[Elecraft] KX3 & Loop Antennas

[TFJM]

Thanks for the feedback Fred. So I'll have to turn off the internal KX3 ATU? How do I do that?

Also have you seen or read anything on the Chameleon F loop? I saw a few things on You Tube. Similar to the Alex Loop.

Doesn't the Alex Loop tune itself?

73

Tom
W1PDI

Sent from my iPhone

> On May 30, 2016, at 8:15 PM, k6dgw [via Elecraft] <ml-node+s365791n7618253h98 at n2.nabble.com> wrote:
> 
> I replaced my Buddipole with an Alex and use it a lot in the field ... 
> understand that as I accumulate birthdays, "field" more and more means a 
> drive-to a park or friendly hill.  It works better than the BP ever did, 
> I can set it up in 5 min, it is fairly insensitive to ground and 
> surrounding objects, including me.  I sit under it so I can reach the knob. 
> 
> It's a resonant transformer.  To be effective, it must be EXACTLY 
> resonant.  That's a bit touchy on 30 and 40.  You MUST bypass the ATU. 
> "Getting close" with the knob and then letting the ATU do it's matching 
> job yields a fairly pricey dummy load.  On 40, the BW of the Alex isn't 
> much more than a SSB signal. 
> 
> Beware:  Small mag loops can involve some huge circulating currents and 
> RF voltages.  The Alex is OK to 10W.  Google "magnetic loop calculator" 
> for a very cool little calculator.  Try it with 1 KW, it will really 
> surprise you.  And sadly, I don't think a Reynolds Wrap hat will protect 
> you if you're close. 
> 
> Small mag loops are bi-directional in the plane of the loop but it is 
> very broad.  Orthogonal to the loop plane, there are two very sharp, 
> deep nulls, sometimes useful to eliminate noise from a point source or QRM. 
> 
> 73, 
> 
> Fred K6DGW 
> - Northern California Contest Club 
> - CU in the Cal QSO Party 1-2 Oct 2016 
> - www.cqp.org 
> 
> On 5/30/2016 4:38 PM, TFJM via Elecraft wrote: 
> > Has anyone had much success using either an Alex Loop or Chameleon P Loop 
> > antenna with their KX3? I have few antenna options in an apartment situation 
> > and throwing a 25 foot long wire into a nearby tree has not worked for me. 
> > Even tried loading up a 33 foot long aluminum balcony railing with no luck. 
> > 
> > Thanks, 
> > Tom W1PDI 
> 
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