LPB AM-60P User manual

• Ine. 28 Baeton Hili Road. F'raz.r. PA. 1 gJ~~ (21 ~)B44-' 123
INSTRUCTION MANUAL·
for
MODEL AM-60P
®
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PSSA I PSRA
LOW POWER
AUTHORIZATION

AM Broadcast Transmitters
AM-60P AM-30P
Since 1960, LPB has been the internationally
recognized leader in low power AM broadcasting.
LPB uses the very latest RF technology to provide
the most rugged and economical transmitter for low
power commercial applications, travelers' informa-
tion and carrier current systems.
The AM-30 and AM-60 series transmitters use an
internal meter to monitor modulation level and RF
power output. Modulation level on the AM-5 is
indicated by a quick response LED peak flasher set
to illuminate at 100% peak modulation. This indi-
cates true peak modulation of the transmitter and
provides a means of maintaining maximum undis-
torted modulation ofthe signal. RF power onthe AM-
5 is monitored by a second LED that also serves as
a "power on" indicator. RF output power is continu-
ously variable on all transmitters so that a precise
setting can be chosen by the user.
All LPB low power transmitters are designed for
universal application including AM stereo. With a 50
ohm unbalanced RF output, any transmitter can
readily interface with direct radiating systems using
impedance matched radiators. The companion
TCU-30 Transmitter Coupling Unit is used for carrier
current installations and other applications utilizing
non-standard radiating elements.

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AM-5
Transmitter Specifications
R.F Power Output
AM-5 Adjustable, 1 to 5 Watts (carrier)
AM-30 : Adjustable, 2 to 30 Watts (carrier)
AM-60 .......................•......•..................................................... Adjustable, 6 to 60 Watts (carrier)
R.F Power Adjustment ...........•.....•....•.....•....•.....•......................•............................. Internal
R.F Power Indicator
AM-5 Green LED
AM-30, AM-60 Internal Meter
Type of Emission ...........................•.....................•............................ 30A3 (Amplitude Modulation)
Frequency Range ................•..................................................•................. 530 kHz to 1610kHz
R.F Output Impedance ................................•................................•.............. 50 ohms, unbalanced
SO-239 connector
Carrier Frequency Stability ± .003%, -20°C to + 50°C
105 to 128 VAC line (-4°F to +122°F)
R.F Harmonic Suppression ........................................•.................................... <45dB below carrier
Carrier Shift ................................••.....•.....•.................................. '.' ... < 2%, 0-100% Modulation
Noise Level ........................•....•.....•..........................•........... < 55dB below 100% modulated carrier
Audio Input Impedance ...............•.................................•..................... 600 ohm, transformer balanced
Audio Input Level -15dBm to +1OdBm for 100% Modulation
Optional Limiter Factory set to prevent more than 100% Modulation
Attack Time: 3.3 ms
Release Time: 330 ms
Audio Frequency Response 20 Hz to 15 kHz ± 1.0dB
Audio Distortion ................................................•...........................•........ < 2%, 95% Modulation
Modulation Indicator
AM-5 ................................................••....•....................................... Red LED peak flasher
AM-3~, AM-60 ..................................•........................................................... Internal Meter
Modulation Control ......•....•................•........................................................ Internal Adjustment
Power Input 117VAC, 50/60 Hz
Power Consumption
AM-5 ...................•..............................•...............................•....................... 45 Watts
AM-30 ..........................................•............................................................. 150 Watts
AM-60 ......................•............•..........................•......................................... 250 Watts
Dimensions
AM-5, AM-30 ............................................................................•........... 12"H, 6.5"D, 11.75"W
AM-60 ................•.............•..........................•......•................................. 12"H, 6.5"0, 23"W
Weights
AM-5 .................................•..................................•............•.......................... 121bs
AM-3~ 20 Ibs
AM-60 ..........................................•................................................................ 36 Ibs
LPB
LPB Inc.
28 Bacton Hill Road, Frazer, Pa. 19355 [phone] 3/88

