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Has the G2 been sent out to dealers yet??? If not how soon can we expect them.... Thanx.

Thanks Dave for the informative replies, I also bought GB from "C" company and I love it. It's stable, quiet and very sensitive with good depth. I too have been pestering FTP about a 11" DD specificly tuned to the resonant frequency of GB. They claim that they are working on it and should be out soon, is that so? I've
been told you can use the omega loop, but I think the freq. mismatch will throw the Q off and loose depth. I know you are very busy Dave, but if if can confirm
that a 11" DD for GB is in the works I would appreciate it.

Thanks

Tim

P.S. A heads up hint on Quality inspections. The first GB's had to be returned. 1. When turned on outside no bootup only locked in overload. 2. Next one was missing the metal indent clip in rod and no instruction manual. The third one is great!
 
Would you care at this time to clarify what has been mentioned regarding the audio change of the Gold Bug SE versus the C-version? Is it a change in the audio frequency of the tones, tone duration (audio length) or something to do with the iron volume?

Thanks
Tom Z
 
Thanks, Vegas49. Experimentally we've been putting Tek "Frat Bros." series 11 inch DD searchcoils on Gold Bugs with no problem. However we are keeping an eye out for production variation since as you say these coils are aligned at 7.8 kHz and the alignment is not exactly the same at 19 kHz. In the end we may discover that to avoid production fallout we have to align the coils at 19 kHz even though so far we have not found any problem. To put it all another way, a Frat Bros. 11 incher will very likely work just fine on your Gold Bug but for now we make no guarantee of that.

Jackpine, we'll have a list of the differences between the original GB and the "real dealer" GB & its brethren about 15 minutes before they hit the shipping dock. Whenever that finally happens. But thanks for repeating your version of the audio shopping list.

--Dave J.
 
vegas49 said:
Dave, will the G2 11" DD be designed for it or will you use the 7.8 khz frat bros. loop?

Thanks

Tim
Click to expand...

I expect it to be a frat bros. loop. If we run into production yield problems with that, we'll align it at 19 kHz and will mark it in some way so that a person can look it and know which version they have.

--Dave J.
 
OK Dave, thanks again for that info...I do hope you bring out a new 19 khz aligned loop. In the meantime I am going to look into possible after market solutions.

Tim
 
vegas49 said:
OK Dave, thanks again for that info...I do hope you bring out a new 19 khz aligned loop. In the meantime I am going to look into possible after market solutions.

Tim
Click to expand...

Tim, as far as I know there are no aftermarket Frat Bros. loops. Also keep in mind that the Gold Bug platform is designed to work only with DD searchcoils and not even the Frat Bros. concentrics will work on it properly unless you get lucky.

In the long run, the Gold Bug platform deserves to have more than just two searchcoils available for it. We have under development a searchcoil for the Gold Bug platform which is different from anything that's been seen before from any manufacturer. It 'll probably work on the Tek Frat Bros. machines, too. ........ No comment on what's different about it or when it may be available. The only reason I say anything at all is to illustrate that when it comes to searchcoils, we're not asleep at the wheel.

--Dave J.
 
Dave, that new coil sounds promising, I just hope it doesn't take a year to come out! I'm still leary of the Q factor on the omega coil and from what I've read of azsh07's test. the grd. bal. was off by 7, though that can be adjusted manually. He said the depth was same as 5", around 7 - 8" on a dime. The 11" should be a little deeper unless the inductive balance of the TX and RX loops are off. Assuming they are not, it has to be the frequency of the TX loop (19 vs 7.:geek: . Anyway that is why I'm leary to spend $200 for a coil that might not provide optimal performance. You are right Dave, the GB is to new and there are no after market loops yet.
I would like to state that the advertising of an optional 11" DD coil was misleading as was FTP-Fisher when I inquired. I assumed the coil would be totally tuned to the GB's freq. instead of a offset hand me down..That aside I really appreciate the info you have provided.

