Lpb Am-30p series User manual

AM-30P Series

AM

Transmitter

Manual

Model: AM-30P

LPB COMMUNICATIONS, INC.

311

Spruce Street

Camden,

NJ

08103-1929

856 365-8585

PH

856 365-8999 FX

www.lpbinc.com

From the library of WØMTU

CAR.R[ER

CURRENT

2.nd

RA.DlATr~G

Cp.8LE

SYSTEMS

TABLE

OF

CONTENTS

Section Description page

1.0 INTRODUCTION

2.0 WARP-ANTY AND SERVICE 1

71

Limited Warranty

2.2 Service

3.0 APPLICABLE FCC RULES 2

40

CIRCUIT DESCRIPTION 2

4.1

Summary

4.2 Power Supply

4.3 Exciter

4.3.1 Audio

4.3.2 Oscillator

4.3.3 RF Pre-Driver and Driver Stages

4.4 RF Power Amplifier

4.5 Audio Limiter (-L Option)

5.0 INSTALLATION 5

5.1

Location and Mounting

5.2 Interfacing the Transmitter

6.0 CONTROL SETTINGS AND OPERATION 5

6.1

User Control Description and Location

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7

INSTRUCTION

MANUAL

LPB

l\10DEL Al\1-30P TRANSl\1ITTER

CARRIER CURRENT and RADIATING

CABLE

SYSTEMS

Revised

MAY

2006

1.0

INTRODUCTION

Low

Power

AM Transmitters are the product

of

LPB'

s nationally recognized broadcast experience since

1960- This P version solid state transmitters utilizes state-of-the-art technology and has been Type

Approved for licensed use under Part

73

of

the

FCC

Rules

and Regulations.

The

transmitter

power

output

(TPO)

is

adjustable

down

to about 2 watts. This freedom allows greater flexibility

of

system design,

2.0

Warranty

and

Service

Information

2.1

Limited

Warranty

We

guarantee that you will find the appearance, \vorkmanship and standards

of

material and construction

of

this equipment in keeping with the application and ,vith good standards

of

commercial practice.

For

a period

of

one year from date

of

delivery.

we

guarantee this equipment against any form

of

failure

provided that, m the opinion

of

the manufacturer, no

improper

use

of

or modification to this equipment

is

at

fault. The guarantee also requires tbat the equipment IS properly instalied and operated within stated

parameters During this period, LPB will fumish materials and labor in

our

shops to

coneet

any failure.

Shippll1g charges are the responsibdity

of

the customer, After walTanty explrati0l1. service will continue

to

be available from LPB.

Pagei

From the library of WØMTU

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1Il~'oL~rl3~10:1

Is

found

011

rile

]denlitlc2~jon

13~ej

,~r;

L~le

T;-ans;"11i7~e:'

This

equipment,

in

general

IS ?\OT

CSER

SERVICEABLE.

If

a

m~.lfuDction

arises

or

is

suspected,

\ve

urge

~ou

to r-eturn

the

equipment

to

the

factor~'

for

proper

repair.

If

the

need

for

service

arises

contact

LPB's

Customer

Service

Department

for

a

Material

Retum

Authorization

(l\:IRA)

and

shipping

instructions

before

shipment.

The

l\1R--'\.

number

must

appear

OIl

the

shipping

label.

LPB

Communications,

Inc.

Phone

856-365-8585 Fax

856-365-8999

3.0

APPLICABLE

FCC

RULES

-\\1ARNING!!!!

In

paragraph

10

of

Report

and

Order

in

the matter

ofMM

Docket 85-125 adopted December 20, 1985,

the commission amended Pari 73.58 to read as follows:

"

However,

auxiliary transmitters \vith nominal

power

ratings

of

100 watts

or

less

are

not required to

be

equipped

with instruments to determine

power

by

the indirect

method

provided that the licensee can

determine

t11e

antenna input

power

at all times."

The

Relative

Power

Output meter in the LPB

AM-30P

transmitter

does

not satisfy this

metering

requirement.

We

suggest the licensee

employ

an

Antenna Current Meter,

such

as

the

Simpson

model

37 (

3

Y2

)RF Ammeter. When looking into a 50 ohm load, the 30-watt transmitter needs a

0-1/\

full-scale

ammeter.

