M2 Antenna Systems 6M HO LOOP User manual

M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722

Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com

Rev.01

Model ........................................6M HO LOOP

Frequency Range......................50 To 50.3 MHz

Gain, Typical @ 11 ft.................4.2 dBd @ 25 deg.

Gain, 2 Stack @ 40 & 52 ft........8.2 dBd @ 6 deg.

Polarity ......................................Horizontal Omni

Impedence.................................50 Ohms Unbalanced

Power Handling. ........................800W, 1.5 kW for Stack

Feed Connector.........................SO-239

Mounting ....................................3/8-24

Vehicle Mounting Height............30” or more

Stack Distance Btwn Loops.......9ft to 12ft

Maximum Element Length.........0.1 sq ft.

Turning Radius:..........................2 lbs.

M2 Antenna Systems, Inc.

Model No: 6M HO LOOP

FEATURES:

Our new HO LOOP is a result of a continued evaluation and development on reduced size, omnidirectional HORIZONTALLY

polarized loops. This new design is easy to match in any situation. Performance is better than anything we have ever seen and its wide

bandwidth makes it immune to all weather conditions except heavy ice. Power handling is usually a problem with small loops but again

this design can handle 800 Watts with ease and a stacked pair could easily handle 1.5kW. The patterns will give you a good idea how

well the 6M HO LOOP will perform in your system. As with all horizontally polarized antennas, performance is usually tied to height

above ground but even at 10 feet the HO LOOP yields an amazing 3.8 dBd at an angle of 27 degrees. On a vehicle at 11 feet above

ground, the gain jumps to 4.2 dBd at 25 degrees! Twelve foot spacing is optimum for base station or portable use. Note the gain jumps

over 3 dB for a stacked pair with this unique antenna.

Physically the HO loop is 29.5 inches square with a wind area of just 0.1 square foot. The 3/8” diameter tubing keeps it light but

plenty rugged for mobile operation. The feed block is sealed and potted with silicon gel for extreme reliability and low loss. The feed

blocks slide on the tubes for frequency adjustment and the shorting bar adjusts for a perfect match into 50 Ohm feedline.

Two HO LOOPS can be stacked using odd quarterwaves of 75 Ohm coax into a “T”. Phase can be inverted by simply reversing the

feed block mounting as required.

Optional items include various lengths of mobile masts, our BIG FOOT monster mag base,”‘Universal Mast Mounting Kit” with ‘L’

bracket, U-bolts and misc. hardware for tower mounting. We also offer phasing cables and T connector for stacking.

SPECIFICATIONS:

*Subtract 2.14 from dBi for dBd

SUPPORT

BRACKET KIT

6M HO ONLY

MIDDLE OR TOP MOUNTING

ON 1-1/4 TO 2" MAST

UNIVERSAL MAST

BRACKET KIT

INCLUDES:

UNIVERSAL 'L' BRACKET

1-1/2 AND 2" UBOLT

3/8-24 X 1-1/2 BOLT

AND LOCKNUT

HALVES AND TIGHTEN THE

STEP #4

CAREFULLY ALIGN THE LOOP

SET SCREW LIGHTLY AT FIRST.

MAST (NOT SUPPLIED

6-32 X 1-1/4" SCREW

STEP #5 ATTACH THE SECOND

SUPPORT CLAMP ON ONE END

OF THE 3/8"SUPPORT TUBE. ADD

1 6-32 X 1-1/4" SCREW AND LOCK-

NUT. ADD THE 1/4-20 X 1" BOLT.

STEP#6 CONNECT THE OTHER END

OF THE SUPPORT TUBE TO THE

OTHER SUPPORT CLAMP WITH

A 6-32 X 1-1/4" SCREW AND

LOCKNUT. 1/2 TO 3/4" DIA.

3/8"SUPPORT TUBE

& LOCKNUT.

2-3/8" TYP.

ADJUST FREQ.

SUPPORT TUBE

THESE TUBE ENDS

ARE NOT CRITICAL AND

CAN BE CUT OFF IS

NECESSARY FOR

MAST MOUNTING.

THE ANTENNA

STOPS HERE.

3.5 TO 4" TYP.

(ADJUSTS MATCH)

& LOCKNUT 2PL.

