenna results best if vertical antenna clears the top of the tower.
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