9:1 UnUn 400w

A 9:1 UnUn rated for 400-watts continuous across HF (1.8-30MHz).  This features two stacked FT240 cores for those running high power or that wish to make use of the optional mast-mounting hardware.  Do not be fooled by often cheaper units using smaller FT140 (1.4-inch) toroids and claiming 400-watt capacity!  Our UnUn uses a pair of FT240 (product page here) 61-mix ferrites.

The "standard" 250-watt version is also available.

A top-mounted eye-bolt allows for hanging/tying from a pulley, pole or suitable wall-fixing, a side eye-bolt provides strain-relief for the wire.

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)
• 2x FT240-61 ferrite cores (not iron powder!)
• SO239 coax input and M4 (4mm) terminals for aerial+counterpoise
• 125x85x55mm
• Sealed with potting-compound - fully weather-proof
• All fixings are stainless-steel
• Weight: 450g

We like CB19925 from CPC for our aerial wire.