160 Meter Inverted L Matching

Devilishly that electrical quarter wave of rg213 will make an efficient 20 35 ohm r at the antenna appear as a gone wild 125 72 ohms in the shack. A true wave would be 132 5 feet in length i use the true and tested formula of 1005 freq in mhz length in feet 1005 1 900 mhz 529 feet which i multiplied that length by 3 8 s or 375 529 x 375 198 4 feet. Definitely more entertaining than the lifetime channel.

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Let s look at a very simple solution that i think is the most useful and most elegant solution to use.

160 meter inverted l matching.

Picture of w4kaz 160m matching network and transformer junction box in use with 155 foot long inverted l and k2av fcp the present so what of it. 160 meters separates the men from the boys see you there. An efficient 160 meter inverted l will have a feedpoint with a natural 20 35 ohm r where x 0. Winding an fcp isolation transformer why isot that way iso xfmr options fcp project.

Try it out the inverted l is as cheap as it gets and will give you a horizontal and vertical sky wave easily matched to coax. Again my friends 160 meter inverted l was a 3 8th wave so in essence 200 feet not the 124 feet shown in this diagram. Even the use of l networks to match the 30ish ohms to 50 ohms. K2av contest scores the loss list your shrinking rf issues and fixes a brief technical report on the fcp the fcp story pdf 2012 ncj article planning place an fcp why use an isolation transformer place an inverted l design an inv l diy.

Home fcp only one db. In the fall of 2007 i was able to install my first amateur radio tower while this certainly was a huge improvement over my humble butternut multiband vertical my new tower had a major shortcoming a lack of antennas for the low bands. Good luck charley w1te loss on 160 from a 2 1 swr probably isn t worth the trouble of setting up a matching network at the antenna unless you have a tremendously long run of high loss coax. 160 meters and 80 meters.

I feed my hy gain ht as a modified inverted l on 160 and use capacitors made from rg 11u switched by a bc 375 tap switch. The system now up is the same original inverted l vertical section with the k2av folded counterpoise and isolation transformer in place of the prior elevated radial jumble. It is sort of an inverted l. First let s look at my wl 160m vertical.

You loud as k2av. Planning a dual band inverted l for 160 80 meters modeling a quarter wave inverted l antenna for the low bands. A very easy way to match an inverted l is to cut it a bit long so it is inductively reactive and then use series capacitance which does not need to be in the form of a variable. Tnx for reading bob n4jte.

Tuning the antenna over the band. For example with 100 ft of rg 213 and a 25 ohm load for an swr of 2 1 at resonance the total loss in the coax is 0 276 db of which mismatch loss.