[Elecraft] AX1 Loaded Whip Antenna - Elevation and

[Wayne Burdick]

And I've worked all over the world with 5 or 10 watts doing it :)

Wayne


> On Aug 27, 2019, at 4:07 PM, Wayne Burdick <n6kr at elecraft.com> wrote:
> 
> I'm generally walking when I use the AX1 (pedestrian mobile, or /PM). It isn't possible to elevate the radial under these circumstances; it drags on the ground. The whip is the radiator.
> 
> Wayne
> N6KR
> 
> 
> 
>> On Aug 27, 2019, at 3:05 PM, David Gilbert <xdavid at cis-broadband.com> wrote:
>> 
>> 
>> I'll try not to beat this into the ground here, but I think the physics here is important.
>> 
>> As K9YC said in his reply to you, equal currents go in both directions from the feedpoint ... to the AX1 and to the counterpoise wire.  That's simply physics, and it's true unless currents on the shield of the coax cause imbalance ... in which case the coax is doing a bunch of radiating.
>> 
>> Now then, what is important is what happens to those equal currents.  It doesn't matter if one side of the feedpoint is the AX1 or if it is the "counterpoise" wire ... they are both simply loads as far as the feedpoint is concerned.  Read that again ... it is THE critical concept.
>> 
>> Current generates a radiated field.  That is simple physics. Resistive loss dissipates energy instead of radiating it.  That is also basic physics.  To a lesser extent, current distributed over a longer length is a more effective radiator than a shorter length even disregarding impedance concerns.  Consequently, a short, lossy "load" is going to radiate less RF than a longer, less lossy "load".  Straighter is better than snaky.  All of that is fact.
>> 
>> Unless you have a very short counterpoise wire it is going to try to do a better job of radiating RF than the AX1 if you give it a chance.  Keep it as straight as possible and keep it clear of ground and other RF dissipating structures.
>> 
>> That doesn't mean that the AX1 isn't serving a very useful purpose. It is.  It is allowing you to feed current into the "counterpoise" wire with a reasonable feedpoint impedance.  That's critical.  But it doesn't mean that the AX1 is doing the bulk of the radiating unless you aren't using a counterpoise at all.
>> 
>> Hope this helps.  73,
>> Dave   AB7E
>> 
>> 
>> 
>> 
>> On 8/27/2019 2:29 PM, Grant Youngman wrote:
>>> 
>>> I’m not saying that an elevated counterpoise won’t work with the AX1, just that I’m having trouble getting my head around considering the wire as the main radiator, and the AX1 as a counterpoise???
>>> 
>>> Grant NQ5T
>>> KX3 (8342)/KXPA100
>>> 
>>> 
>> 
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