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#1 2010-01-08 13:17:45
my 'sternzwirn' 13.56 MHz antenna
I've made a HF antenna using a commonly available coil former that is available by raiding your mother or wife's sewing basket 
This uses the 'sternzwirn' cotton reel which is a popular cotton supplier here in Hungary and I believe the rest of Mitteleuropa :-) google 'sternzwirn' and you'll find suppliers of this reel for around 1-2 Eurotokens.
Take a hirose connector stripped from a cable and tinned like so -
Attach the wire to the eyelet (this is from the hirose cable) -
Wrap around the lugs, weave around, up and down, around and around (4 complete turns) and solder to the hirose connector add a blob of hotglue and electrician's tape for cosmetic appeal -
Enjoy your antenna, it gives very good results and the whole antenna is sturdy and doesn't lose the shape.
-- pytey
Last edited by pytey (2010-01-08 17:42:30)
#3 2010-01-08 18:29:45
Re: my 'sternzwirn' 13.56 MHz antenna
pytey, this sure looks great. Could you give us some measurements ?
1) How good does the antenna register with tune ?
2) What is your C35 capacitor value (47pF or 100pF) or if you don't know, where did you get your board from ?
3) What is the diameter of the coil ?
