Micom 3T Operations Instructions download pdf (Page 20)

MICOM-3F/3T/3R HF-SSB Owner’s Guide

MICOM-3 HF-SSB Radio Features

• Digital Signal Processing (DSP)

• Built-in Test Equipment (BITE)

• RF power indications

• 200 channel capacity, simplex or half-duplex

• Channel scan or Automatic Link Establishment (ALE) per MIL-STD-188-141B/FED-STD-1045

• MultiNet function for seamless integration of different HF radio networks in one network

• Automatic IF shift

• Clarifier

• Voice-activated digital squelch

• Excellent transmitter and receiver performance

• High frequency stability option

• DSP software can be upgraded to incorporate future options and new technologies

• Large LCD display and optional support for multiple languages

• MIL-STD-810C, D and E compliance.

Transmitter Features

The maximum output power of the transmitter is 125 W PEP (Peak Envelope Power). The average

transmission duty cycle is up to 1:4, thus enabling even CW (Continuous Wave) signals to be

transmitted at the maximum available power. Output power can be preprogrammed to one of four

levels: 25W, 62.5W, 100W and 125W. Accurate sensors are used to keep the output power at the

selected value.

The transmitter includes thermal protection. If, for any reason, the transmitter internal temperature

exceeds the maximum permitted temperature, the output power is automatically reduced to avoid

any fault due to excessive heat. Antenna mismatch protection is also included. If the VSWR (Voltage

Standing Wave Ratio) rises to more than 2:1, the transmission will be inhibited to avoid damage and

a message will be displayed.

Receiver Features

The radio utilizes digital signal processing for implementing most of the receiver functions, e.g.,

demodulation, narrow band filtering, automatic gain control, noise blanking, tunable notch filter,

squelch, etc. An automatic digital noise blanker is activated whenever repetitive noise (e.g., ignition

spikes) is encountered in the received signal. The digital syllabic (speech identifier) squelch is

activated whenever speech is identified, thus opening the audio path. However, if speech is not

received, the audio path is muted, thus preventing background noise from disturbing the operator.

Frequency Sources

Two types of frequency sources are available for the MICOM-3 radio. The standard 0.6 ppm DTCXO

frequency source which assures a frequency accuracy of better than ±18 Hz. For frequencies lower

than 10 MHz, it assures a frequency accuracy of better than ±6 Hz. When higher frequency accuracy

is required, the G112 0.1 ppm OCXO frequency source can be ordered. It will assure a frequency

accuracy of better than ±3 Hz at 30 MHz.

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Micom 3T Operations Instructions Page 20