Emcee TTU500FA Bedienungsanleitung

Broadcast Products

P.O. Box 68, White Haven, PA 18661 Phone: (570) 443-9575 FAX: (570) 443-9257

MDS



MMDS



ITFS



LPTV

North America



South America



Europe



Asia



Australia



Africa

Since 1960

6) USERS MANUAL

TTU500FA

SOLID STATE LDMOS

500W UHF TRANSMITTER

TTU500FA

SOLID STATE LDMOS

500W UHF TRANSMITTER

05/01

IMPORTANT

Transient Overvoltage Protection

Transient overvoltageof micro- andnano-secondsdurationspresentonAC lines

are a continuous threat to all solid-state circuitry. The resulting costs of

equipment repairs and system downtime make preventative protection the best

insurance against thesesuddensurges. Types ofprotection rangefrom isolation

transformers and uninterruptible power supplies to the more cost effective AC

power line protectors. As transientsare most often caused by lightning induction

and switching surges, AC power line protectors are the most practical solution.

An effective AC power line protector is one capable of dissipating impulse

energy at a low enough voltage to ensure the safety of the electronic compo-

nents it is protecting. The protection unit should be across the AC line at all

times even during periodsof total blackout. It should also reset immediately and

automatically to be 100% ready for repeated transients.

TABLE OF CONTENTS

I. THE TTU500FA TRANSMITTER

1.1 Introduction

1.2 Specifications

1.3 Installation

1.4 Operation

1.5 Warrant

and Parts Orderin

II. CIRCUIT DESCRIPTION

2.1 Modulator

2.2 EMEX1 2 Watt UHF Exciter

2.3 500 Watt UHF Power Amplifier

2.4 Output Section

2.5 Control/Meterin

Panel

III. MAINTENANCE

3.1 Periodic Maintenance Schedule

3.2 Recommended Test E

uipment

3.3 Troubleshootin

3.4 Ali

nment

3.5 Output Power Calibration

3.6 Linearit

Corrector Ad

ustment

3.7 Remote Monitor Si

nal Levels

3.8 Spare Modules and Components

3.9 S

nthesizer Pro

rammin

IV. DATA PAK

V. SCHEMATIC DIAGRAMS

SECTION I

THE TTU500FA TRANSMITTER

1.1 INTRODUCTION ....................................................... 1

1.2 SPECIFICATIONS ..................................................... 1

1.3 INSTALLATION ........................................................ 1

1.4 OPERATION ........................................................... 1

1.5 WARRANTY AND PARTS ORDERING ................................... 1

SECTION I

THE TTU500FA TRANSMITTER

1.1 INTRODUCTION:

The EMCEE TTU500FA LPTV Transmitter is a remarkably compact design rated to provide

500 watts peak visual and 25 watts average aural power on any FCC specified channel extending

from 470 to 806MHz. The TTU500FA is completely solid-state supplying maximum performance

and reliability through the liberal utilization of Laterally Diffused Metal Oxide Semiconductors

(LDMOS). Comprised of a modulator, an EMEX1 2 Watt UHF Exciter, one 500 Watt UHF Amplifier

drawer, an Output Section for filtering and power measurement, and panels for power distribution

and metering/control, the TTU500FA is easy to service and maintain with RF alignment practically

nonexistent. A number of controls and indicators, furnished on the transmitter’s Control/Metering

panel and the EMEX1 Exciter front panel, provide convenient operation while displaying the results

of the transmitter's diagnostic circuitry.

The TTU500FA is designed for the express purpose of broadcasting as authorized by the U.S.

Federal Communications CommissionunderPart 74, Subpart G, of the FCC Rulesand Regulations.

