By
DON LANCASTER
BUILD
THE
AMLIGNER
... A MULTIPURPOSE
TUBELESS, TRANSISTORLESS,
CORDLESS
BC -BAND SIGNAL
GENERATOR
FOR THE RADIO AFICIONADO
ABROADCAST
-BAND AM
signal gen-
erator without test cables or even
a
line cord?
Yes! And
what's
more, it
uses
no tubes,
no transistors,
no
inte-
grated circuits ...
nothing but
a diode,
a
resistor, a coil, and a couple
of ca-
pacitors.
Yet,
here's
an
r.f.
signal
generator
that you
can use to signal -trace radio
receiver troubles,
to align the
receiver
i.f. and
front end
-provided you first
calibrate the
unit -and
which,
in
con-
junction with any broadcast -band re-
ceiver, can be
used
as a
code -practice
oscillator
by
merely
substituting
the on-
-sl
_ R2I
2-v2V
DI
POLARITY
ORIENTATION
RI
471<
LI
LOOPSTICK
ANT.
DI
M4L3054
I
.02pCF
2
409pF
Fig.
1
The
AMLIGNER is a free -running
relaxation
oscillator
whose frequency
is
determined essential-
ly by the value chosen for charging capacitor Cl.
60
off switch for an
ordinary
telegraph key.
And
what's the
miracle ingredient
that
makes
all this possible?
Nothing
more
than a
low-
power,
short -range radio
transmitter that sends out an
r.f.
car-
rier modulated
by a 800 -hertz tone sig-
nal
which
is picked up by
a receiver
placed about eight
feet
away.
We call it,
affectionately, the "AMLIGNER."
You
can build it for about $7.00.
How
It
Works. The
AMLIGNER
(Fig.
1) is basically
a
free -running
relaxation
oscillator operating at 800
hertz. The
circuit is
powered
by a 22.5
-volt
battery,
PARTS LIST
B1 -22/
-volt
battery
C1- 0.02
-MF, 50 -volt Mylar capacitor
C2
-15
to
409
pF TRF variable capacitor
(sim-
ilar to Allied
Radio
43
A
3524)
Dl-
Motorola M4L3054
four
-layer
diode (avail-
able
from Allied Radio, Chicago,
Ill.)
L1- Loopstick
antenna
(similar to I. W. Miller
Company
2004)
R1-
47,000
-ohm,
/ -watt resistor, i- 10%
S1-
S.p.s.t.
rotary
switch
l- Plastic
case
and
cover
(similar to Harry
Davies 240 and 241,
or Allied Radio
42 D
7885 and 42 D 7887, respectively)
Misc.
- 4" and
1Y4" plastic knobs,
#6
hardware
or pop rivets,
battery holder, 5 -pin
terminal
strip,
wire,
solder,
etc.
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