AM-741R Active Monopole Antenna

Features

• ▸ Low-frequency E-field measurements — designed for radiated emissions testing across 9 kHz to 30 MHz, with usable performance up to 60 MHz, addressing the band where dipoles and biconicals are impractical.
• ▸ Telescoping rod element — removable, adjustable from 23 cm to 105 cm to support both the 104 cm rod height required by MIL-STD-461 and DO-160, and shorter rod lengths for special applications.
• ▸ High-input-impedance matching network — built-in matching network handles the high source impedance of the short rod element and converts it to a 50 Ω output for direct connection to spectrum analyzers and EMI receivers.
• ▸ Integrated low-noise preamplifier — preamplifier gain is included in the antenna factor, so no separate gain correction is required during measurement post-processing.
• ▸ Wide dynamic range — 103 dB at 1 MHz (1 kHz bandwidth), enabling measurement of weak emissions and strong fields without compressing the receive chain.
• ▸ Battery-powered with rechargeable NiMH pack — 6 VDC NiMH battery delivers 10–12 hours per charge, isolating the measurement from power-line ground loops; supplied charger doubles as an AC power adapter.
• ▸ Front-panel diagnostic indicators — dedicated LEDs for power, RF on/off, battery low, amplifier saturation, charging status, and remote-link state.
• ▸ Optional fiber-optic remote interface — pairs with the Com-Power RAI-100 to enable/disable the RF circuit and monitor saturation and battery status remotely — essential for shielded chamber operation where the operator cannot access the antenna during the test.
• ▸ MIL-STD-461 grounding compatibility — supports the latest MIL-STD-461 grounding arrangement (cable-shield grounding via a metallic bracket and ferrite) using the optional AMS-741 Grounding Kit, as well as the “classic” counterpoise-bonded arrangement of older revisions.
• ▸ ECSM calibration method — calibrated using the Equivalent Capacitance Substitution Method per ANSI C63.4, SAE ARP-958, and CISPR 16-1-4, with a 10 pF capacitor substituting for the rod to provide repeatable, traceable measurements.
• ▸ Standard tripod mounting — 1/4"-20 threaded hole on the bottom of the amplifier housing for tripod or mast mounting; compatible with the Com-Power AT-220 Tripod.
• ▸ NIST-traceable calibration included — individually calibrated; calibration data and certificate ship with every unit; ISO 17025 accredited calibration available on request.
• ▸ Three-year standard warranty — backed by manufacturer support.