Operation - SEA 222 Operator's Manual

1.4.3 RECEIVER
Sensitivity: SSS
Selectivity: SSS
AGC
Intermodulation
Spurious Responses
Audio Power
2. OPERATION
2.1 WARM-UP CAUTION
1 microvolt-for 12 dB SINAD
300 Hz to 2400 Hz
±
6 dB
Less than 10 dB audio level change from
10 uV to 100 mV, fast attack slow release
At least
-80
dB
At ·1east -60 dB
4 Watts at less that 10% distortion
Do not attempt to transmit until the radiotelephone is warmed up
for at least 3 minutes. Transmitting before the 3 minute warm-up
period has elapsed can cause a violation of FCC regulations.
2.2 FCC REQUIREMENTS
"How to Correctly Operate Your Radiotelephone Set" is a booklet
available from the Radio Technical Commission for Marine Service
( RTCM), P.O. Box
19087,
Washington, D .C. 20036 and is highly recom-
mended reading material.
2.3 FRONT PANEL CONTROLS AND INDICATORS
Figure 2.3 illustrates the front panel of the SEA 222. The function
of these controls is as follows:
Volume ON/OFF : This control adjusts the loudness of the receiver
and turns the set on and off. To turn the set ON, turn the Volume
ON/OFF control knob CLOCKWISE until a click is heard. Turning the
control knob further clockwise will increase the receiver volume
level.
TRANS Inaicator: This LEIJ indicates (when lit) that the transmitter
is activated. Under zero modulation conditions, the LED is dim,
brighteniny under modulation to indicate proper voice output.