cr8900 Antenna

CR8900A
10m/6m/2m/70cm FM Mobile Antenna
Optimized for Trunk Lid Mounting
Instruction Sheet
The CR8900A is a 10m/6m/2m/70cm FM Quad Band Mobile antenna. Specifically designed to work with Yaesu
model FT8900R radio. (Tuned for FM segment of each Amateur band.)
Specifications
FREQUENCY: 29.5-29.7/51-54/144-148/440-450 MHz
GAIN: 2.15 dBi (10m/6m), 2.15 dBi (2m), 5.5dBi (70cm)
POWER: 60 Watts FM
IMPEDANCE: 50 Ohms
VSWR: 1.5:1 (Nominal)
ELEMENT PHASING: 1/4 Wave (29/50), ½ Wave (2m), 2-5/8 Wave (70cm)
GROUNDING: Required for optimum performance
LENGTH: 49 1/2"
WEIGHT: 1.2 lbs. (490g)
MOUNT: UHF MALE (PL259)
WARRANTY: 1 Year against defects in material or workmanship.
RECOMMENDED MOUNTS: K400C, K400S, K600M or K600S trunk mounts.
INSTALLATION INSTRUCTIONS
NOTE: THIS ANTENNA REQUIRES TUNING TO DESIRED FREQUENCY. USE QUALITY VSWR METER
TO INSURE PROPER ADJUSTMENT. THE CR8900A REQUIRES PROPER VEHICLE GROUND.
MOUNTING LOCATION WILL AFFECT VSWR. NOT RECOMMENDED FOR MAGNET MOUNTS OR
MOUNTING IN CENTER OF ROOF.
(1) Remove antenna from package and inspect contents to insure it is complete.
(2) Choose desired mounting location to insure maximum strength of mount, and proper vehicle ground to yield best performance of antenna. NOTE: MATCHING NETWORK IS COMPENSATED FOR TRUNK LIP MOUNTING AND IS NOT RECOMMENDED FOR CENTER ROOF MOUNTING.
(3) Install antenna on vehicle. Be sure the mount has screws contacting Trunk Lid.
(4) With quality VSWR meter, check VSWR of each band for proper tuning.
DIAMOND ANTENNA Products are distributed by RF PARTS COMPANY 435 S. Pacific Street • San Marcos, CA 92078 • (760) 744-0900
www.diamondantenna.net
ANTENNA TUNING:
Check VSWR on 6 meters first. Loosen set-screws (020907) on base coil (020906) to raise or lower center frequency. Upon reaching accepted VSWR on 6m &2m, tighten set-screws (020907). Tune ````````` 10m by adjusting the tuning whip (020901). Raising the tuning whip (020901) will effect both 6m and 10m center
frequency. It is best to tune the 6m band first to reach optimum center frequency, then proceed to adjust for 10m optimum center frequency. Tune until satisfactory VSWR is obtained at both 6m and 10m center frequency. Verify setting results in best fit for each band. Tighten set screw (020908) using removable Loctite Threadlocker #242 or similar product to insure proper fastening of setscrews and whip section.
Should you have difficulty in tuning the 10m & 6m bands, the cause would be most likely attributed to grounding characteristics of the vehicle trunk lid. It is sometimes necessary to add short grounding straps or copper braid from trunk lid to body panel (to lower resonant frequency).
Typical VSWR curves for
CR8900A with Diamond K400S Trunk Mount
You may expect your results to vary somewhat, depending upon mount used, and individual grounding characteristics of trunk lid, etc.
→
Adjust for best
VSWR at
52.5 MHz
& 146 MHz
(10 meters)

GW1NGL NA7KR Kevin Roberts Ham Radio

Page last updated on 09/10/2012 by Kevin Roberts NA7KR a colection of Ham Radio and Electronic Information