EMCOMM II V2 · Wire Antennas A wire radiator or wire antenna system for documented horizontal, sloping, inverted-V, inverted-L, dipole, or NVIS use. Why operators make room for it Put useful wire in the air without carrying a permanent tower A field site may offer height, distance, or concealment—but rarely all three in exactly the right places. That is where CHA EMCOMM II V2 enters the kit. The EMCOMM II - V2 Antenna Kit has been specially designed for backup emergency HF system or permanent installation. The integral broadband impedance matching network (transformer 5:1) allows broadband antenna tuning. That flexibility gives an operator a credible path from a compact field kit to a full-size radiator, while the official configuration still governs feedpoint, support, tuning, and safety choices. Quick product reference Key Specifications Product type Wire Antennas Primary role A wire radiator or wire antenna system for documented horizontal, sloping, inverted-V, inverted-L, dipole, or NVIS use. Frequency 6M - 160M Power 200W SSB or 100W CW or 50W DIGITAL (5:1 UNUN) Length 60’ Tinned Copper KEVLAR PTFE (Teflon) (-70°C to 150°C) wire Weight 2.12 Lb. Swr Subject to frequency and configuration, see red (bottom) line in Published package contents 1 X CHA EMCOMM II V2 matching box 1 X 60' Tinned Copper KEVLAR Wire Deployment role Documented wire-antenna configuration Support requirement Height, insulation, load, and guying depend on the completed deployment Operator decision support Plan the complete setup See what this product is best suited for, what the documented setup needs, and the boundaries to confirm before deployment. Best for A field site may offer height, distance, or concealment—but rarely all three in exactly the right places. What’s included 1 X CHA EMCOMM II V2 matching box 1 X 60' Tinned Copper KEVLAR Wire What else you need Wide range antenna tuner or coupler Flashlight Multi-tool Throwing weight and string SWR Power Meter Multi-Meter Limitations Carefully roll (do not twist) the Coaxial Cable. Replace assemblies that do not pass a continuity check. Power: 200W SSB Phone, 100W All Other Modes Intermittent Commercial and Amateur Service (ICAS) Note: Prolonged transmissions or exceeding power specifications may damage antenna components. Expansion options Counterpoise Kit 50’ Paracord and Line Winder Assembly Coaxial Cable Assembly. 50 feet of RG-58 with integrated RFI Choke RF Choke Assembly Official product documents Document status: available from current Shopify product record Controlled manufacturer archive: EMCOMMII_V2_User_Guide_240317.pdf · match confidence: high. Open documentOpen product handbook What an operator can do Select a documented horizontal, sloping, inverted-V, inverted-L, dipole, or NVIS arrangement. Raise the wire with a support that satisfies the antenna guide's height, load, insulation, and guying limits. Keep balanced dipole configurations symmetrical and do not add radial or counterpoise accessories unless the guide explicitly requires them. Balanced-system rule: Do not add radial or counterpoise accessories to a dipole configuration unless the official guide explicitly requires them.Complete product details The EMCOMM II - V2 Antenna Kit has been specially designed for backup emergency HF system or permanent installation. The integral broadband impedance matching network (transformer 5:1) allows broadband antenna tuning. It is the perfect backup antenna for apartments, condominiums, homeowners associations, deed restrictions and CCRs (Covenants, Conditions & Restrictions), ARES, RACES, MARS, EMCOMM, NVIS, First Responders and especially for Emergency Preparedness. The unit is water resistant. The antenna wire is 60’ long and covers 6M to 160M. An external tuner might be required depending on the configuration chosen. The antenna will perform very well as a sloper or an inverted “L” configuration. For a NVIS operations (40M – 80M) the antenna must be installed horizontally with the ground and elevated between 9’ and 12’ high. The EMCOMM II - V2 Antenna does not required any ground-plane but will perform better with one. A ground terminal is available for that purpose. Specifications: Frequency: 6M - 160M Power: 200W SSB or 100W CW or 50W DIGITAL (5:1 UNUN) Length: 60’ Tinned Copper KEVLAR PTFE (Teflon) (-70°C to 150°C) wire Weight: 2.12 Lb. The antenna system consists of: 1 X CHA EMCOMM II V2 matching box 1 X 60' Tinned Copper KEVLAR Wire Sloper Installation The sloper may exhibit some gain in one direction, but usually has omni direction pattern. There are two types of sloper, the full sloper, really a dipole mounted with one end higher than the other. The half-sloper (EMCOMM II) is fed at one end with a “ground system” or counter poise provided by either physical ground if fed at lower end of sloper. If the sloper is fed at the top, then other factors provide the “ground”. In most cases, a sloper mounted on a tower, then the tower and importantly, the beam mounted on top, act as the counterpoise. One successful version of the sloper (most folks call any kind of sloper simply a “sloper” regardless of its type) is one that is fed with coax. The antenna is fed from the top and installed on a tower with a beam on top. The center conductor of the coax feeds the sloper wire and the shield is carefully bonded to the tower structure. In addition the beam, rotor, and mast are electrically bonded to the tower (here a heavy braided strap connecting the mast to the tower is recommended). The theory is that the sloper is fed at the top and the high current point is high just under the beam, leading away from the tower. Inverted "L" Installation This is most likely the least expensive high performance antenna you can erect for 40M, 80M and 160M (limited performance). It is worth investigating since it needs only one high point in the relative clear to be effective (the horizontal far end can be at a lesser elevation, details later). Most likely you will need to use an external antenna tuner. The main radiating component of the “L” is the vertical wire, that’s what makes it a very good ground-wave and DX antenna. So it would be good if this can be kept in the clear, or several feet away from your tower, and of course, as high as you can make it. The horizontal part may slope downward, or bent several times to accommodate any obstacles. Keep in mind, the more you bend the element back on itself, the more of the radiated signal is canceled out. Sometimes it is not possible to have the vertical section longer than the horizontal section. This will result in more of the signal being radiated skyward to which NVIS (Near Vertical Incident Skywave) will occur. NVIS is a propagation method that provides usable signals in the range between ground wave and skywave distances (usually 30 to 400 miles). Before we go any further, this antenna requires a robust ground system. If your ground is poor, the antenna efficiency will be poor, and you will be troubled with RF in the shack. The radiation pattern is omni directional, with a possible minor lobe in the direction of the horizontal portion. ***
