If Unit - Yaesu FT-180A Instruction Manual

5.
b)
c)
b )
c)
NB Coil Adjushnent
Set the CHANNEL selector to any installed
channel, and oonnect the signal generator to
the ANTjack.
Connect the DC voltmeter to TPoT on the IF
unit, and adjust the signal generator oulpur
to 40 dB on the channel frequency.
Now adjust T.o,r, Tro,, and Troro for mtnl-
mum deflection on the DC voltmeter.
SMeter Alignment
Without rpplying any signat to the ANT jack,
and with the RF GAIN control fully clock-
wise, adjust VRroo. to the point where rne
S'meter just starts to deflect.
Apply a 90 dB signal fiom the signal generator
to the ANT jack, and adjust VR,ooa for a
deflection of 59+60 dB.
Reduce the amplitude of the signal generator
to l0 dB, and adjust VR,oo, to the point
where the S-meterjust starts to deflect.
Repeat Steps b and c until the proper deflec-
tion is obtained.
Product Detector Alignment
w. t h o u t a p f , ly i n e a n ) 5 i g n a l ro rh . r e c e i v e f ,
adjust VR3ooj for a minimum rcading on the
S-meter.
7.
I
)
IF UNIT
3 I