The LG 3238 and LG 3219 generate CW, FM, AM, and simultaneous FM and AM
signals in the frequency range of 100 kHz to 140 MHz as well as CW and FM
signals in the frequency range of 162 MHz to 163 MHz. They are equipped with
remote control capabilities.
These generators feature monaural FM and AM functions and an FM stereo modulator
that complies with FM stereo broadcast standards.
Fundamental oscillation is used to generate frequencies between 70 MHz to 140
MHz and 162 MHz to 163 MHz directly.
These signals are used to derive 100 kHz to 35 MHz signals through the
heterodyne method and 35 MHz to 70 MHz signals through the 1/2 frequency
division method.
The LG 3238 and LG 3219 are synthesized signal generators that produce accurate
RF signals, which are phase-locked at all times to the internal reference
crystal oscillator. The frequency resolution is 100 Hz.
The ΔF function can be used to get a direct reading of how much the
frequency is offset from the reference frequency. In addition, the frequency can
be changed in preset steps. The output level can be set to a value from -20 dB Micro
V [emf] to 126 dB MicroV [emf] in 0.1 dB steps. With the exception of the use of a
relay to switch to 106 dB MicroV [emf], a solid-state attenuator is used to switch
the output levels in order to extend the generator s service life.
The ΔdB function can be used to get a direct reading of how much the output
level is offset from the reference level. In addition, the output level can be
changed in preset steps.
These generators can apply frequency modulation and amplitude modulation
simultaneously. This feature can be used to combine internal modulation signals
with one external modulation signal.
The internal stereo modulator generates composite stereo modulation signals that
comply with FM stereo broadcasting systems.
These generators have a preset function that can store 100 sets of frequency,
output-level, modulation-mode, and external control output-signal settings. A
preset can be recalled as necessary to reconfigure the generator.
The front panel settings are retained even when the power is turned off. If the
generator is turned off and then turned back on, the previous settings are
restored.
These specifications and features are the reasons why these generators are used
in a wide variety of ways. They are used as automation devices for the
manufacturing and inspection of AM and FM receivers and electronic components
and as signal generators for servicing, research, and development.
Features:
Wide-Band, High-Level Output
These generators cover a wide frequency range from 100 kHz to 140 MHz and
generate a high level of output at 126 dB MicroV [emf].
High Stability
The RF output signal is always phase-locked to the internal crystal
oscillator to ensure high stability at 510
-6(5 ppm).
Long Service Life
A solid-state attenuator is used for varying the RF output signal level to
extend the generator s service life.
ΔF and ΔdB Readout Functions
The ΔF function displays the relative RF frequency from a given
reference. The ΔdB function displays the relative output level from a
given reference.
Preset Memories
Up to 100 sets of frequency, output-level, modulation, and other settings
can be stored as presets and recalled as necessary.
Output-Signal Setting Adjustment
The rotary knob can be used to change a specific digit of an RF-frequency,
output-level, or depth setting.
Remote Control
The generators are standard equipped with GP-IB, RS232C, and external
control interfaces.
Weather Band Output
The generators can internally produce RF output from 162.0000 MHz to
163.0000 MHz (only FM monaural modulation).
Internal Stereo Modulator
Equipped with an FM stereo modulator, a single LG 3238 or LG 3219 can
generate stereo modulation signals for performing tests and measurements on
FM multiplex receivers.
DDS for Internal Modulation
As internal modulation signal sources, these generators have a DDS in
addition to an RC oscillator. The DDS enables frequency settings ranging
from 20 Hz to 20 kHz in 1 Hz steps. It can be used to test the frequency
response of receivers.
5
10
-6(5 ppm).