help with coil

[Nc-Dirty-digger]

could someone explain this to me?i understan the amount of turns and the size.but what size wire is this or should i use and what is cu mono wire?

38cm. diameter concentric = 28 turns Cu mono wire

R is 3ohm to 7ohm in this works perfectly.

i assume R means resistance of 3 to 7ohm's

[Nc-Dirty-digger]

i forgot to add this is for a xr71/deltapulse

[Geo]

could someone explain this to me?i understan the amount of turns and the size.but what size wire is this or should i use and what is cu mono wire?

38cm. diameter concentric = 28 turns Cu mono wire

R is 3ohm to 7ohm in this works perfectly.

i assume R means resistance of 3 to 7ohm's

Wire must be between 0.3 and 0.4mm diameter. If you will use bigger diameter then maybe you need to connect a resistor in series with coil so the total resistor to be about 3.5 to 4 Ohm.
Mono.... mean not DD , a simple 28 turns round coil, nothing else.

[porkluvr]

I used MiscEl to derive that 24AWG would give you about 2.8Ω, and with 26AWG you're looking at about 7Ω. The final inductance value will depend on how closely you wrap the turns. Smaller diameter wire allows tighter spacing and can result in higher inductance. Sooo I guesstimate your final inductance might vary between about 825uH and 1mH depending on the type wire and how tightly you push the turns together. (Ballpark figures, obviously.)

MiscEl is great, but, although it asks for wire diameter (that would be bare wire diameter) it will not allow inputting of insulation thickness. "Bundle diameter" can be adjusted to fudge that aspect. You're not going to get an exact number anyway, so I suppose there's no harm in that.

I think that Deltapulse is mainly meant for finding deep relics (judging from the timing and type coil generally described for it) so a "fast" coil is not really necessary - and therefore relatively small diameter 24AWG is acceptable.

One very good source of wire diameter vs wire gauge information is "Magnet Wire Dimension Chart". It's a fairly comprehensive collection of data for American and European wire gauges. (5.7MB)
http://www.allem.com/wireengr.html

[lucifer]

could someone explain this to me?i understan the amount of turns and the size.but what size wire is this or should i use and what is cu mono wire?

38cm. diameter concentric = 28 turns Cu mono wire

R is 3ohm to 7ohm in this works perfectly.

i assume R means resistance of 3 to 7ohm's

I think 'Cu mono wire' stands for copper single stranded wire and is not related to coil type (DD or something else).

[Nc-Dirty-digger]

thanks for the replies guy's. I went out to pick up some supplies today and all i could get localy was 26awg.will this work and what should i do in terms of how many turns to use?also while i was looking at wire i was checking out BNC and other connectors. what would everyone here recommend for connectors and coax?thanks for all the help