HF50CX
50-54 MHz Mobile Antenna
Instruction Sheet
The HF50CX is a 6m adjustable mono-band, 3/8 wavelength mobile antenna, optimized for 6m amateur band.
Tunable bandwidth 1 MHz from 50-54 MHz.
Specifications
FREQUENCY: 50-54 MHz
GAIN:3.5 dBi
POWER: 200 Watts
IMPEDANCE: 50 Ohms
VSWR: 1.5:1 (Nominal)
ELEMENT PHASING: 3/8 Wave
GROUNDING: Required for optimum performance
LENGTH: 71” (fully extended)
WEIGHT: 0.95 lbs. (440 g)
MOUNT: UHF MALE (PL259)
WARRANTY: 1 Year against defects in material or workmanship.
RECOMMENDED MOUNTS: K400C or K600M Trunk Mounts.
Installation Instructions
NOTE: THIS ANTENNA REQUIRES TUNING TO DESIRED OPERATING FREQUENCY. USE QUALITY VSWR
METER TO INSURE PROPER ADJUSTMENT. THE HF50CX REQUIRES PROPER VEHICLE GROUND.
MOUNTING LOCATION WILL AFFECT VSWR. NOT RECOMMENDED FOR MAGNET MOUNTS.
(1) Remove antenna from package and inspect contents to insure it is complete. Attach whip element assembly #001701
to center loading coil assembly #001702. (Illustration 1 & 1A)
(2) Choose desired mounting location to insure maximum strength of mount, and proper vehicle ground to yield best
performance of antenna.
(3) Install antenna on vehicle. With quality VSWR meter, check VSWR for proper antenna tuning. Tuning adjustments
may be required to reach optimum VSWR.
1.5
1.0
+0.5 MHz–0.5 MHz fo
Tuning of Antenna
Loosen element lock nut and slide antenna whip up or down. Tune until lowest VSWR is obtained at desired center
frequency. Tighten adjustment lock nut. Recommend using removable Locktite Threadlocker #242 or similar product to
insure proper fastening of setscrews and element assembly. (Illustration 2 & 3)
(Note: Mounting location and mounting structures will effect RF grounding and resonant frequency. If adjustment of whip
is necessary, adjust in 1/8-inch increments until desired resonant frequency is obtained.)
(4) The HF50CX has a fold-over hinge for situations where the antenna height is a problem (see illustration 4). Simply
unscrew the fold-over lock, lift up, and tilt over 90°. Care should be taken when folding over, not to damage vehicle or
whip/loading coil assembly. Do not drive with antenna in folded position.
DIAMOND ANTENNA Products are distributed by RF PARTS COMPANY
435 S. Pacific Street•San Marcos, CA 92078 •(760) 744-0900
www.diamondantenna.net
upper whip element
element lock nut
adjustment element
insert the element
and fasten firmly with
a hexagonal wrench
(included).
center loading
coil section
#1
center loading coil section
lower element
#1A
upper whip
element
loosen fastening screw
#2
Adjust to desired center frequency by
sliding the element in and out.
#3
element assembly
#001701
center loading coil assembly
#001702
set screw #001706
#4
L-shaped hexagonal wrench
#001705
lower element #001703
matching coil assembly
(folding whip included) #001704
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