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1:1 Current Balun 1.2kW 1.2kw watts 72MHz K Material so239 - so239
£48.00 inc. tax
sorry no overseas shipping  .

New for 2017 K material

This is an improved design by Jerry Sevick W2FMI.

This material is the only one that will withstand permanent damage due to high swr and high power these cores are expensive expect to pay £20 each for these if you can find one jerry sevick sites this balun 4kw pep built using only the materials he chooses and methods in design.

This is the version for or so239 to SO239 INLINE see other listing for other options
As good as it can get designed to have a maximum dip of 40 db. Yes that 100x more choking than some baluns for sale on eBay.

Tvi a problem? or you want maximum output from your antenna not your coax.

Common mode current on you coax? Kill it dead with this well designed 1:1 current choke balun.
  • Absolutely top quality now with so239 to so239 sockets.
  • Ptfe heat resistant wire wingdings silver plated twin 100 ohm impedance in parallel .(very expensive aircraft quality)
  • Teflon high temp tape covering all the core.
  • Giving a Perfect match >60 mhz.
  • With a maximum common mode choking available over 35db even on the low bands.
  • Efficiency of 99.999 % for even higher power handling go to Ntype. Sockets. (£6)

Do not buy any balun without knowing the choking attenuation in dB.

Reason = Most baluns sold on ebay and Radio stores simply have less than 2 dB common mode attenuation

Don;'t buy without getting any performance data and not swr curve. The only function for a 1:1 is common mode suppression so it's crucial you know what the figures are!

 Set up with a spectrum analyzer with tracking generator for maximum performance and minimum losses.

The core does not contact any of the case with plenty of air flow around the windings.

Good for Power levels of around 1200 watts with so239 ntype connector. (£4 each).

Ideal for spider beams, dipoles, yagi beams, quads and almost any other antenna you can think of!

Can be added to any other balun you already have, ie 4:1 balun and a must to any 9:1 balun these baluns have zero to 0.02db attenuation.

Stop RF in the shack now... Stop hiding from the neighbours...!

The best on ebay we have the data figures to prove it... dont take my word on it watch this Youtube video by TRX Bench on baluns:

(You'll be shocked)

Regardless of the antenna you're using, an isolation balun can provide numerous advantages:
  • Preventing unwanted RFI by eliminating feedline common mode currents and radiation.
  • All power goes to the antenna, improving efficiency.
  • Power is balanced between driven elements of antenna.
  • Can help overcome a less than optimal ground.

Warning a 1:1 balun should never be used on its second harmonic ie a half-wave center-fed dipole fed with any coax (open line is ok) like an 80 meter dipole being used on 40 meters. The impedance can be 7000 ohms or greater creating very high voltages which can bring about voltage breakdown and/or excessive heating.

Damage to most baluns will be permanent as it alters the magnetic properties of most cores the K type will survive this however your amplifier may not!

An antenna tuner, transmatch , doesn't really TUNE your antenna OR ANY PART OF IT!
What an antenna tuner or transmatch does do, is transform the impedance at the antenna feed output at the radio to a value that your transceiver can handle, (typically 50 Ohms).
When thinking about antenna tuners and SWR, it's important to remember that the tuner has no effect whatsoever on the SWR between itself and the antenna.
It is the SWR between the transmitter and the tuner that is changed with the tuner controls.

If you are intending to use a atu at the radio end ...think again .... you can be a much bigger signal just by improving your system matching no needs for any tuner at the radio end .. think big big.
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