It should

be

noted that the

Commission

does not require the RF

ammeter

meter

to be m the circuit

a1

alJ

times, however, you must have and

use

this capability to

measure

the output.

3.1 ADVISING

THE

FCC

When

installing a

transmitter

for use with low

power

authorization, the user must

advise

the

Commission,

in writing

of

this action.

The

make and

model

number

of

the transmitter

must

be

submitted.

4.0

CIRCUIT

DESCRIPTION

We

do not recommend user repair

of

this equipment

but

furnish the following theory

of

operation

information for those interested. It will assist in isolating a problem. Furthennore, refer to the

troubleshooting

guide in Section 7.0

and

to the block

diagrams

and schematics in this manual,

4.1

Summary

(REFER

TO

TRANSMITTER

BLOCK

DIAGRAM,

FIG. lJ

The

transmitter uses an integrated circuit technique to generate a high-stability signal at six times

the

carrier frequency. A digital countdov,'n circuit produces the carrier frequency. which is tben

amplitude

modulated

at

a low level. A

linear

RF

power

amplifier increases the output to full rated TPO.

The

linear

RF

amplifier

allows output

power

adjustment down to about 10%

of

rated

TPO.

The internal

meter

is

used to

measure

Modulation and

Relative

RF

Power

Output.

Page

2

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4.3

Exciter

(Refer to Exciter Fig. 3 and

sC~1emaiic)

(PariS

Lis, =60

lC-FJ

4.3.1 .-\udio

The

audio section utilizes mput

transfonner

T2 to provide isolation and

balanced

600

OlUl1

line

Input

The

transfonner

secondary

drives operational amplifier A 1

in

the inverting

mode

This feeds an integrated

circuit balanced

modulator

A4

and the input

of

the

meIer amplifier A6.

The

meter

is calibrated to indicate

o

VU

at 100%

modulation

with a tone input

[]

kHz

standard) connected to the transmitter

audio

input.

Balanced

modulation

A4 provides a low level amplitude modulated signal. This output is

square

wave,

rich in harmonics.

DC

voltage for the audio input stage, meter amplifier and

modulator

is

provided from a

sub-regulated

power

supply for high stability.

4.3.2

Oscillator

A

precision

crystal is used in the integrated circuit oscillator A2.

It

operates

at six times

(he

lransmitter

carrier

frequency for

maximum

stability. The oscillator output drives- a divide-by-six

counter

A3, This

output

is

square

wave

at

the

carrier

frequency

and

is applied

10

the

modulator

A4.

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R55

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EXCITER

BOARD

SCHEMATIC

2,

REFER

TO

PARTS

LIST

# 6010

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AM-30P/60P/100P

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EXCITER

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4.4

RF

Power

Amplifier

(Refer to RF

Amplifier

Fig. 4 and schematic) (Parts LIs; S 600.5-A]

Tbe fimJ pO\l\er

amplifier

utilizes a

matched

pair

of

baianc:d

en~itter

transisto,'s Q5 and Q6. Bias must

tJe

supplied for linear

/v\1

amplification. This operating bias is de\'eloped

111

a

senes

regulated bias supply

whose main

conlponents

are A5 and Q4, Because

,be

po"

er

3iTlpiifier

is

push-pull and the transistors are

matched, a high

degree

of

second harmonic rejection

is

automallcally achieved

..

\11

elliptic function filter

(C31 thru C35, L4 & L5)

at

the

power

amplifier output rejects higher order harmonics. Transmitter RF

output is sampled to present Relative

RF

Output on the

VU

meter

with tbe switch (S2),

011

the exciter,

in

the REL RF

OUT

position.

The

elliptic filter is designed to operate over one-third (1/3)

of

the

530

kHz to 1710

kHz

AM

band.

Sectioning the

band

with

different filters is necessary

because

of

the

width

of

the band.

For

example; the

second

harmonic

of

530 kHz falls

within

the band at 1060 kHz, and the third

harmonic

at 1590 kHz is

also

within

the band.

The

low-band filter covers 530

kHz

to 830 kHz, mid-band 840 kHz to 1270 kHz and

high-band 1280 kHz to

1710kHz.

