Telex PST-170 User Manual

Telex

Operating Instructions

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Personal Listening Systems

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ST-170

PST-170
17 Channel
Synthesized Transmitter

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PST-170 SPECIFICATIONS

Number of Channels ·············17User Selectable Channels
Power Output ·············80,000 uV/M at 3 meters, maximum
Antenna ···················Permanently attached trailing wire
Modulation ·······················FM,+/-25KHzDeviation
Frequency Response (System) ············100Hzto10,000 Hz

Audio Input:

Microphone, 7.75 mV RMS input for 25 KHz deviation.
Impedance, 10 K Ohms, nominal.
Aux. Input, 100 mV. Unbalanced, 100K Ohms, nominal.

Audio Input Level ············0-42 dB attenuation in 6 dB steps
Signal to Noise Ratio: ·······················Normal 58 dB

EDR enabled 77 dB

Pre-emphasis ····························115uSeconds
Power ··············2AAAlkaline or Nickel Cadmium batteries
Battery Life ······························8Hrs-Alkaline

4 Hrs - Nickel-cadmium

CHANNEL ASSIGNMENT

Channel # Freq. (MHz) Channel # Freq. (MHz)

A 72.1 J 75.5
B 72.2 K 75.6
C 72.3 L 75.7
D 72.4 M 75.8
E 72.5 N 75.9
F 72.6 0 74.7
G 72.7 P 75.3
H 72.8 Q 75.4

I 72.9

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ANTENNA

PersonalListening Systems

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ST-170

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AUXILLIARY
INPUT JACK

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BATTERIES

Front View

Side View

The PST-170 Transmitter uses two AA batteries. Position
them in the battery compartment as illustrated. You can ex­pect 8 hours of operation from alkaline batteries and 4 hours
on nickel-cadmium batteries. Charge Pins are provided on
the bottom of the unit that fit Telex drop in chargers.

CAUTION: Do not attempt to recharge alkaline batteries as this
may result in personal injury.

BELT CLIP

BELT CLIPBELT CLIPBELT CLIP

BATTERY
ORIENTATION

BATTERY COMPARTMENT COVER

NOTE: If the unit is to be stored for any length of time be sure to

remove the batteries from the unit.

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Transmitter Channel

The PST-170 Transmitter may be set to any one of 17 channels.

Two Transmitters cannot operate on the same channel un
less separated by 300 feet (91 m) or more (which is the aver
age maximum operating range). If two transmitters are
operating on the same channel inside this perimeter, the re
ceivers will pick up the FM signal of both transmitters, caus
ing a squealing sound to be heard.

Antenna

The transmitter uses a flexible wire “trailing” antenna that is
permanently attached to comply with FCC Part 15 Rules. Do
not cut or lengthen the antenna. Do not coil the antenna and
place in your pocket. This is a tuned antenna and modifica­tion will shorten the range.

Audio Input

There are 2 audio input jacks on the transmitter. One is the
Auxiliary
teachers aids or tape players to be used. The input jack is a
1/8 inch (3.5mm) stereo/mono jack. Typical input level is 100
mV RMS maximum for normal modulation. More than this in
put will cause the audio to “limit” which may sound unnatural.
Reduce the input level, if this should happen, by turning
down the input device.

input designed to allow audio devices such as

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