# ETS-Lindgren 3121C Tuned Dipole Antenna Set, 30 MHz – 1 GHz (Pre-Owned) # ETS-Lindgren 3121C Tuned Dipole Antenna Set, 30 MHz – 1 GHz (Pre-Owned) ## Key Features At A Glance - Antenna family spans 20 Hz through 40 GHz across biconical, log periodic, BiConiLog, horn, dipole, loop, rod, and conical log spiral types - Models support EMC emissions, immunity, site validation, and wireless test applications across U.S., European, VCCI, SAE, MIL-STD-461E, MIL-STD-285, and NACSIM standards - Each antenna is individually calibrated prior to shipment with calibration data and a Certificate of Conformance included in the product manual - Calibrations performed at an A2LA accredited calibration site using NIST-traceable equipment - Construction uses high-grade 6061T6 aluminum, with aircraft-grade 2024T3 aluminum on critical components, and powder coat finish on many models - Backed by a two-year materials and workmanship warranty on EMCO brand antennas - Catalog includes accessories: antenna mounts, tripods, support rods, coaxial cables, and ferrite-loaded coaxial cable for measurement system integration The ETS-Lindgren EMCO Antenna Catalog presents a comprehensive family of EMC test antennas covering emissions, immunity, site validation, and wireless test applications. The catalog organizes more than two dozen models by antenna type — BiConiLog, biconical, calculable biconical, log periodic, double-ridged waveguide horn, diagonal dual polarized horn, standard gain and octave horn, tuned dipole, fixed dipole sets, loop and magnetic field coil, rod, conical log spiral — along with shielding effectiveness test kits and a parallel element E-field generator. Together these antennas span an operating range from 20 Hz to 40 GHz. The catalog identifies the EMC test types each model supports. Applications listed include U.S. regulatory emissions testing (FCC-15, FCC-18), European regulatory testing, VCCI, SAE J1113, MIL-STD-461E, MIL-STD-1541, MIL-STD-285, NACSIM, IEC 61000-4-3 immunity testing, IEEE STD 299 shielding effectiveness measurement, and wireless device testing. Each model entry indicates whether it is used for radiated emissions (RE), radiated immunity (RI), plane wave (PW), microwave (M), E-field (EF), H-field (HF), or wireless frequency testing. ValueTronics maintains this manufacturer catalog as a procurement reference for ETS-Lindgren EMCO antenna products that pass through our facility. Our 20,000 square foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois receives, inspects, and processes EMC test antennas under our standard intake workflow before they are released for sale. Maintaining the published manufacturer catalog alongside our inventory lets engineering buyers cross-reference the model number, frequency range, and application matrix against the specific unit they are evaluating from our stock. ## Brand Heritage ETS-Lindgren operates as a subsidiary of ESCO Technologies. The EMCO brand of EMC test antennas covered by this catalog is part of the ETS-Lindgren product line. Older inventory may carry EMCO branding while current catalog references reflect the ETS-Lindgren corporate identity. ## Compare Other Models in This Series The ETS-Lindgren EMCO antenna catalog is a multi-model family organized by antenna type and intended test application. The catalog's Quick Find table groups models by frequency range and indicates which EMC test standards each model addresses — U.S. regulatory, European regulatory, VCCI, SAE, MIL-STD-461E, MIL-STD-285, NACSIM, and wireless. Within each antenna type (BiConiLog, biconical, log periodic, horn, dipole, loop, rod, conical log spiral), the catalog presents two to five sibling models that differ by frequency range, power handling, polarization characteristics, or form factor. Because the catalog spans antenna families that operate over fundamentally different frequency bands and serve different test purposes, model selection is application-driven rather than tier-driven. The catalog's Antenna Selection by Test Type and Antenna Selection by Frequency sections (referenced in the table of contents) guide selection by matching the regulatory test, the frequency range, and the required test type (emissions, immunity, or site validation) to the available models in each antenna family. Each model linked from this catalog reference is its own dedicated product page on ValueTronics with pre-owned-matched pricing. Confirm the specific model, frequency range, and any required accessories — tripod, support rod, calibration documentation — against your test application before placing an order. The catalog distinguishes models within each antenna type primarily by frequency range and intended test type. In the biconical family, for example, the