Any field

change

of

frequency will

be

restricted to the

operating

range

of

the filter.

For

example: a 640

kHz

transmitter

can

be

changed

to operate on

710kHz

by simply

changing

the crystal,

but

it cannot be

operated

above

830

kHz

without first

bel11g

retumed to tbe factory for a new elliptic output filter and

adjustment

of

the

power

amplifier.

Page 4

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PO~ER

AMP

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SCHEMATIC

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DIMENSIONS

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CORD

CHASSIS \/IEWED

FROt-.1

BOnOM

TPANS~,~I-I

FIG.8

IER CONNECTIONS

From the library of WØMTU

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..

.

'll"ie

\

'~:-1~

;ICl

e;

2l1G

"Lhe

air

circula:;·Jl1.

Do

l,CJ[

;,lOUDt

,11e

transminer

to an ('lectnca)}y

conductive

surf8ce. We

recommend

a ',"ooe

OJ

similcH

backboard.

Holes

are pro\'ided

in

the rear

of

the chassis ror thTee (3) screws

to

mO'..lnT the tr8ns'i:1iner to 2 vertical

s\.1rTace.

Scre',\s.

=j

0);

5'8", aj'e supplied. Refer [C! Fig. 7

Tor

proper

rilounting.

5.2

Interfacing

the

Transmittel'

AC

power:

The

transmitter

requires a standard 117 VAC, 50/60

Hz.

outlet A 6 foot, 3

conductor

line

cord

with

3 pin

AC

plug

is supplied,

DO

NOT

REMOVE

GROUND

FROM

PLUG.

A

UDIO:

The

audio input

impedance

is 600-ohm

transformer

balanced.

Any

input level

between

-15 dBm

and

+15

dBm (0.14 VllliS to 4.3

Vrms)

will

provide

100%

modulation

(with

the

Audio

Gain

control R4

property

set).

Connect

the

audio feed line to the

AUDIO

IN terminal block on the

bottom

of

the

transmitter

chassis.

(see

fig.

8)

RF

Output:

The

RF

output

impedance

is industry-standard 50 ohms,

unbalanced,

using

an

SO-239

UHF

type

connector

(see

Fig, 8).

The

RF

output

cable

must

be

50

ohm

coaxial.

Type

RG-8/U

is

recommended.

For

short runs, type

RG-58/U

is acceptable.

NOTE:

A

strong

RF

field eXIsts

within

a few feet

of

the transmitter and

may

affect

the

operation

of

other

equiplYlent located

in

close

proximity

to the transmitter.

6.0

CONTROL

SETTINGS

AND

OPERATION

6.1

User

Control

Descri.ptions

and

Locati.ons

A

number

of

trim

pots

are located

inside

the transmitter.

Some

are factory set

and

sealed.

Removing

any

of

the

seals will void

the

warranty.

User

adjustable

controls

include:

Pm-ver Switch (Sl) located on

the

pO\:ver

supply board.

The

red

LED

will

be

on v,ihen

power

is applied.

Meter

Switch (S2)

located

below

the

meter

on

the

exciter

board.

This

switch selects the

function

of

the

meter

to indicate

Relative

RF

Power

Output or

Percent

Modulation, [see section 4.3.1 and 4.4)

Audio Gain (R4) located on

the

upper

left

comer

of

the

exciter. This adjusts

the

audio

gain

of

the

transmitter

to

provide

100%

modulation

for any audio input level between -15

dBm

and +

15

dBm.

RF

Drive

(R31) located

lower

center

of

exciter board. This control adjusts

the

RF

drive

to

the

final

power

amplifier

for the desired

RF

output

po:wer between 10% and 100%

of

rated

TPO.

6.2

Setup

and

Operation

Refer

to section 6.1

of

this manuaJ and the

operating

lllstructions located on the

inside

of

the

transmitter

fro;'}t panel. With

power

s\\itch

(S

I)

off

(dov,n position)

make

sure

RF

Dri\'e le'vel (R31) and

Audio

Gain

(R4) are

at

MINIMU1\1 (full counter-clockwise).

1.

