M2 Antenna Systems 678-14 Manual de usuario

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

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

Model .........................................678-14 (CH48-14)

Frequency Range.......................674-682 MHz

Usable Frequency Range ..........650-684 MHz

*Gain ..........................................16.8 dBi

Front to back ..............................25 dB Typical

Feed type ...................................Folded Dipole

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

Maximum VSWR........................1.2:1 Typical

Polarity .......................................Vertically / Horizontally

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

Power Handling ..........................500 Watts

Boom Length / Dia......................80” / 1” - 3/4”

Stacking Distance.......................E=42” / H=41”

Mounting.....................................1-1/4” to 2” Nom.

Wind area / Survival ...................0.5 Sq. Ft. / 100 MPH

Weight / Ship Wt.........................4 Lbs. / 6 Lbs.

M2 Antenna Systems, Inc.

Model No: 678-14 (TV CHANNEL 48-14)

FEATURES:

The 678-14 (CH48-14) is designed for deep fringe UHF TV reception where smaller Yagi’s and wide band compromise

antennas just don’t cut it. The antenna enables the “Polarity Flexibility” in any given application. Low cost yet

manufactured for dependability, the 678-14 (CH48-14), the folded dipole, provides a virtual flat match for over 10+ MHz.

The gain has been designed to roll-off quickly above range limits to prevent receiver overload from high power adjacent

channel interference. The heavy duty two piece boom and 3/16” elements, provide superior performance and longevity.

The 678-14 (CH48-14) is a DC grounded antenna designed to help protect receiver front ends from lightning and static.

Specialized single and multiple channel antennas are available for all TV and FM bands.

SPECIFICATIONS:

*Subtract 2.14 from dBi for dBd

678-14 (CH48-14) DIMENSION SHEET

REAR

CHAN-48 -14

(HI-PERFORMANCE 674-680 MHZ YAGI)

DIMENSION SHEET

FRONT

43.875

DECIMAL TO

FRACTION

CONVERSION

.062 = 1/16

.125 = 1/8

.188 = 3/16

.250 = 1/4

.313 = 5/16

.375 = 3/8

.437 = 7/16

.500 = 1/2

.562 = 9/16

.625 = 5/8

.688 = 11/16

.750 = 3/4

.813 = 13/16

.875 = 7/8

.937 = 15/16

66.500

73.688

80.000

51.250

59.313

22.874

29.625

16.062

36.937

5.875

3.250

10.437

0.000

ELEMENT

SPACING

7.188

7.125

7.000

CH48-14D

M. STAAL

10-12-05

FOLDED DIPOLE DRIVEN ELEMENT

7.188

7.125

7.062

7.750

7.437

7.313

ELEMENT

LENGTH

8.375

678-14 (CH48-14) ASSEMBLY MANUAL

GETTING STARTED

Tools handy for assembly process: Phillips head screwdriver, 11/32” nut driver or socket, 7/16” end wrench or socket.

Start by checking the parts needed to complete the assembly. You should have the following parts below:

1. CHAN48-14 Boom Assembly

2. Folded Dipole Assembly

3. Hardware bag and Uni-cradle Assembly

4. Element Assembly

1 2 3

Step 1:

Assembly the boom sections using

8-32 x 1-1/4 screws and locknuts.

Step 2:

Attach the folded dipole to the boom

using 8-32 x 1-1/4 screw and locknut.

(small hole)

Step 3:

Assembly the Uni-cradle and U-bolt to the boom with 1/4-20 nuts and

washers. Please note that you have the correct holes for your polari-

zation (vertical or horizontal) Attach boom assembly to tripod or

mast for ease of further assembly. NOTE: The U-bolt and nuts are

stainless steel and can seize. We suggest using WD40 or some

other lubricant when assembling.

Step 5:

Starting at the “Reflector” or rear of the

Boom (next to mast mount), install a

button insulator on each side of the

boom.

Step 4:

Unroll the element assembly and position the green line as your starting

point . Please note that the elements have already been center for you at

the factory using 3/16” retainer clip. The reflector will be the first element to

the right of the green line.

678-14 (CH48-14) PARTS LIST

Step 7:

Now move to the other side of the antenna. While

holding one side of the element, push a retainer clip

onto the other side of the element until it bottoms out

on the button insulator. Continue this procedure until

all elements are locked into place.

Step 6:

Starting at the rear of the antenna, hold the boom in

one hand and insert the first element into the boom.

Continue inserting first the button insulator and then

the next element in series until finished.

678-14 (CH48-14) PARTS LIST

10-12-05

DESCRIPTION ............................................................................QTY

BOOM, 1.0” X .058 X 36.00 SOE TO FIT 3/4”, ALUM .................. 1

BOOM, 3/4” X .049 X 37.75 ALUM................................................ 1

ELEMENTS, 3/16” X SEE DIM. SHEET........................................ 13

DRIVEN ELEMENT FOLDED DIPOLE ASSEMBLY..................... 1

BOOM TO MAST PLATE, 3 X 4 X 3/16” ....................................... 1

U-BOLT, 2”, .................................................................................. 2

U-BOLT, 1” , SS............................................................................. 2

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

IN HARDWARE BAGS:

NUT, 5/16-18, SS .......................................................................... 4

LOCKWASHER, 5/16” SPLIT RING SS ....................................... 4

NUT, 1/4-20, SS ............................................................................ 4

LOCKWASHER, 1/4” SPLIT RING, SS......................................... 4

SCREW, 8-32 X 1-1/4”, SS ........................................................... 3

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

SHAFT RETAINER (KEEPERS), 3/16” SS ................................... 26

BUTTON INSULATOR, POLY....................................................... 26

PUSH TUBE, 3/8” X 3” USED TO INSTALL KEEPERS .............. 1

M2ANTENNA SYSTEMS, INC.

4402 N. SELLAND AVE.

FRESNO, CA 93722

(559) 432-8873 FAX: 432-3059

www.m2inc.com Email: [email protected]

THIS COMPLETES THE ASSEMBLY OF THE 678-14 (CH48-14)

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