Ptek FM Series Manuale utente

HANDBOOK

BROADCAST FM EXCITERS

FM SERIES

PTEK

Limited Warranty

PTEK (SELLER) warrants that products are free from defects in material and workmanship and meet

erformance specifications provided, however, that:

(A) SELLER’ liability under this Warranty is limited to repairing or replacing, at its option, any

product delivered here under not conforming to this Warranty;

(B) This Warranty is limited to a period of two years;

Warranty; and

(D) SELLER shall be liable under this Warranty only if:

(1) It is promptly notified in writing by the Buyer upon discovery of the failure of any product to

conform to this Warranty,

(2) The product is returned to SELLER, transportation charges prepaid by the Buyer,

(3) The product is received by SELLER not later than ten days after the last day of the one-year

period of this Warranty, and

(4) SELLER’ examination of the Product discloses to SELLER’S reasonable satisfaction that

such defects or failures as may exist have not been caused by misuse, neglect, improper

installation, repair, alteration, accident or shipping.

The Buyer will prepay freight to and from SELLER on products serviced here under at SELLER’ plant; but

SELLER may, at its option, elect to perform any repairs here under at the Buyer’s place of business.

The foregoing constitutes SELLER’S entire Warranty expressed, implied and/or statutory, except as to

title, and states the full extent of SELLER’S liability to the Buyer or to any other party for any breach of

such Warranty and for damages, whether direct, special, incidental or consequential; and, other than as

expressly provided in this document. No Warranties, expressed or implied, including any Warranty or

merchant ability or of fitness for a particular purpose, are made. No employee, representative or agent of

SELLER has any authority, expressed or implied, to alter or to supplement the terms of this Warranty.

Warranty Service

The Limited Warranty covers parts and labor to the original purchaser for one year. Damage

caused by misuse or shipping is excluded from the warranty. Before returning units or material,

contact the factory for a Returned Material Authorization (RMA) number. Ship all materia

prepaid. Defective material should be addressed to:

PTEK

Customer Service Manager

1814 Schooldale Drive

San Jose, CA. 95124

(408) 448-3342

Page 3

Contents

Safety Notice .................................................................................................................4

Rear

FCC, Accessory Connections & efficiency V O/P Pwr.................................................12

Schematic Chassis FM150E...................................................................................16-17

Schematic Power Module FM150E..............................................................................20

Schematic Power Module Control FM150E.................................................................21

Parts list Chassis...........................................................................................................22

Parts list PA Boards......................................................................................................23

Parts list Synth Board ..................................................................................................25

Parts list LED Board ....................................................................................................25

Specifications ................................................................................................................5

Front & Panel Layout .............................................................................................6

Installation .....................................................................................................................8

Schematic Synthesizer ...........................................................................................12-13

Schematic Chassis ..................................................................................................16-17

Schematic Power Module ......................................................................................18-19

PROVISIONAL......................11/25/96

REV A.....................................1/16/97

REV B.....................................10/7/97

REV C.....................................4/13/99

REV D.....................................5/24/99

Rev record

Safety

BEFORE APPLYING POWER

GROUND THE EXCITOR.

Fuses

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

DO NOT REMOVE THE EXCITOR COVER

Output connector

Verify that the line voltage is 115V

To minimize shock hazard, the excitor chassis must be connected to an electrical ground. the excitor must be

connected to the ac power mains through a three-conductor power cable, with the third wire firmly connected to an

electrical ground (safety ground) at the power outlet. Any interruption of the protective (grounding) conductor or

disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury.

If the excitor is to be energized by any other source be certain the that chassis is connected to a separate safety

ground.

Only fuses with the same required current, voltage rating, and specified type (normal blow, time delay, etc.) should be

used. Do not use repaired fuses or short-circuited fuseholders. To do so could cause a shock or fire hazard

Do not operate the power amplifier in the presence of flammable gases or fumes.

Operating personnel must not remove the exciter cover. Component replacement and internal adjustments must be

made only by qualified service personnel.

The type N output connector carries dangerously high RF voltages which present a shock and burn hazard.

operate this excitor with out the out put connector properly terminated in either an adequately rated load or antenna.