Be

sure all connections to and from

the

transmitter are secure,

')

TUlll transmitter

power

switcll on.

Place

.flieter FUllction Switch in the Relative

RF

Output positio;l (REi.

RF

OUT).

P&ge

5

3

From the library of WØMTU

-"-(

,':

~y.......

.,

:":::

J.

Apply program

materi'l.!

(audio source]

to

transrnitter

Set

Meter Function

SWilCll

to

percent

mod:.,lation positio'l

(~;

\10D).

is

Adjust

),xiio

Gaw Control

(R4).

Set

gain

I •

so

that

fneter

reads

no

highe:'

'~han

louoeST

prograiTI

1:1atericl

peaks

NOTE: Modulation can also be set using

an

oscilloscope by connecting the scope probe across the

RF

output. Adjust the Audio Gain (R4)

so

that

the

negative modulation peaks are just begmning

to

pinch off

the carrier, then back

off

RJ4

slightly. At a sholi distance from the transmitter, use any

AM

radio

to

listen

for distortion

and

check the quality

of

the audio. Placing the radio close

to

the transmitter may cause input

overloading

to

the radio

and

result

in

a misleading interpretation

of

signal quality.

7.0

BASIC

TROUBLESHOOTING

GUIDE

PROBLEM POSSIBLE CAUSES

LED power indicator does not light No Power on AC receptacle or FI blown

No fuI: output indication Fuse FI and/or F2 blown.

Drive control

R31

set

to

minimum

Meter switch (S2)

in

% MOD position

RF

output reads off scale when Open

RF

output cable

control (R31)

is

advanced

Fuse (F2) blows after a sholi period

of

Defective QI

Operation

No modulation indication with RF output Audio GAIN control (R4) set

to

minimum

No Audio from source.

Audio distortion heard

on

radio Audio Gain set

to

high.

Receiver

is

to

close

to

transmitter.

8.0 MAINTENAJ\'CE

These transmitters are designed for continuous 24-hour service. Peliodic checks

of

the transmitter and

associated eqUipment are recommended

to

catch any problems that may rise.

Page 6

From the library of WØMTU

Fe!

::.=,.

,.;\'1

~l;:;'

SCi-iSril3l:ics:

1

LPB

PARTS

USTS

Sherf

assembly

-

Assemb!y

l\umbsr

600i-A

Symbol

Qty

Description

Part

#

.<

I

AM-30

F[NAL

ASSEr\~BL

y

6002-A

1 i RF

FRONT

PANEL

521-6034-A

3 2

LATCH

GROMET-NYLON

309-1021

4 2

LATCH

PLUNGER

309-1020

5 1 3'

RG-58A/U

COAX,

W/PL-259

933-1040

6 1

AM-30/60

[NSTRUCTION

SHEET

441-6004-A

73 # 10 X

112"

HEX

HS

SHEET

MTL

SCRE'v\!

301-6412

I

8 2

FORK

LUG,

# 6

STUD

22-18

GA

WIRE

195-1015

RF

POWER

AMPUF~ER

6005-A

1 1

POWER

AMP

PCB

671-6008

R39

1

TRIM

POT,

1K OHM

775-1080

R40 1 RES. 680 R, 1/2W,

5%

762-2117

R41 1

RES.

4.7

R,

1/2W,

5%

762-2065

R42,43

2

RES.

22

R,

1/2W,

5%

762-2081

C27,29,38

3

CAP

..

i UF,

CER

DiSC

50V

174-2197

C28

1

CAP.

22UF,

RADiAL

63V

20%

172-1067

C30

1

CAP

..

33UF,

MYLAR

100V

10%

175-1091

C37

1

CAP.

470

UF

AL

CAP

AX!AL

50V

172-2153

A5

1

LM317T

(TO-202)

363-1001

010

1

DIODE,

1

N4007

781-1037

Q4

1

TRANSISTOR,2N5190

781-1004

Q5,

Q6

2

PWR

TRANSISTOR,

SO-1407

782-1211

L2,L3,T3

3

FERRITE

TORROIO

.75"

201-1005

Page 7

From the library of WØMTU

~

-,

,.,

-.

-

,-

...,

~\...

:.

'-"-.::;

c.

