Another coils for Relic Hawk?

[Unregistered]

Can i use COILTEK 10X5 INCH ELLIPTICAL (250X125MM) Minelab Musketeer,or another detectors company for Relic Hawk Minelab detector?
I understand that they have different connectors but operation frequency and type DD is same- 5khz.
Sorry my english
Thanks
Andrey

[GTK]

the musketeer has different phase shifting, but preamp & generator are pretty much the same .. they should work fine if you fix the coil connectors.. i think

[Unregistered]

Minelab XT-18000 coil is usable on Relic Hawk if you change the connectors. Coil specs are almost identical. XT-18000 uses different frequencies but same coil.

[KingJL]

Minelab XT-18000 coil is usable on Relic Hawk if you change the connectors. Coil specs are almost identical. XT-18000 uses different frequencies but same coil.

What are the coils specs for Relic Hawk? I figure the TX coil to be about 1mH (5.03 kHz with the 1 uF cap in parallel); but what about the RX coil?

[Max]

What are the coils specs for Relic Hawk? I figure the TX coil to be about 1mH (5.03 kHz with the 1 uF cap in parallel); but what about the RX coil?

Hi,
found this on a Russian website...
here : http://www.md4u.ru/forum/viewtopic.p...d9ce6ede041361

"
coil is 35cm DD coil,
RX=130 windings,0.25mm wire,on round former d=30cm ;42ohms,15mH
TX=35 windings,0.55mm wire, on round former d=30cm ;2.5ohms,1mH
"

But better you ask some other folk about...

Kind regards,
Max

[KingJL]

Hi,
found this on a Russian website...
here : http://www.md4u.ru/forum/viewtopic.p...d9ce6ede041361

"
coil is 35cm DD coil,
RX=130 windings,0.25mm wire,on round former d=30cm ;42ohms,15mH
TX=35 windings,0.55mm wire, on round former d=30cm ;2.5ohms,1mH
"

But better you ask some other folk about...

Kind regards,
Max

Thanks Max!
Regards,
J. L. King

[amtech2005]

another coils for Relic Hawk?

I read when the Relic Hawk was manufactured it came standard with a 15 inch search coil and the 8 inch coil was optional. So my question is , the Relic Hawk circuit on this forum that is almost ready to be built by a bunch of us , Do we set up the Relic Hawk circuit board with the 15 inch coil or the 8 inch coil ? Which is the correct coil to optimize and test everything with ????? Me , I would set up everything with the "standard minelab" 8 inch coil. But maybe that's wrong ??...Any advice , let us all know !!............ Eugene

[Max]

I read when the Relic Hawk was manufactured it came standard with a 15 inch search coil and the 8 inch coil was optional. So my question is , the Relic Hawk circuit on this forum that is almost ready to be built by a bunch of us , Do we set up the Relic Hawk circuit board with the 15 inch coil or the 8 inch coil ? Which is the correct coil to optimize and test everything with ????? Me , I would set up everything with the "standard minelab" 8 inch coil. But maybe that's wrong ??...Any advice , let us all know !!............ Eugene

Hi Eugene,
it's a bit tricky thing... cause we have to find best compromise for now.

I'm sure many will want make it as original with 15'' coil to get maximum depth from it on far targets... but I will prefer too a smaller coil cause swapping around a 35cm coil is not actually in my plan of using it.

I'm sure the detector will perform good using also other smaller coils, probably we could not get reasonable good performances with 8'' but 10''-12'' range is interesting. A coil of 27-28cm will let us compare also Relic Hawk with the cloned TGS+largeDDcoil that's one of the reason we are doing such work on relic hawk... beat TGS on performance and stability (if possible) using same coil size.

Once detector clone will work we could easy switch coils if needed... but I think the smaller ones e.g. 8'' would be let out of experimentation: one could use an e.g. used standard ML coil with it. I think also that someone will develop a good recipe for 8'' alternative design but cause 8'' is good in particular situations and we are looking for performances...maybe this will happen later in development.

I think the interesting size to experiment with start at 10'', probably 10'' or 11'' on RH will perform better than on TGS, that's why is so interesting testing that, or we can just go for the 15'' enormous coil but we cannot compare then results with TGS.

Probably the best will be developing 2 coils , one of say 11'' diameter and one 15'' diameter but sure will be not easy stuff going parallel on this and so we probably have to choose one of the two.

But better if Ivconic and other folks here will give their opinion about.

