Kenwood TS-870S Changing Transmit Bandwidth, Transmit Bandshift, Equalizing Transmit Audio

7 OPERATING AIDS

CUSTOMIZING TRANSMIT SIGNAL CHARACTERISTICS (SSB/AM)

BANDWIDTH/ BANDSHIFT TABLE

The quality of your transmitted signal is important regardless which on-the-air activity you pursue. However, it’s easy to be casual and overlook this fact since you don’t listen to your own signal. The following sub-sections provide information that will help you tailor your transmitted signal.

■Changing Transmit Bandwidth

Transmit bandwidth is modified via Menu No. 29 (TX.WIDTH). The available selections include:

•1800, 2000, 2300, 2600, and 3000 Hz

The default is 2300 Hz. Consult the Bandwidth/ Bandshift Table for additional data. When the Speech Processor is switched ON, the bandwidth changes as shown in this table; however, displayed values do not change.

■Transmit Bandshift

Transmit bandshift is modified via Menu No. 30 (TX.SHIFT). The available selections include:

•0, 100, 200, 300, 400, and 500 Hz

The default is 300 Hz. Consult the Bandwidth/ Bandshift Table for additional data. When the Speech Processor is switched ON, the bandwidth changes as shown in this table; however, displayed values do not change.

■Equalizing Transmit Audio

Press [TX EQ.] to toggle the transmit equalizer ON or OFF. To change transmit frequency characteristics, access Menu No. 31 (TX EQ.). The available selections include:

•High boost (H)

•Comb filter (C)

•Bass boost (B)

The default is High Boost.

■Microphone AGC

While transmitting, Microphone AGC helps to prevent distortion due to overly high audio input. It is disabled while using CW or FSK.

Function	Menu	Selections	Default
	No.
Microphone	22	0: Slow	1: Med
AGC Release		1: Med
Time		2: Fast

Speech Processor

OFF

TX	TX	Resulting
Bandshift	Bandwidth
Setting	Setting	Upper
		Cutoff
(Hz)	(kHz)
		Freq.
(Menu	(Menu
		(kHz)
No. 30)	No. 29)
0	1.8	1.8
	2.0	2.0
	2.3	2.3
	2.6	2.6
	3.0	3.0
100	1.8	1.9
	2.0	2.1
	2.3	2.4
	2.6	2.7
	3.0	3.1
200	1.8	2.0
	2.0	2.2
	2.3	2.5
	2.6	2.8
	3.0	3.2
300	1.8	2.1
	2.0	2.3
	2.3	2.6
	2.6	2.9
	3.0	3.3
400	1.8	2.2
	2.0	2.4
	2.3	2.7
	2.6	3.0
	3.0	3.4
500	1.8	2.3
	2.0	2.5
	2.3	2.8
	2.6	3.1
	3.0	3.5

Speech Processor

ON

	New	New
	Lower	Band-
	Cutoff	width
	Freq.	(kHz)
	(Hz)
200		1.6
		1.8
		2.1
		2.4
		2.6
		1.7
		1.9
		2.2
		2.6
		2.6
		1.8
		2.0
		2.3
		2.6
		2.6
300		1.8
		2.0
		2.3
		2.6
		2.6
400		1.8
		2.0
		2.3
		2.6
		2.6
500		1.8
		2.0
		2.3
		2.6
		2.6

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