Bedienungsanleitung Kenwood TS-870S (Seite 58 von 104) (Englisch)

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AGC AUTO NB

WIDTH

AUTO NOTCH (SSB)

Auto Notch automatically locates and attenuates

interfering tones within the receive pass band. This

function operates digitally at the IF level, hence it can

affect your S-meter reading, and may affect (slightly

attenuate) your desired signal. If interfering tones are

weak, you may find that Beat Cancel eliminates them

more effectively. Also, Auto Notch may not notch out

signals inside the pass band if signals just outside the

pass band limits are stronger.

After switching ON the function, selecting a mode other

than SSB will switch OFF the Auto Notch function (LED

goes out). Changing back to SSB re-activates the

function automatically (LED lights). If strong, steady

interference is present, switching Menu No. 18 (TRACK)

to OFF may improve the notching capability. To block

CW interference, switch TRACK to ON, then switch

TRACK to OFF to lock the adaptive filter.

Press [AUTO NOTCH] to toggle the Auto Notch function

ON or OFF.

• The LED indicator in the button lights when the

function is ON.

Note:

The effect of Auto Notch may differ under different receiving

conditions even when using the same response time.

BEAT CANCEL (SSB/AM)

Beat Cancel also attenuates unwanted tones within the

pass band, but it is more capable than Auto Notch at

removing low-level tones. Also, this function works at the

AF level, therefore you will notice there is no S-meter

signal loss, although the S/N ratio may be lowered in the

AM mode.

After switching ON the function, selecting a mode other

than SSB or AM will switch OFF the Beat Cancel

function (LED goes out). Changing back to SSB or AM

re-activates the function automatically (LED lights).

Press [BEAT CANCEL] to toggle the Beat Cancel

function ON or OFF.

• The LED indicator in the button lights when the

function is ON.

Note:

The effect of Beat Cancel may differ under different receiving

conditions even when using the same response time.

CHANGING RECEIVE BANDWIDTH

(CW/FSK/FM)

The width of the receive pass band can be changed

without altering the current receive frequency. Change

the bandwidth by adjusting the LO/WIDTH control.

When the control is adjusted, “WIDTH” and the newly

selected bandwidth appear on the Display.

ADAPTIVE FILTERS

The Auto Notch, Beat Cancel, and Noise Reduction

functions accomplish their design purposes by

modifying the characteristics of adaptive filters.

Adaptive filters adapt or change their characteristics

according to the nature of the signal being received at a

given moment. Menu No. 18 (TRACK) determines

whether the adaptive filters are allowed to change in this

manner or not.

It is also possible to specify how long the received

signals will be monitored before determining filter

characteristics. This monitor period is inversely

proportional to the response time. The longer the

monitor time, the slower the response time and vice

versa. Use Menu No. 14 (LINE.ENH) to select a

different Line Enhance response time, Menu No. 16

(SP.BEAT) for the Beat Cancel response time, and

Menu No. 17 (SP.NOTCH) for the Auto Notch response

time.

The adaptive filters may not function correctly with

signals that have a poor signal-to-noise (S/N) ratio.

Under poor conditions, you may find that optimum

results are obtained by switching OFF the adaptive

filters via Menu No. 18 (TRACK).

Note:

Only Auto Notch, or Beat Cancel, or Noise Reduction can be

used at one time. They cannot be activated at the same time. Also,

Menu No. 18 changes to its default setting when the TS-870S power

is switched OFF and then ON again.

100

200

400

600

1000

250

500

1000

1500

Bandwidth

(kHz)

Bandwidth

(Hz)

FSK

Bandwidth

(Hz)

Default values

8 REJECTING INTERFERENCE

Interfering tone

Notch band

Receive pass

band

Interfering

tones

Receive pass band

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Kenwood TS-870S Seite 58

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