Thanks

Tim
 
Vegas49, a lot of people post stuff about searchcoils on forums who think they sort of understand searchcoils based on experience, but don't actually understand the electronics. This results in a lot of "urban mythology". And it sounds like you've been too influenced by that. Some coils work nicely over a wide range of frequencies: in fact on a multiple frequency machine, the searchcoil has to work well over a broad frequency range. We chose the Tek Frat Bros. DD searchcoils for the Gold Bug platform because we found that they worked well at 19 kHz. So far not a single coil has been aligned at 19 kHz. We are doing sample monitoring of alignment at 19 kHz to make sure our manufacturing process is under control, and will create a separate series of coils aligned at 19 kHz should that prove to be necessary to maintain the process under good control.

I read a post somewhere, where a person stuck an 11 incher not from the Frat Bros. series (I think it was an F75 coil) on a Gold Bug and of course did not get good results because the inductances were not correct for the Gold Bug circuit. I don't remember if that was azsh07's experiment or someone else's.

--Dave J.
 
I thought this was suppose to be a Teknetics Forum,and this thread was about the new Teknetics G2 all the talk seems to be about the gold bug?

I have pre ordered a Teknetics G2 I hope my new G2 has a properly calibrated coil to match the 19 kHz especially having to wait all this time

I pre paid for mine because the adverts stated a late April release date?

This was then put back to July?

I am now told by the dealer I ordered from don't expect it until August?

To be honest I am getting very frustrated I may just get my cash back and buy a machine from a company that actually stocks what they claim they make
 
Sorry pennyfarthing, wasn't hijacking the thread, but wanted to ask Dave J. about Tek 11" DD working optimally with G2 & GB since they are same platform. If you read what he said, they will be using the Greek 7.8 khz coil on the G2. As he said it should work well. Only thing is well is not as good as perfect match. Maybe that is what they want. If it was totally tuned to the 19 khz circuit it would probably surpass the T2 & F75 LTD's depth. Also they save money not have to produce new coils or change a capacitor or/and change program. It's a shame cause it really is a good machine, but when you cut corners you also cut efficiency.

HH

Tim
 
Hi Tim

No problem mate,the only reason I have not asked my dealer for my money back is because it sounds such a good machine,maybe even better than a T2 for UK conditions

It is a bit of a concern though that the G2 is suppose to come with an 11" DD as standard, so it should be totally tuned to the 19 khz circuit to match the detector

It seems corners are being cut I agree

The Gold Bug's small 5 inch DD search coil that comes as standard is totally tuned to the 19 khz circuit so the G2 coil that comes as standard should be also tuned for the 19 khz

There is no excuse really they have until August to sort it out unless of course they delay the release date by another 2-3 months

I have decided to give Teknetics the benefit of doubt and wait until August but if the release date is pushed back any further me and quite a few UK buyers will simply go and purchase a certain French detector

The thing that really annoys me if the G2 or the gold bug was not ready for release they should not gone ahead and advertised it so early
 
First of all apologies for this being my first post on this forum, I like pennyfarthing have been waiting for the arrival of the G2 and have been disappointed with the delay but accepted this due to unforseen problems. Now it seems the new G2 when it eventually arrives will be fitted with a coil from a different machine! I am not electronically minded so have a very limited understanding of frequencies, however knowing that the G2 is 19khz and the coil that will be used is a 7.8khz does'nt give me alot confidence that I'l be buying a machine with the optimum performance. I therefore will be holding on to my British Pound until these problems are sorted!

S.Wales.
 
I agree with you both. I bought my GB from Cabellas for the main purpose of meteorite, relic & some nugget shooting, so I definitly need the larger sweep area. I still have over a month left to make my decision to return it or not. I really hope they come out with a match coil cause I really like the unit and I'm sure you will to. One thing I admire White's is that they do not advertise befor a new unit comes out, I think FTP should start doing the same. What is the name of this french MD?

