M2 Antenna Systems 35.7-4 Manuel utilisateur

M2 Antenna Systems, Inc.

Model No: 35.7-4

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

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

08/30/22

Rev.01

Model .........................................35.7-4

Frequency Range.......................35.4 to 36 MHz

Gain............................................10.89 dBi

Front to back ..............................22 dB Typical

Feed type ...................................“T” Match

Feed Impedance. .......................50 Ohms Unbalanced

Maximum VSWR ........................1.5:1 Typical

Input Connector..........................“N’ Connector

Power Handling ......................... 1.5 kW

Boom Length / Dia..................... 20’ / 2”

Element Length / Dia................. 188” / 7/8”-1/2”

Turning Radius: ......................... Call

Stacking Distance...................... Call

Mast Size................................... 2” to 3 ” Nom.

Wind area / Survival .................. 3.8 Sq. Ft. / 100 MPH

Weight / Ship Wt........................ 40 Lbs. / 45 Lbs.

FEATURES:

The 35.7-4 has been computer optimized from the ground up for gain and pattern covering 35.4-36 MHz. Originally

designed for Meteor Scatter and monitoring systems. The custom 1:1 Fairite balun and low loss hairpin match help

maintain high efficiency. Element ring clamps and other important components are CNC machined for maximum strength

and electrical integrity. All antenna hardware is stainless steel and the U-bolts for mounting are Zinc plated.

M2 antenna Systems, Inc., has well over 35 designs for Meteor Scatter applications covering from 39 MHz to 50 MHz. If

you have a specific requirement, please contact us for more details.

SPECIFICATIONS:

*Subtract 2.14 from dBi for dBd / FS = Free Space

35.7-4 ASSEMBLY MANUAL

1. Refer to the Dimension Sheet. Note the approximate position of each element. Slide the 2” RING CLAMPS

into their approximate positions on the boom, element channels to top. If necessary, spread the ring clamp

fingers with a flat blade screwdriver to ease movement on boom. Loosely add a 1/4-20 x 1” bolt and locknut to

fingers of all clamps.

2. Mount the “T” MATCH ASSEMBLY BLOCK to the underside of the boom using the 1/4” hole 54-3/8” from

the rear end. Secure with a single 1/4-20 x 2-1/4” bolt. Orient the two connectors towards the front. Make sure

the Driven Element ring clamp is to the rear of the “T” match block. Now slide the ring clamp up against the “T”

match block and tighten the 1/4-20 x 1” bolt and locknut to hold the clamp in position.

3. Select the two 3/4” ELEMENT SECTIONS by length specified on the Dimension Sheet for the driven

element and slide a 4-3/8” long SHORTING BAR onto each one. Position them roughly in the middle of the

tubing.

4. Slide the butt end (with hole) of each 3/4” ELEMENT SECTION halfway into a 7/8” x 30” CENTER SLEEVE

and line up holes. Slide a 1/4-20 x 1-3/4” bolt through each hole and place this assembly into the Driven

Element ring clamp channel. Add the 1/4” locknuts and tighten.

5. Add the 8-32 x 1-1/4” screw and locknut and the two 8-32 x 1/4” set screws to each SHORTING BAR. Slide

the shorting bars down onto the 1/4” “T” MATCH rods and position them according to the Dimension Sheet.

Align the rods parallel with the element sections and tighten the hardware. A 5/64 Allen wrench has been

provided for the set screws.

6. Pair up the remaining 3/4” element sections and 7/8” x 30” sleeves and mount to the ring clamps as in step

#4, following the Dimension Sheet for length.

35.7-4 DIMENSION SHEET

35.7-4 ASSEMBLY MANUAL

7. Now adjust the ELEMENT SPACING to match the Dimension Sheet. Since the Driven element is fixed, use

it as the reference for setting the position of the Reflector, 52-1/2” to the rear. Then space all Director elements

forward, using the Driven element as the reference. Dimensions given are “center to center” and can also be

used “edge to edge” when working with a measuring tape. After setting spacing of each element, align it

parallel with the Driven Element and tighten the 1/4-20 x 1” bolt.

8. Attach the balun coil to the pair of connectors on the “T” match block. Secure balun with the nylon ties

supplied (ties should be snug, but not crushing cable). Bottom connector on block is for your 50 Ohm feedline.

9. Locate the balance point of the antenna and mount the BOOM TO MAST PLATE, 6” length horizontal.

Orient for desired polarity and secure with two heavy duty 2” U-bolts, cradles, 3/8” stainless lockwashers and

nuts. Two 2” U-bolts are supplied for attaching the antenna to the mast. If the feed connector will not be

accessible after installation, connect a feedline section now that reaches at least to the boom to mast plate.

10. This completes the ASSEMBLY. When the antenna is installed in position on the mast, the main feedline

can be attached. REMEMBER to support the feedline at the antenna boom exit point and on the mast. Allow

enough slack feedline to permit full rotation of the antenna.

Carefully designed and manufactured by:

M2 Antenna Systems, Inc.

4402 N. Selland Ave.

Fresno, CA 93722

(559) 432-8873 Fax (559) 432-3059

www.m2inc.com email: [email protected]

35.7-4 PARTS & HARDWARE

DESCRIPTION QTY

BOOM SECTION, 2” x.125 x 240” STR ................................................... 1

ELEMENT SECTION, 3/4” X SEE DIMENSION SHEET.......................... 8

ELEMENT SLEEVE, 7/8” X .058 X 30” (FOR 2” RING CLAMP) .............. 4

BOOM TO MAST PLATE, .250” X 4” X 6”................................................ 1

DRIVEN ELEMENT ASSEMBLY ............................................................. 1

BALUN, RG-6........................................................................................... 1

RING CLAMP, 2”...................................................................................... 4

U-BOLT AND CRADLE, 2” HD................................................................. 4

ASSEMBLY INSTRUCTIONS .................................................................. 1

IN HARDWARE BAG

SHORTING BARS, 1/2” X 1” X 4.375” ..................................................... 2

NUT, 3/8-16 SS........................................................................................ 8

LOCKWASHER, 3/8 SPLIT RING SS ...................................................... 8

BOLT, 1/4-20 X 2-1/4” SS ........................................................................ 1

BOLT, 1/4-20 X 1-3/4” SS ........................................................................ 8

BOLT, 1/4-20 X 1” SS .............................................................................. 4

NYLOCK NUT, 1/4 SS ............................................................................. 12

SET SCREW, 8-32 X 1/4” SS .................................................................. 4

SCREW, 8-32 X 1-1/4” SS ....................................................................... 2

NYLOCK NUT, 8-32 SS ........................................................................... 2

NYLON TIE, 11” ....................................................................................... 4

ALLEN WRENCH, 5/64”........................................................................... 1

M2ANTENNA SYSTEMS, INC.

4402 N. SELLAND AVE.

FRESNO, CA 93722

(559) 432-8873 FAX: (559) 432-3059

www.m2inc.com Email: [email protected]

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