Model 3104C covers 20 MHz to 200 MHz and is positioned for radiated emissions, the Model 3109 covers 20 MHz to 300 MHz for radiated immunity with higher power handling, and the Model 3110B covers 30 MHz to 300 MHz for emissions. In the log periodic family, the Model 3144 spans 80 MHz to 2 GHz, the Model 3147 spans 200 MHz to 5 GHz, and the Model 3148 spans 200 MHz to 2 GHz with a design oriented to CISPR 16-1 cross-polarization measurement requirements. The double-ridged waveguide horn family is similarly tiered by frequency band: Model 3106 covers 200 MHz to 2 GHz, Model 3115 covers 1 GHz to 18 GHz, and Model 3116 covers 18 GHz to 40 GHz. The conical log spiral family includes Model 3101 (200 MHz to 1 GHz), Model 3102 (1 GHz to 10 GHz), and Model 3103 (100 MHz to 1 GHz). The Quick Find table at the front of the catalog and the spectral chart in the reference section show the full frequency coverage and test-type applicability for each model so the appropriate antenna can be selected for the specific test. Model Antenna Type Frequency Range VSWR (Avg) **3121C** Tuned Dipole 30 MHz – 1000 MHz < 1.6:1 3140 BiConiLog 26 MHz – 2 GHz 2.0:1 3142B BiConiLog 26 MHz – 2 GHz 2.0:1 3104C Biconical 20 MHz – 200 MHz 2.8:1 Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below. ## Accessories Supplied - Four element extension rods - Two low-frequency adjustable elements - Two medium frequency adjustable elements - Four baluns: DB1 - DB4 - Clamp block - Support rod - Base drilled for 1/4 in x 20 tripod - One 5 meter tape measure - One high frequency ruler for DB4 - 7.6 m cable (25 ft) with Type N connectors - Manual with calibration factors and signed Certificate of Conformance - Carrying case ## Product Core & Specifications Parameter Value Frequency Range 30 MHz – 1000 MHz (special calibrations available to 25 MHz) VSWR Ratio (Avg) < 1.6:1 Balun 1 Range / Max Continuous Power 30 MHz – 60 MHz / 260 W Balun 2 Range / Max Continuous Power 60 MHz – 140 MHz / 160 W Balun 3 Range / Max Continuous Power 140 MHz – 400 MHz / 80 W Balun 4 Range / Max Continuous Power 400 MHz – 1000 MHz / 50 W Impedance (Nominal) 50 Ω Connector Type N female Width (max extension with elements) 5.2 m (17.0 ft) Depth 55.0 cm (21.6 in) Balun Thickness 7.0 cm (2.75 in) Boom Thickness 3.5 cm (1.38 in) Weight 9.5 kg (21.0 lb) **Important:** All Conical Log Spiral Antennas have been dropped from MIL-STD-461/2D. They are still acceptable for testing conducted to earlier versions of this specification.**Important:** Two-year materials and workmanship warranty on EMCO brand antennas.**Important:** All Conical Log Spiral Antennas have been dropped from MIL-STD-461/2D. They are still acceptable for testing conducted to earlier versions of this specification.**Important:** Antennas are individually calibrated prior to shipment at the A2LA accredited calibration site. A Certificate of Conformance, verifying the authenticity and accuracy of the calibration, is included with each antenna.**Important:** For Model 3140: 750 W maximum recommended below 60 MHz.**Important:** For Model 3142B: 300 W maximum recommended below 60 MHz.**Important:** For Model 106572 (3142B with end plates): 500 W maximum recommended below 60 MHz.**Important:** Model 3104C may be used for radiated immunity measurements provided that the input power is limited to no more than 100 W peak.**Important:** Tripods and antenna mounts are sold separately for most models — see Accessories section page 62-63 for compatible mounts.**Important:** Annual recalibration is recommended to ensure reliable and repeatable long-term performance. Contact EMCO/ETS-Lindgren to receive an RMA number prior to sending an antenna for calibration.**Important:** Special calibrations for Model 3121C are available to 25 MHz (frequency range below standard 30 MHz – 1 GHz).Recommended pairing: pair tuned dipole and biconical antennas with the Model 4-TR or Model 7-TR tripod listed in the catalog's accessories section to support standard EMC test setups with the 1/4 in x 20 thread mounting interface used across the antenna line. ## About this used unit - Warranty included - Functional verification included - Note that unnecessary accessories may not be included (contact Test Architect to confirm). **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 0.0 USD - **Vendor:** ETS-Lindgren - **Type:** Accessory - **Tags:** Antenna, Dipole, EMCO, Manufacturers, Other Equipment, product_manual_group_1, Product_used ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 0.00 USD | In stock | ## Images - ETS-Lindgren 3121C Tuned Dipole Antenna Set, 30 MHz – 1 GHz (Pre-Owned) --- > Source: [ValueTronics](https://valuetronics.com/products/3121c-emco-dipole-antenna-used) > Updated: 2026-05-30