40 Meter Dipole.wmv
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When building a simple half-wavelength 40 meter dipole -- it is always best to be LONG in your length, which you can easily shorten. It is HARDER to add length to a dipole and maintian overall strength.
BTW, why not build a 40 / 15 dipole ?
a 1/2-wavelength dipole cut for 7.1 MHz .. is a 3/2-wavelength at 21.3 MHz (15 meters). Novices did this in 1950s-1970s all the time -- and majority fo antenna tuners on modern solid-state rigs can handle that tuning !!
w9gb 4 months ago
To be sure if your antenna is resonating at 7.3 MHz and you wanted it to working at 7.2 MHz., You need to add on to your calculated length to bring down the resonance by 100 KHz. ? Or did I hear you wrong on the video shot ?. Confused.?.
73 de John.
JohnMC894 6 months ago
nice! thanks for sharing that!
ricoco750 1 year ago
that looks like a good antenna. I was thinking of building this antenna to use with my IC-703+ QRP rig because it looks like light enough to go portable with and just carry it all in my backpack. How low did you get the SWR? How efficient is it really? It would be nice to see another video showing this.
nearadyn 1 year ago