Covering the80m–10m bands and frequencies in between, it efficiently transforms a high impedance (~2800 Ohms) at the end of a half-wave radiator to 50 Ohms. Frequency Coverage : 3–30 MHz. In Feet : Length = 468 ÷ Frequency (MHz).
"The common-mode filter or choke may be one of the best-kept secrets" American Radio Relay League Antenna Handbook If you use End Fed antenna aka 9:1 UNUN with a piece of wire, OCF dipole antenna or have any RFI problem, use the best tool to cure it. Great for CB and HF mobile operation. Do not fall for those coiled coax chokes which can make the problem worse in some cases. There is no shortcut when it comes to curing RFI/EMI problems after all Ferrite materials are invented for that purpose. Ferrite turns the RF energy into heat, coiled coax does not! CMC-154-3K Common Mode Choke / Noise Suppressor / Line Isolator / RFI Suppressor Designed by Danny Horvat, E73M -former Cushcraft antenna designer. CMC-154-3K Common Mode Choke / Noise Suppressor / RF IsolatorThe one and only true Common Mode Filter Choke for 1-54 MHz on the market. It is only product with over 7000 Ohms of CMI on 50MHz while maintaining a Resistive part of CMI for more then50MHz of the frequency spectrum, actually, it has same values all the way up to 85MHz.Perfect to cure RFI/EMI problems.Common-mode attenuation is up to 39dB max. (measured in 50 Ohms systems)Great noise suppressor! It is a cure for noisy locations, reduce the noise floor of your receiver by several S-units instantly. If you have unbalanced antenna such as OCF dipole or your antennas close to your home, adding one CMC-154-3K will greatly reduce RF Interference problems on your equipment and 120/220V wiring inside your home. We do not claim "one size fits all" but actually we design, measure and make such products. Our CMC-154-3K has huge Resistive values of Common Mode Choking Impedance from 1-54MHz or almost whole HF spectrum, click the chart in the gallery for actual measurement data. Unlike other companies, we do not claim unrealistic impedance values or frequency coverage. Most importantly, the value of CMC-330-1K Common Mode Choking Impedance and its Resistive (Rs) part is always higher than Reactive part (Xs) over the working bandwidth. This parameter, Rs>Xs ensure that our CMC will NOT increase common mode currents as could with inferior coaxial cable chokes.We do not sell coaxial choke with RG8X cable claiming legal power or even 2000W capability while catalog values for RG8X are only 360W on 28Mhz and only 1kW on 3.5Mhz!!!Only chokes with Resistive (Rs>Xs) CMI- Common Mode Impedance stops and dissipate unwanted RF or noise coming to your equipment for sure. Coaxial chokes are not nearly effective and they are prone to even increase RF on your feeder.CMC-154-3K Features:SO-239 PTFE (Teflon®) Connectors which produce no impedance bump but the continuity of coaxial cable where the choke is inserted, it helps minimize leakage of RF in multi/contest stations setups.PTFE (Teflon®) insulated coaxial cable used can handle a lot more than legal power (1500W) in the USA. It is rated only to 3kW because of cable limit at the 50MHz.The enclosure is UV stable and could be used outside. Frq.(MHz)Zmag(Ohms)Rs(Ohms)Xs(Ohms)1.852500120022003.7370026002500748003800280010.15900525027501465006300170018.165006500700216400640036024.962506250-182861506150-14050.174007300-1100Zmag-Impedance Magnitude Rs-Series Choking Resistance Xs-Series Choking Reaktance *ICAS = Intermittent Commercial and Amateur Service
EFHW-8010-1KW-ICAS Multi-Band End Fed Half-Wave AntennaThe EFHW-8010-1KW-ICAS is a premium End-Fed Half-Wave (EFHW) antenna designed for seamless multi-band operation across the 80/40/30/20/17/15/12/10m bands. Unlike many end-fed antennas on the market, this model requires no antenna tuner, thanks to its resonance on 80m (3.5 MHz) and its harmonics (2nd, 3rd, 4th, etc.).Features and Advantages No Tuner Required: Fully resonant across multiple bands. High-Efficiency Transformer:Designed with two FT-240 (2.4inch dia.) stacked cores for minimal insertion loss.Transformation ratio of ~56:1 (~2800:50 Ohms).Optimized for 3.5–30 MHz with an unmatched average loss of less than 0.6 dB—a benchmark in the market for RF transformers.Worldwide leader in high-ratio, wide-bandwidth transformer design by E73M. Flexible Installations:Can be deployed in configurations such as horizontal, vertical, inverted V, or inverted L. Stealth Design:Constructed with durable, black #18 AWG wire for a low-visibility, weather-resistant installation.Equipped with stainless steel hardware for longevity.Technical SpecificationsFrequency Range: 3.5–30 MHz.Resonant Bands: 80/40/30/20/17/15/12/10m.Power Handling:1 kW I.C.A.S. for voice modes.250W for digital modes such as FT8.Wire Length: ~130 feet.Connector: Silver/Teflon SO-239.Transformer: MEF-330-1KW-ICAS, optimized for 3–30 MHz.Grounding RecommendationsGrounding the coaxial cable at the home’s entry point is highly recommended to protect equipment from electrostatic buildup and prevent electrostatic discharge (ESD).If the transformer box is mounted high above the ground, grounding at the box is unnecessary—ground the coaxial cable instead.Note: Grounding does not affect antenna tuning.SWR PerformanceTypical SWR readings are better than 2:1 when mounted 25–30 feet above ground and fed with 50 feet of RG8X coaxial cable.Perfect for Emergency and Professional UseThis antenna is ideal for ALE HF-Link, NVIS, MARS, ARES, EMCOMM, and similar applications. It’s suitable for both temporary and permanent installations, ensuring reliable communication in critical scenarios.
