OPERATING AIDS

RECEIVING

RIT (RECEIVE INCREMENTAL TUNING)

RIT provides the ability to change your receive frequency by ±9.99 kHz in steps of 10 Hz without changing your transmit frequency. If the Fine Tuning ([FINE]) function is ON, the step size is 1 Hz. RIT works equally well with all modulation modes and while using VFO mode or Memory Recall mode.

It’s a good habit to switch OFF the RIT function after a contact is finished. This returns the receive frequency to the transmit frequency. It ensures that you don’t listen by mistake on a different frequency from your transmit frequency on the next contact. When using Memory Recall mode, RIT only functions with a memory channel containing stored data. Since an empty channel contains no receive frequency, RIT cannot function.

1Press [RIT].

• “RIT” and the RIT frequency display appear.

AGC AUTO

SPLIT

 

RIT

USB

2Press [CLEAR] to reset, if required, the RIT offset to 0.

3Turn the RIT/XIT control to change your receive frequency.

AGC AUTO

SPLIT

 

RIT

USB

4To cancel the RIT function, press [RIT].

Note: The frequency shift set by the RIT/XIT control is also used by the XIT function.

AGC (AUTOMATIC GAIN CONTROL)

The AGC function selects the time constant for the automatic gain control circuit. Selecting a slow time constant will cause the receiver gain and S-meter readings to react slowly to large input changes. A fast time constant causes the receiver gain and the S-meter to react quickly to changes in the input signal. A fast AGC setting is particularly useful in the following situations:

•Tuning rapidly

•Receiving weak signals

•Receiving high-speed CW

The TS-870S will take charge of setting the AGC, using independent release times that you specify for each mode. Or, you can have total control by manually adjusting the AGC yourself from the Front Panel. When receiving strong signals in AM mode with the AGC OFF, the clipping action will make reception difficult or impossible.

To select whether you want Automatic or Manual control, use Menu No. 01 (AUT/MAN). Select OFF for Manual control and ON for Automatic control. The default is Manual (OFF).

■Changing AGC

Automatic (Menu No. 01 (AUT/MAN) is ON):

The following Menu items are available to change the AGC release time in Automatic mode:

Mode

Menu No.

Selections

Default

 

 

 

 

SSB

02

OFF, 1 ~ 20

7

CW

03

OFF, 1 ~ 20

12

FSK

04

OFF, 1 ~ 20

14

AM

05

OFF, 1 ~ 20

5

 

 

 

 

Manual (Menu No. 01 (AUT/MAN) is OFF):

With Menu No. 01 (AUT/MAN) set to OFF, adjust the AGC control to set the AGC release time as you prefer.

•Turning the control clockwise selects a faster release time and counterclockwise selects a slower release time.

•To switch OFF the AGC completely, turn the AGC control fully counterclockwise.

■Changing AF AGC

The TS-870S offers further control of your receiver AGC for the FM and AM modes. For these two modes, you may adjust the AGC release time and level in the AF stage.

Function

Menu No.

Selections

Default

 

 

 

 

AF AGC

06

0: Slow

1: Med

Release

 

1: Med

 

Time

 

2: Fast

 

AF AGC

07

0: OFF

1: Min

Level

 

1: Min

 

 

 

2: Med

 

 

 

3: High

 

 

 

4: Max

 

 

 

 

 

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Kenwood TS-870S instruction manual Operating Aids, Receiving, RIT Receive Incremental Tuning, AGC Automatic Gain Control
Page 49 Page 51

TS-870S specifications

The Kenwood TS-870S is a distinguished transceiver that stands out in the world of amateur radio, particularly for enthusiasts who seek a blend of advanced technology and user-friendly features. Introduced in the early 1990s, this HF transceiver quickly gained a reputation for its exceptional performance, versatility, and reliability, making it a favorite among operators worldwide.

One of the most noteworthy features of the TS-870S is its direct-sampling technology, which allows for superior signal fidelity and processing. This technology enables the transceiver to operate across a range of 160 meters to 10 meters, catering to both casual and serious operators. Its high-performance 16-bit digital signal processing (DSP) facilitates effective noise reduction and filtering capabilities, enhancing the overall clarity during transmission and reception.

In terms of power, the TS-870S boasts an output of 100 watts, providing ample power for various communication needs. The transceiver is equipped with an automatic antenna tuner, which simplifies the task of matching the antenna to the operating frequency, ensuring optimal performance without the hassle of manual adjustments.

Another significant aspect of the Kenwood TS-870S is its user interface, featuring a large, easy-to-read display, and a logically arranged control layout. This makes it accessible for both novice and experienced operators. The built-in memories allow for quick storage and access to favorite frequencies and settings, enhancing operational efficiency.

The Kenwood TS-870S also includes various advanced features such as an optional 2.4 kHz and 6 kHz roofing filter which provides improved performance in crowded band conditions. The receiver's dual VFOs (Variable Frequency Oscillators) enable simultaneous monitoring of two frequencies, which is particularly useful for operators who need to keep track of multiple signals or engage in cross-band communication.

Apart from its technical specifications, the TS-870S is constructed with durability in mind, ensuring that it can withstand the rigors of frequent use. It supports various operating modes, including SSB, CW, AM, and FM, making it a versatile choice for diverse amateur radio activities.

In conclusion, the Kenwood TS-870S combines advanced technology with user-friendly characteristics, offering amateur radio operators an exceptional tool for communication. With its innovative features, robust performance, and flexibility, it continues to be a respected choice among radio enthusiasts, solidifying its legacy in the realm of amateur radio.
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