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Offline bernte_oneTopic starter
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« Reply #50 on: May 20, 2015, 06:39:16 am »
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have sold my Admiral to a Forum member from (Partner) detektorforum.de for my self build cost
it will be in use on heavy contamined Roman camp site in Germany
i hope to get feedback how it performs in real Action

while writing with the collegue i noticed some things than can be done better in future detector
- build in fm Transmitter (directly as second pcb in box)
- sealed headphone connector industrial Standard 6,35mm
- a smaller (16,5cm) and a bigger coil (maybe 36cm)   the small for trashy areas and the bigger for allmetal Militaria hunting
- etched scale ring and text when using alu box again

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my machines at work http://mueller-meteoriten.de

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Offline leonardo
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« Reply #51 on: June 08, 2015, 01:12:29 pm »
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« Reply #52 on: June 11, 2015, 07:09:30 am »
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Quote:Posted by bernte_one
have sold my Admiral to a Forum member from (Partner) detektorforum.de for my self build cost
it will be in use on heavy contamined Roman camp site in Germany
i hope to get feedback how it performs in real Action

while writing with the collegue i noticed some things than can be done better in future detector
- build in fm Transmitter (directly as second pcb in box)
- sealed headphone connector industrial Standard 6,35mm
- a smaller (16,5cm) and a bigger coil (maybe 36cm)   the small for trashy areas and the bigger for allmetal Militaria hunting
- etched scale ring and text when using alu box again


hello bernte I can't reply on your PM it geotech it say you're inbox is exceeded and cannot accept more message.

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Offline cvele61
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« Reply #53 on: July 10, 2015, 09:32:19 am »
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hi guys
here is my version of md ADMIRAL1. I made it a few months ago and it is fine little vlf machine.
In the air it goes 35/40cm with coins but with geotech vdi  depth drop to 15/18cm (in the air!)
Coil is (at the moment) DD 27cm (10"), but i will go to CC25cm this days.If someone solve vdi calculator
from geotech it will be nice to see.http://

Posted on: July 10, 2015, 08:55:20 am
ps

There is uploaded video on YouTube titled as ADMIRAL1 VLF METALDETECTOR

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Offline xavier
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« Reply #54 on: July 10, 2015, 10:32:42 am »
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Looks like you did a very nice job there mate, well done to you.

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Offline cvele61
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« Reply #55 on: July 10, 2015, 11:44:03 am »
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Thank You Xavier
but I will be satisfy with this project when make vdi funcional.
Actually, I made few metal-detectors  successfully (tgsl, clone pi-w, volksturm sm+,
chance pi ...) but admiral3 make me insane, its too unstable  and it will be a problem
for me to find out why. Maybe overflow the op.ams. with strong signals from RX, but i have
to measure values on them.
I apologize because of my bed english and hope You can understand me   
 

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Offline xavier
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« Reply #56 on: July 10, 2015, 01:54:32 pm »
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No problem mate, you keep up the good work  Great

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Offline bernte_oneTopic starter
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« Reply #57 on: July 11, 2015, 01:15:29 am »
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hello cvele

admiral is very strong, seems that it has a dangerous amp stage
did you ever try a naked coil (unshielded), in real grouind my runs better with unshielded   - dont know why
the onboard trimmer is to adjust very carefully

i hope we can find correct connection points for vdi
one men from youtube did it and it works good

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Offline xavier
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« Reply #58 on: July 11, 2015, 03:17:11 am »
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What on board trimmer mate?

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Offline cvele61
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« Reply #59 on: July 11, 2015, 04:08:19 am »
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hi guys
on board trimmer is 100k, and TX osc trimmer is 200R (around 120R tuned for best amplitude in my  case).
No, I have not tried  coil with no shield because i was afraid that geb wont work. I intent to make cc
coil so i will try  it in real soil without shield.

Posted on: July 11, 2015, 04:01:44 am
PS
 I forget to say that it is very important, for my admiral, producer of TL074 because
there are different amplification among them.

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