EFHW-7510-2K-PLUS Multi-Band End Fed Half Wave Antenna- NO TUNER NEEDED!EFHW-7510-2K-Plus, 2000W Multi-Band End Fed Half Wave AntennaImproved version of the EFHW-7510-2K, now with three large cores, 2.9-inch diameter, featuring just 0.5 dB Insertion loss 3-30MHz!This is an End-Fed Half-Wave (EFHW*) antenna for 75/40/30/20/17/15/12 and 10m bands. Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. Due to the High Impedance feed point, the antenna is less height dependent. You can put it up at 10 or 50 feet in the air without much change in VSWR values.*This is perfect antenna for ALE HF-link stations, NVIS, MARS, ARES, EMCOMM etc.Various installations such as horizontal, vertical, inverted V, inverted L, etc. are possible. Your VSWR values could vary with different wire configurations and the height of installation.NO TUNER needed!NO counterpoise needed! (Grounding recommended*)Frequency coverage: 3.5-30MHzResonant on 75/40/30/20/17/15/12/10mWire length ~130 feetPower Handling: 2kW I.C.A.S350W digital modes continuous (FT8, RTTY, etc)Stainless Steel hardwareStealth #14 AWG XLPE black wireConnector: Silver/Teflon SO-239The 2K-Plus model has three large stacked cores *Grounding at the transformer box or end of the coaxial cable is recommended for protection of your equipment from an electrostatic buildup in order to prevent ESD- electrostatic discharge.NOTE: grounding does not affect antenna tuning. If the transformer box is installed high above the ground , there is no need to route the ground wire from the box, instead just ground the coaxial cable at the entrance to your home or at the station.---------------------------------------------------------------------------------------------No guarantee or liability is either expressed or implied pertaining to damages to persons, buildings, or equipment in the installation or use of our antennas. You must use extreme caution when working around power lines. If the antenna were to come into contact with a voltage carrying line it could be fatal.
EFHW-7510-LP EFHW-7510-LP- 250W Portable or Stationary Multi-Band End Fed Half Wave Antenna/ This is a 250W version of the popular EFHW-7510-2K+ End-Fed Half-Wave (EFHW*) antenna for 80/40/30/20/17/15/12 and 10m bands. Featuring an optimized MEF-130-LP transformer with an average insertion loss of only -0.4 dB (~9% loss) compared to similar products on market with insertion loss as high as -1.5dB (~30% loss). Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. Check the 75M band coverage SWR chart below. *This is perfect antenna for ALE HF-link stations, NVIS, MARS, ARES, EMCOMM etc. Various installations such as horizontal, vertical, inverted V, inverted L, etc. are possible. Measured VSWR in the gallery are taken with the antenna horizontal at 25 feet above the ground, your values could vary with the way and height of installation. NO TUNER is needed! NO counterpoise is needed! Frequency coverage: 3.5-30MHz Resonant on 80/40/30/20/17/15/12 and 10M Wire length ~130 feet Power Handling: 250W I.C.A.S Digital Modes, FT8 100W max. Stainless Steel hardware Stealth #16 AWG black wire Connector: Silver/Teflon SO-239 *Grounding of the coaxial cable at the radio side is recommended for the protection of your equipment from an electrostatic buildup in order to prevent ESD- electrostatic discharge. NOTE: grounding does not affect antenna tuning. *Amateur Radio Emergency Service® (ARES), ALE-Automatic Link Establishment (HFlink), MARS-The U.S. Army Military Auxiliary Radio System (AMARS), NVIS EFHW-7510-LP EFHW-7510-LP- 250W Portable or Stationary Multi-Band End Fed Half Wave Antenna/ This is a 250W version of the popular EFHW-7510-2K+ End-Fed Half-Wave (EFHW*) antenna for 80/40/30/20/17/15/12 and 10m bands. Featuring an optimized MEF-130-LP transformer with an average insertion loss of only -0.4 dB (~9% loss) compared to similar products on market with insertion loss as high as -1.5dB (~30% loss). Unlike many END FED antennas on the market, this one does not require the Antenna Tuner to operate. Check the 75M band coverage SWR chart below. *This is perfect antenna for ALE HF-link stations, NVIS, MARS, ARES, EMCOMM