TM 43-6625-916-12
RADAR TEST SET
0003 00
THEORY OF OPERATION - Continued
The TS-4530/UPM method for determing a transponder's MTL is to repeatedly interrogate the UUT with
bursts of 12, adjusting the level of each burst until the transponder responds with 10 replies (10-of-12 replies
corresponds to a reply percentage of 83%.). The process of MTL measurement begins with the first burst of
12 TS-4530/UPM interragations at the lowest transmit level, corresponding to a test distance of approximately
4 feet. Should the transponder respond with less that 10 replies, the burst is repeated at a transmit level 6 dB
higher. The process is repeated until 10 or more replies are received or the maximum level corresponding to
a test distance >250 feet is reached. Once communication with the transponder has been established, the
generator level is reduced in 1 dB steps until the reply rate falls back below the 10-to-12 threshold,
establishing the MTL within a resolution of 1 dB. The MTL is further resolved by increasing the burst levels in
dB steps until the 10-of-12 reply is re-established. Now that the transponder's MTL has been determined,
the TS-44530/UPM transmit level is increased to a level 3 dB above the MTL where % SLS reply, and other
measurements are performed.
INTERROGATOR TARGET OPERATION
The user has the option to perform interrogator testing in either single or multi-target mode. As most modern
interrogator systems are equipped with a display, the multi-target mode allows for quick verification of target
recognition in the presence of other traffic. Multi-target replies are generated at 4, 8,16, 32, 128, and 256 nmi.
Doubling the range of each consecutive target results in a 6 dB drop in level between replies. The target
grouping allows for automatic verification of time-controlled, gain circuits within the interrogator. All targets will
present the same code and altitude. In single target mode, one reply is generated at a distance of 4 nmi. The
user may select a normal, identification, or emergency reply type (Normal replies only are transmitted in multi-
target mode.).
EXTERNAL BATTERY CHARGER/DISCHARGER (PN: 01-1045-10)
NOTE
The external battery charger/discharger is for indoor use only.
Do not
expose charger or AC adapter to rain or moisture.
The external battery charger / discharger is powered from 12 volts supplied by the AC adapter. This charger
must only be operated from a 12 volt dc source. Battery sticks should not be left in the charger for extended
periods (over 30 days) when not in use, as there is a small amount of discharge due to the battery voltage
sensing circuits within the charger, which could result in excessively deep discharge and battery damage if
stored for several months. The battery charger may be left plugged in when inserting and removing batteries,
but it is recommended to unplug the AC adapter when it is not in use.
Do not attempt to charge any batteries other than the supplied battery sticks
or commercial C-size NI-CAD or NiMH batteries. This could result in battery
explosion and cause injury or death.
NOTE
Battery sticks should not be left in the charger for an extended period of time
(over 30 days) when not in use, as there is a small amount of discharge due
to the battery voltage sensing circuits within the charger, which could result in
excessively deep discharge and battery damage if stored for several months.
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