M A I N T E N A N C E P R A C T I C E S
!
D E TA I L S T E P S / W O R K I T E M S
Adjust output of signal generator until output
m e t e r i n d i c a t e s 5 0 m i l l i w a t t s o u t p u t p o w e r.
Remove the 400 ops modulation signal.
Repeat steps (d) through (g) at the following
frequencies: 400 kc. 450 kc, 800 kc, 1000 kc
and 1600 kc. Adjust band selector switch
accordingly.
KEY ITEMS
Signal generator output set for 10 ^v/
m e t e r fi e l d s t r e n g t h .
Audio output should drop 6db.
(0
(g)
(h)
R e c e i v e r S e l e c t i v i t y Te s t
(0)
Connect the equipment as illustrated in
Figure 102.
Set o u t p u t m e t er f or 500 ohm load.
S e t r e c e i v e r f u n c t i o n s e l e c t o r s w i t c h t o R E C
position.
Adjust signal generator to 300 kc, modulated
30% at 400 cps.
T u n e r e c e i v e r t o 3 0 0 k c .
Adjust output of signal generator to 10 /jv/meter
field strength and note reading on output meter.
Increase output of signal generator to 20 jxv/meter
field strength and de-tune the signal generator on
either side of the center frequency until output
me t e r i n d ic a t es t h e s a m e r e a di n g as w a s fo u n d
in step (f).
Increase the output of the signal generator to
10, 000 pv/meter field strength and de-tune the
s i g n a l g e n e r a t o r u n t i l t h e o u t p u t m e t e r i n d i c a t e s
the same reading as was found in step (f).
Perform steps (d) through (h) at 450 kc
and then at 1300 kc.
(a)
(b)
(c)
(d)
(e)
(f)
Total bandw i d t h should be amin i m u m
of 2kc.
(g)
c
●s.
Total bandw i d t h should be amax i m u m
of 12 kc.
(h)
4 5 0 k c - 6 d b b a n d w i d t h = 4 k c m a x i m u m .
1 3 0 0 k c - 6 0 d b b a n d w i d t h = 1 2 k c m a x i m u m .
(i)
(4) AD F T hr e sh ol d Sen sit iv ity
Connect the equipment as illustrated in
Figure 102.
Apply power to all equipment and allow 15
minutes for warm-up of test equipment.
Se t the outp ut me ter for 5 00 ohm load .
S e t t h e r e c e i v e r f u n c t i o n s e l e c t o r s w i t c h
to ADF position.
(a)
(b)
(c)
(d)
April 1965
(R e v i se d J a n u a r y 1 9 6 8)Page 116
To Next Page
Loading...
General