Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Registered members
Current visitors
Charts
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Metal Detectors
Detector Accessories
NuggetFinder 25" DD X-Search First Impressions
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support Prospecting Australia:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="mbasko" data-source="post: 496261" data-attributes="member: 4485"><p>By design DD coils are less susceptible to noise from ground mineralisation, ground moisure, charcoal etc. as well as EMI.</p><p></p><p>It is my understanding this is due to the configuration of the DD - i.e. 2 x D shaped loops that overlap in the centre.</p><p>The DD configuration cancels out these signals above that would normally cause interference in a mono coil. </p><p></p><p>Mono coils detect signals in a sort of a triangular shape detection pattern being wide at the top to a point at max depth (like in the diagram I previously posted). </p><p>This area or detection pattern is known as a positive detection field. </p><p></p><p>The positive detection field of a DD coil is only the centre section (like an "I" beam as per the previously posted diagram). </p><p>The right & left D loops on each side are a negative detection field - meaning that they give the DD coils the cancelling effect. </p><p></p><p>The new NF XDD coils have no other "magic" than other DD coils (as far as I'm aware but happy to be corrected) other than being part bundle wound & part spiral wound which I'm guessing would be to maintain the DD cancelling characteristics but also enhance sensitivity over normal bundle wound DD coils.</p></blockquote><p></p>
[QUOTE="mbasko, post: 496261, member: 4485"] By design DD coils are less susceptible to noise from ground mineralisation, ground moisure, charcoal etc. as well as EMI. It is my understanding this is due to the configuration of the DD - i.e. 2 x D shaped loops that overlap in the centre. The DD configuration cancels out these signals above that would normally cause interference in a mono coil. Mono coils detect signals in a sort of a triangular shape detection pattern being wide at the top to a point at max depth (like in the diagram I previously posted). This area or detection pattern is known as a positive detection field. The positive detection field of a DD coil is only the centre section (like an "I" beam as per the previously posted diagram). The right & left D loops on each side are a negative detection field - meaning that they give the DD coils the cancelling effect. The new NF XDD coils have no other "magic" than other DD coils (as far as I'm aware but happy to be corrected) other than being part bundle wound & part spiral wound which I'm guessing would be to maintain the DD cancelling characteristics but also enhance sensitivity over normal bundle wound DD coils. [/QUOTE]
Verification
Post reply
Metal Detectors
Detector Accessories
NuggetFinder 25" DD X-Search First Impressions
Top