Ptek FM50E Guide

Operating Manual and User Guide
BROADCAST FM EXCITERS
FM25E
FM50E
FM250E
FM SERIES
PTEK

Limited Warranty
PTEK (SELLER) warrants that products are free from defects in material and workmanship and meet
p
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;
(C) Minor deviations from specifications which do not affect performance are excluded from this
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 two-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 two 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 material
prepaid. Defective material should be addressed to:
PTEK
PTEK
111 N. Vista Rd. Ste 3E
Spokane Valley, WA 99212
[phone]
[email protected]

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

MONAURAL
OPERATION
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
Specifications
ENVIRONMENT
Altitude: Ambient Temperature
0-10,000 ft -10 to +50 oC
WIDEBAND
OPERATION
Inputs:
Input Level:
Wideband Amplitude Response:
Composite Unbalanced 10k Ohms
SCA 1 Unbalanced 10k Ohms
1.25 V RMS. (3.54 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:
25W,50W, 150W, 300W
150 W (for 50W 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
To 100 kHz deviation
Deviation, Forward Power, Reverse Power, Final I & V
-70 dB, min.

1
45
Rear panel layout
876
5
12
34
Page 6
Front panel layout
. DEVIATION
23
8
AC IN
SCA
FUSE
RF OUTPUT
FINAL CURRENT
FINAL VOLTAGEFORWARD POWER
REVERSE POWER
ADJ
POWER
OFF
OPERATE
REMOTE OFF
FAULT
DRIVE LOW
FM Series
PTEK
FM25E
DEVIATION
30
25
20
15
10
5
OUTPUT POWER W (REV X0.1)
4.0
40
3.0
30
2.0
20
1.0
10
0
0AMPS
PTEK
VOLTS
DEVIATION kHz
100
75
50
25
ON
REMOTE
PWR PWR
VOLTAGE
FWD REV
OFF
CURRENT
FINAL
MONO IN
600 OHMS
RAISE
LOWER
GAIN
GAIN
GAIN
COMPOSITE
10MHz 1MHz 100kHz
FREQUENCY