Blonder tongue CMA-b Manual de usuario

Description

The CMA-b is a low noise, single channel VHF preamplifier with excellent gain and the ability to accept a wide

range of input signal levels, making it ideal for CATV and MATV headend installations. The CMA-b mounts on

the antenna mast and power is duplexed on the downlead, eliminating a separate power supply lead.

Features

• Very Low Noise Figure

• Excellent Gain, Flat Response

• Excellent Adjacent Channel Overload Rejection

• Output Monitor Jack Permits Testing Without Service Interruption

651094300M

INSTRUCTION MANUAL

One Jake Brown Road

Old Bridge, NJ 08857-1000 USA

(800) 523-6049 • (732) 679-4000 • FAX: (732) 679-4353

www.blondertongue.com

CMA-b

Low Noise, Single Channel Preamplifier

Stock No. 4706

Gain

CMA-b ch. 2 - 6: 29 dB, 26 dB min

CMA-b ch. 7 - 13: 26 dB, 25 dB min

CMA-b FM: 24 dB, 20 dB min

Bandpass Flatness

Channels 2 - 13: 6 MHz +/- 0.25 dB

FM: 1 dB, 2 dB max.

Noise Figure

CMA-b ch. 2 - 6: Less than 3.5 dB

CMA-b ch. 7 - 13: Less than 2.5 dB

CMA-b FM: 2 dB, 3 dB max.

Input Impedance: 75 ohms

Selectivity: 12 dB down 9 MHz

from center freq.,

10 dB min.

Minimum Recommended

Input for TASO Grade 1 (Excellent

Picture)

CMA-b 2 - 6 & 7 - 13: 300 µv (-10 dBmv)

Maximum Input for Just-Perceptible Cross

Modulation

CMA-b ch. 2 - 6: 36 dBmv

CMA-b ch. 7 - 13: 28 dBmv

Maximum Input for Just-Perceptible

Intermodulation

CMA-b ch. 2 - 6: 33 dBmv

CMA-b ch. 7 - 13: 26 dBmv

Operating Ambient

Temperature Range: -40˚ F to 140˚ F

Output Monitor Jack: -20 dB (Backmatched)

Power Requirement: -21 VDC at 40 ma

Connectors (75 ohms)

Input: Type F, Output, Type F, Output Monitor: Type F

Housing: Cast Aluminum

Dimensions: 5" x 3-7/8" x 2-5/16"

Shipping Weight: 1 lb., 5 oz.

Specifications (Typical)

One Jake Brown Road

Old Bridge, NJ 08857-1000 USA

(800) 523-6049 • (732) 679-4000 • FAX: (732) 679-4353

www.blondertongue.com

Installation

For best signal-to-noise ratio, the CMA-Uc should be mounted close to the antenna (See Figure 1).

Figure 1

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

Returning Product for Repair (or Credit)

A Return Material Authorization (RMA) Number is required on all products returned to Blonder

Tongue, regardless if the product is being returned for repair or credit. Before returning product, please

contact the Blonder Tongue Service Department at 1-800-523-6049, Ext. 4256 or visit our website: www.

blondertongue.com for further information.

WARNING: TO PREVENT SHOCK HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE

NOTE TO CATV INSTALLERS

This reminder is provided to call the CATV System Installer’s attention to Article 820-40 of the NEC that pro-

vides guidelines for proper grounding and, in particular, specifies that the cable ground shall be connected to

the grounding system of the building, as close to the point of cable entry as practical.

TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER

FROM THIS UNIT. NO USER-SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL

The lightning flash with arrow-

head symbol within an equilat-

eral triangle is intended to alert

you to the presence of unin-

sulated “dangerous voltage”

within the product’s enclosure

that may be of sufficient mag-

nitude to constitute a risk of

electrical shock to persons.

The exclamation point

within an equilateral triangle

is intended to alert you to

the presence of important

operating and maintenance

(servicing) instructions in the

literature accompanying the

product.

Under no circumstances should the unit be

mounted in an unventilated area or other location

where the ambient temperature may exceed the

rated maximum given in the specifications.

Figure 1 shows the method of attaching the CMA-b to the antenna mast

All hardware required to mount the CMA-b is supplied with the unit.

Note: -21 VDC must be supplied to the CMA-b from the output

cable. Blonder Tongue's model 1526 Power Supply is designed

specifically for this purpose.

The performance of the CMA-b can be checked at the -20 dB test

jack without interrupting service. A standard 75-ohm "F" connector

is used.

CMA-b - Instruction Manual

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