6-32 X 1" SCREW

6-32 X 1-1/4" SCREW

& LOCKNUT.

SUPPORT CLAMP

SO-239 CONNECTOR

SUPPORT CLAMP

ADJUST UP OR DOWN

TO MAKE HO LOOP

LEVEL.

1/4-20 X 1" BOLT

STEP #2

INSTALL THE 1/4-20 X 1/4"

SET SCREWS IN THE

CONNECTOR BLOCKS

AND SLIDE ONTO THE

TUBES TO 1-1/2" TYPICAL.

3/4" X 5" POLYETHYLENE

STEP #1 SLIDE ON ONE SUPPORT

CLAMP AND CENTER AT 2-1/4"

ON TO THE WHITE CENTER

INSULATOR. INSTALL A 1/4-20 X 1/4"

SET SCREW. INSERT THE HO LOOP

TUBES INTO THE CENTER

INSULATOR. INSTALL SCREWS

AND LOCKNUTS AND TIGHTEN.

SHORTING / MOUNTING

BAR AND SET TO 4".

STEP #3

INSTALL THE 1/4-20 X 1/4"

SET SCREWS IN THE

CENTER INSULATOR.

2-1/4"

1/4-20 x 1/4"

SET SCREW

6M HO LOOP ASSEMBLY MANUAL

DURING THE TUNE UP PROCEDURE, YOU MUST BE AT 20 FEET

FROM WALLS AND OTHER LARGE OBJECTS. REMEMBER THIS IS

AN OMNI DIRECTIONAL ANTENNA AND IT HAS A LARGE FIELD.

RESONANCE AND MATCH WILL BE AFFECTED.

THE FINAL POSITION OF THE

SHORTING BAR DETERMINES

THE MATCH. A PERFECT MATCH

CAN BE ACCOMPLISHED BY

CAREFUL ADJUSTMENT.

DROPLETS OF WATER WILL

CAUSE THE LOOP TO GO DOWN

IN FREQUENCY. WE SUGGEST YOUR

BEST MATCH WHEN DRY IS AT OR

SLIGHTLY ABOVE 50.200.

1:1

1.2:1

49.0

1.5:1

50.0 51.0

TYPICAL VSWR CURVE

2:1

3-1/4 TO 4" TYP.

1/2 TO 3/4" MAST

(NOT SUPPLIED,

SOLD AS OPTIONAL ITEM)

SECOND FOR BEST MATCH

MOVE SHORTING BAR

DESCRIPTION QTY

HO LOOP 3/8" BENT TUBES 2

SUPPORT TUBE, 3/8X23.5" 1

FEED BLOCK ASSEMBLY 1

SHORTING BAR 1

CENTER INSULATOR 1

SUPPORT CLAMP 2

BOLT, 3/8-24 X 1" SS 1

LOCKWASHER, 3/8 SPLIT RING SS 1

BOLT, 1/4-20 X 1" SS 1

SET SCREW, 1/4-20 X 1/4' SS 7

SCREW, 6-32 X 1-1/4" SS 2

SCREW, 6-32 X 1" SS 2

NUT, 6-32 NYLOCK 4

ALLEN WRENCH 1/8" 1

ASSEMBLY SHEET 1

PART LIST

SUPPORT CLAMP

ADJUST UP OR DOWN

TO MAKE HO LOOP

LEVEL AFTER FINAL

TUNING ADJUSTMENTS

ARE COMPLETED.

FREQUENCY ADJUSTMENT

MOVE BLOCKS FIRST FOR

3/8 X 24 X 1" BOLT

AND FLAT WASHER

6M HO LOOP ASSEMBLY & PARTS LIST

UNIVERSAL MAST

BRACKET KIT

SUPPORT

BRACKET KIT

6M HO ONLY

INCLUDES:

UNIVERSAL 'L' BRACKET

1-1/2 AND 2" UBOLT

3/8-24 X 1-1/2 BOLT

AND LOCKNUT

BIG FOOT MAG MOUNT WITH

OPTIONAL HO LOOPS FOR

OTHER BANDS.

UNIVERT MAST BRACKET KIT

FOR 1-1/4 TO 2” MASTS

MOUNTING AND OPTIONAL KITS

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