Litz Wire

[godigit1]

Hi Mushaba,
Looking at the19/44 it is 31awg.
Two wires would be 28 awg and 3 twisted together would be 26 awg. Wire resistanse goes from .5 ohm per meter 1 wire to .15 per meter # wire.

[godigit1]

Litz wire offers some good results for the following reasons.

1. At low delays the wire itself may be detected as a target if it holds too much eddy current. Litz wire strands are very thin and insulated so eddy currents do not develop as easily as in solid or stranded, non-insulated wires.
The wires need to be soldered so that each strand runs in parallel with each other to carry the full current equally distributed to each strand. Soldering requires some special techniques. See this link: https://www.hflitzwire.com/litz-wire-soldering/ The best way to solder Litz wire is to use a solder pot and dip for a specified amount of time or use a Litz wire coating that melts easily when soldering. Key Point! You want each strand to be connected at the coil end joints.

2. Since square waves carry more upper harmonics than the primary frequency due to the square or sharp edges of the pulse. Typically, you should choose a Litz wire to operate at about 10X the PPS rate to account for the Litz wire benefit at the upper harmonic range.

3. Litz wire bundles are wound clockwise and in counter clockwise wire twist directions to minimize self inductance in the wire itself. See the construction techniques of the Litz wire style you choose to use for your coil.

I hope this helps?

Joseph J. Rogowski

Thank you I had not heard that for wire selection. Im trying to study up on litz, Do you by chance have any links to referance material I could read? I will also search wave form interaction with litz see if I can find something.
Trying to design a litz built specifically for the PI MD coil. I dont know if this has been done except maybe by MInelab or coiltek in their litz coils. Would surly like to see inside one of the new GPZ DoD coils. Pictures look like square wire litz.
So Far Both the litz wire I have bought only have one wire lay in the clockwise direction. I have read about the counter twisted wire but not able to find it.
Thanks again.

[godigit1]

Hi Green
Thanks,
Interesting, If im looking at things right the litz coil is at 16pf It apears to be slightly faster than the coil a at 12 pf and response to the nugget is slightly better at distance for coil E.
Its hard for me to see the colors they are so close.
I know you were evaluating the coils at the same # of turns. It would be interesting to see performance at the same inductance for these coil types.
Thanks.

[green]

Not shielded capacitance calculates, A=12pf, B= 17pf, C=16f and D=16pf. Might be less, think the method I used for measuring SRF measures lower than the method I use now. C=1/(4*pi squared*L*SRF squared)

E not C

[green]

Hi Green.
.
Did you have the capacitance of each of these coils Curious as to the differance betweend B,D,And E?

Not shielded capacitance calculates, A=12pf, B= 17pf, C=16f and D=16pf. Might be less, think the method I used for measuring SRF measures lower than the method I use now. C=1/(4*pi squared*L*SRF squared)

[mushaba]

Litz wire offers some good results for the following reasons.

1. At low delays the wire itself may be detected as a target if it holds too much eddy current. Litz wire strands are very thin and insulated so eddy currents do not develop as easily as in solid or stranded, non-insulated wires.
The wires need to be soldered so that each strand runs in parallel with each other to carry the full current equally distributed to each strand. Soldering requires some special techniques. See this link: https://www.hflitzwire.com/litz-wire-soldering/ The best way to solder Litz wire is to use a solder pot and dip for a specified amount of time or use a Litz wire coating that melts easily when soldering. Key Point! You want each strand to be connected at the coil end joints.

2. Since square waves carry more upper harmonics than the primary frequency due to the square or sharp edges of the pulse. Typically, you should choose a Litz wire to operate at about 10X the PPS rate to account for the Litz wire benefit at the upper harmonic range.

3. Litz wire bundles are wound clockwise and in counter clockwise wire twist directions to minimize self inductance in the wire itself. See the construction techniques of the Litz wire style you choose to use for your coil.

I hope this helps?

Joseph J. Rogowski

Yes it helps a lot,thanks for the usefull information!

[bbsailor]

Litz wire offers some good results for the following reasons.

1. At low delays the wire itself may be detected as a target if it holds too much eddy current. Litz wire strands are very thin and insulated so eddy currents do not develop as easily as in solid or stranded, non-insulated wires.
The wires need to be soldered so that each strand runs in parallel with each other to carry the full current equally distributed to each strand. Soldering requires some special techniques. See this link: https://www.hflitzwire.com/litz-wire-soldering/ The best way to solder Litz wire is to use a solder pot and dip for a specified amount of time or use a Litz wire coating that melts easily when soldering. Key Point! You want each strand to be connected at the coil end joints.

2. Since square waves carry more upper harmonics than the primary frequency due to the square or sharp edges of the pulse. Typically, you should choose a Litz wire to operate at about 10X the PPS rate to account for the Litz wire benefit at the upper harmonic range.

3. Litz wire bundles are wound clockwise and in counter clockwise wire twist directions to minimize self inductance in the wire itself. See the construction techniques of the Litz wire style you choose to use for your coil.

I hope this helps?

Joseph J. Rogowski

[godigit1]

Hi Green.
.
Did you have the capacitance of each of these coils Curious as to the differance betweend B,D,And E?

[green]

Test I did awhile back that included a litz coil. Litz coil allows shortest sample delay. Other than delay time they were similar.

[godigit1]

Here is a valuable link on litz you will see that for the frequency range we operate in you want a fine guage wire 30 equivalent.
19/44 is right in there between 32 and 30.

http://www.litzwire.com/nepdfs/Litz_Technical.pdf

And here is a strand calculator. should you try your own twist. For any benefit other than resistance reduction per foot at the cost more capacitance. At least thats my take on it someone please correct me if Im wrong.

https://www.v-cap.com/tech.php

[kt315]

sorry i am not able to find your problem in english. so i take text in russian and googletranslated.
i colored the place that was colored in original.http://136.73.ru/t_ant/litz.htm

One of the most important conditions for the implementation of the excellent properties of the litsendrat is the need for each (!!) wire to be soldered at both points of the coil connection. If you do not fulfill this condition, the remaining unsoldered wires dramatically worsen the quality of the coil to the level of an ordinary wire. There are several methods for soldering a litzedrat in p / amateur conditions

[mushaba]

I think the litz i found made for old TV transformers..

Just wind some parallel wires

You say to take some of the to make a single wire?

do not use standart litz for radio. thats hard to solder and you get be a loss if you miss unsoldered wire. take 0,25-0,3 mm wire and lay down in 3-4 time.

Its core is black wires,old and hard to solder as you say but with sandpaper and flux i think it will solder in the end..

[kt315]

do not use standart litz for radio. thats hard to solder and you get be a loss if you miss unsoldered wire. take 0,25-0,3 mm wire and lay down in 3-4 time.

[6666]

Just wind some parallel wires

[mushaba]

Hello
Found at a local warehouse Litz wire (insulated with fabric) from Electrisola at very low price(300m for 10 Euros) but its too small 19x0.05 (19/44) is it possible to construct a mono coil (or any other search coil) with this?Thanks