Posted by
ARDUJENSKI on
Dec 20, 2010; 3:45pm
URL: http://elecraft.85.s1.nabble.com/Inverted-L-was-OT-Vertical-antenna-tp5852957.html
Going from loop to vertical involves two very different lob patterns. It
was never mentioned if the antenna performance was to favor local or DX. Here
is one which it does not matter as it adapts for both.
A nice compromise antenna which takes into account:
---high and low angle lobe patterns
---good match (resonant on 80m)
---small footprint
======DESCRIPTION===============================
INVERTED-L: 33 ft vertical, 33 ft top wire, feed at base against 12 16ft
radials. I use Radio Shack low loss 300 ohm tv wire for feed
According to calculations EZNEC had a 40ft top wire. In the field I
trimmed it until we got an
acceptable match on several bands
For supports I have used the DK9SQ mast as the main and used the Black
Widow 20ft
for the end support with great success
----------------------------------------------------
I use RCA connectors for many of my antennas. I install male RCAs on wires
and interconnect with using DOUBLE FEMALES. For 300 ohm TV wire I will
solder
short piece of speaker wire to each of the conductors and then securely
tape
the soldered area to the ribbon insulator body . To the end of each
speaker
wire I afix a MALE RCA. Generally I will make one speaker wire on each
end a
little shorter (3/4 inch) so I can tell easily identify which wire is
which.
The RCAs work great and it they break off in the field I carry wire nuts
for
emergencies
----------------------------------------------------
I have EZNEC pattern (PDF) for several bands and also a sketch for the
300
ohm connection if you want more details
----------------------------------------------------
Note at the QTH I have used this for 80 and 160m with good success
including
contacts with Japan on 160m. I am sure the key is the other fellows has
HUGE
arrays but it worked.
Hope this helps
Alan KB7MBI
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