Black Beauty HD (Heavy Duty) 160-40. Is a Next-Generation Common Mode Choke. That is optimized for the lower portion of the HF spectrum from 160m up through 40 meters. It provides more Common Mode Rejection (CMR) in that range than wideband chokes that cover the whole spectrum. It provides 53 dB of CMR on 80 meters, 50.7 dB on 160 meters, and 44 dB on 40 meters. Black Beauty chokes are ventilated to keep the ferrite core cool. This allows it to handle 80% more power than a sealed unit. You can run 2600 watts on FT8 continuously on any of these three bands. Common Mode Chokes stop RFI, reduce receiving noise, increase your signal strength, and preserve the natural radiation pattern of your antenna. They are important to the proper operation of just about any antenna system, especially the widely popular End Fed Half Wave (EFHW), End Fed Long Wire (EFLW), and Multi-band Vertical antennas. Even the venerable balanced dipole becomes unbalanced when fed with coax and generates common mode current. This current runs back down the coax to the rig and causes RFI and unwanted radiation. The coax shield also picks up noise from local electronic devices, such as appliances, power supplies, and LED lights. Black Beauty HD 160-40 cures these problems. We use the highest quality components, from. Request a full datasheet. RF chokes and transformers get hot, so why are they in sealed enclosures? Black Beauty HD 160-40 is ventilated to ensure superior core cooling, unlocking the true potential of your antenna system. With a cooler core, Black Beauty HD retains its choking ability even as you run high power. Black Beauty chokes handle 80% more power than sealed units of the same size. Enjoy the Cool Advantage! Here’s the bottom line on Power. Here is the Common Mode Rejection Ratio(CMRR). Risk-Free Trial: We give you a 30-day right to return the product for any reason. 44 to 53 dB of Common Mode Current Rejection?? Optimized for use between 1.8 MHz and 7.3 MHz?? Superior Cooling due to VENTILATION?? Performance specifications are subject to +- 20% tolerance due to variations in the ferrite material. Ground can be connected to the choke on either the antenna side or the rig side. Maximum applied power may need to be de-rated if common mode current is especially high in your antenna system. Enclosure is designed to be rigidly mounted to a wall, fence, or post. Do not hang the choke from the coax leads.