Re "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.: Not to worry,
because the AlexLoop would fail very quickly if
subjected to a kW! I'd not want to be under it or
anywhere near it in that case.
73, Phil W7OX
On 5/30/16 5:13 PM, Fred Jensen 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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