SL1018 Datasheet, PDF (6/9 Pages) AUK corp – FM IF SYSTEM

SL1018
Information On Muting Characteristics (continued)
Furthermore, varying the value of a resistor connected between the pin14 and pin16
changes the value of the muting control current required to obtain the same muting drive
output, accordingly a slope of curve for muting attenuation vs. antenna signal input level is
also changed. Fig. 4 shows these characteristics investigated by using an actual receiver.
The method to adjust the muting circuit is to set the signal input level required to actuate
the muting circuit with the R₁₆ , to adjust the slope of the curve for the muting attenuations
vs. antenna signal input with the R₁₅ and to adjust the maximum muting attenuation
determined by setting the noise level at no signal.
The slope of the curve for the muting attenuation vs. antenna signal input level can also be
adjusted by the resistor connected between the pin14 and the pin6. However, if the resistor
is too high, the muting control current does not flow into pin6 over than 120 ㎂ even
though the maximum muting drive output(V₁₄) is applied, namely the muting attenuation
doesn't reach its maximum value. A recommended value of the resistor between the pin14
and the pin6 is about 22kΩ.
5
V 15
4
3
2
1
V 14
V 16
0
A NT In pu t
- F^-Fiⁱg^g..⁴4^- -
KSI-W016-000
6