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Meter
Detail
•
The LPB Model TCU-30 Transmitter Coupling Unit is required when
coupling an AM transmitter into a non-impedance matched inductive
radiator, such as electrical power wiring systems or other distributed
wiring systems. The TCU-30 is the third generation result of over 20
years experience and product development in carrier current
technology.
All functions required for optimum coupling (matching) into single or
3-phase power systems are provided by the TCU-30 including power
line inductance correction, impedance selection, power line isolation
and complete metering.
The TCU-30 is specifically designed to eliminate internal toroid
heating, one of the major causes of coupling unit failure that has
plagued all previous designs. Other innovations include extremely
broad impedance matching selection (21 steps) and a calibrated
transmitter power output meter with a direct reading VSWR scale. Such
metering allows accurate measurements of power and VSWR from
only one watt to the rated maximum output of 30 watts.
With modular construction, any two units in this equipment series can
be rack mounted. For additional flexibility, the individual units may be
wall mounted in any convenient configuration.
TCU-30 SPECIFICATIONS
Power Input 30 watts RMS, continuous
Input Impedance 50 ohms, unbalanced
Output Impedance 0.5 ohms to 65 ohms (1:1 VSWR)
0.2 ohms to 130 ohms (2:1 VSWR)
Output Impedance Selection 21 steps
Frequency Range 530 kHz to 1610kHz
Inductance Correction 100 pf to 10,900 pf in 109 steps
Matching Circuit 2 stage toroidal, bifilar
and pentafilar wound
Input Connection SO-239 coaxial connector
Output Connection Screw-terminal barrier strip
AC Line Connection
(output) 660 VAC line to line (1100 VAC optional)
380 VAC line to ground (635 VAC optional)
Metering Transmitter power output (0-30 watts)
Voltage Standing Wave Ratio (1:1 to 6:1)
Dummy Load 50 ohms, non-inductive
Controls 21 position impedance selector
2 capacitor decade selectors, capacitance
decade IN-OUT, SWR calibration
Function switch: Power, Calibrate, Test (Match), Operate
Minimum Power Input
for accurate matching 1 watt
Size 12"H, 6.5"D, 11.75
n
W
Mounting .................•.......... Wall mount or rack mount
Weight 15 Ibs
LPB
LPB Inc.
28 Bacton Hill Road, Frazer, Pa. 19355 [phone] 3/88

[~_M_O_D_E_L_L_A_-_3_0_3_0_-wt_'a_tt_L_in_e_Ur_RF_A_m_7fJ_ll_ift_'er J
The LPB Model LA-30 Linear RF Amplifier is used as a 30 watt signal repeater to boost the RF output signal
within an RF distribution system or a carrier current system in a very large building or complex of buildings.
SPECIFICATIONS
R.F. Power Output Adjustable 2-25 watts
Frequency Range 530 to 1610kHz
Distortion Intermod 30dB down or
better at 30 watts output
R.F.Input Impedance 50 ohms resistive
Input Level 0.25 watts min. 2 watts max.
(3.5 to 10 vrms carrier)
Connectors 2 type SO-239
coaxial connectors
Power Requirements 117 VAC, 50/60 Hz,
150 watts maximum
Weight 15 Ibs.
Size 12"H, 6.5"0, 11.75"W
[~_M_O_D_E_L_T_-_1_A_R_ow_er~~_uu_~ ~J
The LPB T-1 A Power Splitter accepts an RF signal output from a low power AM transmitter and divides the
output power into equal portions. This may be required to drive two or more RF distribution systems in adjacent
locations.
Standard models of the T-1A are available to divide the input power into 2, 3, 4, 5 or 6 equal portions.
SPECIFICATIONS
Input Impedance 50 ohms, unbalanced
Output impedance 50 ohms, unbalanced
Power Input Up to 50 watts RMS, continuous
Frequency Range 360 kHz to 2 mHz
Outputs ..... 2,3,4,5 or 6 (specify when ordering).
Insertion Loss 3dB per output
Input/Output Connections Standard SO-239
coaxial connectors
Dimensions Width 6.25", Height 7.25",
Depth 2"
Weight Approximately 14 oz.
Special division ratios and impedance levels available to order.
[__N_F__ s_en_e_S_R_ad__ ~_u_n_g_G_ab__k ~J
LPB "NF" Series Radiating Cable is a controlled radiation "leaky"
coaxial cable for use in Restricted Range AM Broadcast Systems.
The NF-1 0 Cable is designed for use where no more than a 1,000
feet continuous linear transmission zone is required. The NF-2D cable
is a lower loss, heavy duty cable, which may be used for a linear
transmission zone of up to 5,000 feet.
Construction Coaxial, with drain wire
Dielectric Solid polyethylene
Jacket Polyvinylchloride (direct burial)
Characteristic Impedance 50 ohms, @1 mHz
Dimensions NF-1 0: '14" Dia., NF-2D: 7116 Nominal,
V2 Max. Dia.
LPB
LPB Inc.
28 Bacton Hill Road, Frazer, Pa. 19355 [phone]
SPECIFICATIONS
3/88

