[TowerTalk] Radial Question

[Jim Brown]

You may be fairly close. The wild variable is the soil underneath them 
and their heights. N6LF recommends doubling the number of elevated 
radials to further equalize the currents.  I have elevated radials on 
two antennas, and only have four.

73, Jim K9YC

On Sat,2/27/2016 11:43 AM, Robert Harmon wrote:
> I use four elevated radials for 80m.  What I did was hook up my 
> analyzer to each pair, 90 degrees from one another,  without 
> connecting anything else tune for resonance (just like a dipole, which 
> it essentially is)  Then connect them all together to the vertical 
> antenna feedpoint coax connection.  This worked very well, do I have 
> equal currents in each radial with this approach ?
>
> Bob
> K6UJ
>
> On 2/27/16 9:32 AM, Dennis W0JX via TowerTalk wrote:
>> The effect of the earth on the radial generally is to detune it and 
>> make it longer electrically than it is. Perhaps Frank W3LPL can add 
>> something here as to why he recommends 70 feet.
>> As for elevated radials. many studies have concluded, going back as 
>> far as Les Moxon, that quarter-wave elevated radials are about the 
>> worst possible length you can make them. This particular length makes 
>> it very difficult to obtain equal currents in each radial. Dick 
>> Weber, K5IU, wrote an excellent article on this topic, stating that 
>> ideal lengths are 60 degrees (or about 2/3rds of a quarter 
>> wavelength) loaded by a single small coil, or 120 degrees (about 
>> 4/3rds of a quarter wavelength) tuned by a variable capacitor, are 
>> ideal lengths. Of course, a multi-band vertical complicates matters 
>> and would require a loading coil for each band.
>> 73, Dennis W0JX
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