Operation - Icom IC-551D Instruction Manual

stop talking) is controlled by the VOX DELAY control. Turning the control counterclockwise
makes the time shorter. Set it at a position which is comfortable and which allows for short
pauses in normal speech.
Adjust the ANTI VOX control so that the VOX circuit is not activated by sounds from the
speaker by turning the control clockwise while receiving a signal.
CW OPERATION
1. RECEIVING
For CW reception, set the MODE Select Switch to the CW position. Oher switches and knobs
are set the same as for SSB reception.
Rotate the tuning knob until ап 800Hz (арргох.) beat tone is heard from the speaker or head
phones. Set the noise blanker switch and/or the AGC switch for clear reception, the same as
for SSB reception.
The receiving pass band will be adjustable continuously to 500Hz/—6dB by turning the P.B.
TUNE CONTROL. This is very effective in reducing interference the same as for SSB
reception.
'TRANSMITTING
Insert the keyer plug into the KEY Jack on the rear panel of the unit, and set knobs and
switches the same as for CW reception.
By setting the T/R switch to Transmit, the transmit LED is lit and shows that you are ready
for CW transmission. When you key the keyer, the meter needle moves and your CW signal is
transmitted.
To decrease the transmitting power, turn the RF POWER Control clockwise beyond the
"click" to ON and rotate to adjust while watching the meter needle on the Multi-function
Meter for the desired output power.
см MONITOR
When keying, the side tone oscillator circuit is activated and an 800Hz tone is heard from the
speaker. The loudness of this tone is adjusted by rotating the CW MONI Control, located
under the access cover. Rotating the CW MONI Control clockwise makes the tone louder.
(In the receive mode, this side tone is audible and can therefore be used for Morse Code
Practice, adjustment of the keyer, etc.) To receive again, place the T/R switch in the receive
position.
SEMI BREAK-IN OPERATION
The 1С-5510 has Semi-Break-In CW capability. When keying, the unit is automatically set in
the transmit mode. After keying, it is returned to the receive mode, also automatically, after
a given transmit-release delay time constant. Leave the T/R switch in the Receive position,
and set the VOX switch in the ON (down) position.
The transmit release delay time constant is set by adjusting the VOX DELAY Control located
under the access cover. Turning the VOX DELAY Control clockwise will make the transmit
release time longer. Set for your keying speed.
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