9:1 UnUn 250w

A 9:1 UnUn for use on HF (1.8-30MHz) with up to 250w RF power. A good starting point for a 14-30MHz solution is around 6.5-7m of wire up a non-conductive pole with a few radials approx 5m each.  Experimentation with both may affect (or improve) performance.

Do not be fooled by often cheaper units using smaller FT140 (1.4-inch) toroids and claiming 400-watt capacity!  Our UnUn uses an FT240 (product page here) 61-mix ferrite.

A QRO version, part of our "Elite" range, is also available.

USE WITH : Random length end-fed wire/vertical - or see our End-Fed Halfwave Coupler if you want a resonant (and a potentially multi-band, no-tuner) solution.

• 9:1 ratio (450>50-ohms)
• FT240-61 ferrite core (not iron powder!)
• SO239 coax input and M4 (4mm) terminals for aerial+counterpoise
• 80x85x55mm
• Sealed with potting-compound - fully weather-proof
• All fixings are stainless-steel
• Weight: 300g

We like CB19925 from CPC for our aerial wire.