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Inverted-L for 80m & 160m


The 18m glassfibre pole from SPIDERBEAM is used, but without the top section too fragile to support the weight wind load of the 80m trap coil
post 04 Dec 2024
Inverted-L for 80m & 160m

Antenna 80 meter Links

75



80 Meter Tower Vertical with Short Radials

The modelled resistance component of the feed point impedance at 3.65 MHz is 80 ohm. It is high due to ground loss and being well off resonance. I chose to simply place a capacitor load in series with tower monopole, chosen to have a reactance of equal magnitude to the inductive reactance of 44 ohm at 3.65 MHz. This requires a capacitor of 1000 pf

Single Support Gain Antennasfor 80 and 160 Meters
Examples of antenna ,Sloper Arrays, having a tower

Dual Band Antenna 40-80m
PVC Diameter 50mm, total coil turns 78, wire 1.25 mm, for PVC size Diameter 42mm (1 1/4′) the number of turns 89 turns around 100uh

Dipolo rigido nvis 40-80m
Dipolo caricato sulle bande dei 40m-80m

Skyloop Antenna 3.5 to 50 MHz
I decided to try a new type of hf antenna skyloop or deltaloop


Psion ham software

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Radioassistance

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SunCalc

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