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V
oice communications
A
. Set the mode selector to AM, USB, or LSB (if available).
B
. Set the frequency selectors to the desired operating frequency.
C
. Turn receiver - transmitter on. This is done on part no 622-2553-001 by setting
the function selector to TR, on part no 622-2553-002 by setting the function selector
to H PWR or L PWR, and on part no 622-2553-003 by rotating the gain control
clockwise and setting function selector to HI PWR or LO PWR.
D
. Tune the receiver - transmitter by momentarily depressing the ptt key on the
handset or headset. A constant tone will be heard in the handset earpiece during
tuning (7 seconds maximum). After completion of tuning, the tone will cease and
receiver noise will be heard.
NOTE
If the tuning process cannot be completed, an interrupted tone (beeping) will be
heard in the handset.
E
. Adjust the gain control to the desired level of audio. If a clicking sound is heard,
the battery is low and needs recharging.
F
. If the preceding steps are completed with no tune-incomplete indication, voice
transmission may be made. Depress the ptt key on the handset or headset and
proceed. The presence of sidetone is an indication of transmitter output.
CAUTION
Rf burns can result from contact with antenna when transmitting.
NOTE
The lack of sidetone during transmission is an indication that the transmitter is not
functioning properly.
G
. If a new frequency is desired, repeat steps b and d through f.
H. The 377L-2, part no 622-2553-001 has transmit inhibit capability if receive only
operation is desired. To operate in this mode perform steps a through e above to
tune the antenna, then set the function selector to RCV.
C
w communications
Perform the procedure for voice communications except use the telegraph key
instead of the handset or headset ptt key.
D
ata communications
Data communication is possible on 377L-2 part no 622-2558-001 and 622-2553-002.
For this method of operation, connect the modem to one of the audio connectors on
the 377L-2 Receiver - Transmitter Control, set the gain control to 0 dBm 600 (ccw
position), and perform the procedure for voice communications except key the
receiver-transmitter via the modem.
Содержание COLLINS MP-20
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Страница 6: ...6 Figure 3 Accessories Components Sheet 1...
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Страница 22: ...22 Figure 14 377L 2 Receiver Transmitter Control...