Clear-Com HB-704 - Manual (Page 9)

H B - 7 0 2 / H B - 7 0 4 T W O - A N D F O U R - C H A N N E L 1 - 3
• LATCHING: Press and release the button quickly to latch the talk
function. Press and release the button again to turn off the talk
function.
• TALK INDICATION: The talk button lights amber when the talk
function is active. When the talk function is not active, but the station
is receiving electrical power, the button lights blue.
2. Call button and light: Pressing the call button will send a call signal on
the selected channel. All the call lights on that channel will then flash.
Call signals can also be sent while talking if required. The call light will
light red while the call button is pressed, or whenever a call signal is
present on the selected channel.
3. Volume control: Turn this control to set the volume required on the
headset.
4. Sidetone control: Sidetone is the level of the operator’s voice that is
heard while talking on the intercom. Setting a comfortable level of
sidetone will ensure that the intercom line sounds alive and also helps
modulate the operator’s voice relative to other voices on the line. Use the
following procedure to correctly set the sidetone level control.
1. Set the volume control to a comfortable level by having someone talk
to the operator from another station.
2. Press the talk button and speak into the microphone while turning the
sidetone control slowly back and forth until you hear your voice at a
comfortable level in the headset.
Note: Do not force the trimpot past its stop points. This will damage it.
5. Channel switch: This switch selects the intercom channel (A, B, C, or D)
on which the headset station is active.
6. Headset connector: The headset connector is located on the front panel.
All Clear-Com headsets are recommended for use with the HB-702 or
HB-704. The Clear-Com PT-7 push-to-talk microphone or the HS-6
telephone handset will also plug into the headset connector. The
following is a description of the characteristics of a suitable headset:
Mic Type --- Dynamic; see technical specifications for details
Headphone --- Dynamic; see technical specifications for details. The wir-
ing of the headset is to be as follows:
Pin 1 --- microphone ground (shield)
Pin 2 --- microphone hot
Pin 3 --- headphone ground
Pin 4 --- headphone hot
The microphone and headphone wiring in the headset cord must be indi-
vidually shielded. Do not connect pins #1 and #3 together. Headset
extension cords or headset “Y” cables are not recommended because they
may increase crosstalk between channels.