KSI-W016-000

5

Information On Muting Characteristics (continued)

Since the pin6 is connected to the base of the emitter ground

transistor through a protection resistor of 500Ω in series as shown

Fig.2. the voltage between pin6 and ground is about 0.7V when

the control current is applied. Actually, the muting operation is

accomplished by applying a muting drive output voltage(pin14) to

the pin6 through a high resistance(20kΩ )

The muting drive output is composed of three output devices:

①

Hole Detector output which develops a voltage when C/N

(carrier-to-noise ratio) is lower than weak signal input conditions.

②

A reversed output of the signal meter drive output.

③

A bandwidth limited muting drive output which develops a

tuning-off operation. All these output are led to an OR circuit and

the output is developed at pin14.

The inverted output of the signal meter drive output is obtained as shown Fig. 3.

4.1V(Typ.) for medium or lower signal input levels where the muting drive output is

increase the slope of the curve.

SL1018

500

500

6

- Fig. 2-

16

15

14

Vc c

Vr

In v e r t e r

In v e r t e r

In v e r t e r

Si g n a l

Me t e r

Ou t p u t

AGC

Ou t p u t

Mu t i n g

De t ect o r

Ou t p u t

-Fig. 3-