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General
Description
The PTS1220 is a high quality
synthesized Spectrum Analyzer module
designed for use in the laboratory
or out in the field. This spectrum
analyzer covers the frequency range
of 10 kHz to 1.2 GHz, but is usable
from 5 kHz to 1.4 GHz. The PTS1220
can either be used with an
oscilloscope or computer for its
display. If an oscilloscope is to
be used, the oscilloscope is set to
thx`x`e X-Y mode and the PTS1220 is
connected using the X,Y,Z
(horizontal, vertical and intensity
modulation) inputs of the
oscilloscope. When a computer is
used, the PTS1220 connects to the
computer using the RS232 and USB
input ports.
Key Features
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10 kHz to 1.2 GHz frequency
range.
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Synthesized operation. Accurate
center frequency setting.
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Direct digital synthesis. Tune
center frequency in 10 Hz
increments.
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Six resolution bandwidths from 1
MHz down to 300 Hz
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Tracking Generator option, ideal
for testing filters.
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Signal Generator option with AM
and FM modulation.
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AM/FM receiver option. Listen to
signals off-air.
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100 Watt RF input capability
option.
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Links with computer or
oscilloscope.
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Software available to drive
PTS1220 from computer and record
waveforms on computer.
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PTS1220 used with laptop
computer |
PTS1220 used with
oscilloscope |
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Synthesized Operation
The PTS1220 spectrum analyzer uses
direct digital synthesis to
accurately display the centre
frequency. This means the centre
frequency can simply be entered via
the keyboard or set with a rotary
encoder to a resolution of 10 Hz
(100 Hz above 1 GHz).
Keyboard or Rotary Knob Control
Parameters such as Center Frequency,
Reference Level, Span, Resolution
Bandwidth etc can easily be changed
either by entering the parameter via
the 30 button keyboard or by using
the rotary encoder. The rotary
encoder allows fast, easy, changing
of parameters and arrow keys select
what digit is to be changed. For
example, when changing the center
frequency with the rotary encoder,
the arrow keys are used so that the
rotary encoder increments in either
10 Hz, 100 Hz, 1 kHz, 10 kHz, 100
kHz, 1 MHz, 10 MHz or 100 MHz
increments. Most parameters are set
in a similar fashion.
Very Large Amplitude Range
The PTS1220 spectrum analyzer has
built in attenuators and pre
amplifiers to allow signals to be
measured over a 180 dB range. The
standard unit measures signals from
+23 dBm to - 130 dBm. Option 04
extends this range from +50 dBm (100
watts) to - 130 dBm, an amazing 180
dB of measurement range!
Six Resolution Bandwidths and
Seventeen Spans gives great
Flexibility
The PTS1220 spectrum analyzer has
resolution bandwidths of 1 MHz, 300
kHz, 100 kHz, 25 kHz, 3 kHz and 300
Hz. Spans from 120 MHz per division
all the way down to 1 kHz per
division and zero span, allows
signals to be displayed exactly the
way you want. No spectrum analyzer
in this price range has a 300 Hz
resolution bandwidth. This not only
allows very low amplitudes to be
measured, but also Bessel Function
displays can be easily seen. Very
accurate measurement (< 1 % error)
of FM deviation can also be made.
Best Phase Noise in its Class
Phase noise if often overlooked, but
is one of the most important
features of a spectrum analyzer.
The PTS1220 synthesized spectrum
analyzer has the best phase noise in
its class. Typical phase noise is
-90 dBc/Hz at a 10 kHz offset and
-80 dBc at a 2 kHz offset. Residual
FM is < 50 Hz.
Optional Internal tracking Generator
is also a Signal Generator with AM
and FM Modulation!
Tracking Generator
Option 01 is an internally fitted 10
kHz to 1.2 GHz Tracking Generator.
The tracking generator allows
filters or duplexers to be measured
with sweeps from 1 kHz per division
all the way up to 120 MHz per
division. Option 05 adds a
directional coupler. Return loss
measurements can be made on antennas
or any circuit that is connected to
the coupler port. This effectively
makes the PTS1220 into a simple
Network Analyzer, at a fraction of
the price.
Signal Generator
On top of this the tracking
generator also functions as a signal
generator. Set the span to 0 kHz
and the tracking generator becomes a
signal generator. The output level
can be adjusted from -10 dBm to -100
dBm in 1 dB steps. Option 02 adds
AM and FM modulation to the signal
generator. AM modulation up to 96%
and FM deviation up to 200 kHz make
the signal generator really useful.
AM / FM Receiver with Modulation
Meter Capability
Option 03 ads an AM and FM receiver
with built in loudspeaker. This
option is great for listening to
signals off air. Interfering signals
can now be easily identified by
simply enabling the receiver. AM
and FM modulation can be accurately
measured using the computer or
oscilloscope display.
100 Watt High Power RF Input
Option 04 adds a 30 dB internally
fitted attenuator. This allows up
to 100 watts of RF power to be
applied to the spectrum analyzer.
Thus transmitter spurious can now be
easily and accurately measured.
High Quality of Construction
The PTS1220 is made to the highest
standards. All RF circuits are
housed in aluminum encloses which
have been milled out of solid pieces
of aluminum. These modules sit on a
steel base plate with a motherboard
connecting all the modules. This
motherboard uses standard IDC,D sub
and SMB connectors, which offer
better reliability. Fault finding
becomes easy, as each circuit is
housed in individual aluminum
modules, making module replacement
simply. This greatly speeds up
servicing. |
