Ramsey Electronics COM 3 Communications Test Set
Manufacturer:
Model:
COM 3
Date:
1987
Class:
Type:
SubType:
Communications Service Monitor
Information
The
COM 3 is a lightweight, compact service monitor for
testing AM and FM transceivers. The internal battery, which
is a standard feature of the
COM 3
combined with the
optional carrying case and low weight (13 lbs), make it
ideal for field use. Utilizing specially designed micro
powered oven circuits, warm -up time is minimal, providing
maximum use of the battery.
The frequency range is 100 KHz to 999.999 MHz in 500 Hz
steps. Standard CTS tones as well as a 1 KHz tone can be
generated. RF power is continuosly variable in five ranges
from 0.1 ¡iv to 10,000 ¡j.v. The display is a seven digit
LED type which will display frequencies generated or
received, CTS off air, as well as being an audio and RF
frequency
Counter. Deviation and frequency error are
displayed on a 20 segment LED bargraph, which is easily
visible from across the shop.
An internal RF relay switches transmitted power greater than
500 mW to a rear panel mounted BNC connector. This protects
the
COM 3 from accidental keying and allows easy connection
of an antenna, power meter, or dummy load.
User Manual with schematics
Manual type:
User Manual with schematics
Pages:
37
Size:
9.35 Mbytes (9806215 Bytes)
Language:
english
Revision:
1.7
Manual-ID:
Date:
1987 01 01
Quality:
Scanned document, all readable.
Upload date:
2017 02 04
MD5:
7400a59ce6edc31a90a0b6f39aa4615b
Downloads:
1069
Information
Section 1 - General Information
1.1 Introduction
1.2 Specifications
1.3 Options
1.4 Special Modifications
Section 2 - Installation
2.1 Introduction
2.2 Unpacking and Inspection
2.3 Power Requirements
2.4 Enviromental Considerations
Section 3 - Operation
3.1 Introduction
3.2 Front Panel Description
3.3 Initial Turn On
3.4 Generate RF
3.5 RF Output Level
3.6 FM Modulation
3.7 AM Modulation
3.8 CTS Tone Generation
3.9 1 KHz Internal Tone
3.10 External Source Input
3.11 Combining CTS and Internal/External Tone Sources
3.12 Offset+/Offset-
3.13 500 Hz Step
3.14 Storing/Recalling Test Setups
3.15 Spurious Signals
3.16 Leakage
3.17 Audio Count Off Air
3.18 Audio Count External
3.19 RF Count
Section 4 - Typical Test Setups
4.1 Introduction
4.2 Frequency
Counter : Off Air
4.3 Frequency
Counter : Direct Connection
4.4 Frequency / Deviation Measurements
4.5 20 dB Quieting Measurement
4.6 12 dBSinad Measurement
5.1 General
5.2 512-1018 MHz Coarse Loop PLL
5.3 5-7 MHz Fine Loop PLL -
5.4 1024 MHz Offset PLL
5.5 Output Step Attenuator
5.6 4 MHz Reference Standard
5.7 FM Modulator
5.8 AM Modulator
5.9 1 KHz Source
5.10 Receiver
5.11 16 KHz Reference
Generator
5.12 Frequency Error Detector
5.13 Audio Amp
5.14 + 30 Volt and -10 Volt Supplies
5.15 Transmit Protection Circuit
5.16 DC Supply and Battery
5.17 Membrane Switch
5.18 Microprocessor
5.19 Display Drivers
5.20 Audio Frequency
Counter
5.21 RF Frequency
Counter
5.22 CTS Tone Generation
5.23 Frequency Error/Deviation Display
Section 6 - Documents,Figures
Fig 3.1 Front panel layout Fig 4.1 Block diagram Schematic
diagram Warranty Test data
Comments
STuart