HF WIRE ANTENNAS MADE IN GERMANY
HF WIRE ANTENNASMADE  IN  GERMANY

30m Operation with the 404-UL

The SWR of the 404-UL on 30m is too high to use without a matchbox. Of course you can match it on that band with most radio's built-in ATUs.

  

However, if your radio does not have a built-in ATU and you do not wish to carry a big bulky tuner along with you on your portable outing, here is a very simple circuit that will enable you to work 30m, no problem:

Here is the schematic:

  Note: the 510 pF is not critical. 

  A 470 pF capacitor will also work.

 

  I wrapped my coil onto a small

  Toroid, but it may also be a simple

  air-core coil.  Its value should be

  close to 0.5 uH.

SWR CURVE (with Mini-Match)


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