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Figure 1-2. Receiver-Transmitter, Radio RT-859/APX-72 functional block diagram.
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TM-11-5895-490-20 Receiver-Transmitters Radio RT-859/APX-72 RT-859A/APX-72 and Mountings MT-3809/APX-72 MT-3948/APX-72 Manual
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Table of Components
NAVSHIPS 0967-217-4010
TM 11-5895-490-20
frequency of operation is in the uhf band mak-  3948/APX-72 provide a frame for mounting
ing range dependent on altitude of aircraft.
the RT-859/APX-72 in the aircraft or surface
f. Mountings MT-3809/APX-72 and MT- vessel.
1-5. Technical Characteristics
a. Receiver-Transmitter, Radio RT859/APX72.
Number of modules ----------------- 26
Number of silicon diodes ------- 311
Number of transistors --------------196
Range-----------------------------------Line-of-sight.
Response--------------------------------------Limited by interrogation rate and internal limiting action.
Power requirements ------------- 28 vdc, 70 watts maximum or 28 vdc, 8.4 watts and 115
vac, 95 va maximum, 360-440 cps.
Power source --------------------------28 vdc source or 28 vdc and 115 vac source.
Operating temperature range --- 54 (--65F) to + 95C (203F).
Warmup time ------------------------- 1 minute maximum standard condition.
2 minute maximum extreme service conditions.
Pressurization ---------------------------5 psig at sea level (can operate unpressurized to 30,000
feet).
(1) Receiver:
Type of signal received ------ Pulsed radio frequency.
Frequency ----------------------1030 0.5mc.
Bandwidth -----------------------Minimum 7 mc at 6 db point.
Maximum 25 mc at 60 db point.
Frequency stability ---------- 1.5 mc maximum for a period of at least 500 hours.
Sensitivity:
Normal triggering level --- Between 69 and 77 db below 1 milliwatt.
Low triggering level ------ Between 52 and 67 db below 1 milliwatt.
Random triggering rate ------- Maximum of five replies per second averaged over a one-
minute period.
Triggering bandwidth ------ 2.5 mc at 3 db points.
Type of signal transmitted -- Pulsed radio frequency.
Frequency --------------------------- 1090 0.5mc.
Frequency stability ------------- 3 mc maximum drift.
Peak power output ---------------- 500w 3 db.
Duty cycle ---------------------------- 1.1 percent maximum.
Delay ----------------------------------- 3.5 5 sec between the leading edge of the second inter-
rogation pulse to the leading edge of the first reply
pulse.
Spurious responses --------------------- Maximum of 60 db down from the aplitude of trans-
mitted pulse.

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