Kenwood SP-230 specifications USE of Filters, Installation of Extension Feet, 123

USING COMBINED FILTERS

1.When both LOW and HIGH 1 filters are engaged, the pass bandwidth ranges.from 500 Hz to 3 kHz.

2.When both LOW and HIGH 2 filters are engaged, band- width is 500 Hz to 1.5 kHz.

3.LOW' HIGH 1 and HIGH 2 filters engaged, 500 Hz to 1 kHz.

500Hz 1 kHz 1.5kHz 3kHz

LOW HIGH 1. 2 HIGH 2 HIGH 1

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8"

123

REAR PANEL

1, 2 INPUT connectors

Accepts aud io output from two sources.

3LINE OUT Connector

Standard line output through the filters for RTTY. SSTV, or similar use.

LOW

N

.;

L-_f-+..J	r-------+--+--~		~ SP!~E.
		NPUT
	.D.AIs4l
	=B	L.::.J
.- B (Oot--j-I	rf'ILTERSI
	LOW HIGH I	HIGH2
LA (Oot---'	E1GEI
INPUT

-PUSH ON-

USE OF FILTERS

In general, it is desired that a CW, AM, or similar trans- mission be received clearly within the usual communica- tion audio bandwidth, 300 Hz - 3 kHz. However. QRM, QRN or RFI may lower the overall signal-to-noise ratio at the receiver, resulting in degraded reception. In theory, as the pass-band width of the IF stages is narrowed, the equi- valent noise bandwidth will also narrow, thus improving the signal-to-noise ratio. Alternately, the bandwidth of the AF stage can be narrowed to attenuate the noise com- ponent, enhancing reception.

Proper filter selection depends on transmission mode and type of noise encountered.

1.SSB: use the HIGH 1 and LOW filters, or the HIGH 2 and LOW filters. In more severe cases, use both HIGH 1 + HIGH 2, and LOW filters.

2.CW: use the HIGH 1 and HIGH 2 filters or HIGH 1 + HIGH 2 and LOW in combination.

INSTALLATION OF EXTENSION FEET

To install the extension feet, screw to the front, bottom of the cabinet as illustrated below.

~Extension foot

kSCreW(M4)

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