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INSTRUCTION MANUAL
LPB MODEL AM-60P TRANSMITTER
PSSA/PSRA LOW POWER AUTHORIZATION
TABLE OF CONTENTS
DESCRIPTION
·INTRODUCTION
WARRANTY AND SERVICE INFORtv1ATION
Lirniteej Warranty
Service
APPLICABLE FCC RULES
FCC t
v
leierinq F:equirernents
Advisinq the FCC
CIRCUIT DESCRIPTION
Surnrnary
Power Supply
Exciter
Au(lio
Oscillator
HF Pre-Driver and Driver Sta~les
HF Power Arnplitier
INSTALLATION
Location and t
v
10untinq
tntertaoinq tt-,eTransmitter
CONTROL SETTINGS AND OPERATION
User Control uescriptlon and t.ocation
Setup and Operaiion
MONITORING AND REMOTE CONTROL
Modulallon t-tonitorinq
LPB Tri-power Opilonai rernote
BASIC TROUBLESHOOTING GUIDE
MAINTENANCE
PARTS LIST AND SCHEMATIC
PAGE
1
2
5
9
10
10

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INSTRUCTION MANUAL
LPB MODEL AM-60P TRANSMITTER
PSSA/PSRA LOW POWER AUTHORIZATION
1.0 INTRODUCTION
Low Power AM Transmitters are the product of LPB's nationally ree(l(;lnized
oroadcast experience since 1960. This 'P' version solid state transmitter utilizes state-
of-the-art tec:hnolo9Y and has been Type Approved for licensed use under F'AHT 7:~:oi
the FCC Hules and He9ulations.
The transrnitter power output (TPO) of 60 watts is adjustable down to about 10
watts, Two F:Fpower amplifiers are driven by the standard "P" version exciter. Their
cutouts .• t·,', tl'l p", ,.,,') 'Yl t} I' t'l '·'U·~ Vi.., .-:,('''-) f··ll,:,,··t,· ,'J f""1 torr o i,.~ ·.1 s-, (',<1"'," ,'.,-, •.•.• 1-. i,',,',.' ••. T ,-i D (',' I,',,-
_ 1-4 r.J. c (.... t:=" ......• 1 I \.1 \. I. t:: I ,... t.:t ." i.. I Y '\,..I I \. I Lt ".J t J ". I \., (.t 1 F .' ,-V t:=' I \.1 t• .I I I i Uti I c:: I • ~. I I 1- I .J ••. r:: I
option is available for remote power reduction. This option is ( esGrilw(j I;':j.terin this
manual,
2.0 WARRANTY AND SERVICE INFORMATION
Z.l Limited Warranty
We guarantee that you will fin(l the appearance, workmanship and
standards ot ..aterial z '1" rstr tion ot ttus eouiornent l k~""( '·t·ltl·~·~n·I'·'·~j'··
~ Llll <. L1I t " ~) t n L1 ... 11 (1 .1 n t oo II" fUo I.JII.J I L e q. .1. I" • rIe II In '.' e p 1I1::l Wit. ,I. '.1 r- p I <.' ci .10 II
and with qoo d standards of commercial practice.
For a period of one year frorn date of delivery, VJe guarantee U'ds
equipment aqainst any fOITIi of failure provided that, in the opinion of H'IE' marunacturer,
no improper use of or mooitication to this equipment is at fault The 9uarantee also
requires that the equipment is properly installed and operated within state(j parameters.
D ·"1tl"I:" .' :I LPB '11t '1:'1 .rt "rl""- jl'-I'" ",' 'I:'I"'\II:' ' ,·,,··rCl,·,t·-·\
Will£' II.•pe lo ., WI Urnl.•1 nl.1,ell.:.1." .1n( ,(1.. ... 1 II. our" .1..'1)" 0 ,....lI, ..-...._.:1 IY
