- 15 -
For access to the jumpers, loosen the two #2 Phillips Screws on each
side of the
AVA-2
unit and remove the chassis from the bottom.
The circuit board and jumper headers will be visible as shown in
Figure 9
.
The
AVA-2
has five internal jumpers that modify frequency versus gain response. The L
jumpers change the inductance values and C jumpers change the capacitance values. As shipped, all
jumpers are deactivated.
Figure 9 - Low Frequency
Jumper locations & Settings
Installing jumpers in L1MF, L1HF or both, will configure the antenna for a sensitivity peak near the
frequencies listed in
Figure 9
. The frequency response above the peak frequency does not change
significantly. Below the peak frequency, sensitivity reduction is reasonably fast. Installing a jumper
in any C1 position when jumpers are being used in L1 will move the peak response lower in
frequency, decreasing sensitivity at higher frequencies.
Using the Active Receive Verticals in a 4 Square or 8 Circle Array
Use the DX Engineering Receive Four Square System (
DXE-RFS-3P
) and four Active Receive
Antennas (
DXE-ARAV3-4P
system package) to configure a four square vertical array. Power and
receiver connections are provided through the
RFS-3P
system. Use the Receive Eight Circle system
(
DXE-RCA8-SYS-4P
) and eight Active Receive Antennas (
DXE-ARAV3-8P
system package) to
configure an eight circle receiving array. Power and receiver connections are provided through the
RCA8-SYS
system.
