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To use this antenna properly, read these instructions thoroughly
before using the antenna. Keep this manual at hand for later use.
This antenna is designed for amateur radio communications use
only. Do not transmit out of specified bands.
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Note for Using the Antenna
To avoid accidents, read the following notices:
1. Do not touch the antenna during transmission.
2. Adjust the antenna on operating frequency before using. Using an
unadjusted antenna may cause damage to the radio. You may not
have the desired gain during receiving if you don’t adjust the ele-
ments for the proper frequency.
3. Strong impact on elements can cause them to break.
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Description
1. MAY1000, Wide Band Portable Beam Antenna, is designed to pro-
vide optimum performance over wide frequency range by adjusting
element length and spaces between elements (120-500MHz).
2. Elements are made of stainless steel that’s hard to break.
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Specifications
Frequency: 120–500MHz
Gain: 4.5-6.0dBi
Impedance: 50Ω
VSWR: Less than 1.5:1
Max Power Rating: 10W (FM)
Connector: BNC
Cable Length: 39”
Length: 20.5”
Weight: 1 lb.
Element Length: 11.4"-51.5"
Space Between Elements: 4.75"-13.75"
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Use and Adjustment
1. Referring to the Frequency Adjustment Chart, confirm the
element length and space depending on the desired frequency.
2. Adjust the elements following the Frequency Adjustment Chart.
Fix the R Element as two elements are parallel when looking at
the antenna straight.
3. Connect the receiver or radio with the feed line.
4. Adjust the elements to have a good reception for receiving by
changing the antenna dimensions. Use the antenna vertically or
horizontally, depending on radio waves received (vertical polar-
ization / horizontal polarization).
** Receiving reception will totally be changed horizontally or
vertically.
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How to Fold the Elements
Push the lever on 5mm to the arrow and hold the bottom of the
element and fold it slowly. Elements could be folded omni-
directionally.
When you want to make the element straight, hold the bottom of the
element and return it naturally.
DIAMOND ANTENNA Products are distributed by RF PARTS COMPANY
435 S. Pacific Street • San Marcos, CA 92078 • (760) 744-0900
www.diamondantenna.net
MAY1000
120-500 MHz Wide Band Portable Beam Antenna
Operation Instructions
P Element
Part# M21001
Thumb Screw
Part# M21003
BNC
Connector
R Element
Part# M21002
Antenna
Part# M21004
Hand Grip
Feed Line
Tape Measure
Part# M21006
Frequency Adjustment Chart
Part# M21007
Folding Antenna Element
Lever for folding
Pull up and lay down
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Parts List