NEVER

Page 4

Specifications

MONAURAL

Audio Input Impedance:

Audio Input Level:

Audio Frequency Response:

Total Harmonic Distortion:

FM S/N Ratio (FM Noise):

Asynchronous AM S/N Ratio (AM Noise):

Synchronous AM SIN Ratio (Incidental AM Noise):

600 ohms, balanced

+10 dBm (6.93 volts peak-to-peak) at 600 ohms for

75 kHz deviation

+/-0.5 dB; flat or 75 microsecond pre-emphasis, 20

Hz to 15kHz (other time const. available)

0.15% max.; 20 Hz to 15 kHz

70 dB min. below 75 kHz deviation at 400 Hz,

measured within a 20 Hz to 15 kHz bandwidth with

75 microsecond de-emphasis

60 dB RMS. below carrier; reference: 100% AM

modulation, at 400 Hz with 75 microsecond de-

emphasis, no FM modulation

57 dB below carrier; reference: 100% AM

modulation, full power at 400 Hz with 75uS de-

emphasis, FM +/- 75 kHz, 400Hz

ENVIRONMENT

Altitude: Ambient Temperature

0-10,000 ft -10 to +50 oC

WIDEBAND

Inputs:

Input Level:

Wideband Amplitude Response:

Composite Unbalanced 75 Ohms

SCA 1 Unbalanced 75 Ohms

3.5 V RMS. (10 Volts peak-to-peak) for 75 kHz deviation

+/-0.5 dB, 20 Hz to 100 kHz

GENERAL

Rated Power Output:

Power Consumption:

Frequency Range:

Frequency Control:

Frequency Stability:

Output Impedance:

Output Connector:

VSWR:

Modulation Type:

Modulation Capability:

Multi-Meter Indication:

Harmonic Attenuation:

10W, 25W, 50W, 150W, 300W

750 W (for 300W model)

87.7 to 108 MHz, in 200 kHz steps (other step

size to order)

Phase locked loop frequency synthesis from high

stability master oscillator

+/- 1.2 kHz

50 ohms

Type -"N" female

1.5:1 for full power, derate to 0 at inf.

Direct carrier frequency modulation

Internally limited to 100 kHz deviation

Deviation, Forward Power, Reverse Power, Final

I&V

-70 dB, min.

Page 5

Rear panel layout

876

Page 6

Front panel layout

. DEVIATION

REMOTE

PWR PWR

VOLTAGE

FWD REV

OFF CURRENT

FINAL MONO IN

600 OHMS

AC IN

GAIN

COMPOSITE

GAINGAIN

SCA

FUSE

RF OUTPUT

FINAL CURRENT

FINAL VOLTAGEFORWARD POWER

REVERSE POWER

ADJ

POWER

OFF

OPERATE

REMOTE OFF

FAULT

DRIVE LOW

FM Series

PTEK

FM10E

DEVIATION

OUTPUT POWER W (REV X0.1)

4.0

3.0

2.0

1.0

0AMPS

PTEK

VOLTS

DEVIATION kHz

100

Key Element Description

1AC IN & FUSE 110 VAC input and Fuse 10A

2COMPOSITE Unbalanced wide band composite input

3SCA Unbalanced wide band input

4RF OUT TYPE N RF Output

5GAIN ADJUSTMENT Composite & wide band level adjustment

6Accessory connector Connections for; Remote off and DC indications of Forward Power, Reverse

Power, Final Voltage, Final Current and Deviation.

7FCC ID Type approval number

8SERIAL NUMBER Serial number for reference purposes

Page 7

Key Element Description

1METER Indicates Forward Power, Reverse Power, Final Voltage, Final Current and

Deviation

2OPERATE Switch and

Indicator

This switch sets the FM Broadcast Amplifier to the Operate Mode; 110 VAC is

applied to the line transformers and this amber indicator is lit.

3REMOTE OFF Indicator This red LED indicator is lit when the FM Broadcast Amplifier remote off

terminals (rear panel) are open circuit.

3DRIVE LOW Indicator This red LED indicator is lit when the FM Broadcast Amplifier can not make the

power requested, because for example low drive power.

5FAULT Indicator This red LED indicator is lit when the FM Broadcast Amplifier is in a fault

condition. This can be for one or combination of the following:-

Over drive, High supply Voltage, High load VSWR, Over temperature.

6 Meter Select Switch This switch selects one of the following to be presented on the meter (1):-

Forward Power, Reverse Power, Final Voltage, Final Current and Deviation.

7ADJ POWER control This control adjust the output power from rated full power to less than 50%.

8 Ventilation Filter This provides for filtering the environmental air as it is drawn into the cabinet by

the internal fan (not used on FM10E).

Refer to the Table below for the following description. The installer should assure the ac line voltage is turned OFF

before performing this procedure. The electrical connections are installed at the Exciter rear panel.

