Through-line impedance: 50-ohms (nominal) If you want a CHOKE-KIT! with more inductance (more ferrite cores), or with "N" type connectors, or if you want to purchase the cores separately for DC power line filtering and other uses, please ask.Do not use this device to support wire or cable weighing in excess of 10 pounds without a strain relief or the connectors may pull off the cable.The ferrite cores are like any other ceramic material and will crack if handled roughly. UHF connectors are not waterproof by themselves. Be sure to use adequate coaxial waterproofing sealant when using outdoors.The use of high performance materials allows CHOKE-KIT! to provide reasonable attenuation of unwanted RF on coaxial feedlines well into the VHF bands with a minimum of power loss.Įvery effort has been made to ensure years of trouble free operation, however there are a couple things to remember: CHOKE-KIT! will not couple RF into other nearby objects when properly installed. This means less wind loading when used at the antenna feedpoint and less clutter when used at the rig. Five ferrite cores provide inductance equal to over 28 feet of RG-8 coax wound in a nine-turn coil. The secret behind CHOKE-KIT! is the premium ferrite material, which will not saturate under high power and high VSWR. Great for emergency "Go" kits when deploying less-than-optimal antenna installations (no counterpoises, poor grounding). Reducing man-made noise (computers, lamp dimmers, etc) conducted from the shack to the antenna by the feedline.Reducing unwanted RF due to feedline proximity to antenna elements (low height dipoles, etc).Feeding dipoles, loops, or other similarly balanced antennas with unbalanced feedlines (coax).Receiver noise also may be reduced by eliminating signal pick-up by the feedline. Beam antennas, especially, benefit from improved balanced drive and superior feedline isolation, but even simple dipoles benefit from properly selected and installed baluns and Line Isolators. The addition of a Line Isolator or a proper balun can significantly reduce feedline radiation and dramatically decrease RFI and TVI. It does this by providing the antenna with balanced current at the feedpoint and by very effectively preventing the feedline from acting as part of the antenna. Using a Line Isolator in series with the antenna’s feed system can substantially improve the antenna’s front-to-back and front-to-side ratios. It will also reduce RF introduced on the feedline due to close proximity to other radiating sources such as power line noise or other adjacent HF transmitting antennas. It is perfect for dipoles, G5RV's, loops and other installations where the unbalanced coaxial feedline interfaces with the balanced portion of the antenna. "Common-mode" means CHOKE-KIT! will only attenuate or" choke" unwanted RF power present on the coaxial feedline and not affect the RF power you want to deliver to the antenna. CHOKE-KIT! is a quality pre-assembled high power current balun* which provides approximately 24 microhenries of "common-mode" inductive reactance. Do You Have RF Getting Back Into The Shack? Do You Get Bad Audio Reports Because Of RF Getting Into Your Mic? Does Your Rig Act Strange When You Increase Your Transmitter Power? Do You Get "Bit" By Your Mic When Keying The Rig? Then CHOKE-KIT!ĬHOKE-KIT! is a simple and effective way to reduce or eliminate unwanted RF from being conducted back into the shack when installed either near the antenna feedpoint or near the rig, or both.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |