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I should add that my coil is wound with 175/46 Litz, perhaps a
little smaller diameter than the specified 100/44 Litz. I've found
it works even better at LF, in fact I've found all the types of
/46 Litz work better at LF than /44 Litz.
On 8/22/2019 10:47 AM, Steve Ratzlaff
via Groups.Io wrote:
Curious, I unsoldered my R33 LF coil and measured it--1546 uH
at 100 kHz test frequency--so mine isn't close to 1700 uH
either, yet mine will tune down to at least 200 kHz with my PL
380 ULR. Here in USA there are no LWBC stations to be heard so I
try for NDBs, which only go down as far as 198 kHz (DIW in North
Carolina, a powerful NDB).
So I guess your R33 rod has even less permeability than mine,
and the 1432 uH is probably correct. If you can rewind it with
more turns, that's what I'd suggest doing. It wouldn't matter if
turns on the end were under the rod support, that wouldn't
affect the rod's pickup.
Hi all! I’m trying to make the 7.5” loopstick LW antenna
according to the instructions. I used the Amidon R33-050-750
rod, 100/44 litz wire, made 122 turns of the coil, which is
located exactly in the center of the rod and which length is
106,5 mm. However, the output inductance measured by the
multimeter is only 1432 uh instead of 1700 uh. The similar
result was shown by another multimeter VICY DM4070. I think that
is a strong deviation. Can anybody help to resolve this problem?