Hy-Gain 488 User manual

INSTRUCTION
M NU L
General
Description
ORDER NO. 488
Fiberglass base station antenna
o /WHIP FITTING
1
I/MAST
QI
I
/FERRULE
I
/
COAX w/CONNECTOR
.. I~
This versatile fiberglass antenna and mount offer a variety of new base station antenna
features.
The mount - The mounting angle is completely adjustable to your specific needs. Mount
your antenna on any surface at any angle. No ground plane radials are required.
The antenna- The fiberglass mast is topped with a stainless steel whip. This loaded
Y2-wave antenna is tactory pretuned for best performance. The tuning unit in the base is
completely sealed for protection against weather.
The 488 antenna comes cumplete with everything you'll need for installation: mounting
base, 50 feet of coax, a solderless connector, and mounting hardware.

Overall length ' .122,5 inches (311,15 cm)
Input impedance .50 ohms
Frequency range .... '.,. .,.,. ,27 MHz (entire Citizens Band)
Connector ., .. ,. .... ,.,.,. ,AMP solderless connector
Installation
Instructions Determine where to install your antenna, keeping in mind that itshould be within the 50 foot
coax length from your transceiver, Mount it as high as possible away from TV antennas
and other similar obstructions,
Be sure that the mounting area is strong enough to support the mount and the antenna.
Backing plates may be used for reinforcement.
Use the mounting base as a template to mark where the installation holes will be drilled.
Use the mounting hardware provided to install the mount.
NOTE Be sure the flat washers are placed between the bolts and the top surface of
the mount.
C UTION
When tightening the hardware in any material such as Lexan, it is difficult to feel how
tight the bolt is. For installation of the mount, the maximum recommended torque for
the mount hardware is .46 kg/ m (40 in./Ibs. . If a torque wrench is not a vailable, watch
the screws heads as they are being tightened. The mounting hardware should not
cause more than aslight indent on the base material. Over-tightening the mounting
hardware may cause failure of the mount and will void your warranty.
Installation of
the Antenna Insert the stainless steel whip in the whip fitting on the top of the fiberglass mast. Use the
No, 8 allen wrench to tighten the set screw securely,
Ratchet
Adjustment Move the handle on the mount until it is in an upright position. This releases the teeth on
the ratchet foldover of the mount. Align the mount so that it stands in an upright position,
then return the handle to a down position and tighten it securely.
Use this scale to identify lengths of bolts, diameters of tubes, etc, The English inch ( ) and
foot (') can be converted to centimeters in this way.
1 inch (1 ) = 2,54 em
1 inch (1') = 30.48 cm
Example:
42 x2,54 = 106.7 cm

Routing the
Coax Run the coaxial cable to your transceiver. Be careful not to let the coax rest in a place
where it can be damaged.
/
FLATSIDE
TOWARD
• ANT __EN§:::~. I~ ~~
~ L~~I-
1. Slip the collar and shell over the cable. Be sure the flat edged side of the
collar is toward the antenna.
(22~ Clm)
BRAID_
CENTER
\ -CONDUCTOR
INSULATOR
2. Remove the outer jacket of the cable. NOTE: Do not nick or cut the
strands of the coax braid.
3. Flair the braid and remove the white plastic sieeve beneath it to within
Va of the flaired braid. Do not nick the center conductor.
4. Insert the center conductor of the coax cable into the contact assembly.
Bend the protruding end of the conductor over the end of the contact.
Mold the braid uniformly over the contact assembly.
--~.
5. Butt the end of the contact against a firm surface and push the shell
over the braid.
FLANGE OF
~ONTACT ASSEMBLY
~
6. Use pliers to press the contact assembly into the shell as shown. Apply
pressure around the circumferance of the assembly. The flange of the
center conductor should butt against the shell.
9. Cut off any excess center conductor that extends beyond the end of the
contact.

Special Tuning
Instructions NOTE: This antenna is factory pretuned for optimum performance. Further tuning of the
antenna is possible, but this procedure should only be done by a person who is
experienced with antennas and wave frequencies.
( ) Use only a NON METALLIC screwdriver to adjust the tuning capacitor which is
located 6 to 8 from the bottom end of the antenna.
( ) Grasping the base ferrule with one hand, hold the antenna at arm's length, with the
antenna as nearly vertical as possible.
( ) Adjust the tuning capacitor for the minimum VSWR reading on the bridge. The
resonance dip to the minimum VSWR is very sharp, so adjust the capacitor slowly.
Part No.
280087
280126
511577
515852
690090
870759
878880
878904
536275
567120
650062
531579
351787
878922
878935
Description Qty
ferrule ........................•............... 1
whip fitting 1
6 x 5/16 pan head . . . . . .. . .. . .. . . .. .. .. .. .. 1
8 x % pan head. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1
50 ft. coax 1
coil assembly 1
fiberglass whip assembly 1
parts pack 1
'4 x 2 hex head lag screw 4
.v. flatwasher 4
Amp field installed connector 1
8-32 x Yo cupset screw 1
#8 allen wrench 1
whip assembly 425 , 1
ratchet mount assembly . . . . . . . . . . . . . . . . . . .. 1
Most roofing compounds or caulks can be used to seal the mount. If silicone sealant is
used, use ONLY GEor Dow Corning.
Hy-Gain Electronics Corporation warrants each new product manufactured to be free
from defects in material and workmanship and agrees to remedy any such defect or to
furnish a new part in exchange for any part of any unit which under normal installation.
use, and service. discloses such defect within the ninety-day term of this warranty,
dated from the date of purchase by the originai owner. This warranty applies only tothe
original purchaser.
This warranty does not extend to any of our products which have been subjected to mis-
use neglect accident incorrect wiring not our own improper installation or to use in
violation of Instructions furnished by us. Nor does It extend to units which have been
repaired or altered outside of our factory. nor to accessories used therewith not of our
own manufacture. Hy Gain Warranty Service
Hy-Gain Electronics Corporation
4900 Superior Ave.
Lincoln. Nebraska 68504
Hy-Gain Electronics Corporation reserves the right to make any changes deemed
necessary or desirable without advance notice or incurring any obligation to make like
changes in units previously manufactured or sold.
You must furnish model number, date, place, and proof of purchase, such as acopy of
the sales receipt to establish warranty. Your letter should include all pertinent details
along with part or item numbers involved. Do not return anything until requested to do
so. No warranty card is furnished; you must supply the above information.
This warranty does not cover transportation costs that may be incurred. Hy-Gain
Electronics Corporation's sole liability is the remedy of any defect for the ninety-day
period of this warranty. Hy-Galn Electronics Corporation is not responsible for
Printed in U.S.A.
Copyright ©1976 by.Hy-Gain Electronics Corporation
All rights reserved.
Any returned items must have prior authorization. Unexpected returns are greatly
delayed in handling. These delays can beavoided by writing in advance and furnishing
the necessary information.