Active LPDA Antenna
Rio Rancho, NM
5
Mounting
The mounting block
supplied with the
antenna provides
threaded openings
for 1/4-20 and
3/8-16 tripods, and
a 5/8-27 threaded
opening for micro-
phone stands.
The mounting block can be rotated 90 degrees by
removing the four screws, rotating the mounting block
and re-assembling.
Retain the four lock nuts with a
wrench or socket and remove the
screws from the opposite side.
NOTE: Other mounting configurations are
available using the optional ALPKIT shown in the
Optional Accessories listing.
Display brightness
Press and hold both UP and DOWN arrow buttons un-
til the power LED blinks and a
b.(x)
appears. Release
the buttons and immediately press the UP or DOWN
button to adjust the brightness. When the buttons are
released for about 2 seconds, the display will store the
setting, stop blinking and return to the normal operat-
ing mode.
PWR
Adjusting gain
The RF amplifier applies 12dB of gain. Built-in attenu-
ators can be applied in 1dB steps to reduce the gain
from +12dB down to -6dB.
• Positive gain compensates for loss in longer co-
axial cable runs between the antenna and receiver
• Reduce the output level of the antenna to the level
of a standard dipole antenna (
-4
setting)
• Reduce the output level of the antenna when high
power transmitters are used in close proximity to
the antenna
Press and hold either the UP or DOWN arrow until the
power LED blinks. Release the button and immediately
press the UP or DOWN button to adjust the gain to
the desired setting. When the buttons are released
for about 2 seconds, the setting will be stored and the
display will return to the normal operating mode.
Calculating Needed Gain
Add up the loss caused by long coaxial cable runs,
splitters, etc. between the antenna and the receiver to
determine the total loss and set the gain to compen-
sate. For example, consider a 4-way passive splitter
such as the ZFSC41 with 6 dB of loss at each output
and a coaxial cable such as the ARG15 with 2 dB of
loss, for a total loss of 8 dB at the receiver. Set the
gain at
8
to offset the loss.
Adjusting bandwidth
Band pass filters are included in the circuitry to sup-
press RF signals above and below the useful band-
width of the antenna. The filter bandwidth can be set
to 470 to 608 MHz (
F.6
) for use in the US, or to 470 to
700 MHz (
F.7
) for use in export regions.
Press and hold the UP and DOWN arrow buttons until
the power LED blinks and continue to hold them for
another few seconds until the display switches to a
blinking
F.7
or
F.6
. Release the buttons and immedi-
ately press the UP or DOWN arrow button to change
the setting. When the buttons are released for about 2
seconds, the setting will be stored and the display will
return to the normal operating mode.
470
608
700 MHz
0
10
-10
dB
Filter Bandwidths
F.6
F.7
