Assembly - L-950 LF Active Loop Antenna
The Loop Antenna is in a partial kit form and must be assembled carefully
to prevent damage to the wire loop - do not twist or kink.
Tools Required: medium size Phillips style screwdriver,
and a paper clip to be used as a guide pin.
Parts List:
Quantity
1
2
1
1
Description
Top Assembly
Pipe Legs
Main Loop Assy.
Handle/Mount
Part Number
E6010
L6020
A6030
H6040
1. Insert the two pipe legs into the main loop assembly and the top
assembly to the legs. Note the guide markings on the two legs.
2. Use paper clip to align the elbow and leg holes.
Assemble with the four side screws provided.
3. Remove the top corner clips and screws. Carefully mount the loop to
the top corner clips and reattach to the corner elbows.
4. Assemble the handle/mount to the main frame and tighten.
Connections - L-950 LF Active Loop Antenna
1. Connect a coaxial cable between the antenna preamplifier and the
coupler interface box. Connect the supplied jumper between the
coupler and your receiver.
2. Connect the 12 vdc power supply to the coupler to provide power to
the antenna preamplifier.
Operation - L-950 LF Active Loop Antenna
Rotate the loop for the best nulling or peaking of signals that you desire
to monitor. As little as 10 degrees of rotation can null or peak a signal.
Use the L-950 antenna with a good VLF receiver for best results.
For permanent outdoor mounting on a pole, marine 1-14 mount, or rotor,
we suggest that the BNC coaxial connection to the preamplifier be weather
proofed with sealant (supplied), and that sufficient cable strain relief be
provided. For rotor mounting we recommend a rubber surround be used
between the pvc mount and the rotor mast clamp.
Directional Finding Application - L-950 LF Active Loop Antenna
A unidirectional scheme using the L-950 Loop, SPL-2 Combiner and the
L-400B E-probe works well in the LF region from 20 kHz to over 500 kHz
for direction finding applications.
1. On a known location signal, peak the signal on the loop with the
potentiometer set in minimum position; observe S-meter level.
2. Null the signal with the loop, adjust the potentiometer for the same
level observed on the S-meter.
3. Mark reference loop for either peak or null.
4. Readjust null in null position.
Receiver
Coupler
L-950
Loop
SPL-2
Coupler
H-900
E-Probe
Antenna with
signal amp on.
Adjust/calibrate pot
5k
Ω
