Heathkit IG 5280 Schematic

Page 1

M AC POWER
+ AND BATTERY
9V CONNECTIONS

PI

vsv POWER SUPFLV

2mm
-----------------

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I . I: _ ' I
I we OSWZ SW3 I00 I
I Tau/"J al%°?rm
I I
I I
I BATTERV ONLY I
I POWER CONNECTIONS I
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I Ew I
I I
I I
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I'm
0

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1'91, M

VERTICAL ZV/CM

HORIZONTAL 5MSEc/cM I
v

OUTPUT CONTROL

MAXIMUM CLOCKWISE 1 1 1

NOIES'

I. RESISIORS ARE 1/2 WAIT, 5'11, UNLESS OTHERWISE NOTED,
Z. RESISTOR VALUES ARE IN OHMS (II-1,000, M'I,DDD.DDOI.
3. CAPACIIDR VALUES ARE IN uF, UNLESS OTHERWISE NOTED.

r0

9:

AF OUTPUT

./\1/\ (\

SCHEMATIC or THE
HEATHKIT®
RF OSCILLATOR
MODEL IG-5280

4 v DENDIES CIRCUIT GROUNDI

SOnENotss A no VOLTAGE MEASURED FROM THE POINT
INDICAIED IO cnouun WITH IHE rouowmc coumnous

A. RANGE SWIICH ISWII MAXIMUM COUNTERCLOCKWISE.
B, IUNING CAPACIEOR ICIZ,CI!I MAXIMUM

COUNIERCIOCKWISE.

CI AF AMPLITUDE MAXIMUM COUNIERCLOCKWISE,
D, MEASUREMENTS MADE WI'IH A HIGH IMPEDANCE

VOLTMEIER.

(LU DENOYES A CIRCUIT BOARD CONNECTION.

LO omens OTHER connscnousI

8. SWITCHES ARE SHOWN IN CCW POSIIION. "D" ON SWITCHES
DENOTES DUMMY LUGS USED FOR ELECTRICAL 'IIE POINISI

9, SWI.AR SHORTS ALL UNUSED COILS I0 GROUND.

BAND 5A D

SWI
an

701 L
CAFACITANCEj

AF (ARrsEE NOTE 9)

0-47

I413

3171,}A

,E seruu

337. MODULATION
VERTICAL .Iv/cM
HORIZONTAL .ZMSEC/CM
TUNE AND RANGE MAXIMUM
COUNTEECLOCKWISE

MODULATION OFF
VERTICAL .Iv/cM
DID-32

COUNTERCLOCKWISE

5 mm

a; aunzw

HORIZONTAL ZHSEC/CM
TUNE AND RANGE MAXIMUM