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igtronics 

®

S

igtronics 

®

S

…when it counts!

 Sigtronics  Corporation 
178 East Arrow Highway 
San Dimas, CA   91773 
Phone: 909 305-9399 
E-mail: [email protected] 
Web Site: www.sigtronics.com

Model ST-11

Headset Instructions

The ST-11 series headset is adjusted at the factory for immediate use with all 

Sigtronics emergency apparatus intercoms and radio adapters in emergency 

vehicles. The headset is equipped with a single plug and a coiled cord.

The head strap is adjustable so you may custom fit the headset. Place the headset 

on your head and adjust the strap until minimum pressure is felt at the back of 

your head.

The microphone boom is adjustable and is designed for use on the left side of 

the head. Make sure you are speaking into the side of the microphone marked 

with the arrow (see diagram) or substantial loss of gain will occur. Microphone 

placement should be at the corner of the mouth, approximately ¼” from the lips.

Caution: Do Not immerse any part of the headset in water or any other liquid. Be 

especially careful not to allow the microphone to become wet! Exposure to moisture 

may cause internal corrosion and failure and will void your manufacturers warranty.

WINDSCREEN

The microphone windscreen will reduce annoying wind noise and breath pops 

picked up by headset microphones. It also protects the microphone element 

from dirt and moisture. The windscreen should be washed regularly to maintain 

hygiene and avoid clogging. Wash in warm water and mild soap. Rinse thoroughly 

and make sure it is completely dry before putting it back on.

To remove the windscreen, carefully grasp the windscreen lightly along its entire 

length and remove from the microphone element being careful not to twist the 

element itself.

Put the windscreen on the microphone by gently pulling from the open end. Do 

not pull it so tightly that it stretches against the end of the microphone.

WARRANTY

Your headset is covered by a limited two-year parts and labor warranty. Please see 

the enclosed warranty card for details.

You may refer to the parts list on the reverse side, if you choose to replace parts 

yourself. The parts list describes parts for this particular headset only. Parts lists 

for other models are available on our Web Site or can be obtained by contacting 

Sigtronics Corporation.

TALK

Arrow

Microphone Boom

Windscreen

Microphone

10-12-2021     st-11.pdf

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