[TowerTalk] Radial Question

[Robert Harmon]

thanks Jim,   I am going to measure the current in each of my 4 elevated 
radials and see
where I stand.

Bob
K6UJ


On 2/27/16 4:33 PM, Jim Brown wrote:
> 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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