Bare copper antenna wire stapled directly on wood rafters causes loss of rf signal energy.
Attic swl antenna balun construction.
The attic shortwave antenna wire this is the most importantaspect to improve.
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.
Prior to our move i had been using and trying all kinds of indoor antennas since the early 60s.
I installed my first outdoor shortwave antenna a k a.
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.
Swl antenna back in the summer of 1971.
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.
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.
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.
Loop antenna system with 4 1 balun and choke combo 7 30 mhz 1 5kw pep.
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.
Fig 6 the eco friendly vertical antenna magnetic longwire baluns mlb are found in the section stuff you can use.
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.
The shortwave antenna explained.
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.
Loft attic antennas for restricted spaces m.
What a difference that made.
We had moved from a city apartment to a house that had a big backyard.
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.
Mac af4ps fp 51 note.
Loop antenna system with 4 1 balun and choke combo 7 30 mhz 1 5kw pep.
