delara newsDelaware Amateur Radio Association, Delaware OH VOL 37 NUMBER 11
The Magnetic Loop - by hand!
Richard Robbins, WA8RRI joined DELARA last week..been a ham for a year and half. I have an ICOM 7300 and a long wire chameleon. Several 6 meter antennas and a 2M/70cm antenna in the attic.I spend most of my time on digital modes. ( not cw ).I started playing with magnetic antennas after reading an article. I don’t think magnetic antennas will displace my current antenna..However when we go to the Florida condo, it might provide a suitable alternative.I called a local refrigeration company and they supplied a 10 foot piece of ¾ inch copper…I did a poor job of making a circle…however not sure perfect makes a big difference. I found a variable capacitor at the Columbus ham fest…$5.I put the thing together and along with a simple drive loop and with my RigExpert got a resonance in the 20 meter band. The antenna will handle 100 watts.Using PSK reporter, the antenna seems to reports from north and south America and northern Europe. I have made a lot of contacts…FT8.Since tuning is an issue, I found a two channel remote on Amazon so I could drive a small motor forward and reverse. Found a small PWM motor controller so I could fine tune the antenna from the basement.I would like to rebuild the antenna..I am looking for 10 foot 1 or 1 ½ inch copper tube preferably bent into a circle. ( I understand that if you fill the tube with sand, it will eliminate kinks. )Any assistance would be appreciated.I included a picture of the antenna in its current state…It won’t win a beauty contest…but the other picture shows the nice SWR for FT8 on 20 metersWA8RR