9:1 UNUN 1kW 1.8-54MHz for Long Wire Antennas Ham Radio

PLEASE NOTE THAT WE ARE AWARE OF IMPORT CHARGES TO THE US AND CANADA, OTHER COUNTRIES PLEASE CHECK WITH YOUR IMPORT OFFICE. This is a listing for the Sigma Euro-Comm 9:1 UNUN 1kW This provides a feedpoint for a long wire radiating element and converts the impedance from 450Ω (+/-) to something nearer to the 50Ω expected by your transceiver. There are three connections on the UNUN, a SO239 to which you connect the coaxial feed line and two machine screws with butterfly wing nuts. To one of these you should connect the longest piece of wire you have available and to the other you should connect a length of wire to earth. This is a necessary connection as it will reduce static pick up and provide a direct path to earth for any possible lightning strike or build up of static in the air. The best way to do this is to attach a length of wire to a ground rod and fix it to the UNUN at this terminal which is marked with a green label so you are able to identify it correctly. Fix the feedpoint up as high as you possibly can – it may be attached to a pole or to a wall and then attach the other end of the wire to a point as far away as is possible. This is best done if the wire can be kept in a straight line and horizontal but, if this is not possible due to space restrictions, do not despair. The wire may be dog-legged, sloped or fixed in any number of ways to enable it to fit in the space available. The other end of your coaxial cable should be attached to your ATU and then from the ATU to your transceiver. Power up, make final adjustments to tune and away you go. Please use a good quality 50 Ohm coax, RG-213 or Mini 8 are probably the best choice. *1kW power rating is for intermittent amateur radio use (CW or PEP) for data modes (FT-x, RTTY, etc) or constant carrier data modes a lower maximum of 200 Watts is recommended. *If you are using a high-power amplifier it is essential that an external ATU is used between the antenna and the amplifier, otherwise damage may occur.

• WIRE ANTENNA UNUN
• HF