Sigma Gold TDP-52-SN3 Manuale Di Servizio

27.1.1999 

8HDS50GB_fm5.f

38

Product: HDS-50 (Ext. Handset With Cradle) /      

The hook operation is done by use of a reed switch. Hook operation is connected to 
the handset earphone terminal.

The operation is as follows:

1

ERP

earphone input, HOOK state

2

GND

ground

3

GND

ground

4

MIC

microphone output

Sensitivity:

-43 dB ± 6 dB

Vendor and part no:

Hosiden KUC2023 or KUB2023

RF decoupling capacitor:

33 pF; Size: 0805; Mounted on the microphone 
element.

Sensitivity

95 dB ± 5 dB

Vendor and part no:

Hosiden KDR0928-IE-0030

Impedance:

min 120 ohm

Resistance (DC):

max 3 kohm

ON_HOOK

HIGH DC IMPEDANCE (SWITCH OPEN)

OFF_HOOK

LOW DC IMPEDANCE (SWITCH CLOSED), 2.2 KOHM RESIS-
TANCE