Kind regards,
Max

[unregistered]

Coil Prameters

Hi Eugene,
................
...............
we could easy switch coils if needed... but I think the smaller ones e.g. 8'' would be let out . I think also
I think the interesting
Kind regards,
Max

Pike
First peeple are using their ideas in an unprofessional way even professional too, whats the coils holding outercase or shell is made of , whats the magnetic absorption or resistance when a 400V spike is generated, should we use plastic or shell type of material, scope owners have to check these parameters using a field measurement device and a PI detetctor coil excited.

There are also other parameters which coil is best either a spiral coil with turn to turn spacing of how much or lumped coil of same turns.

These are just 2 parameters and there are other parameters too and I forgot which u should remember when typing/replying.

[Max]

Pike
First peeple are using their ideas in an unprofessional way even professional too, whats the coils holding outercase or shell is made of , whats the magnetic absorption or resistance when a 400V spike is generated, should we use plastic or shell type of material, scope owners have to check these parameters using a field measurement device and a PI detetctor coil excited.

There are also other parameters which coil is best either a spiral coil with turn to turn spacing of how much or lumped coil of same turns.

These are just 2 parameters and there are other parameters too and I forgot which u should remember when typing/replying.

Yes... but we are talking of a VLF detector...

[Unregistered]

Max maxi

Yes... but we are talking of a VLF detector...

Pike here

Ok but u need to reply to the PI or VLF too, as they both have some common parameters like magnetic parameters and shell design.

[Max]

Pike here

Ok but u need to reply to the PI or VLF too, as they both have some common parameters like magnetic parameters and shell design.

Yes... shell of coil could be the same... but other stuff is very different... so when you think at e.g. RH oscillator you'll see it actually works to provide 5Khz sinus not sharp step signal like (time domain) that's employed in PI.... RH rx will treat the RX signal in analog path considering not the switchoff params but phase... so you see the things are pretty different.

About magnetic field... well... yes more current will give always more strenght but the concept is , also here, different from PI where pulsed power is employed and you concentrate magnetic energy in the field that then suddenly collapse to generate eddy currents. It's e.g. easy increasing the DC current in PI coils making other coils and changing e.g. Mosfet... but not so easy sustain higher sinusoidal (periodic --> effective ) current in a VLF oscillator... that's why special resonant design are often taken into account when doing so... that's totally different story from having a PI coil with just thicker wire... and a lower Rds on at mosfet...

Kind regards,
Max

[Qiaozhi]

Pike here

Instead of putting "Pike here" in every post, why don't you register?
Unregistered posters tend not to be taken seriously here.

[Unregistered]

Coils

Yes... shell of coil could be the same... but other stuff is very different... so when you think at e.g. RH oscillator you'll see it actually works to provide 5Khz sinus not sharp step signal like (time domain) that's employed in PI.... RH rx will treat the RX signal in analog path considering not the switchoff params but phase... so you see the things are pretty different.

About magnetic field... well... yes more current will give always more strenght but the concept is , also here, different from PI where pulsed power is employed and you concentrate magnetic energy in the field that then suddenly collapse to generate eddy currents. It's e.g. easy increasing the DC current in PI coils making other coils and changing e.g. Mosfet... but not so easy sustain higher sinusoidal (periodic --> effective ) current in a VLF oscillator... that's why special resonant design are often taken into account when doing so... that's totally different story from having a PI coil with just thicker wire... and a lower Rds on at mosfet...

Kind regards,
Max

Pike here

1) Which COIL IS best SPIRAL COIL or 27 turns lumped together coil for PI

2) If we use a 27turn spiral @21cm dia for Tx and small 3 cm coil of 50 turn dia for Rx coil in a PI, can u tell me whether it responds to eddy currents with high sensitivity, here Rx coil is not connected across the damping resistor of mosfet(or to the Tx coil itself)

[Max]

Pike here

1) Which COIL IS best SPIRAL COIL or 27 turns lumped together coil for PI

2) If we use a 27turn spiral @21cm dia for Tx and small 3 cm coil of 50 turn dia for Rx coil in a PI, can u tell me whether it responds to eddy currents with high sensitivity, here Rx coil is not connected across the damping resistor of mosfet(or to the Tx coil itself)

Do you mean if you pike that coils ?

Depends on coils... depends on what you need... spiral has some advantages... but what's the purpose of using a 3cm rx coil with no damping resistor in a PI ? You need the damping effect to avoid oscillations...

Pike here... why do you need that stuff ?

Kind regards,
Max