M2 Antenna Systems 32 HO LOOP User manual

M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
Tel: [phone] Fax: [phone] Web: www.m2inc.com
©2011 M2 Antenna Systems Incoporated 11/02/11
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 [phone]
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