Cushman Electronics Inc. CE-15 Spectrum analyzer
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Model:
CE-15
Date:
1977
Category:
Group:
Description:
Spectrum Monitor
Information
The Cushman CE-15 Spectrum Monitor is particularly designed
for use in the Radio Maintenance field. It provides the user
with the capability of visually monitoring a selected
portion of the radio frequency spectrum lor the purpose of
determining spurious emissions, intermodulation
interference, unwanted Oscillator radiation, and harmonic
levels. This instrument can monitor and audibly identify AM
and FM carriers, which is particularly useful in the case of
interference. It may be used to check intermodulation
distortion between RF signals, do IF and RF signal tracing
and may be used as a field strength receiver when using a
calibrated antenna.
DESCRIPTION
1.02 The Spectrum Monitor is essentially a triple conversion
superheterodyne receiver with a video display as well as an
audio output demodulated from either AM or FM signals.
The frequency range Is from 1 to 1000 MHz. It has four scan
widths, 10 kHz, 100 kHz, 1 MHz and 10 MHz per division. It
also has a selectable 2 kHz bandwidth Filter on the 10 kHz
scan width range to reduce noise when viewing low level signals.
1.03 An LED frequency display with Coarse and Fine tuning
controls provides for accuracy in setting the center
frequency of the display and a graticule calibrated in 10 dB
per step divisions makes it possible to view a 70 dB
amplitude signal. Its high sensitivity, -115 dBm (0.4/µV),
permits viewing extremely low level signals.
1. 04 Front panel access to an internal level
and frequency reference makes it possible to maintain a
level accuracy of measurement of better than ± 3 dB. It is
possible to introduce an external calibrated signal from an
accurate source such as a CE-6A Communications Monitor for
use as a frequency calibrating marker simultaneously with
the signal being monitored.
1.05 Sweep rate and IF Filter controls have
been eliminated. These arc set to their optimum value for
each range selected. A first IF of 2100 MHz eliminates
problems from image frequencies, since they will be 1.2 GHz
away from the frequency of interest.
Manual type:
Service and User Manual
Pages:
30
Size:
11.98 Mbytes (12556911 Bytes)
Language:
english
Revision:
Manual ID:
Date:
1977 06 01
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2017 08 07
MD5:
34b6d70dc1d8e0a6104f2484ed4a1f99
Downloads:
929
Information
Serial Number 451 and up
GENERAL
Inti*oduction
Description
Accessories and Options
OPERATION
Controls and Indicators
Operation
Initial Set-up and Calibration Spectrum Measurements Higher
Resolution Audio Monitoring Marker Usage Service or Repair
Preparation for Shipment Operation Notes
THEORY OF OPERATION Introduction
Circuit Reference Series General Description Component
Numbering Cross Reference Functional Description Circuit
Description
RF Attenuator, 2100
First Converter, 2200
Y1G Driver, 3100
Second Converter, 2300
1900 MIIz Oscillator, 2700
Third Converter, 2400
IF Switchabie Gain and Bandwidth, 3200
Log Converter, 3300
Audio/+10V Supply, 3500
Ramp Generator/Deflection Amplifier, 3600
High Voltage Supply, 3700
A/D Converter, 1300
Display, 1200
12V DC Inverter, 3400
MAINTENANCE
General
Performance Check
Test Equipment Required Level Accuracy Frequency Response
Scan Width Functions FM Demodulation AM Demodulation
Adjustments General
Power supply Adjustment
Ramp Generator/Deflection Amplifier Adjustment Frequency
Scan Adjustment Digital Panel Meter Adjustment
PARTS LISTS AND SCHEMATIC DIAGRAMS Parts Lists and Schematic
Diagrams Introduction