CHA EMCOMM II Deployment Geometry and Site Planning

The wire shape is an electrical decision as well as a mechanical one. Changing one endpoint can change both the match and where the signal goes.

The CHA EMCOMM II V2 is a one-pound, one-operator broadband wire system built for rapid field communication when the station cannot carry a collection of resonant antennas. Its matching transformer and 60 ft insulated radiator pack onto the supplied line winder and can normally be deployed in less than 15 minutes.

What matters for this decision

• Horizontal NVIS: keep the radiator approximately 10–12 ft high; use a 50–55 ft counterpoise or the documented 25–100 ft coax-as-return condition.
• Sloping wire: one support, normally 25–40 ft high, with a recommended 20–40 ft counterpoise or the documented coax-as-return condition.
• Inverted-L: two supports with roughly 18–40 ft of vertical rise and a horizontal remainder; use the recommended 20–40 ft counterpoise or documented coax-as-return condition.

Why operators choose this system

Its value is not one universal pattern. The same 60 ft radiator can be kept low and horizontal for regional NVIS work, raised as a sloping wire for general field coverage, or bent into an inverted-L when the site offers two useful supports.

Published operating reference

• Published continuous frequency range: 1.8–54 MHz.
• Published power: 200 W SSB and 100 W other modes under intermittent commercial/amateur service.
• Published wire length: 60 ft maximum and approximately 35 ft minimum deployed length.
• Published weight and setup: approximately 1 lb; one operator in less than 15 minutes.

Make the next deployment repeatable

Record product revision, configuration, wire dimensions and bearings, endpoint heights, support hardware, return path, coax and choke condition, tuner state, analyzer reference plane, weather, and on-air reports.