Re: Toroid material for QRP HF tuner: "2" or "6"?


Chuck Carpenter
 

Moshe,

I tend to build z-matchers to cover low HF and hi HF. One covers 160 thru 20 meters with type 2 cores. Others covers 40 meters thru 10 meters using type 6 cores.

Also build a few single band versions such as 10 and 6 meters using type 10 cores (black).

I like the designs from Charlie Lofgren, W6JJZ, and find them to have a wide impedance matching range and good measured efficiency.

You can find his designs in ARRL Antenna Compendium #5 and here: http://www.seboldt.net/k0jd/z-match.html

For measurements the AI1H procedure found in QEX for Sep/Oct 2003

and PDF here:

<http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=7&ved=0CDMQFjAG&url=http%3A%2F%2Fwww.nonstopsystems.com%2Fradio%2Fpdf-ant%2Fradio-tuners-baluns.pdf&ei=6v5xVdKqEpawogSct4GABw&usg=AFQjCNF9O06mZxwtcJ3ln-46OgrR_i89PQ>


Chuck Carpenter, W5USJ
EM22cv, Rains Co. TX

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