IGSL

[ivconic]

Here it is one of the options from the past;

[ivconic]

I posted sketch (picture) somewhere ... most probably on this thread or Tesoro Golde Sabre thread, of cable which suits nice for my coils.
Can't find it right now.
It is making the difference of how you will connect coils, shield and cable. Better to perform tests and check several options before you close your coil and apply filler.
Cable must have nice and rich shield, usually litz wire net.
Use cable with 3 separate pvc coated leads (preferably litz too) and all those in common shield finally all coated in pvc or silicone.
That's actually common cable, simple ordinary, usually met at most of coils today.
Second option (not bad too) is cable with two separate coaxial put in common coating (XP coils are using such cable).
...
Usually i connect cable and than later i perform coil nulling. A assume you will have to re-balance your coils a bit after add proper cable.
According to your videos i am sure you already made good coil, now you only have to finish it properly.
Cheers!

[seadoggy]

Looks very good to me.


Shield makes or breaks the coil when you use the coil in the field. I had to make a second coil before I got it right. First tested okay. Went on a rally and the dew on the grass made the coil almost unusable until the sun dry the grass a bit. Second coil I used Don Bower method of keeping the shield separate from the TX and RX ground in the head worked fine and is very stable. Don't known the cause for sure but if you can test over wet grass before you seal the coil up would be a good idea.

I dont know how you think shield separate from TX and RX!?you think TX/RX shield go with wire separate to ground at PCB??

[Koala]

ok i must try search that cable on ebay.thx for info.

I will post here new video of my IGSL i think it is good now he dont respond at ferrite just little but i think that is good.

Final test IGSL(ferrite rod)

Looks very good to me.


Shield makes or breaks the coil when you use the coil in the field. I had to make a second coil before I got it right. First tested okay. Went on a rally and the dew on the grass made the coil almost unusable until the sun dry the grass a bit. Second coil I used Don Bower method of keeping the shield separate from the TX and RX ground in the head worked fine and is very stable. Don't known the cause for sure but if you can test over wet grass before you seal the coil up would be a good idea.

[seadoggy]

I use van damme microphone cable 4 core. Nice and flexible unlikely to break.

Looks like ferrite would be rejected if it was smaller.

ok i must try search that cable on ebay.thx for info.

I will post here new video of my IGSL i think it is good now he dont respond at ferrite just little but i think that is good.

Final test IGSL(ferrite rod)

[Koala]

I use van damme microphone cable 4 core. Nice and flexible unlikely to break.

Looks like ferrite would be rejected if it was smaller.

[seadoggy]

Good progress, bravo!
But... you have to use proper shielded cable from coil to pcb, NOT simple wires.
Anyway, you almost there.
Cheers!

Thanks Ivica .what is best cable to use??,can you attach pic here,or link

[ivconic]

Good progress, bravo!
But... you have to use proper shielded cable from coil to pcb, NOT simple wires.
Anyway, you almost there.
Cheers!

[seadoggy]

Second test now with shield.

i think it is much better.

[seadoggy]

I make new coil again and i think i almost reject ferrite rod!!,but i am not really sure is it good well.
here is video of new results.

Coil still not shielded.

[Davor]

Yes, those are small ferrite cores like these: http://i.ebayimg.com/images/g/ViAAAO...zLR/s-l300.jpg
They work quite well.
It is good to have at hand a piece of alu-foil lightly jammed into a ball for adjusting discrimination.

[seadoggy]

Sheesh! You not suppose to have 14.5kHz with Musk coil at all, who told you that?
As i recall 8.3 to 8.7kHz was the frequency at my diys.
It's been a while... i haven't done nothing similar as IGSL for quite some time, that's why i don't take a part in these discussions here, simply because i forgot so many things about it.
But one thing i think i remember good; my IGSL was working good in range 8.3 to 8.7 kHz at the time.

Ok thx Ivica and Davor,i dont know where i see 14.5kHz ,i make new coil now running at 8,5 kHz,where to find E cores?? is that in small (transformators)?

[ivconic]

I just measure the running frequency at TX coil i get 9.08 kHz!!,i think it is TX coil problem because i dont have 14.5 kHZ on TX coil and that why i cant remove ferrit rod.

Sheesh! You not suppose to have 14.5kHz with Musk coil at all, who told you that?
As i recall 8.3 to 8.7kHz was the frequency at my diys.
It's been a while... i haven't done nothing similar as IGSL for quite some time, that's why i don't take a part in these discussions here, simply because i forgot so many things about it.
But one thing i think i remember good; my IGSL was working good in range 8.3 to 8.7 kHz at the time.

[Davor]

Your coil is Musketeer style, and most probably your IGSL is as well. So 9kHz is OK as well. There might be a problem with Rx resonance being too close if the Rx coil capacitor is too big. Also if you built it strictly according to the original plan, you have 2 channels to adjust ferrite reject. Also please note that some ferrite rods are slightly conductive, and their response is not exactly where it should be. I'm using a small bag with a bunch of square-ish ferrite E-cores for that reason.

Now that your device is nearly done, you may wish to seek a pin swap mod that fixes the ferrous channel offset.

[seadoggy]

If you have a way of measuring frequency follow Don Bowers 101 instructions.

"my favorite method is just attach the coil to your completed circuit board (J1) and measure the running frequency. The Tx should run at 14.5 kHz.
Next, half of the form must be removed and the wire must be constrained. I use simple dental floss. Note: If wire is wound on a two sided form tightly, very little change in inductance will occur once constrained. At most, it should increase by only .1 mH.
Build your Rx coil in the same manner, except for the number of turns. Also, to check your Rx coil, you can attach it to your completed circuit as well, but attach your Rx coil to J1 (the Tx circuit). Since this is 6.5mH, the oscillator should now run at 13.95 kHz. Again, this is just a quick check and will then be removed! "

I just measure the running frequency at TX coil i get 9.08 kHz!!,i think it is TX coil problem because i dont have 14.5 kHZ on TX coil and that why i cant remove ferrit rod.