HH

Tim
 
For all the worrywarts, it's a tiny bit like having an 8-Ohm amplifier and you have a 6- or 10-Ohm speaker. Either will still work and you'll see no difficulties.

It's also similar to matching a CB antenna to the impedance of the transmitter. A 200% mismatch really only equates to about a 10% difference in performance. There is probably almost as much variation in any coil, made for any machine, because in practice, the complex windings of multiple coils will never match exactly from one manufactured unti to the next.

To have a machine that requires such a precise match in order to deliver optimum performance would tend to mean nothing but recalls. You might end up with a unti that won't work properly unless it has the only the coil with which it was originally shipped, or it would require factory-level calbration anytime you changed coils. What good is this? You need a machine that can be reasonably expected to operate in spec within a rather broad range of individual parts values.

By all means, hitting the nadir or optimum setting every time out of the chute would be great. But, given the hundreds of individual parts that make a single detector, about all you can do is aim for something that will work out of the box, given the many various subtle differences normally encountered in day-to-day assembly runs.

Here's one more analogy. Take an AM radio and notice the frequency range covered is over 3x. Yet, we think nothing about how "performance" is compromised from the low end of the band to the high. Yet, the equations for "optimum" antenna vary from a few hundred feet in length to about 1/4 mile! There are obviously ways to create an antenna or coil that will respond predictably and accurately over this broad range that will take some very precise calculating to improve response enough to justify the added complexity or individual unit fine-tuning that such a precise winding might require.

-Ed
 
Why would this site say they have them in stock?

http://stores.goldenroad-enterprises.com/-strse-153/TEKNETICS-G2-Metal-Detector/Detail.bok

Hmmmmm
 
Thanks, Ed, excellent explanation.

There are some metal detectors that have to be matched to an individual searchcoil. However, in nearly 30 years of designing metal detectors, I have never designed a machine that had to be matched to an individual searchcoil, except for models that didn't have a loop connector and therefore interchangeability was irrelevant. If I designed it and it had a loop connector the loops were interchangeable.

There are some searchcoils that are designed to run within only a narrow frequency range, and others that are designed to operate over a very broad frequency range, and coils that are in between those two extremes. For the last 25 years or so, I have been shifting away from tuned coils to untuned to broadband, and for the last 15 years the only tuned coils I have done were for the purpose of backward compatibility to designs I inherited from other designers.

I've had well known engineer names in this industry say to my face that searchcoils in order to work well, have to be tuned to a specific frequency. They're not working in this industry any more. Can you imagine good engineers like Bruce Candy or Carl Moreland or Jack Gifford claiming that coils must be tuned to a specific frequency in order to work well? Nope, it's unthinkable.

CZ searchcoils are concentrics, they are untuned, they run at 5 and 15 kHz simultaneously, and they're interchangeable. Been that way for 19 years. For most of those 19 years the CZ's were Fisher's top of the line, and some say they still are.

As I mentioned earlier in this thread, there is a lot of popular urban mythology kicking around in beeperlandia relating to how searchcoils work, that's just plain wrong. I don't usually spend much time trying to get folks straightened out on searchcoil urban mythology because usually the misinformation is relatively harmless. In this case however I regard the urban myth that a broadband coil design is inherently inferior to a tuned one, as a myth needing to be corrected.

And, as I already said in an earlier post but perhaps it didn't quite register, to date we have not aligned a single GB platform searchcoil at 19 kHz. Anyone who has a C-company Gold Bug is already swinging a 5 inch searchcoil aligned on a 7.8 kHz "Tek Frat Bros." alignment fixture.

--Dave J.
 
Dave thanks for that post. This is very interesting because I've always heard (and by some pretty knowledgeable folks in beeperlandia) that the CZ's were calibrated/tuned to match the 8" search coil they shipped with.

Perhaps that's different then saying the coil has to be tuned to a specific frequency :shrug:

Thanks for your expertise on the forum, I'm learning quite a bit.

HH,
Brian
 
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