BENDIX ADF-T12B

DESCRIPTION AND OPERATION
5. TECHNICAL CHARACTERISTICS
TjTDe of Reception;
AM (Amplitude Modulation) Voice
CW (Models 201B/D-1/D only)
REC (Broadcast Receiver)
A D F ( A u t o m a t i c D i r e c t i o n F i n d e r )
Band 1: 190 through 440 KC
Band 2: 420 through 900 KC
Band 3: 850 through 1750 KC
With 75pv/m input, abearing within ±3. 0degrees will be
produced with aS+N/N ratio of 6db.
10 pv input for 50 milliwatts output into 500 ohm resistive
load with S+N/N ratio of 6db.
4kc maximum at -6 db points
12 kc maxi mum at - 60 db p oints
70 mw ±5 mw with 8pv minimum input at 200 KC and VOL
c o n t r o l s e t f o r m a x i m u m o u t p u t l e v e l .
Within 10 db from 200 to 2000 cps.
5 0 0 o h m h e a d s e t
1 3 . 7 5 v d c a t 7 5 0 m a m a x .
2 7 . 5 v d c a t 5 2 0 m a m a x .
Within plus or minus 3degrees with r-f inputs of 50 pv/m
o r m o r e .
10 to 55 cps ±0.03 inch total excursion.
M o d e s o f O p e r a t i o n ;
Frequency Range;
Threshold
S e n s i t i v i t y ( A D F ) :
S e n s i t i v i t y ( R E C ) :
Selectivity:
Audio Output:
Audio Frequency Response :
Output Impedance :
P r i m a r y P o w e r
R e q u i r e m e n t s :
ADF bearing accuracy:
Vibration:
O P E R A T I N G C O N T R O L S A N D T H E I R F U N C T I O N
6.
All operating controls for the ADF-T-12B,C System (with the exception of the 14/28v selector switch)
are located on the front panel of the receiver (See figure 1). The function of each control is as follows:
A.
B. FUNCTION SWITCH
The four-position rotary function switch controls the operating mode of the system. The switch
designations and their functions are as follows:
(1)
(a)
OFF. Disconnects the primary d-c source voltage from the system.
ADF. Establishes the necessary circuit connections for automatic direction finder operation.
REC. Establishes the necessary circuit connections for broadcast superheterodyne receiver
operation.
CW (Models 201B/B-1/D only). Connects the 1000 cps CW oscillator into the circuit for
a s s i s t a n c e i n t u n i n g - i n w e a k o r d i s t a n t s t a t i o n s .
(b)
(c)
(d)
C. BAND SWITCH
(1)
The three-position rotary band selector switch selects the tuned circuits for the three frequency
bands. The switch designations and frequency coverage are as follows:
190-440. Selects the range of 190 to 440 kilocycles.
420-900. Selects the range of 420 to 900 kilocycles.
850-1750. Selects the range of 850 to 1750 kilocycles.
April 1965
(Revised January 1968)
(a)
(b)
c
(c)
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