ETS STW3-HSM8 Instructions

STW3-HSM8 Two Way Monitoring Kit Instructions
The STW3-HSM8 is a single zone 2-way Audio Surveillance System for use with all ETS HSM8 series microphone /
speakers. It can be used independently for monitoring live audio or with tape recorders for recording and playback.
HSM8 Mounting
Locate the HSM8 Microphone/Speaker near the area of interest. Do not mount the HSM8 near air conditioning vents, light
fixtures or electrical equipment. Try to keep the distance between the HSM8 and the STW2 under 500 feet.
Cable Run
For the Microphone, run a 22 gauge, 2 conductor shielded cable (1,000 feet maximum length) between the HSM8 and the
STW2 base station. Keep the cable away from AC power sources, light fixtures and electrical equipment.
For the Speaker, run a 22 gauge, 2 conductor shielded cable (1,000 feet maximum length) between the HSM8 and the
STW2. For the optional Call Switch, a 22 gauge, 2 conductor cable can be used. This is a contact closure type of
connection so it doesn't matter which side goes where,
Adjusting the HSM8 Microphone Gain
Remove The windscreen from the front of the HSM8 microphone to adjust the microphone volume. It is shipped from the
factory at midrange. If the volume at the head end is low adjust the trimmer clockwise and counter clockwise to lower it.
You will need a small flat bladed or Philips screwdriver to make the adjustment.
Setting the HSM8 Hi-Cut/Lo-Cut Switches
The normal frequency response of the SM1 microphone is 350-12Khz. When both switched "in", The "HI Cut" and "Lo
Cut" filters set the HSM8's frequency response to 700-7Khz . Enabling one or both of the filters is useful when background
noise needs to be further reduced and intelligibility of speech emphasized. We recommend experimenting with the switch
settings to achieve the best acoustic result for your application.
STW2 Base Station Controls
After connections have been made, apply power to the unit and the system is ready to use. You should hear HSM8 audio
on the STW2 base station Speaker. Adjust the "Volume" knob to a comfortable level.
Sending a message to the HSM8
Press and hold the "Push To Talk" button on the base station, and a green light will come on, indicating that audio is being
sent to the HSM8. Speak in the direction of the Microphone, then release the button after you have finished your
message. The green light will go out. If necessary, you can adjust the Speaker volume by turning the "Remote Volume"
know clockwise for louder sound and counter clockwise for softer sound.
Recorder Switch
If the STW3-HSM8 kit will be used with a recorder of some type, place the recorder switch in the "IN" position. In this
position, both live audio and playback audio can be heard through the STW2's internal speaker. Connect the "Audio Out"
jack to the recording device's "Audio In", using the supplied RCA cables. Connect the "Audio In" jack to the recording
device's "Audio Out." In stand alone applications where there is no recorder or no need to playback recordings, place the
recorder switch in the "OUT" position. Note-both sides of conversations will be recorded.
Headphones
Plug headphones into the "Headphone" jack on the front panel of the STW2. Audio will be cut out on the STW2 Speaker.
Optional Call Switch
If you have the "Call Switch" option, simply press the button on the HSM8 to start a 1 HSM8ond tone to the STW2.