M2 Antenna Systems 393CP18 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.00

Model .........................................393CP18

Frequency Range.......................389-396 MHz

*Gain ..........................................14.39 dBi

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

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

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

Maximum VSWR........................1.6:1 Typical

Input Connector..........................“N” Female

Power Handling..........................1 kW

Boom Length / Dia......................80” / 1”

Maximum Element Length..........16”

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

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

Mast Size....................................1-1/2” to 2” Nom.

Wind area / Survival ...................1.0 Sq. Ft. / 100 MPH

Weight / Ship Wt.........................7 Lbs. / 9 Lbs.

M2 Antenna Systems, Inc.

Model No: 393CP18

SPECIFICATIONS:

*Subtract 2.14 from dBi for dBd

FEATURES:

The 393CP18 is high performance circular polarized antenna with a remarkably clean pattern. The pattern is important in

order to match the antenna’s noise temperature with modern low noise preamps. This antenna is ideal for satellite work

but is also excellent for terrestrial uses like ATV, repeater operation, and long haul tropo DX.

The CNC machined driven element module is O-ring sealed and weather tight for low maintenance and long-term peak

performance. Internal connections are encapsulated in a space-age silicone gel that seals out moisture and improves

power handling. The 3/16” 6061-T6 rod elements are centered to minimize interaction and maintain good ellipticity.

Insulators are UV stabilized and locked in place with stainless keepers. Rugged construction, uncompromising

performance for the boom length: that’s the M2393CP18 !

393CP18 ASSEMBLY MANUAL

TYPICAL TOOLS REQUIRED: measuring tape, phillips screwdriver, 5/16”, 11/32, 7/16, and 1/2 spin-tite,

end wrenches and / or sockets. Heavy duty models may require larger sizes.

1. Lay out the boom sections and assemble using the DIMENSION

sheet as a guide for position and hardware.

2. Install the 8-32 x 1/4” set screw into each button insulator using

the 3/32” Allen wrench supplied.

3. Cut a strip of masking tape about 6” long. Fold the ends under and

stick the tape to a flat surface, stickey side up. Lay out the

elements by length and position as shown ON the DIMENSION

SHEET. Remove the REFLECTOR and find the rough center by

balancing it across finger. Push on a black button insulator to

about 1/2” from center. Insert the element through the holes at the

rear of the boom and install the second button. Install the 3/16”

rod DRIVEN ELEMENT as you did the reflector. Then continue

with the installation of the DIRECTORS. Note that the Director

Elements may not consistently diminish in length from rear

to front, so pay close attention to length and position.

4. Now begin centering the elements. Use a tape measure to

EQUALIZE the amount the element sticking out on each side of

the boom. Once centered, tighten the set screw in the insulators

on each side. After all are centered, sight down the antenna from

the rear and compare tip symmetry. Look for any obvious

discrepancies and correct if found. REPEAT THESE STEPS AND

INSTALL THE OTHER PLANE OF ELEMENTS. NOTE THEY ARE SHIFTED FORWARD ON THE BOOM

BY 1/4 WAVELENGTH.

5. Mount the special REAR DRIVEN / POLARITY SWITCH FEED BLOCK to the boom using two (2)

8-32 X 1-1/4" screws. Orient with feed and balun connectors as shown on the Dimension Sheet. The ‘T’ block

unit mounts just behind the rear REFLECTOR element with one more 8-32 x 1-1/4” screw

7. Thread a 3/8” SEAL-NUT fully onto each ‘F’ connector on each block, with black Neoprene side facing out.

Generally the balun is installed in one loop. Attach balun to the block connectors and tighten gently using a

7/16" end wrench. The two medium length cables are the !/2 wave baluns. Then back the Seal Nuts out and

finger-tighten firmly up against the face of the connectors (or tighten gently with 1/2" end wrench). Later,

after the phasing lines are installed form the balun coax and phasing lines close to the boom and secure with

cable ties (snug but not crushing or kinking the coax).

8. Install the 8-32 x 1/4” set screws )using the 3/32” Allen) wrench into the SHORTING BARS. Slide the bars

onto the 3/16” rod driven element tips and the 1/8" Feed Block Rods. Position the Shorting Bars as specified

on the DIMENSION SHEET: the distance given is between the outer face of the Feed Block and the inner

face of the Shorting Bar. Align the bars and rods with each other and tighten the sets crews. NOTE: the

shorting bar dimensions may be different on the OPTIONAL circular switched driven element.

9. Now attach the phasing cables. The long, 3/4 wavelength coax cable goes to the the front driven element. And

the short cable goes to the rear driven element. Tighten the connectors lightly with a 7/16” end wrench and

then run the seal nut up against the face to the connector and tighten just one turn past finger tight with a 1/2”

end wrench.

