RTU-292C Operations Manual
3-5
2.
Connect the RTU-292C to the outside phone line by pressing the TEL LINE/PHONE button;
listen for the dial tone.
3.
When dial tone is heard, dial the desired number using the keypad. The handset will function
like an ordinary telephone handset.
4.
If desired, the phone conversation may also be monitored via the front panel speaker by
depressing the SPEAKER/PHONE switch (SPEAKER/PHONE LED ON). Prevent feedback
by controlling speaker volume and keeping the handset a sufficient distance from the speaker.
5.
To hang up, press the TEL LINE/PHONE button, or the TEL-LINE OFF button, so that the
TEL LINE/PHONE LED goes out.
3.4.4
RECEIVING A TELEPHONE CALL
NOTE
The handset-to-telephone path may be left in the enabled condition
(HANDSET/PHONE LED ON) even when the unit is not connected to the telephone
line. Only one button (TEL LINE/PHONE) must then be pushed to answer the
telephone. The following scenario assumes that the HANDSET/PHONE LED is
already ON.
1.
When the ring is heard (or the flashing TEL LINE/PHONE LED is observed) indicating an
incoming call, push the TEL LINE/PHONE button and speak into the handset. It isn't
necessary to press the handset PTT switch to use the telephone.
2.
To hang up, press the TEL LINE/PHONE button again. The adjacent LED will turn off.
3.4.5
PUTTING A TELEPHONE CALL ON HOLD
Once a telephone call has been received or initiated and the TEL LINE/PHONE LED is
illuminated, pressing the HANDSET/PHONE button or the SPEAKER/PHONE button will put
the call on “hold”. (The call will not be cut off as long as the TEL LINE/PHONE button is not
pressed.)
For example, if the RTU-292C operator has made a telephone connection and wishes to contact
a radio party to continue setting up the patch, he may place the telephone call on “hold” and
speak with the radio party using the handset as described in 3.4.6.
3.4.6
USING THE HANDSET WITH THE RADIO
Pressing the HANDSET/RADIO button will connect the handset to the radio's audio lines
(associated LED will be on). The receive audio will be heard in the earpiece, and when the radio
is keyed (via the handset or front panel key switches) the handset mic audio will be routed to the
transmitter. The SPEAKER/RADIO pushbutton may also be used to monitor radio receive audio
via the RTU-292C's front panel speaker.
3.4.7
CONNECTING THE RADIO TO THE TELEPHONE LINE
To patch the radio to the telephone line, push the TEL LINE/RADIO button to ON. This will
cause the adaptive hybrid to operate in the following manner:
Summary of Contents for RTU-292C
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