MFJ MFJ-57B User Manual
MFJ – 57B Instruction Manual PVC Cross Loop Antenna Kit
1
MFJ-57B PVC Cross Loop Antenna Kit
Introduction:
The MFJ – 57B PVC Cross Loop Antenna Kit is designed to be used along with the MFJ933, MFJ-935B and MFJ-936B Small High Efficiency Loop Tuners to provide coverage
on 10.100 – 14.350 MHz by using only one loop length. The length provided in this kit,
13-feet, is designed to be most efficient on 14.350 MHz, and the loop can be tuned lower
in frequency with some efficiency loss. Exact frequency coverage and efficiency depends
on each individual installation involving shape of loop, height above ground level, and
operating environment.
Loop Length Band Coverage
13 feet- - - - - - - - - - - - - - - - 30 – 20 Meters (10.100 – 14.350 MHz)
Parts included in this kit:
• 3 – PVC Cross Arms, Notched for loop wire
• 1 – PVC Cross Base, Un-notched
• 1 – PVC Cross Connector
• 1 – Insulated, 10 gauge Flexible Loop wire for 30 – 20 Meters, 13 ft long with
low resistance lugs
Installation Instructions:
1. Assemble the PVC Cross Mount as shown in Figure 1.
a. Place Notched PVC Cross Arms (2) on each side and top of the PVC Cross
Connector (3).
b. Place Un-notched PVC Cross Base (4) on the bottom of the PVC cross
Connector (3) and fit into the Cap (5) on the top of the Loop Tuner (6) as
shown in Figure 1.
2. Place the Loop Tuner (6) at the chosen place of operation and attach the Flexible
Loop (1) as shown in Figure 1.
a. Place the Flexible Loop (1) wire around the PVC cross mount and fit into
the notches on the Notched PVC Cross Arms (2) forming a loop.
b. Attach the lugs to the rear panel of the tuner using the wing nut terminals
provided on the back of the Loop Tuner.
3. Read and follow Loop Tuner instruction manual for system operation.
MFJ – 57B Instruction Manual PVC Cross Loop Antenna Kit
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Flexible
Loop
(1)
Notched PVC
Cross Arms
(2)
PVC
Cross Connector
(3)
Cap
(5)
Un-notched
PVC
Cross Base
(4)
Loop
Tuner
(6)
Figure 1: PVC Cross Mount Loop
Assembly
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