Heathkit GR 98 Schematic

Page 1

EXTERNAL
ANTENNA

z cm:

*

L715
LOCAL m y
OSCILLATOR C II
' '2 "22 0103

[112

*
MEASURED WITH NO SIGNAL XYAL
RED

a RED
OR
HEATH MANUFACTURER BASING I .
PART NO. AND TYPE N0. | J
1 I VAR _
/BASE I i E
417113 GE 2N3393 {WOOLLECIOR I I '
VEMITTER I 1
I
|
/EMITTER { I
417-121 AMPEREX 2N2430 @BASE I l
\COLLECTOR I ______
,-___---------------_--
IEMHTER : 10@ or use 0 ~
417'122 AMPEREX 2N243I @BASE I XTALvVAR SWITCH<->
COLLECTOR :
I ELK
,.EM|IIER :
417-154 6 E 2N2369 @BASE : GRA88" 3 ,
~COLLECTOR : AC pOWER 7
I _-..
EMITTER I SUPPLY RED Cl? I
BASE I @
417-190 R c A 40481 I
I
SHIELD COLLECTOR I
= +
_ ,l-BASE : i
417-201 6 E X29A829 tCOLLECTOR .
EMIIIER :
I
/»GATE L____..---_-_-----_-_-----.
417-169 MOTOROLA MPF 105 g-SOURCE
\\DRAIN

Page 2

cm
5,2. Rm

MU}

km:

I may

IF IF IF
AMPLIFIEn AMPLIFIER n AMPLIFIER
92 ca 3812; 04
2N2369 2N2369612; l- _ 1 2N2369

CRVSTA L

OSCILLATOR (if;
M
L;
3.9 013 3.2 [1 rue-m iii;
| % 40481 c 0.0 | {1,
I 0.0 I 7 2-2::
a s L__,
l N52 :32
I 3900 300 E
/ a.o
' // I 3 0
TED
-1 / | O m. U
'z$_§§/ I 0 50cm Ss nun
EN
5 0FF® I Is
I m
; 5mm 27 :5;
;Isc CELLS) I -‚¬01;
|
I-I _

ALI RESISTOR VALUES ARE IN OHMS- K=IOOD
ALL RESISTORS ARE 1/2 WATT.

ALL CAPACITOR VALUES LESS THAN 1 ARE IN uF. VALUES 0F 1 AND
ABOVE ARE IN pF UNLESS MARKED OTHERWISE.

ca:
moon:

AUDIO
PREAMPLIFIER

s SELECTOR SWITCH IS SHOWN IN VII!
6 VINDICATES CIRCUIT BOARD GR

7 fINDICATES CHASSIS GROUND.

8 O INDICATES TUNER CONNECTION
DC VOLTAGE MEASUREMENTS ARE TAKEN WITH A HIGH IMPEDANCE VOLTMEIER

FROM THE POINT INDICATED T0 CHASSIS GROUND

OTHIS SYMBOL INDICATES A MEASUREMENT TAKEN WITH THE SOUELCH

CONTROL FULLY COUNTERCLOCKWISE.

:ITHIS SYMBOL INDICATES A MEASUREMENT TAKEN WITH SQUELCH
CONTROL AT THE THRESHOLD ISEE SOUELCH IN FIG. ll,

THIS SYMBOL INDICATES A MEASUREMENT TAKEN UNDER THE FOLLOWING

CONDITIONS-
WITH OSC SWITCH IN THE XTAL POSITION
A CRYSTAL IN THE CRYSTAL SOCKET.
AND NO SIGNAL INPUT

9 BINDICATES CIRCUIT BOARD cm
10 GINDICATES PARTS MOUNTED ONI
11 RESISTORS AND CAPACITORS ARE II

1799 CHASSIS ANI
IUOTIW AMTUNER PAT