Diamond Antenna CR8900A User Manual

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

Diamond Antenna CR8900A Specifications

General

Brand	Diamond Antenna
Model	CR8900A
Category	Antenna
Language	English

Summary

Antenna Specifications

Frequency, Gain, and Power Ratings

Details frequency range, gain across bands, and maximum power handling for the CR8900A antenna.

Impedance, VSWR, and Phasing

Covers impedance, nominal VSWR, and element phasing configurations for different bands.

Physical Characteristics and Mount

Information on antenna length, weight, mount type (UHF Male PL259), and warranty.

Recommended Mounts

Lists compatible trunk mounts like K400C, K400S, K600M, or K600S for the CR8900A.

Installation and Tuning Procedures

Critical Installation Notes

Emphasizes tuning, VSWR meter use, proper vehicle ground, and advises against magnet mounts or center roof mounting.

Step 1: Inspect Contents

Instruction to remove antenna from packaging and check all components for completeness.

Step 2: Choose Mounting Location

Guidance on selecting a mounting location for strength and proper vehicle ground for best performance.

Step 3: Install Antenna

Instruction to install the antenna on the vehicle, ensuring mount screws contact the trunk lid.

Step 4: Check VSWR

Instruction to use a VSWR meter to check and tune each band for proper operation.

Antenna Tuning Guide

Tuning Procedure for Bands

Detailed steps for tuning 6m, 2m, and 10m bands using set-screws and tuning whip adjustments.

Grounding Considerations for Tuning

Explains how vehicle grounding characteristics can affect 10m & 6m band tuning and suggests solutions.

VSWR Curves and Adjustments

Illustrates typical VSWR curves for different bands and points to specific adjustment locations.