M2 Antenna Systems 32 HO LOOP Manuale utente

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

M2 Antenna Systems, Inc.

Model No: 432 HO LOOP

Model .........................................432 HO LOOP

Frequency Range.......................430 To 436 MHz

Gain, Single @ 86 IN .................5.0 dBd @ 4 deg.

Gain, Stack @ 84 IN & 100 IN...8.8 dBd @ 4 deg.

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

Impedance .................................50 Ohms, Unbalanced

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

Feed Connector..........................Type “N” Female

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

Vehicle Mounting Height ........... 6” or more

Stacking Separation...................16”

Wind Area...................................0.015 sq ft.

Weight ........................................7 oz.

FEATURES:

The new 432 HO LOOP provides easy SSB and CW communications out to 200 miles or more. HO LOOPS produce an omni-

directional, HORIZONTALLY polarized signal ideal for mobile and base operations. Horizontal polarity permits the HO loop to pick up 5

dB from ground gain that verticals don’t get. As with most horizontally polarized antennas, performance improves dramatically with

height above ground. By stacking two HO LOOPS, another big gain jump occurs (see pattern and note the great reduction of high an-

gle lobes). For terrestrial use, the HO LOOP does not need groundplane, so mounting options are simplified. Mounting over a car roof

at 6 to 10 inches produces 2.5 dBd gain dome shaped pattern upward for LEO satellite operation while still maintaining modest terres-

trial performance. Physically, the 432 HO loop is a 4.313” square loop, fabricated from two 1/4” dia. aluminum rods to minimize losses.

The sealed feed block provides weather protection with minimum wind drag. The heart of this unique design is the shorted stub match-

ing to a 50 ohm coax feedline. Mounting is via a single 3/8" hole ( standard for most mobile hardware). For more performance, try the

HO LOOP-STACK PACKAGE:2 HO LOOPS, phasing lines, “T” junction block, upper and lower 1/2” mast sections. For easy base-

station installation, use the optional wall or mast mounting bracket and U-bolts. For a powerful mobile signal, stack and array of HO

LOOPS on our optional “BIG FOOT”, mag-mount shown above). Use the optional 5” magnet and the 18" mast for single band mobile

operation.

SPECIFICATIONS:

*Subtract 2.14 from dBi for dBd

The 432 HO loop comes partially assembled from the factory only slight adjustment of loop size and/

or shorting bar may be necessary .

1. Install the 8-32 x 1/4” set screw 2 places. ( pos. 1 and 2)

2. Insert the two loop halves into the blocks to achieve the dimensions shown. Align the loop halves

in the plane of the blocks and lightly tighten set screws.

3. TUNING: Mount the HO LOOP in its permanent location or on a temporary mast about 16” high or

higherwith the 3/8-24 x 1” bolt and locknut. Attach a good quality feedline and route it directly down

the mast. adjust resonant frequency first by moving the loop halves in or out in 1/32” increments.

Then adjust the match by varying the spacing of the shorting bar. Slight frequency adjustments are

also possible by varying the gap distance. Squeezing the loop lowers the frequency and opening the

gap raises the frequency.You should achieve a perfect match at your desired frequency between 430

and 440 MHz (typically at 432.100). Final tighten all set screws securely.

PART LIST

DESCRIPTION QTY

FEED BLOCK #1 (LARGE) 1

FEED BLOCK #2 (SMALL) 1

SHORTING BAR 1

LOOP HALVES, 1/4” ROD 2

BOLT, 3/8-24 X 1” 1

LOCK WASHER, 3/8” SPLIT RING 1

SET SCREW, 8-32 X 1/4 2

ALLEN WRENCH 5/64” 1

4402 N. Selland Ave. Fresno, CA 93722 (559)-432-8873 Fax 559-432-3059

www.m2inc.com Email: [email protected]

432 HO LOOP ASSEMBLY MANUAL

HO LOOP, STANDARD PARTS LIST

DESCRIPTION QTY

H.O. Loop Half 2

H.O. Feed Assembly with N-Male Conn 1

H.O. Shorting Bar 1

Set Screw, 8-32 x 1/4 S.S. 2

Allen Wrench, 5/64 1

Bolt, 3/8-24 x 1” SS 1

Washer, 3/8 Split Ring SS 1

Assembly Manual 1

HO LOOP ADD ON MAG-MOUNT KIT

DESCRIPTION QTY

5” Magnet 1

Mylar Cover 1

Mast, 5/8 x 18” 1

Bolt, 3/8-24 x 1/2 S.S. 1

Flatwasher, 3/8 S.S. 2

Cable Ties 2

HO LOOP-STACK KIT ADD ON LIST

DESCRIPTION QTY

Coaxial Cable RG-59 x 3/4 w/l (17") 2

Loop mast, 1/2 x 6" 1

Loop mast, 1/2 x 16" 1

Assembly Manual 1

HARDWARE BAG

Junction Block 1

Stud, 3/8 x 24 x 1 3/4" 2

3/8 flatwasher 4

Nut Seal 2

Cable ties 4

OPTIONAL: “BIG FOOT” 4 point mag-mount

432 HO LOOP PARTS & HARDWARE

MOUNTING & OPTIONAL KITS

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