Heathkit GDA 57 1 Schematic

Page 1

IENCODER CIRCUIT BOARD 'I

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CABLE _ I __C5 ff CHANNEL 1 C6 CHANNEL 2 _

m 8 0 I : I SPA : ff »-~-005 5;; 3 RANGE 005 3 RANGE *-

,/ ® 0 --on CE : J, . CONTROL CONTROL

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CIRCUIT BOARD, : '- --'~.022 ---~.oou
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CIRCUIT BOARD, I V . V I
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L-------------------------dhm-------- 3}-J-I -{2} -------- %6 n- 4 - 5;?------E
9.6V P TO P ..
' W.R20/( '36 53132202
5000 . 5000
SCHEMATIC OF THE E CHANNEL1 5;.1 CHANNELZ
3 STICK CONTROL ,-.;'-:'-;2"- STICK CONTROL
H EA T H K I T®
3-CHANNEL DIGITAL PROPORTIONAL ----------------
d
TRANSMITTER

96v

PIOP

MODEL GDA-57-1

Page 2

9.6V P TO P

5005

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CONTROL
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BLE TIMER

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MONOSTABLE TIMER

9/5
4700

------__--------_----__@}---

...............

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.-- 9 .. 7 {8}"-----------..-----.-

-~.'.--u,-_::;.

CHANNE L
AUXILIARY CONTROL

Li

9.6V P To P

0-99
100-199
200-299

ALL RESISTORS ARE T/IZ'WATT UNLESS MARKED OTHERWISE. RESISTOR VALUES

RF CIRCUIT BOARD

27 MHZ
BAND

53 MHZ
BAND

72 MHZ
BAND

ARE IN OHMS (K :1000I.

ALL CAPACITOR VALUES ARE IN DF UNLESS MARKED OTHERWISE.

REFER TO THE CHASSIS PHOTOGRAPHS AND CIRCUIT BOARD X-RAY VIEWS FOR THE

NOTE:
THE 27.

C201 IS USED ONLY WITH THE 27
MHZ BAND TRANSMITTER, TFzE
OTHER BANDS USE A IUI'II'IPEI2 WIRE
AND NO CAPACITOR, R204 [3 USED
ONLY ON THE 72 MHZ BAND.

AND 72 m MHZ BANDS OF
RF TRANSMITTER CIRCUIT EACH
HAVE A DIFFERENT SCHENIATIC.

ISEE SCHEMATICS AT RIGHT.

wH---I

WHIP
ANTENNA

r'" "T OPTION

SEE NOTE 9(-

I.»

3 R204
:3 I200
I

i

CRYSTAL
FREQUENCY MHZ
TRANSMITTER RECEIVER
26.995 26.542
27005 26692
27.095 26.642
27,145 26.692
27_I95 26.742
53.100 26.3235
533.200 263735
551.360 264235
53400 26.4735
53,506 26.5235
36an 36.2665
36.120 36.3465
36.200 364265
36460 367065
37620 37.5935

PHYSICAL LOCATION OF PARTS.

X29A829

2N364I

RESISTOR AND CAPACITOR NUMBERS ARE IN THE FOLLOWING GROUPS:

PARTS MOUNTED ON THE ENCODER CIRCUIT BOARD.

PARTS MOUNTED ON THE RF CIRCUIT BOARD.
PARTS MOUNTED ON THE CHASSIS.

OTHIS SYMBOL INDICATES A POSITIVE DC VOLTAGE MEASUREMENT. TAKEN
WITH A HIGH IMPEDANCE VOLTMETER, FROM TI-IE POINT INDICATED To CHASSIS
GROUND. VOLTAGES MAY VARY 220%.

2N2369