JK Audio Universal Host - Manual (Page 8)

8
Operation
(continued)
Telephone Handset
Universal Host will disable the microphone in the telephone hand-
set when you press the Broadcast button. Use your telephone to
place or screen a call. When you are ready to take the call on
Universal Host, simply press the Broadcast button. Universal Host
will automatically release the Hold (if Hold is used). Make sure
you do not put the telephone handset back in it's cradle while
you are on a call.
This will still drop the call. Do not disconnect
or remove the handset during your call
as this will change the
input impedance from the phone line and change the audio level.
To take the call back on your telephone, press the Handset button
on Universal Host. This will disable the Universal Host and
reconnect your handset to the telephone. Your telephone will
operate as a normal telephone anytime you are in Handset mode.
Leaving the hybrid connected to the handset jack on your
telephone will not affect normal use of your telephone. Audio will
only pass through the hybrid when you press the Broadcast button.
Optional Jumper Settings
There is a jumper located inside the Universal Host at J9 that
affects handset operation. The factory default closed position
(jumper covering both pins) disables only the handset microphone
when the Broadcast button is pressed. Changing the jumper to the
open position (either remove the jumper or cover just one pin)
allows you to completely disable both the handset microphone and
the speaker when the Broadcast button is pressed.
If the incoming audio level from your telephone is too high and you
are consistently lighting the red -3dB Receive LED, first try
decreasing the volume using the controls on the base of your
telephone. If you still cannot drop the incoming audio level enough,
you may need to change jumper J10 inside Universal Host. There
are three possible settings to adjust Caller receive level:
Pins 1 & 2 closed = 0 dB (factory default)
Pins 2 & 3 closed = -10 dB
Pins 1-3 left open = -20 dB
To change the jumper settings, first disconnect power from the
Universal Host, then remove the four screws on the bottom that
hold the cover on. Slide the top cover up to remove it and locate
the appropriate jumpers on the printed circuit board.