PASCO WA-9318 Instruction Sheet

Instruction Sheet
for the PASCO
Model WA-9318
MICROWAVE MODULATION KIT
Microwave
Transmitter
Adapter Plug

Introduction

The WA-9318 Microwave Modulation Kit turns your
PASCO Microwave Transmitter and Receiver into a
microwave communications system. Talk into the
microphone and your voice modulates the amplitude of
the transmitted microwaves, sending the signal
through space to the receiver. You can monitor the
signal at the modulator using an oscilloscope. The
signal at the receiver can also be monitored with an
oscilloscope, or you can use an audio amplifier and
speaker to provide an audible output. (The oscillo-
scope, amplifier, and speaker are not provided.)
For more quantitative investigations, the modulator
provides a triangular wave output with variable
frequency (0.4 - 4 kHz), amplitude (0 - 6 V peak-to-
peak), and bias (a DC offset to demonstrate "clip-
ping"). Using this triangular wave with an amplifier
9VDC SCOPE MIC
GUNN
MODEL WA-9318
PASCO
MICROWAVE
scientific
MODULATOR
DIODE
FREQ
BIAS
AMPL
0.4 - 4 KHZ
MICROWAVE
MODULATOR
Microwave
Receiver
Top View
ON-OFF
ON Switch
OFF
Bottom View
Battery
Compartment
MICROPHONE
Plug in for audio input.
Unplug for triangular
wave input.
and speaker, you can add an audible output to your
standard microwave experiments—a useful addition to
class demonstrations.

Equipment

Your WA-9318 Microwave Modulation Kit
includes (see above):
1. Microwave Modulator
*2. Microphone
3. Adapter Plugs
* Microphone: low impedance, 50-15,000 Hz fre-
quency response (replacement battery = 1.5 V
Eveready A76 or equivalent)
012-02960D
12/03
9 V Power Adapter:
Plug into 120 VAC,
60 Hz outlet.