Re: 7.5” Loopstick LW antenna low inductance problem
Assuming you're using a real R33 rod, which if you bought it from
Amidon, is most likely the case, then it sounds like maybe your
rod's permeability is lower than other R33 rods, and that other
than rewinding and putting on more turns, you're stuck with this
inductance. I realize the rods are very expensive ($20 here in the
USA, plus shipping) so you probably wouldn't buy another one just
to see if it gives more inductance. Depending on how low you want
to tune in LF you may be able to get by with this lower inductance
rod and coil. So you may want to just put it on the radio and see
how low your particular radio's SiLab's IC tuning will go--maybe
you'll get lucky and it will tune low enough.
On 8/22/2019 9:58 AM, igvitk@... wrote:
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?