1.2 SPECIFICATIONS:

Visual:

Output Power 500 watts peak

Emission 5M75C3F visual

Color Transmission NTSC, PAL, or SECAM

Output Frequency 470-806MHz

(FCC - Ch.14-69)

(CCIR - Ch.21-62)

Frequency Stability Visual Carrier ±500Hz

Output Power Stability ±0.5dB

Spurious Products



60dB below peak sync

Harmonics



60dB below peak sync

In-band Intermodulation (IM3)



52dB below peak sync

Differential Gain ±5%

Differential Phase ±3

(

Low Frequency Linearity 5%

Frequency Response ±0.5dB

Sideband Response Better than FCC 73.687(a)(1)

Envelope Delay Better than FCC 73.687(a)(3)

Output Impedance/Connector 50 ohms / 7/8" EIA flange

Video Signal to Noise



55dB

Video Input Level 1 volt peak-to-peak nominal

Video Input Impedance 75 ohms unbalanced

Aural:

Output Power 25 watts average

Emissions 250KF3E

Frequency Stability ±200Hz re. visual

Audio Input Level 0dBm nominal

Audio Input Impedance 600 ohms balanced

Audio Distortion <1%

FM Noise <



55dB

General/Mechanical:

Ambient Temperature



(

C to +50

(

Power Requirements 230Vac ± 15%, 1 phase, 50/60Hz, 4kW

Power Consumption: 2kW w/black picture

Power Factor 0.9

Mechanical Dimensions 48"H x 22"W x 31"D

Weight 300 lb.

1.3 INSTALLATION:

Except where otherwise noted, the connectors mentioned in the following instructions are located

on the rear of the transmitter.

1. After unpacking the transmitter, a thorough inspection should be conducted to reveal any

damage which may have occurred during shipment. If damage is found, immediately notify

the shipping agency and advise EMCEE Broadcast Products Customer Service or its field

representative. Also check to see that any connectors, cablesor miscellaneous equipment,

which may have been ordered separately, are included.

2. Place the transmitter in a clean, weatherproof environment providing adequate ventilation

for the exhaust fans at the rear of the transmitter drawers. It is important to maintain the

transmitter's ambient temperature within the



(

C and +50

(

C limits. Cooler ambient

temperatures will provide increased reliability.

3. Place the transmitter in its permanent location near a single-phase receptacle that supplies

230Vac at 50/60Hz. The ac source should have a minimum power capacity of 4kW.

IMPORTANT

Do not apply ac power to the transmitter at this time since its RF output must be

properly loaded before being placed in operation.

4. Set all circuit breakers, including the customer's incoming ac line breaker, to the OFF

position. Ac breakers can be found on the transmitter’s AC Distribution Panel, at the rear of

the amplifier and Exciter drawers, and on the front AC Power panel. Place an appropriate

power line protector (surge suppressor) across the ac line that supplies the transmitter.

5. Connectthebasebandvideoandaudiocables(customersupplied)tothetransmitter's VIDEO

and AUDIO connectors located on the upper panel at the rear of the transmitter cabinet.

6. Connect the transmitting antenna cable (or a 1kW, 50 ohm dummy load) to the 7/8" EIA

flange connector marked RF OUTPUT located through the center rear of the cabinet’s top

cover.

7. Verify that the power cords of the Modulator (110V/15A), Exciter (110/15A) and 500W Power

Amplifier drawer (220V/20A)are plugged into the receptacles at the bottom of the transmitter

cabinet. Also check to see that any ancillary equipment included in the cabinet (i.e. Video

Detect Switch, Stereo Generator, etc.) are connected to the appropriate ac sockets.

8. Check to see that all RF cables and wire harnesses are properly connected and secure.

9. Usingthe4-prong, twist-lock, femaleplugsuppliedwiththetransmitter,fabricateanac power

cord (Figure 1

1) and plug it into the transmitter's AC MAINS connector at the bottom rear

of the transmitter cabinet. Open the incoming ac mains wall breaker and connect the other

end of the power cord into an appropriate 220Vac electrical outlet.

1.4 OPERATION:

Assuming the installation instructions of Section 1.3 have been completed and the transmitter is

receivingbasebandvideo and audiosignals, proceed with the following steps to place the transmitter

in operation. Except where otherwise noted, the controls, switches, and indicators mentioned in

these steps are located on the front of the transmitter.

