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Bad coil test .... yes again!!!

R

ramases

New member
I know there's a sticky on this but I have had a conversation with the UK factory today about a duff 6X10. They say the coil test is ............ coil at waist height, Rx to 15, Tx Boost OFF. Now this isn't what we've been told is it? We have always been told to turn Tx Boost ON ........................ so which is it? The UK techie says that Carl @ the US factory has told them to test with it OFF .................... now I'm confused. Does anyone have an "inside track" on this?

:rant:
 
Yep it's RX boost on. We got that straight from Carl. On this I am 100% sure that is what Carl told us.

Bad Coil Test The best way to check your coil is to set your gain to 15, turn TX Boost on with the coil in the air (not on the ground or around other metal). If you don't get an overload, your coil is good. That is what the detector is designed for - not overloading at the extremes. The probe (zoom on the sensitivity live control) that suggests a recommended gain is not a good coil test.ak_1234 (engineer)

Perfect Coil Ideally, a perfect loop will give a recommended gain of 15 in the air, but that is not a necessary condition to call a loop "good". The D2 loops are coming out of the factory with extremely good nulls, but over time they can shift slightly, resulting in a null that may give a recommended gain of less than 15. The Eclipse 5.3 is being manufactured to exactly the same specifications of the D2, but on a V3 they consistently give a recommended gain of 10. You can easily run a loop that has a recommended gain of 8 all the way to 15 with no problem. Replacing such a loop with a more perfect loop would not offer any performance difference. White's will consider any loop that has a recommended gain of 8 or more in air to be a good loop. Carl

Rob
 
Hi Rob

Thanks for this ............... I will point the UK factory at this thread!!! I was sure I was right but had to get proof!

My prob is with my 6X10 that goes screwy as soon as it gets warm. I was out the other day (72F) and it went berserk. Brought it home - cooled it indoors overnight and it tested fine. Warmed it up again in the sun and overloaded. People have mentioned bad epoxy and the fact that there's no thermistor in the 6X10 but my previous (non-V) 6X10 was fine whatever the temperature.

Cheers.
 
Hi Ramases, now you have me really confused! out yesterday morning in the heat with my V3i on growing crops (9 inch: high) using the 6x10 coil on the standard Coin and Jewelry with an RX of 15 no trouble. Read your post and nipped out into garden to try rx15 tx boost on and had my ears blasted with the overload tone. This coil has been tested last month and past OK.
John.
 
flenj said:
Hi Ramases, now you have me really confused! out yesterday morning in the heat with my V3i on growing crops (9 inch: high) using the 6x10 coil on the standard Coin and Jewelry with an RX of 15 no trouble. Read your post and nipped out into garden to try rx15 tx boost on and had my ears blasted with the overload tone. This coil has been tested last month and past OK.
John.
Click to expand...

Hi John

Sounds just like mine. Do me a favour and chase James in Inverness will you ..... he doesn't seem to believe there is an issue!!
 
It's true that I've instructed UK to test V-loops at Rx=15 and TXB=off. As we've gotten more long-term data on our V-nulled loops it has become apparent that nulls are shifting slightly over time. This results in loops that may overload at Rx=15 and TXB=on. Replacing a loop is usually only a short-term solution as the replacement loop may eventually shift as well, and 6 months later the customer is wanting yet another loop.

It's an unfortunate reality of the manufacturing process that things like this take a long time to see clearly. I am personally working on this issue, but possible solutions also take a long time to evaluate. Meanwhile, we will replace loops if they overload at Rx=15 and TXB=off.

- Carl
 
I prob shouldn't have said "believe", I just don't think he can get his head round the fact that even mildly warm weather can possibly screw a coil. Seems I'm not the only one with the issue though ......
 
For what ever reason the 6x10 coils have been trouble free. The 5.3 for the most part would read suggested RX 10 but would not overload. I have 6 v rated coils, all go RX15, boost, and no overload. Rob
 
Carl-NC said:
It's true that I've instructed UK to test V-loops at Rx=15 and TXB=off. As we've gotten more long-term data on our V-nulled loops it has become apparent that nulls are shifting slightly over time. This results in loops that may overload at Rx=15 and TXB=on. Replacing a loop is usually only a short-term solution as the replacement loop may eventually shift as well, and 6 months later the customer is wanting yet another loop.

It's an unfortunate reality of the manufacturing process that things like this take a long time to see clearly. I am personally working on this issue, but possible solutions also take a long time to evaluate. Meanwhile, we will replace loops if they overload at Rx=15 and TXB=off.

- Carl
Click to expand...

Hi Carl ............ thanks for this ................ is it the same for the US or just the UK? And, a coil that goes out of adjustment during a hunt due to the effect of the ambient temperature (72F) .... what is you take on that - surely it cannot be reasonable only to be able to use a coil on cool days?

Thanks.

Colin.
 
Carl-NC said:
It's true that I've instructed UK to test V-loops at Rx=15 and TXB=off. As we've gotten more long-term data on our V-nulled loops it has become apparent that nulls are shifting slightly over time. This results in loops that may overload at Rx=15 and TXB=on. Replacing a loop is usually only a short-term solution as the replacement loop may eventually shift as well, and 6 months later the customer is wanting yet another loop.

It's an unfortunate reality of the manufacturing process that things like this take a long time to see clearly. I am personally working on this issue, but possible solutions also take a long time to evaluate. Meanwhile, we will replace loops if they overload at Rx=15 and TXB=off.

- Carl
Click to expand...

Sorry Carl you personally are allways helpfull, but to say "It's an unfortunate reality of the manufacturing process that things like this take a long time to see clearly" is not good for Whites reputation ! Since buying my V3 detector I have had the coils changed and finally the detector itself, so not good I am sorry to say......
 
The new coil test parameters are for the US as well, I just updated the sticky above.
 
There is no need to feel lost, the vast majority of the D2 coils works fine even if they don't test to have a perfect null. If you can get RX8, Boost off with no overload the coil is good.
 
The slight shift isnt the problem.Its when the D2 gets down to a recommended gain of 3 or 4 in areas where it would usually recommend 15.When this happens and you try to run a gain of 7 or 8, the coil causes severe falsing (exactly like severe EMI) that it shouldnt,where as with a properly nulled D2 running the RX at 10-12 in the same area isnt a problem.Ive had one D2 replaced by Whites,had the second one do the same thing as the first (and yes,it was over the course of about six months,maybe a little less).I was going to send the second one back but found my dealer had a brand new one in stock for $149 that was V rated,so I bought it since it was the start of the season.Ive still got the second D2 that I got from Whites and the performance difference between that one and the new one I bought from my dealer is NIGHT & DAY.....so far
 
What percent of coils are defective? I sure would LOVE to see a poll of V3 users to get an idea. Maybe add what environment you hunt. It's almost 100 plus time in my area. Ug.
 
By all means, if your coil is bad, get it in for a replacement. The question here is the testing parameters. I use White's and non-White's coils at RX-8, Boost off and they work fine for me.
 
Sorry guys after Carl's post I'll change my notes and Larry edited the sticky.[attachment 163185 2010-05-24_235909.jpg]....Rob
 
I agree with Larry. I had read that if you can't run rx 15 with tx boost on means the coil lost it's null? So I called whites and Todd sent me another one. I tested both side by side and the one that lost it's null seemed more stable and every bit as good as the new one. I could run rx 8 with boost on. It also seemed to have less interference from EMI. I believe whites is going out of their way to replace these coils and we should all be happy that a company will go that far especially when something as this has come up.
 
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