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General| Brand | Ramsey Electronics |
|---|---|
| Model | COM 3 |
| Category | Monitor |
| Language | English |
Lightweight, compact service monitor for AM/FM transceivers, ideal for field use due to portability and minimal warm-up time.
Detailed technical parameters including frequency range, RF output, spectral purity, reverse power protection, and modulation capabilities.
Lists available optional accessories like high stability timebase, 12 VDC cigarette plug, travel case, and protective front cover.
Information on contacting customer service for custom modifications to meet specific needs.
Instructions for checking the unit for shipping damage and saving packaging materials.
Details on power sources (117 VAC, 12 VDC) and operating temperature range (0-50°C).
Description of the front panel, membrane switches, keypad, and display functions.
Steps for powering up the unit and generating RF frequencies.
Explains FM/AM modulation, CTS tones, and internal/external tone sources.
Instructions for saving and retrieving up to ten different test configurations.
Procedures for using the COM 3 as an RF frequency counter off-air and via direct connection.
Steps to measure transmitter frequency accuracy and FM deviation.
Procedures for measuring receiver sensitivity using 20 dB quieting and 12 dB SINAD measurements.
Describes the COM 3's overall architecture using three phase-locked loops.
Explains the function and components of the 506-1017 MHz coarse loop PLL.
Details on FM/AM modulation, 1 KHz source, and the receiver's signal path.
Explains power supplies, transmit protection, membrane switch, and microprocessor functions.
How to obtain warranty service, including obtaining an authorization number and return shipping instructions.
Conditions under which the warranty is voided, such as misuse or unauthorized alterations.
Procedures for checking sensitivity and output level flatness across various frequencies.
Verifying monitor functions (FM/AM) and counter capabilities (AF/RF).
Testing RF generation and modulation parameters like FM deviation and AM modulation percentage.
Verifying battery charge rate and overall physical condition of the unit.
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