User Guide

Design Features

Comfortable foam-filled headband pad and ear cushions. The headband pad evenly distributes the headset weight, with no pressure

points, for maximum comfort. The ear cushions combine comfort and light weight with an excellent acoustic seal. An outer urethane

layer ensures long life. Gel-filled ear cushions are also available for this headset for users who prefer this type. All cushions are field-

replaceable.

Boom Microphone: The boom arm features a sealed ball-and-socket joint and flexible boom for precise microphone placement

on any head size. The boom and cord rotate for microphone placement on either side of the head. The microphone cartridge is an

electret condensor element. The microphone housing and cartridge are easily removed for replacement.

Cordage: The microphone cordage is protected inside the boom arm. Shielded wire throughout the headset protects against RFI

and EMI. Strain-reliefs on all cords provide maximum durability.

Operation

Headband Pressure Adjustments

There are three pressure settings. Increasing the pressure will improve the seal between the earcup and the head for greater noise

reduction. To change the pressure setting, remove the headset and fold the earcup inward as shown, then rotate the adjustment

knob to the desired setting. Repeat for both earcups. Both sides of the headband should be set to the same pressure setting to keep

the headband properly centered on the head.

General Description

The Telex PH-3500 is a passive noise attenuating head-

set for use in a noisy environment. Dual controls allow

the user to individually adjust the volume level for each

ear. Using the latest design and modeling techniques, Telex

has been able to maximize the amount of hearing pro-

tection provided by the PH-3500, while at the same

time minimizing weight. The PH-3500 has a noise re-

duction rating of 24 dB, and is suitable for use in noisy

environments. The PH-3500 features a unique headband

design that provides comfort for long periods of time.

Two versions of the PH-3500 are available: with a male

or female XLR4 connector.

HIGH MEDIUM LOW

Telex

Description and Wiring Diagrams

Model PH-3500 Headset (300623 Series)

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Telex ® Description and Wiring Diagrams Model PH-3500 Headset (300623 Series) General Description The Telex PH-3500 is a passive noise attenuating headset for use in a noisy environment. Dual controls allow the user to individually adjust the volume level for each ear. Using the latest design and modeling techniques, Telex has been able to maximize the amount of hearing protection provided by the PH-3500, while at the same time minimizing weight.
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PH-3500 Headset Connectors RED BLK CW ROTATION INCREASES GAIN SPEAKERS WHT + R SHIELD (Microphone) WHT + L BLK CCW ROTATION INCREASES GAIN BLU WHT 1 4 12K 2 3 XLR4 1/8W 5000 OHM BLK RED BLK SHIELD 5000 OHM SHIELD (Speakers) 300623-001 / 300623-002 SHIELD WHT/OVERHEAD Audiocom Compatible SHIELD/OVERHEAD RED + BLK MICROPHONE WHT BLU – NC SHIELD SHIELD SPECIFICATIONS Receivers: Type: Dynamic Frequency Response: 350 Hz - 3.0 kHz ±6 dB (150 S at max.