1. Open the AC POWER circuit breaker located on the bottom front panel of the transmitter and

close the incoming ac mains breaker. Insure that the EMEX1 Exciter OPERATE/STANDBY

switch is in the off/out (STNDBY) position and the AGC/MANUAL button is in the off/out

(MANUAL) position. Place the transmitter’sControl/Metering panel FWD/REFL meter switch

to the FWD/out position.

2. Place the three AC Distribution Panel breakers (CB2, CB3, CB4), located at the lower rear

of the cabinet, to the on position. Also switch the Exciter and amplifier drawer rear panel

breakers to on.

3. Move the AC POWER circuit breaker located on the bottom front panel of the transmitter to

the ON position.

4. If applicable, place the Modulator's power switch to ON and verify that it is providing 87.5%

video modulation. If necessary, adjust the Modulator for the proper video depth of

modulation asdescribed in its instruction manual. Also check to see that the audio peaks are

not overmodulating the aural carrier.

5. Verify the following transmitter responses:

a. The fans at the rear of each drawer should be operating.

b. The Exciter’s green LED indicators should react as follows:

SYNTHESIZER LOCK – on

IF STATUS – on

AMPLIFIER STATUS – on

LINEARITY CORRECTOR – on

AGC ACTIVE – off

SWEEP MODE – off

OPERATE/STANDBY – off

VSWR RESET – off

AGC voltmeter – 1 segment lit at approximate center

RF POWER meter – 0%

c. The green LED indicators on the transmitter’s Control/Metering panel should respond

as follows:

AMPLIFIER TEMP – off

AMPLIFIER – on

POWER SUPPLY – off

RF POWER meter – 0%

FWD – on

REFL – off

6. Turn the Exciter's OUTPUT LEVEL ADJUST two or three turns counterclockwise and press

the OPERATE/STANDBY switch in to place the transmitter in OPERATE. Then verify the

following responses of the transmitter:

a. The Exciter’s OPERATE/STANDBY switch indicator is now lit green.

b. The POWER SUPPLY Control/Metering panel indicator is now lit green.

c. The status of all other indicators previously mentioned is the same.

7. Check to see that the Control/Metering panel’s meter switch is in the FWD/out position and

then slowly turn the Exciter’s OUTPUT LEVEL ADJUST clockwise until a 100% indication

appears on the Control/Metering panel’s RF POWER meter. The Exciter’s RF POWER

meter should also be displaying a 100% indication.

8. After 10 minutes of operation press the Exciter’s AGC/MANUAL switch in to engage the

transmitter’s output automatic gain control. If necessary and with a small tuning tool, slowly

turn the AGC LEVEL ADJUST to bring the transmitter’s RF POWER meter reading back to

100%.

9. Place the Control/Metering panel's meter switch to REFLD and verify that the RF POWER

meter indicates no more than 10% returned power. If the reflected power is more than 10%,

shutdownthe transmitter andcheck theVSWR of thetransmittingantenna anditsassociated

cable.

10. Place the Control/Metering panel's meter switch to FWD for constant monitoring of the

transmitter's final output power.

The transmitter is now in operation. Check its coverage area for clean, sharp television reception.

If the reception or picture quality is unsatisfactory, examine the amount of power delivered to the

transmitting antenna (see Section 3.5) and, if necessary, examine the antenna orientation and

antenna transmission line VSWR to insure maximum radiation in the proper direction.

1.5 WARRANTY AND PARTS ORDERING:

Warranty – EMCEE warrants its equipment to be free from defectsin material and workmanship for

a period of one year after delivery to the customer. Equipment orcomponents returned as defective

(prepaid) will be, at our option, repaired or replaced at no charge as long as the equipment or

component part in question has not been improperly used or damaged by external causes

(e.g., water, ac line transients or lightning). Semiconductors are excepted from this warranty and

shall be warranted for a period of not more than ninety (90)daysfrom date of shipment. Equipment

or component parts sold or used by EMCEE, but manufactured by others, shall carry the same

warranty as extended to EMCEE by the original manufacturer.

Equipment Returns – If the customer desires to return a unit, drawer, or module to EMCEE for

repair, follow the procedure described below:

1. Contact EMCEE Customer Service Department by phone or fax for a Return Authorization

Number.

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