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Details about  DUAL RATIO TRANSMITTING HF UNUN 9:1 & 4:1 1.8-30 MHz 450W -8/90

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DUAL RATIO TRANSMITTING HF UNUN 9:1 & 4:1 1.8-30 MHz 450W -8/90
Item Ended
Item condition:
02 Aug, 2013 07:38:15 BST
Will post to United States. Read item description or contact seller for postage options. | See details
Item location:
Halifax, West Yorkshire, United Kingdom

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Last updated on  06 Jun, 2013 19:32:21 BST  View all revisions
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Item specifics

New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is ... Read moreabout the condition


  • T183-8/90 toroid coated with epoxy paint for extra durability.
  •  A dual ratio 9:1 & 4:1
  • Design 1.8-30MHz 
  • Power rating 450 W SSB
  • Windings of trifilar enameled wire.
  • Insertion loss is < 0.6dB (measured on miniVNA)
  • SO-239 connector
  • All hardware is Stainless Steel
  • The unun is installed in a weatherproof 90mm X 75mm X 40mm IP65-ready box, that are excellent for outdoor installation when a lid is sealed. (photo as an example only)
  • Winding connections information included. on request

more info 

9:1 UNUN is great for LONG WIRE antenna, just use random length of wire (some lengths are better covering all bands ie 21m or 42m). Long wire is a directional antenna, and is radiating in the same direction as wire is directed. More info in the Internet...
When you have a limited time or length of wire, just use 4:1 UNUN and work on a broadband antenna with out any gaps (known as a Rybakov)

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