Kenwood TS-870S Operating Aids Speech Processor SSB/AM, Changing Frequency While Transmitting

7 OPERATING AIDS

SPEECH PROCESSOR (SSB/AM)

The speech processor functions by leveling the large fluctuations in your voice when you speak. This leveling action effectively raises the average transmit output power resulting in a more understandable signal when operating using SSB or AM. You will notice that using the speech processor makes it easier to be heard by distant stations.

1Select SSB or AM mode.

2Select the preferred processor characteristics via Menu No. 25 (PROC.LOW) and Menu No. 26 (PROC.HI).

•You can customize the low and high ranges of the speech envelope from –6 to +6 dB.

dB +6	Lower	Raise
+3	Low	High
0
	range	range
-3
-6	800 Hz	1.6 kHz

3Press [PROC] to switch ON the processor.

• “PROC” lights.

AGC AUTO PROC

USB

4Press [METER] to select the COMP function.

5While speaking at your normal voice level, adjust the PROC control for a level of 10 dB or less.

•Using higher compression will not improve your signal clarity or apparent signal strength. Excessively compressed signals are more difficult to understand due to distortion and are less pleasant to hear than signals with less compression.

PROC MONI

46

S

40

60 dB

VOX

FULL

SEMI AIP

AGC

AUTO

PROC

ATT

PWR

100

W

M.CH

ANT

DOWN

UP

2

8

dB

AUTO

LSB

USB CW

R

FSK FM

VOX

FULL/SEMI

AIP

HF TRANSCEIVER

TS-870

ON AIR

AT

AT TUNE

THRU/AUTO

METER

PROC

MONI

1

CH 1

6

M.IN

SEND

AGC

KEY SPEED

PROC

MONI

ENTER

4

6

2

CH 2

7

M>VFO

0

1 0

PHONES

2

8

3

CH 3

8

SCAN

SLOW

FAST

OFF

0

1 0

4

CH 4

9

CLR

MIC

CAR

DELAY

MIC

PWR

4

6

4

6

5

REC

0

F.LOCK

2

8

2

8

QUICK MEMO

10

20

FINE

0

1 0

0

1 0

COMP

d

M.IN

MR

B

6Press [METER] to select the ALC function.

7The compression level affects the ALC setting for SSB; therefore, while continuing to speak into the microphone, adjust the CAR control for a reading within the ALC zone.

•Keep the meter inside the ALC zone for the cleanest transmit signal and to avoid interfering with other stations on adjacent frequencies.

8Press [METER] to select the COMP function to allow you to monitor the compression while transmitting.

9To switch OFF the processor, press [PROC] again.

•“PROC” goes out.

Note: Input audio that is controlled by the AGC will be clipped. Therefore, when mixing audio with the operator’s voice, lower the MIC gain control as necessary.

CHANGING FREQUENCY WHILE TRANSMITTING

Moving your frequency while transmitting is usually an unwise practice due to the risk of interference to other stations. While transmitting, if you select a frequency outside the transmit frequency range, the transceiver is automatically forced to receive mode. If transmit was selected using the [SEND] key, transmission will not be resumed until you select a frequency inside the transmit frequency range, and you transmit again.

TRANSMIT MONITOR

The Transmit Monitor function allows you to hear your own transmitted signal.

Mode	Transmit Sampling Point
SSB	Unmixed AF
CW	Keyed output from DSP with sidetone OFF
FSK	AF corresponding to the shift and mark/space
AM	Unmixed AF
FM	Unmixed AF

Press [MONI] to toggle the Monitor function ON or OFF.

AGC AUTO MONI

USB

•To change the volume of the monitored audio, adjust the MONI control.

46