10. Route the cables close to the boom and avoid crossing or touching the element butts to minimize detuning.

This is a critical area if the antenna match is to be preserved. Because the cables can couple into the field of

each element set, it is important to route the cables as shown and use the cable ties provided to keep the

cables tight against the boom. THIS COMPLETES THE ANTENNA ASSEMBLY.

MASKING TAPE

OR EQUIVALENT

FACE UP

ELEMENT PREPARATION

ELEPREP

M. STAAL

5-24-05

FRONT DIRECTOR

REFLECTOR

393CP18 ASSEMBLY MANUAL

OPTIONAL MANUAL AZ-EL SYSTEM ASSEMBLY

1. Connect the two MAST CLAMPS SHELLS together loosely with four (4) 1/4-20 x 3/4” bolts.

2. Attach the mast clamps to the “TACO SHELL” ELEVATION U BRACKET using two (2) more

1/4- 20 x 3/4” bolts. Add two more 1/4-20 x 3/4 bolts, lock washers and flat washers to control the

elevation tilt angle.

3. Secure THE SPECIAL 3” X 8” X 1/4” PLATE to the elevation tilt bracket with two 1/4-20 X 3/4”

BOLTS Then add 2 SETS OF 1” SADDLES and loosely attach with 1/4-20 x 1-1/2” bolts and

locknuts.

4. Mount the AZ-EL assembly on the top of the PORTABLE FOLDING STAND and tighten the mast

clamp bolts. Now insert the rear of the antenna boom into the saddles to about 3” behind the

reflector, orient the antenna so the rear set of elements are horizontal and tighten the saddle bolts.

GENERAL GUIDELINES

For optimum performance, mount antenna high and in the clear. Always use high quality coax

and connectors. Old, corroded, or poor quality materials can SERIOUSLY affect VSWR, gain, and

pattern. If possible, test the antenna, connectors and feedline BEFORE installation. At 6' in height,

the antenna will exhibit performance approaching the specifications. If it doesn't, check feedline

and connectors for continuity and shorts. Check antenna shorting bars, element placement and

length, against Dimension Sheet.

Rear mounted antennas can generally be mounted in any polarization to any type of mast,

conductive or non-conductive.

M2ANTENNA SYSTEMS, INC.

4402 N. Selland AVE.

FRESNO, CA 93722

(559) 432-8873 FAX: 432-3059

www.m2inc.com Email: [email protected]

393CP18 PARTS LIST

6-29-05

DESCRIPTION QTY

BOOM SECTION #1, 1 X .058 X 54" ............................. 1

BOOM SECTION #2, 1X .058 X 54" SOE TFS* ............. 1

ELEMENT, 3/16” ROD X SEE DIM” SHEET .................. 18

DRIVEN ELEMENT ASSEMBLY, .................................. 2

”T” BLOCK ASSEMBLY ................................................. 1

BALUN CABLE , 1/2 WAVE RG-6U ............................... 2

PHASE LINE, LONG, 3/4 WAVE RG-6U........................ 1

PHASE LING, SHORT, 1/4 WAVE RG-6U..................... 1

ASSEMBLY MANUAL..................................................... 1

IN HARDWARE BAG:

SHORTING BAR, 1/8 AND 3/16 HOLES......................... 4

BUTTON INSULATORS, SPECIAL FOR SET SCREW... 36

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

SET SCREW, 8-32 X 1/4, SS ........................................... 44

LOCKNUT, 8-32 SS.......................................................... 2

SEAL NUTS, 3/8-32 .......................................................... 5

CABLE TIE, NYLON ........................................................ 5

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

*TFS = TO FIT ITSELF

OPTIONAL CIRCULARITY SWITCH PART LIST

DESCRIPTION QTY

DRIVEN ELEMENT / POLARITY SWITCH ASSEMBLY............... 1

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

SEAL NUT, 3/8 X 32, GOLD.......................................................... 3

OPTIONAL AZ-EL MOUNTING SYSTEM

DESCRIPTION QTY

MAST CLAMP HALF......................................................... 2

ELEVATION U BRACKET (TACO SHELL) ...................... 1

COUNTERWEIGHT, 3-1/4” X 1-1/2” 4 LB ........................ 1

PLATE, 3 X 8 X 1/4” ALUM............................................... 1

SADDLE, 1”....................................................................... 4

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

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

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

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

BOLT, 1/4-20 X 3/4 FLATHEAD ....................................... 3

LOCKNUT, 1/4-20, SS...................................................... 5

FLAT WASHER, 1/4”, SS ................................................. 2

LOCK WASHER, 1/4” SPLIT RING , SS .......................... 2

M2ANTENNA SYSTEMS, INC.

4402 N. SELLAND AVE.

FRESNO, CA 93722

(559) 432-8873 FAX: 432-3059

www.m2inc.com Email: [email protected]

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