Astor P 123 BQ Cirquit Diagram

TRANSISTOR PORTABLE

P61

MODEL P123R Q

w n n r m

TRA NSISTO R

TRIMMING PROCED UR E

Apply signal

as below

(1) 325 Kcs, capacitor

input junction of
loop tap and C3.

(2) As No. 1 but 600

Kcs, series generator
feed — capacitor in·
put and 400 ohm
resistor.

(3) As No. 2 but 1500

Kcs.
(4) Repeat 2 and 3 until calibration is correct.
(5) Replace receiver in case, connect outp ut of generator to loop of

wire and place loop about 1 foot from one end of ferrite rod antenna.
(6) 600 Kcs from gener

ato r to loop.

(7) 1500 Kcs from gen

erato r to loop.

(8) Repeat 6 and 7 then seal L1 in position on the ferrite rod.

Set receiver

to

L.F. end of band (i.e.

Gang fully mesh
ed).

Set dial to 600 Kcs.

Set dial to 1500 Kcs.

Set dial to 600 Kcs. L1 on ferrite rod.

Set dial to 1500 Kcs.

Adjust in order for

maximum o utput

Cores of T3, T2, T1

and L3.

Repeat for max.
Core of L2.

Trim mer C6.

Trimmer C2.

* EMITTER

KE Y TO TRANSISTORS

Ξ *Ξ Β = Ξ ϋ Ξ

6
ll

Π * A

ts .w si

his*

ΓΊΪΊ (»

ϋ

25

21?

19*

POSITION OF COMPONENTS

BENEATH VOLUME CONTROL

RI8 AND T5

n o t e :- r e s ist o r s sh o w n

SOLID BLACK.

LI (tap)

n r -

s - t -

'n n

POSITION OF COMPON
ENTS BENEATH GANG

CONDENSER

P1 23BQ

CONNECTIONS

OF TRANSISTORS

T6.B T6.B T5.0 T6.R T O

JI-4 ARE JUMPER CONNECTIONS.
TRANSISTORS SHOWN THUS-iT^

BATT ERY CONSUMPTION 7mA AT 6v. WITH NO SIGNAL INPUT.

Transisto r Function

Code

Frequency Changer

TR1

1st I.F. Amplifier

TR2

2nd I.F. Amplifier

TR3

A.F. Amplifier

TR4

Out put

TR5

Ou tput

TR6

ote: All measu re m e n ts taken with no signal input. Gang fully meshed.

N

Measurements taken with an Avome te r Model 8 ins tr ument which has a resistance of 20,000 ohms per volt.

V6/R4M
V6/R4
V6/R2 865200 —5.45
V10/50B
V10/30A
V10/30A 865004 —6.00

Type

CIRCUIT ANALYSIS

Ec

Ref. No.

—4.20

865208
865206 —6.00

865006 —5.45
865004

—6.00 1.2mA

Ic Eb

0.5mA —0.37
—0.79 —0.82

0.7mA
—0.99 —1.07

0.45 mA

1.9mA —0.60
—0.19
—0.19

1.2mA

C* COLLECTOR"

B *BASE —
E-EM ITTER

Ee

R.C.A. G.T.C.
2N219

-0 .37
2N218
2N218
2N217

—0.5
—0.022

2N270

—0.022

2N270

C6 E

Transis to r Alterna tiv es

Milliard
GT761R OC45
GT760R
GT759R

OC45 XA101
OC45
OC71
OC72
OC72

Ediswan

XA102

XA101