9:1 UNUN 400 Watt High Power 1.8-54 MHz for Long Wire Antennas Ham Radio

Description

• WIRE ANTENNA UNUN
• HF

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 400 Watt. This provides a feedpoint for a long wire radiating element and converts the impedance from 450 (+/-) to something nearer to the 50 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. Please note that due to the varying impedance found on any long wire antenna, the built in ATU in your average transceiver will not be able to cope with all bands. For full band coverage you will need an external ATU or possible some form of capacitive loading system. This can be a simple L or T match. Specifications: Coverage: 1.8 - 54MHz Max input power: 400W CW or 500W SSB * *These power ratings are for intermittent amateur radio use - CW or SSB. For AM or constant carrier data modes the power should be reduced accordingly.

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