4:1 9:1 16:1 UnUn 200w

A multi-ratio UnUn for use on HF (1.8-30MHz) with up to 200w RF power.  Sometimes, a single ratio just isn't enough if you're changing bands or out /P with different lengths of wire.  The 3 ratios allow you to easily find a better match to your radio/tuner.  Use of counterpoise/radials is advised.  All fixings are stainless-steel.

• 4:1, 9:1 and 16:1 taps
• FT240-43 Core
• Use with random end-fed wire or vertical
• SO239 coax input and M4 (4mm) terminals for aerial+counterpoise
• 80x85x55mm
• Sealed with potting-compound - fully weather-proof
• Weight: 300g
• PDF Guide - Multi UnUn

Made (and used) by us - Be wary of any supplier who can't (or won't) tell you what's inside the box you buy!

Choosing a Balun
We are often asked "what balun should I use?" by customers - here's our simple guide to choosing the right one:

• Resonant dipole, coax-fed - 1:1 Choke Balun (we have 100w and 400w versions)
• Doublet fed with ladder-line - 1:1 Choke Balun or 4:1 Current Balun (most times, a 1:1 is preferable)
• Random/long-wire down the garden (or up a pole) - UnUn, 9:1 is the common ration, but our model offers 4, 9 and 16:1
• Choking Coaxial Cable - 1:1 Line Isolator