Attic Swl Antenna Balun Construction

I installed my first outdoor shortwave antenna a k a. The infamous attic dipole. With time bare copper oxidizes the wood where the wire is tightly stapled to absorbs some of this oxidization and forms a loose yet lossy bond with the wire.

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The shortwave antenna explained.

Attic swl antenna balun construction.

I tried adding more wires to see if this made any further improvement. The better your antenna the more success you will have making contacts. What a difference that made. Bare copper antenna wire stapled directly on wood rafters causes loss of rf signal energy.

Loop antenna system with 4 1 balun and choke combo 7 30 mhz 1 5kw pep. Satisfactory to use a 1 1 balun 12 bifilar turns on 4 stacked ft240 61 cores see next section on page so that there was less loss when operating into the low resistive component of the antenna input on 80m. We had moved from a city apartment to a house that had a big backyard. Mac af4ps fp 51 note.

Solder a magnetic longwire balun mlb to the wire at the bottom and attach a coax cable between the mlb and your receiver and then mount the antenna as high as possible. Swl antenna back in the summer of 1971. For swl s the most popular is the cmnf 6 available with so 239 f or bnc connectors and simply plugs in line with your coax next to your receiver. Mounting an antenna in your attic is easier to accomplish than putting it outdoors mainly due to not having to drill holes in your roof as well as a shorter cable run to the tv.

Prior to our move i had been using and trying all kinds of indoor antennas since the early 60s. Loft attic antennas for restricted spaces m. Fig 6 the eco friendly vertical antenna magnetic longwire baluns mlb are found in the section stuff you can use. This was installed at a previous qth i will be the first or millionth remember i m from fl to affirm that the antenna is the determining factor for success when it comes to one s station set up.

An attic antenna is more economical than a rooftop installation to maintain and doesn t entail as many potential repair costs as its outdoor counterpart. The antenna comes with a 3 coaxial cable to attach the antenna bnc output to a so 259 pl 259 input of your receiver most receivers. Loop antenna system with 4 1 balun and choke combo 7 30 mhz 1 5kw pep. This antenna spans a tuning range spanning 3 5 mhz through 40 mhz and thus covers 80 10 meters on the amateur radio bands all international shortwave bands plus the 11 meter cb bands.

The attic shortwave antenna wire this is the most importantaspect to improve.