9
Operation
(continued)
Send Signal Level
The Send LEDs display the signal level as it goes out to the phone
line. The goal is to drive the phone line at high enough levels to be
heard well at the other end, but not so loud as to cause excessive
clipping. Adjust the Send level control so that you occasionally see
flashes of the red -3dB peak Send LED. If the red LED stays lit for
extended periods you should decrease the Send volume control for
the input that is causing the clipping.
Caller Signal Level
The Receive LEDs only display the strength of the signal coming in
from the phone line. The Caller level control does not change what
you see on these LEDs. Adjust the Caller level for the best signal
at the output jacks of Universal Host.
A-B-C Selector Switch
Use this switch to select the correct type of handset microphone
your telephone uses. A=Electret, B=Carbon, C=Dynamic. Trial and
error seems to work best in determining which handset type to use.
Your Universal Host will only function correctly if the handset type
selector switch is in the correct position. This switch changes
signal level, impedance, and wiring to accommodate the
differences in handset microphone types.
Although not conclusive, the following guidelines may help:
Many AT&T
®
, SW Bell
®
and Sony
®
telephones have electret type
microphones and will use the "A" position.
Only older telephones that have the round "screw on" type
handsets contain carbon microphones and use the "B" position.
Many Radio Shack
®
, Panasonic
®
, Nortel
®
and some newer AT&T
®
phones have dynamic microphone types and use the "C" position.
USB Connector
Using the cable provided, you can connect this USB port to your
computer or other audio device. This will enable you to send stereo
audio to your computer or other recording device with your local
audio on the left channel and the caller on the right. You can also
use the USB port to play audio from your computer to the phone
caller, but it will not be sent to the Caller XLR output jack. It will be
mixed with your Send audio on the stereo mini output. You can
send and receive audio at the same time through the USB port.
