[TowerTalk] Length of Inverted-L.

[n6sj at earthlink.net]

Pete-

I've had good luck with the longer approach.  I put a 30-150pF variable cap in series with the feed point and nulled the SWR at 1830 KHz.  I have only two elevated radials (each 135') but it tunes and loads fine with 500 watts.  The longer top sloping wire adds the inductance you would otherwise need to provide with an inductor at the feed point.  

With the longer total length and series capacitor my RigExpert AA-54 shows 50 ohms resistive load and 0 ohms reactance at resonance.  

73,
Steve
N6SJ


-----Original Message-----
From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of N4ZR
Sent: Friday, October 5, 2018 8:12 AM
To: TowerTalk <TowerTalk at contesting.com>
Subject: [TowerTalk] Length of Inverted-L.

What to do when two respected references differ?  ON4UN's book assumes an Inverted-L is always a quarter wave ~135 feet), while the ARRL Antenna Book assumes 165-170 feet.  ON4UN mentions longer antennas to increase feedpoint impedance, but doesn't seem to put much faith in that.

Comments?

-- 

73, Pete N4ZR
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