failure. SI'dpping charges are the responsit.ility of the customer.
After warranty expiration, service will continue to be available horn LPB.
Z.Z SERVICE
TI"
i <' ,:,,', U" pment is d ,',co " ('1 n,.".,.::. '··l·j ( f' ,', stn J (·,t
6(·,
j'" /. o rlt,' f'I'" 'I···· t' 6<' I uts an "J
•• ...) 'Vl -1 I~ ".,) t:=..):;J Ct. ull I .~·JJI~" '. _~ ~ _ '"•., _ r- 11.4 II ~..)·A v '- v,
minimum failure. If any problem or question should arise, please call or 'Nrite LF'E:
co storner S.. ·('~··("··I··~t~1 ldenlilioalior ··d·l· .. atior nlot r ~h'l I('nrrl '.j'
AL ... 111..1 0efVL, ... 11.111Ie . 1~1'.' y. I. ... 111 ,.'{11011 II"Ulrlc11-J1, W 111.,.1YJU ~.. (.u ...: I.•. vlce
PAGE (1)
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wnen callinq or writing inctudes: rni)clel number, serial number, operatinq frequency
and date 01purchase. This information is found on the indentiticaiion label on the
transmitter.
This equipment 1 in qeneral, IS NOT USER SERVICEABLE. Ifa
maltunctlon arises or is suspected, we urqe you 10 return the equipment to Ihe taotory
for proper repair.
If tlw neer:1for service arises contact LPB's Customer Service Departrnent
for a Material Return Authorization (MRA) and snippinq instructions before
shipment. The MR/l. number must be on the shippinq lal:lI:-1.
LPB, Inc. Phone [phone]
FAX 215-644-:3651
3.0 APPLICABLE FCC RULE
3.1 FCC Metering Requirements
In paraqraph 10 of Report and Order in the matter ot t"'/v Docket 85-1 25,
adopted December 20, 1985, the Cornrnission ammended Part 7:~:.5:3 lo read as
follows:
"However, auxiliary transmitters with nominal power ratinqs of 100 watts or
less are not required to be equipped witti instruments to cieterrnine power t)y
the indirect method provided that tt-Ielicensee can deterrnine the antenna
input power at atl times."
The Relative Power Output meter in the LPB A vI-60P lransmitter dews nol
satisfy this metering requirement. We suqqest the licensee ernploy an Antenna Current
t.J eter, such as the Simpson model 37 (3-1 J2'rJ HF Ammeter, V/t-Ien lo okinq into a 50
ohm load, the 60-watt transmitter needs a 0 - 1.5 A. full-scale ammeter.
It shoulc be noted that the Commission does not require this HF ammeter
rueter to be in the circuit at all times, however, you must have and use this capability to
measure the output.
3.2 Advising the FCC
When installing a transmitter for use with low power authorization, nIl?
user must advise the Commission, in writing, of this action. TI-;8rnake an,] rnoclel
number of the transmitter must be submitted.
PAGE (2)
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r
1-
AM-60P TRANSMITTER BLOCK DIAGRAM
RF OUTPUT
RELATIVE RF
f------
POWER METER
COMBINER
I
RF POWER
MODULE
SPLITTER
EXCITER
l
RF POWER
MODULE
POWER SU PPL Y I------'
POWER SUPPLY
PfrlI13" 2. Ii
AUDIO INPUT
FIGURE #1