Heathkit IM-4180 - Page 12

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Refer to Pictorial 8-1 (Illustration Booklet, Page 10) as
wnires dthafoallaunacinfa Han warhinhk tenrovidad
YOu T@aa Wi (O1L1LGOWig inOrMation Wiictn is proviacea
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mainly to acquaint you with the controls, the
switches, and the functions of the FM Deviation Me-
ter. Further sperenene. information is supplied
under tha handing ‘An atinne ' NIOTE. Tha lattare
LLG heading ‘ d \pplications. 1WAY Eda. LLEIG IGLLULO
in front of each component called out in the following
text, correspond to the lettering on Pictorial 8-1.
£ 5
¢ s
A. ON-OFF switch (red): Use this switch to turn the
ff. If
power to the instrument on and off. If you use
rechargeable hatteries the charaao rata will nat
i vase Valtoii05, the Cilai Be ra weirs Tse
be affected by the position of this switch. Sw
positions — In = ON, Out = OFF.
aa
an internal cheek of the pationes. When bat-
teries are used with the Deviation Meter, you
should push this switch in occasionally to make
cure the hatteriae are in annd condition, Check
cure Lie patlerieg are ing ooG cone tom, (neck
B. BATT sv
the battery condition on the lowest scale of the
meter; the pointer must be within the white por-
tion jabeled ee Tf it is not, replace or re-
charge the batterie
MeeeGie A4f BPEL SS
C. TUNE switch (white): Use this switch in con-
junction with the large tuning dial to seek the
FM carrier signal y you desire, which you will
then tune to a peak indication on the meter
using the controls as described in F. and G.
These switches sacral eg maximum range of
the deviation from the carrier signal — or
full- scale deviation Sel The two red
pushbuttons at 75 and 7.5 kHz correspond tothe
red meter scale (0 - 7.5), while the two black
pushbuttons corresponding to the black meter
amalean {nm 9n1
SUdll [U-a2U).
DD. Four kHz DEVIATION switches (2 red, 2 black):
DE-EMPHASIS SWITCH (E.}
Th. NMGWAADITACTCQ ...-! pa Fen on
The DE-EMPHASIS switch fou fiS GE-
emphasis as used in two-way radio systems, or 75 us
de-emphasis as used in standard FM broadcasts. This
switch affects only the speaker (SPKR) Baan The
d dayiatinn and -«
GevidtiOn dia
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Page 49
MAIN TUNING (large knob): Controls the local
oscillator main tuning function. Controls the
action of tuning capacitor C212 through a 6:1
reduction drive and the nacitin n f tha fro
eae so
ana tne positior ning or the ire-
quency dial pointer.
This control is
Pand tha TILIG
ane tic Urir
iho to assist in obtainin a best tuning
on frequency
ex is aligned
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GAIN control: Use this control to attenuate
especially strong signals to keep the meter
pointer within the “TUNE” range shown onthe Arn
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meter dial. Signals can be anywhere within the
meter range without affecting the measured de-
viation.
ae LEVEL control: Controls the audio level
t the SPKR output jack only. The control, when
urned fully counterclockwise, switches off the
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a
9
a.
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A
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F
ia)
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oo a
viation Meter without b attaribst If you use the
r
Pets Lk (ig) egret [peer Ieee Sire Meera ernemey (NMOEY EREPECS by [eT EL AON Caan RcapeCnnCRT ORR mene ee
Will De Kept CHarped al dil LINES, eCrely TeEMLove
the Charger/Eliminator plug for battery-
powered operation.
Tawi AY Abe: ea ae A eel ee
SPKR Jack: AA SldiludsuU LWU- pole plu © Jadth Udll
be used to connect an 8-ohm eecake or head-
phones to the Deviation Meter. Monaural FM
signals are amplified, detected, and coupled to
the speaker output in a similar manner as ina
standard receiver.