A
Anonymous
Guest
Eric I was hoping you could tell me what coil on the market to day would work on a CS7 Sea scoop. Would the head hunt PI coil work.
thank you.
thank you.
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A
Anonymous
Guest
I thought I may be able to answer your question.
You can use a CScope coil from a CS6, a coil from a Headhunter PI, Beachscan, Goldquest coil.
Mr. Bill
On cold, snowy Cape Cod, MA. <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt="
">
You can use a CScope coil from a CS6, a coil from a Headhunter PI, Beachscan, Goldquest coil.
Mr. Bill
On cold, snowy Cape Cod, MA. <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt="
">
A
Anonymous
Guest
One point, doesn't the CS7 have a waterproof connector? you would have to change on some of those coils, maybe the HH PI is the same? Eric's 11" coil would be best anyhow.
A
Anonymous
Guest
Mr Bill,
It would be nice if we could find an easy way to post the various characteristics of PI coils. Maybe it can be done as a subject on the modification forum to be added by various folks who have access to various PI coils.
For example, I recall Eric saying the the CS6 coil is 1mH inductance and a relatively high resistance, low current type coil.
As a minimum, the posted coil parameters should include:
Coil Name:
Coil Inductance:
Coil DC Resistance:
Cable length:
Connector type: solder in, number of pins
Self Resonant Frequency: measured at the end of the cable
Does this sound useful for PI builders? Maybe Guvner can set up an on-line coil database.
bbsailor
It would be nice if we could find an easy way to post the various characteristics of PI coils. Maybe it can be done as a subject on the modification forum to be added by various folks who have access to various PI coils.
For example, I recall Eric saying the the CS6 coil is 1mH inductance and a relatively high resistance, low current type coil.
As a minimum, the posted coil parameters should include:
Coil Name:
Coil Inductance:
Coil DC Resistance:
Cable length:
Connector type: solder in, number of pins
Self Resonant Frequency: measured at the end of the cable
Does this sound useful for PI builders? Maybe Guvner can set up an on-line coil database.
bbsailor
A
Anonymous
Guest
I could do this on Geotech. In fact, I've been meaning to for some time, as I have about 50 coils I've measured. Haven't done self-resonance, tho.
I'll try to get something set up in a day or two.
- Carl
I'll try to get something set up in a day or two.
- Carl
A
Anonymous
Guest
Carl,
This database would answer many questions for people building or attempting to improve the performance of their PI machine. Making the coil database useable for those who want to swap coils would require information about the various connectors. This would also allow them to make the right adapters. Maybe it should have a section for commercial coils and another section for homemade coils.
These technical PI forums have a wealth of information, but it is spread out over years of questions and answers. All too often the best information is not related to the posted topic.
A coil database would be a good way to begin consolidating information that could be a model for other PI information being consolidated.
Ultimately this would evolve into a group-authored pool of information organized in a more useable format.
I have some more ideas about this if anyone is interested?
bbsailor
This database would answer many questions for people building or attempting to improve the performance of their PI machine. Making the coil database useable for those who want to swap coils would require information about the various connectors. This would also allow them to make the right adapters. Maybe it should have a section for commercial coils and another section for homemade coils.
These technical PI forums have a wealth of information, but it is spread out over years of questions and answers. All too often the best information is not related to the posted topic.
A coil database would be a good way to begin consolidating information that could be a model for other PI information being consolidated.
Ultimately this would evolve into a group-authored pool of information organized in a more useable format.
I have some more ideas about this if anyone is interested?
bbsailor
A
Anonymous
Guest
I thought about including connector info in the coil database, but then decided it would be best to have a separate connector page that has pictures of each connector (from, say, the connector manufacturer's web site) that is labeled with the hook-up info. Then list the detectors that use that particular hook-up.
I coded up the database page this morning, I'll try to get all the coils I have measured added to it, and post the whole thing, by tomorrow. I divvied the info by manufacturer, with an "Other" section at the end.
And, I'm always interested ideas, so let's hear 'em!
- Carl
I coded up the database page this morning, I'll try to get all the coils I have measured added to it, and post the whole thing, by tomorrow. I divvied the info by manufacturer, with an "Other" section at the end.
And, I'm always interested ideas, so let's hear 'em!