3[

HEp<TSr!~~(

TO-202 PRESS

Or'~

332-'1005

::;

SCREW', .i-40 X

3/8

PH

PHfUPS

30'1-'1i08

5 0

" SCREW, 6-32 X i

/2

PH

PHlLlPS

301-i212

6 6 LOCKVvASHER, EXT

'#

6 303-1010

!..:

'-'

...

/6 KEPS NUT, 10-24 302-6020

9 4

LOCK

WASHER,

#-

4 302-1004

"11

;,

I MICA INSULATOR 789-1021

12-17

HOOK

UP

WIRE 931-10**

C31

Thru

C35 SEE NOTES

L4, L5 SEE NOTES

NOTES"",

..

1.

USE A THIN COST OF

THERMAL

HEATSINK

COMPUND BETWEEN

COIVIPONENT

AND

HEATSINK.

SCRAPE

PAINT!F

REQUIRED.

2.

52

UH

FERRITE CORE TORRO!DAL -SEE SCD # 184-1005

3.

RF

TORROIDAL

TRANSFORMER INPUT TR!FIAL- SEE SCD #865 1005

4.

RF

TORROfDAL

TRASNFORMER

OUTPUT

-SEE

seD

# 865-1010

5.

QUANTiTY

EQUALS

LENGTH

IN

iNCHES

6.

FILTER

COMPONENT

VALUES VS FREQUENCY

RANGE

--------

LOW

BAN

D -----------------MID

BAN

D----------------------HIGH

BAN

D -------------

C31

3600PF (171-1218) 2400PF (171-1202) 2000PF (171-1197)

7.

C32 1000PF (171-1176) 680PF (171-1164) 200PF (171-1120)

8. C33 5600PF (171-1236) 3600PF (171-1218) 3300PF (171-1215)

9. C34 3300PF (171-1215) 2200PF (171-1200) 750PF (171-1167)

10. C35 2200PF (171-1200) 1500PF (171-1188)

1600PF

(171-1191)

11. L4 9.3UH SCD #184-1032

6.1

UH

SCD #184-1023 5.5UH SCD # 184-1021

12. L5 5.8UH SCD #184-1024 8UH SCD #184-1018 4.0UH SCD # 184-1018

From the library of WØMTU

EXCiTER

BOARD

ASSEMBLY

PIr'J

6815·/\

Symbol

Qty

Description

Part

#

f-Jotes

1 1 PCB, EXCiTER- AM30/60/1

00

671-6013

R3 1 RES. 620 OHM

1/2W,

5%

762-2116

R4,R31 2 TRIMPOT, 10KVT 775-1130

R5,R19,R51 3 RES.

10K

OHM,1/2W, 5% 762-2145

R6,R7,R47, 5 RES.

47K

OHM

1/2W,

5%

762-2161

R53,R54

Ri6,

R17,R22 3 RES. 1K

OHr,,1,

1/2W,

5%

762-2121

R33, R34, 2 RES. 1K OHM 2W,

5%

762-4121 2

R9,R30 2

R·ES.

100K

OHM

1/2W,

5%

762-2169

R'1

O,R11

,R14 5 RES. 100 OHM

1/2W,

5%

763-4097 2(r14)

R21,R24

R12,R55 2 TRIMPOT, 1

KHZ

775-1085 1

R13,R18 2 RES. 1.8K OHM

1/2W,

5%

762-2127

R20,R27 2 RES.

3K

OHM

1/2W,

5%

762-2132

R15,R23 2 RES. 820 OHM

1/2W,

5%

762-2119

R25 1 RES. 47 OHM

1/2W,

5%

762-2089

R26 1 RES. 1.3K OHM

1/2W,

5%

762-2124

R28 1 TRIMPOT, HZ

TMWHEEL

775-1135 1

R29 1 RES. 2.2K OHM

1/2W,

5%

762-2129

R30 1 RES. 300 OHM

1/2W,

5%

762-2108

R35 1 RES. 220K OHM

1/2W

5%

762-2177

R36 1 RES.

