Realistic DX-440 warranty DIBmJ

SPECIAL SSB/CW RECEPTION TECHNIQUES

Many stations transmit unmodulated telegraph transmissions in the shortwave

band. To receive these special Morse code characters, the radio uses a special circuit, a beat-frequency oscill - ator, to modify the transmitted signal so that you can hear it. This particular type of telegraph transmission is called Con- tinuous wave (CW) transmission.

Many stations transmit voice signals with a suppressed carrier in the single side band.(SSB),part of the radio trans- mission spectrum that lies to the side of the primary frequency signal. Amat- eurs tend who transmit voice below 10 MHz use the lower side band (LSB).

Above 10 MHz, they use the upper side band (USB). Commercial utility stations generally use the USB. A carrier has to be added to make these signals audible.

4. Rotate the BFO PITCH control to the
midpoint.	BFO PITCH	RF GAIN
	'"
	00USB MIN
5. Rotate the RF GAIN control to the		RF GAIN
MAX position	BFO PITCH

			BFO HTCH	RF GAIN
TO RECIEVE CW			00use M,.. ..~x
1.	Turn on the radio.			POWER
			i'
		MINI I I I I I I I [		I IMAX VOLUME
		~
2.	Extend the antenna fUlly straight up.

3. Set the BFO switch to IN.

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MONO STEREO BFO LOCK

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WIDE NARROW OUT"*'IN OUT iN

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6. Press the AM band button to select
the AM band.	FM AM LW MW SW
	00000
	i'
7. Tune in the CW station using the
tuning knob, or enter the frequency	LIIIIIIIIIIIR	BALANCE
using the direct access buttons.	~
	LOIIIIIIIIIIIHI	TREBLE
	~
			i'
	ODD456
	CJ CJ CJ
	7	8	9
	CJ CJ CJ
	O/SEC	EXECUTE
	CJ (		1

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