Installation Instructions

OM-E 2072-09287-00
1-4
• AB-591 Antenna Base Adapter. The antenna base adapter serves as the main support for the
AT-271A.
A safety strap is supplied to fasten the antenna sections together, when the radio set is transported with
the antenna folded.
1-3.4 FAA5548 Portable Dipole Antenna
The optional FAA5548 dipole antenna is a lightweight portable antenna for the frequency range of 2 to
30 MHz. This antenna is recommended for use during static operation, when long communication
ranges are required: when using a properly selected operating frequency, FAA5548 provides
continuous coverage for communication ranges of up to 1,000 kilometers.
The FAA5548 antenna consists of two antenna wires, which are attached to an insulator (center unit).
The insulator is connected by means of the coaxial feed cable to the front-panel DIPOLE connector.
The length of the antenna wires is coarsely adjusted in accordance with the operating frequency. Two
cords are used to stretch the wires. The cords are fastened to nearby supports, e.g. trees, poles, etc.
When properly adjusted to the operating frequency range, the FAA5548 input impedance is close to
50 Ω, and therefore it is possible to connect FAA5548 directly to the DIPOLE connector of the
Micom. When the selected operation mode involves automatic changing of the operating frequency,
e.g., for ALE operation, the antenna should be adjusted to the average operation frequency.
1-3.5 GPS Antenna, AT-1000 (for Use with Option G421)
The GPS antenna, AT-1000, is a compact active omnidirectional antenna which connects to the GPS
connector of the Micom through a coaxial cable that carries both DC power and the received GPS
signals. The AT-1000 has a threaded stud on its base, which can be used to fasten the antenna to an
appropriate adapter. Figure 1-4 shows a general view of the antenna.
Figure 1-4. GPS Antenna, AT-1000
For use in Micom Pathfinder, the required adapter is AD-1000P, and the coaxial cable is CG-5602.
AD-1000P is used to attach the AT-1000 to the Micom Pathfinder carrying harness. Figure 1-5 shows
a general view of the antenna adapter.
Figure 1-5. GPS Antenna Adapter, AD-1000P
1-3.6 Handset, FMN5501
FMN5501 is a dynamic handset with a noise-suppression microphone complying with MIL-H-49078
(EL). It has a five-pin audio connector for connection to one of the Micom AUDIO connectors.
1-3.7 Loudspeaker, LS-108M (Optional)
The LS-108M is a portable 0.3 W loudspeaker that connects to one of the AUDIO connectors on the
front panel of the Micom. The LS-108M is designed for field combat use, and may be attached to a
belt or harness. It allows a commander to monitor radio communications while the radio operator
remains in full control of the radio set.