50

OHM 5W,

5%

765-1247

R37 1 RES. 3.3 OHM

1/2W,

5%

762-2061

R52 1 RES. 22K, 1/2W,

5%

762-2153

C4,11,12,14

7 CAP

.1

UF CER DISK 50V 174-1254

CiS,

18,21

C22.

C5,C19,

C25 3 CAP .001

UF

CER DISK 1000V 174-1155

2

From the library of WØMTU

C23

i

COI-.JTIt-.JUED

....

Synlbo!

C24

Al,A6

A2

A3

A4

D4

05,6,7,8

D9

T2

L1

L6

2

82

Q2

Q3

XI

3

4

5

6

7

8

9

10

11

12

14

15

i6

1

2

1

4

1

14

1

3

1

2

1

CAP

,33 UF fViYLAR

100V

10%

Descr'iption

CAP

.15 UF

MYLAR

lOOV

10%

IC

RfVi74'lDC

(14

PIN DIP)

IC

MC12061

P ( 16 PIN DIP)

IC

LM7492PC

(14

PIN DIP)

IC

MC1496P

(14

DIP)

DIODE

1

N4742A-12V

DIODE,

ZENER

1

N270

D!ODE,

ZENER

1

N4733A-5,

1V

1W

TRANSFORMER,

LINE

IN

FERRITE

CORE

330 UH

FERRrTE

TORRO!D

.075"

MAGr\!ET, 20

AWG

SWITCH,

DPDT

TRANSISTOR,

2N3904

TRANSISTOR,

2N3879

CRYSTAL

SOCKET

VU

METER,

1.5"

COPPER

BUSS

WIRE

20

AWG

SOCKET,

TRANSISTOR

3 PIN

HEATStNK,

TO-66

PC

MT

SOCKET,

IC

14

SOCKET

HEADER,

14

P[N

SOCKET,

IC 16 PIN

SCREW

6-32 X 3/8 PH

PHfUPS

NUT, 4-40

HEX

NUT

W/LOCKWASHER

KEPS

COPPER

WIRE,

18

AWG

PVC

TUBING,

CLEAR

20

AWG

,

~.

r: .' .

"',

......

t.-

__ ,

/

~,-

,J.,/

/

-:'"

: [

t...

i I : !

\75-1091

Part

;:;:

Notes

175-1091

361-1013

361-1005

364-1001

361-1023

781-1072

781-1015

781-1063

863-1075

184-1330

201-1005

3

939-1012

4

821-1013

782-1072

782-1069

5

6

216-1002

541-1001

935-1016

4

789-1001

331-1012

365-1003

365-1010

365-1005

301-1208

302-1005

302-6018

935-1017

4

936-1003

4

From the library of WØMTU

r~OTES

1.

MOUNT

ON

BOTTOM

OF PCB

2.

MOUNT

SO

BODY

OF CO[\'IPONENT

[S

i/8"

TO 3/'16"

ABOVE

PCB

3. 52 UH FERRITE CORE TORROIOp.L

SCG

#.

184·i005

L

QUANTITY

EQUALS

LENGTH

[h)

[NCHES

5.

USE A THIN

COAT

OF

THERMAL

HEATSfNK

COfViPOUND

6.

6X

CRYSTAL,

STANDARD

TOLERANCE,

10KHZ

SPAC[NG

POWER

SUPPLY

ASSEMBLY

6807-A

Symbol

Qty

Description

Part

#

1 1

POWER

SUPPLY

PCA

671-6018

R1

'1

RES. 1K OHM

1/2W,

5%

762-2121

R2 1 RES. 390 OHM

1/2W,

5%

762-2111

C:R2

1 DIODE,

ZENER

1N4751A-30 781-1081

CR3 1 RECTIFIER, 1

N4007-1000V

781-1037

DL

1 LED, T 1 % RED 473-1006

C2 1

CAP

220UF

AL

CAP

50V

-10/+50%

172-2132

C3 1

CAP

6800UF

AL

CAP

25V

-10/+50%

172-2228

F1

1 FUSE 2

Y2

AMP,

250V

SLOW

BLOW

691·1017

1

QUICK

FIT FUSE

COVER

699-1020

2 2 FUSE

CUPS,

PC

MOUNT

699-1001

From the library of WØMTU

LPB AM-30P Series User manual

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