Elenco Electronics EP-130 - RF Signal Tracer

-
140
-
This experiment is a wide band, untuned RF si
g
na
l
tracer. You can use it to check for antenna si
g
nal
s
and find sources of RF noise and interference. Thi
s
c
ircuit is like an untuned crystal set
.
The 100pF capacitor in the input blocks D
C
and th
e
60Hz power line frequency, so the wires can touch
almost anywhere without fear of electrical shock.
O
f
c
ourse, you should never intentionally probe aroun
d
hi
g
h volta
g
e
.
Attach the probes between grounded objects an
d
other metallic objects that can act as antennas. Yo
u
will
f
ind that this circuit allows you to receive all kind
s
o
f
AM si
g
nals as well as noise. For example, i
f
you
h
ave c
i
t
i
zens
’
b
an
d
transm
i
tters, you can
h
ear t
h
es
e
signals i
f
the transmitter is close enough to the signal
t
racer
.
S
ometimes you mi
g
ht hear noise from fluorescen
t
lights, auto ignition systems, light dimmers, o
r
sw
i
tc
h
es open
i
ng an
d
c
l
os
i
ng
.
N
otes:
EXPERIMENT #11
8
: RF
S
I
G
NAL TRA
C
ER
Schematic
Wiring Sequence:

89-97-126

90-92-100-EARPHONE-PROBES

125-99-91-EARPHONE

98-PROBES