Installation-Electrical

Step Procedure

1 Connect the load RF line to RF OUT connector.

3 Connecttheaclinepowertotheaclineinconnector.

4 Optional. Connect the remote site metering, to the rear terminal block.

5 Connect either the composite input to the output from a stereo encoder or the balanced mono input to a

program source

Page 8

AC IN

SCACOMPOSITE

GAINGAIN

600 OHMS

REV

PWRPWR

FWD

CURRENTVOLTAGE

FINAL MONO IN

REMOTE

ON OFF

GAIN

RF OUTPUT

RG8 TO ANTENNA/PA

PART OF USER SUPPLIED REMOTE CONTROL

BALANCED MONO IN

OR (NOT BOTH)

FROM STEREO ENCODER OR STL

Refer to the Table below for the following procedure.

Component Layout Synthesizer Module

Step Action Verification

1 Switch the RF out to a dummy load.

2 Turn on the ac line power to excitor. DRIVE LOW indicator is out. FAULT indicator is on

initially then out after 30 seconds. REMOTE OFF

indicator is out.

3 Select Meter to read FORWARD POWER.

4 Adjust the ADJ POWER CONTROL to the

rated power.

5 Select Meter to read FINAL VOLTAGE. The Meter reads 15~50V. Note the exact value.

6 Select Meter to read FINAL CURRENT. The The Meter reads 1~8A. Note the exact value.

7 Calculate the dc power input to the PA from the

values of step 4 and 5.

P=VI and note the exact value.

8 Select the Meter to read REVERSE POWER. Check that there is no appreciable reading of reverse

power

9 Calculate the PA efficiency. Step 6 value divided by the value in step 7 or about 50

percent.

10 Adjust the ADJ POWER Knob to set the output

to the required output power.

Turn-On Checkout

Page 9

SET FREQUENCY

WITH THIS BANK OF SWITCHES SET MONO LEVEL

FREQUENCY DIP SWITCH FREQUENCY DIP SWITCH

MHz SETTING MHz SETTING

12345678 12345678

87.7 00000000 97.9 00110011

87.9 00000001 98.1 00110100

88.1 00000010 98.3 00110101

88.3 00000011 98.5 00110110

88.5 00000100 98.7 00110111

88.7 00000101 98.9 00111000

88.9 00000110 99.1 00111001

89.1 00000111 99.3 00111010

89.3 00001000 99.5 00111011

89.5 00001001 99.7 00111100 ON="0"

89.7 00001010 99.9 00111101

89.9 00001011 100.1 0 0 1 11110

90.1 00001100 100.3 0 0 1 11111

90.3 00001101 100.5 0 1 0 00000

90.5 00001110 100.7 0 1 0 00001

90.7 00001111 100.9 0 1 0 00010

90.9 00010000 101.1 0 1 0 00011

91.1 00010001 101.3 0 1 0 00100

91.3 00010010 101.5 0 1 0 00101

91.5 00010011 101.7 0 1 0 00110

91.7 00010100 101.9 0 1 0 00111

91.9 00010101 102.1 0 1 0 01000

92.1 00010110 102.3 0 1 0 01001

92.3 00010111 102.5 0 1 0 01010

92.5 00011000 102.7 0 1 0 01011

92.7 00011001 102.9 0 1 0 01100

92.9 00011010 103.1 0 1 0 01101

93.1 00011011 103.3 0 1 0 01110

93.3 00011100 103.5 0 1 0 01111

93.5 00011101 103.7 0 1 0 10000

93.7 00011110 103.9 0 1 0 10001

93.9 00011111 104.1 0 1 0 10010

94.1 00100000 104.3 0 1 0 10011

94.3 00100001 104.5 0 1 0 10100

94.5 00100010 104.7 0 1 0 10101

94.7 00100011 104.9 0 1 0 10110

94.9 00100100 105.1 0 1 0 10111

95.1 00100101 105.3 0 1 0 11000

95.3 00100110 105.5 0 1 0 11001

95.5 00100111 105.7 0 1 0 11010

95.7 00101000 105.9 0 1 0 11011

95.9 00101001 106.1 0 1 0 11100

96.1 00101010 106.3 0 1 0 11101

96.3 00101011 106.5 0 1 0 11110

96.5 00101100 106.7 0 1 0 11111

96.7 00101101 106.9 0 1 1 00000

96.9 00101110 107.1 0 1 1 00001

97.1 00101111 107.3 0 1 1 00010

97.3 00110000 107.5 0 1 1 00011

97.5 00110001 107.7 0 1 1 00100

97.7 00110010 107.9 0 1 1 00101

Page 10

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