etc. Various installations such as horizontal, vertical, inverted V, inverted L, etc. are possible. Measured VSWR in the gallery are taken with the antenna horizontal at 25 feet above the ground, your values could vary with the way and height of installation. NO TUNER is needed! NO counterpoise is needed! Frequency coverage: 3.5-30MHz Resonant on 80/40/30/20/17/15/12 and 10M Wire length ~130 feet Power Handling: 250W I.C.A.S Digital Modes, FT8 100W max. Stainless Steel hardware Stealth #16 AWG black wire Connector: Silver/Teflon SO-239 *Grounding of the coaxial cable at the radio side is recommended for the protection of your equipment from an electrostatic buildup in order to prevent ESD- electrostatic discharge. NOTE: grounding does not affect antenna tuning. *Amateur Radio Emergency Service® (ARES), ALE-Automatic Link Establishment (HFlink), MARS-The U.S. Army Military Auxiliary Radio System (AMARS), NVIS × × × × × × × × × × × × × × Tell a friend Visit store Watch now Postage info Click the Postage tab above the listing description for more info Price: $9.99 (local shipping) See more... USPS Priority Mail - $9.99 USPS Priority Mail International - $45.00 Click the Postage tab above the listing description for more info! Additional delivery notes PICK UP OPTION Sorry, our items are NOT available for pick-up. PAYING VIA PAYPAL We accept PayPal on our all our items so you can shop with confidence. Simple choose the PayPal option when proceeding through the checkout. Additional Information No additional information at this time Ask seller a question You might also like Antenna End Insulator-10 RFI-Kit-2 EFHW-60S-1K SWL antenna Contact To contact our Customer Service Team, simply click the button here and our Customer Service team will be happy to assist. Ask seller a question © Antennas and accessories designed by Danny Horvat, E73M Postage Shipping is a flat rate across US at a rate of $9.99 Payment Accepted Payment Methods PayPal Returns Returns are not accepted Buyer will pay for return shipping. eBay integration by
EFHW-4010-1KW-ICAS Multi-Band End Fed Half-Wave AntennaThe EFHW-4010-1KW-ICAS is a premium End-Fed Half-Wave (EFHW) antenna designed for seamless multi-band operation across the 40/20/15/10m bands. Unlike many end-fed antennas on the market, this model requires no antenna tuner, thanks to its resonance on 40m (7 MHz) and its harmonics (2nd, 3rd, 4th, etc.).Features and Advantages No Tuner Required: Fully resonant across multiple bands. High-Efficiency Transformer:Designed with two FT-240 (2.4inch dia.) stacked cores for minimal insertion loss.Transformation ratio of ~56:1 (~2800:50 Ohms).Optimized for 3.5–30 MHz with an unmatched average loss of less than 0.6 dB—a benchmark in the market for RF transformers.Worldwide leader in high-ratio, wide-bandwidth transformer design by E73M. Flexible Installations:Can be deployed in configurations such as horizontal, vertical, inverted V, or inverted L. Stealth Design:Constructed with durable, black #18 AWG wire for a low-visibility, weather-resistant installation.Equipped with stainless steel hardware for longevity.Technical SpecificationsFrequency Range:7–30 MHz.Resonant Bands: 40/20/15/10m.Power Handling:1 kW I.C.A.S. for voice modes.250W for digital modes such as FT8.Wire Length: ~63 feet.Connector: Silver/Teflon SO-239.Transformer: EFHW-330-1KW-ICAS, optimized for 3–30 MHz.Grounding RecommendationsGrounding the coaxial cable at the home’s entry point is highly recommended to protect equipment from electrostatic buildup and prevent electrostatic discharge (ESD).If the transformer box is mounted high above the ground, grounding at the box is unnecessary—ground the coaxial cable instead.Note: Grounding does not affect antenna tuning.SWR PerformanceTypical SWR readings are better than 2:1 when mounted 25–30 feet above ground and fed with 50 feet of RG8X coaxial cable.Perfect for Emergency and Professional UseThis antenna is ideal for ALE HF-Link, NVIS, MARS, ARES, EMCOMM, and similar applications. It’s suitable for both temporary and permanent installations, ensuring reliable communication in critical scenarios.