- Carl
A
Anonymous
Guest
Good helpful work Carl! Thanks...
A
Anonymous
Guest
Carl, and all
One key question about the future of collectively authored information is how much control do you want to give contributors vs. how much work do you want to do. like you said, you created the coil database.
Here are two scenarios.
1. You create the on-line database structure but allow forum members fill in what they can for all to see immediately. This is no work for you.
2. You ask forum members to post database information to a special place and you update the database at a later time. This requires your work to update the database.
As you can see, the implications for collectively authored information will need to evolve as forum members come to expect the quality of information to improve, be easier to locate or more relevant to their task at hand.
The reason why I asked you to include the coil self resonant frequency is that one can deduce, by the Q of the coil, whether an internal damping resistor is mounted in the coil or in the plug. If it is mounted in the coil, it is probably optimized for one particular type detector. Internally mounted damping resistor coils would be less useful for those looking to get as faster response and experiment. Any damping resistors in the plug and be easily removed or changed.
The section on homemade or selfmade coils allows people to compare their own creations with those of others and build some range of expectations based on what others say about a particular coil design.
If all the information on this PI forum and your PI forum were edited and arranged in some logical way, it would be "The Definitive Pulse Induction Metal Detector Publication".
Thanks for asking.
bbsailor
One key question about the future of collectively authored information is how much control do you want to give contributors vs. how much work do you want to do. like you said, you created the coil database.
Here are two scenarios.
1. You create the on-line database structure but allow forum members fill in what they can for all to see immediately. This is no work for you.
2. You ask forum members to post database information to a special place and you update the database at a later time. This requires your work to update the database.
As you can see, the implications for collectively authored information will need to evolve as forum members come to expect the quality of information to improve, be easier to locate or more relevant to their task at hand.
The reason why I asked you to include the coil self resonant frequency is that one can deduce, by the Q of the coil, whether an internal damping resistor is mounted in the coil or in the plug. If it is mounted in the coil, it is probably optimized for one particular type detector. Internally mounted damping resistor coils would be less useful for those looking to get as faster response and experiment. Any damping resistors in the plug and be easily removed or changed.
The section on homemade or selfmade coils allows people to compare their own creations with those of others and build some range of expectations based on what others say about a particular coil design.
If all the information on this PI forum and your PI forum were edited and arranged in some logical way, it would be "The Definitive Pulse Induction Metal Detector Publication".
Thanks for asking.
bbsailor
A
Anonymous
Guest
Right now, I have no practical way to set up interactive databases. So, information would have to be posted to me, and I would add to the page. My entire web site is based on simple text files, and dynamically built as someone browses. I don't code anything in HTML anymore, so adding data is almost trivial.
Self-resonant frequency does not tell you the Q, nor the damping R. You could only derive self-capacitance from f<sub>o</sub>. To find the damping R, you need the Q, and maybe the series R. I've included columns for series R and f<sub>o</sub>, but not Q or parallel R.
- Carl
Self-resonant frequency does not tell you the Q, nor the damping R. You could only derive self-capacitance from f<sub>o</sub>. To find the damping R, you need the Q, and maybe the series R. I've included columns for series R and f<sub>o</sub>, but not Q or parallel R.
- Carl
A
Anonymous
Guest
OK, I've added a coil parameter page, click the link below. I'll clean up the formatting later. No data on self-resonance as I have not measured this. The "wire" column is for number of turns & wire gauge, i.e., "30T 28awg".
- Carl
- Carl
A
Anonymous
Guest
Carl,
What a great way to end the year.
Now the detector technical community has a single place to go for commercial coil data and to post data from homebrew coils.
I'm sure if we searched the PI technology forum pages on the word "coils" we could come up with the data for some of Eric's PI coils or even ask him to add to the database himself.
This may be the only detector coil database on the web. If there is another one, could someone please identify?
Carl, thanks for your effort.
bbsailor
What a great way to end the year.
Now the detector technical community has a single place to go for commercial coil data and to post data from homebrew coils.
I'm sure if we searched the PI technology forum pages on the word "coils" we could come up with the data for some of Eric's PI coils or even ask him to add to the database himself.
This may be the only detector coil database on the web. If there is another one, could someone please identify?
Carl, thanks for your effort.
bbsailor