Philips SPENDEX 40 Maintenance Manual page 43
Speech encryption decryption equipment
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Also See for SPENDEX 40:
- Operating manual (25 pages) ,
- Operating instructions manual (21 pages)
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NATO CONFIDENTIAL
SPENDEX 40 UA 8251/00 AND /Ol
5 . 1 3 . 4 S e t t i n g b l o c k S 4
LIMITED MAINTENANCE MANUAL
By means of a jumper on setting block S4 the equaliser of the
internal modem can be switched permanently on or off. When the jumper
is not inserted, the equaliser is switched on or off by the comsec
c o n t r o l l e r.
■
Option
Position of jumper
Equaliser permanently switched off
Equaliser permanently switched on
Switch on/off equaliser via comsec
c o n t r o l l e r
1-2
2-3
not inserted
5 . 1 3 . 5 A d j u s t m e n t o f t h e t r a n s m i s s i o n l e v e l
With the aid of the potentiometers R18 and R19 the transmission level
can be accurately adjusted. R19 is used for adjusting the level with
the internal modem off line (level microphone signal/dialling tones,
factory setting -15 dB) and R18 for adjusting the level with the
internal modem on line (level modem signal, factory setting -19 dB
with equipment type UA 8251/00 and -12 dB with equipment type
UA 8251/01).
With potentiometer Rll the hybrid has been adjusted on a minimum
value in 2-wire operation.
5 . 1 4 U p p e r c o v e r
None
5.15
Cradle
None
5 . 1 6 M a i n s / l i n e fi l t e r
None
9922 154 13431
5-7
NATO CONFIDENTIAL
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