high audio quality
ASSA TP 40
low current consumption
long operation time
transponder ASSA-TP-40 uses micropower electronics offering
excellent audio pick-up with low illumination power level.
The ASSA-TP-40 once deploye will operate continously over
12 months on internal battery pack and much longer with external
battery pack. The ASSA-TP-40 monitors perfectly through walls
and is very difficult to detect.
ASSA-TP-40 transponder is activated just prior to deployment
by installing a small wire jumper link so closing a switch
contact within the transponder. The device is now ready for
is normally no appreciable radiation which can be detected
by conventional countermeasure. The complet transponder dormats.
However, on being illuminated by a low level microwave transmission
originating from the ASSA radar and receiver unit, the ASSA-TP-40
superimposes audio intelligence onto the reflected signal.
A special matching receiver within the radar and receiver
unit enables recovery of the audio signal. The ASSA-TP-40
consumes the same amount of power in either dormant or transponding
mode, typically 60 ,uA at 3 V (less then 200 uW).
transponder illumination power required is typically 10 mW
for ranges of 10 metres through one partion wall down to 10
,uW for ranges up to 2 metres through one partion wall. Higher
power levels, up to 100 mW, can be used for greater ranges.
Compact Yagi aerials are used for illumniation and reception
to minimise localised interference within the listening post
area. The transponder has a reflection loss of -8 dB, close
to theoretical maximum.
main attractions of the ASSA TP 40 are its small size, excellent
audio quality and very low power requirements so permitting
many different concealment options.