8 REJECTING INTERFERENCE

NOISE REDUCTION (SSB/CW/FSK/AM)

contest-type conditions, on an extremely crowded band,

Menu No. 13 (LINE.ENH) determines whether the Line

or when propagation is at a peak and all signals are

local quality.

Enhance function (an adaptive filter) or the SPAC filter is

¥

 

Press [AIP] to toggle the AIP function ON or OFF.

used. When using the Line Enhance function, switch

 

 

 

 

 

 

Menu No. 18 (TRACK) to ON. The SPAC filter works

¥

 

ÒAIPÓ lights when the function is ON.

better for reducing noise and is effective for eliminating

 

 

 

 

 

various types of noise. However, audio quality will

 

 

 

 

 

deteriorate since only the audio portion is selected. This

 

 

 

 

 

filter may induce pulse noises. One difference between

 

 

 

 

AIP AGC AUTO

the digital Line Enhance function and the conventional

 

 

 

 

 

 

 

 

 

 

analog-based Noise Blanker is that the digital function

 

 

 

 

CW

works at audio frequencies whereas the blanker acts at

 

 

 

 

 

 

 

 

 

 

IF.

¥

 

By default, AIP switches ON for all frequencies

Press [N.R.] to toggle the Noise Reduction function ON

 

 

 

below 7490 kHz. However, the status of AIP is

or OFF.

 

 

stored independently for each AIP band. When a

¥ The LED indicator in the button lights when the

 

 

different AIP band is selected, the last setting

 

 

(OFF/ON) used on that band is recalled.

function is ON.

 

 

 

 

 

 

 

¥ When the S/N ratio is reasonably good in SSB, using

Note: If you are concerned about precise S-meter readings, switch

ON Menu No. 11 (AIP.GAIN) when using this function. AIP.GAIN

Line Enhance will improve the S/N further. When

does not change the S-meter sensitivity but, due to the increased

receiving a CW signal with a poor S/N ratio, using

gain, the noise level increases even while receiving no signals.

SPAC will improve the S/N. For AM signals,

AIP.GAIN does not work in FM or AM.

received audio may become intermittent.

SETTING SPAC TIME

SPAC is a DSP term that literally means Speech Processing using Automatic Correlation. This is one method of digitally filtering out noise. Using Menu No. 15 (SPAC), select the correlation time that provides the highest quality reception for SSB. When receiving CW, choose the longest time that allows reliable reception. The longer the correlation time, the better the S/N .

NOISE BLANKER

The Noise Blanker was designed to reduce pulse noise such as that generated by automobile ignitions.

Press [NB] to toggle the Noise Blanker ON or OFF. To change the level of blanking, adjust the NB control. Always use the minimum necessary blanking. This reduces the chances of blanking your desired signal.

¥ÒNBÓ lights when the function is ON.

AGC AUTO

NB

 

WIDTH

USB

¥When receiving a strong signal while the Noise Blanker is ON, receive audio may sound distorted. Eliminate the distortion by reducing the Noise Blanker level, or by switching OFF the function.

AIP (ADVANCED INTERCEPT POINT)

AIP helps eliminate interference and reduce audio distortion that is sometimes caused by the presence of strong signals. AIP is especially useful during

ATTENUATOR

The Attenuator prevents distortion by reducing the level of the receive signal. The function is also useful to reduce interference from adjacent frequencies.

Press ATT [DOWN] or ATT [UP] to select the desired attenuation.

¥The selected attenuation (units of dB) lights (ÒÐ ATT Ð 6Ó, ÒÐ ATT Ð 12Ó, or ÒÐ ATT Ð 18Ó).

AGC AUTO

LSB

¥The status of ATT is stored independently for each ATT band. When the ATT band is changed, the last setting used on the band is recalled.

Band

Frequency Range

Default AIP

Default ATT

No.

(MHz)

Setting

Setting

1

Lowest freq. ~ 2.49

ON

OFF

 

 

 

 

 

2

2.49

~ 4.49

ON

OFF

 

 

 

 

 

3

4.49

~ 7.49

ON

OFF

4

7.49 ~ 10.49

OFF

OFF

5

10.49 ~ 14.49

OFF

OFF

6

14.49

~ 20.99

OFF

OFF

7

20.99

~ 21.99

OFF

OFF

 

 

 

 

 

8

21.99

~ 25.49

OFF

OFF

 

 

 

 

9

25.49 ~ 30

OFF

OFF

Note: The lower limit is inside the band in each case; the higher limit is inside the next higher band. For example, 4.49 MHz is in Band 3 whereas 7.49 MHz is in Band 4 (exception: 30 MHz is in Band 9).

53

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Image 59
Kenwood TS-870S Noise Blanker, AIP Advanced Intercept Point, Attenuator, Noise Reduction SSB/CW/FSK/AM, Setting Spac Time

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.