[TowerTalk] More on radials

[Rudy Bakalov]

I don't really know. Seriously, the tower itself is 90' BUT there is a KT36XA at ~65', then 4 el 40m M2 at 90', and finally another KT36XA at about ~105'. I don't think any model can properly factor in all this extra aluminum so I will have to actually measure it.

R

Sent using a tiny keyboard.  Please excuse brevity, typos, or inappropriate autocorrect.


> On Sep 5, 2017, at 8:35 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
>> On 9/5/2017 5:11 PM, Rudy Bakalov via TowerTalk wrote:
>> Now that I have decided to lay on the ground radials,
> 
> How many do you plan to install?  You'll need a lot more on the ground than elevated to achieve the same low ground loss.  4 per vertical is minimum for elevated radials, and I wouldn't consider anything less than 32 on-ground radials. Elevated radials need to be close to a quarter wave, but on-ground radials are lengthened by their proximity to the earth, so have VF on the order of 0.8. In other words, they can be 20% shorter.
> 
>>  another practical question pops up and so far I have not found an answer.
>> 
>> I plan on shunt feeding for 160 the tower in the center of my 80 4SQ,
> 
> How tall is the tower?  Depending on its height, it might be worth rigging a sloping wire from the top and feeding it from the base against radials. I'd try an NEC model. I'm doing that and getting a couple of dB from the tower acting as a passive reflector. (And it needs radials too!)
> 
>> can I/should I tie all the radials together? The 160 radials will certainly cover the same distance as the 80 radials so is there a requirement for each 80 element to have its own radials?
> 
> I don't know enough to offer advice on this.
> 
> 73, Jim K9YC
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