I am a newbie to this hobby and just recently purchased a Fisher F4. I live in Canada and currently still have 6 feet of snow in my front yard. The option of switching coils seems to be a little cumbersome so I made a lower extension arm that clips to the main shaft and has the 4" coil attached. I can switch between the primary large coil being used and the 4" coil in seconds. I don't know how this will work in the field, but am ansiously awaiting warmer weather to try it out. I included some photo's to show off my little idea. The idea is to unplug the main coil, plug in the 4" coil unclip the extension arm and be ready to pinpoint in trashy area's or along foundation or fence lines. This may be a total waist of time but I like it, and wanted to share with other people and get some feed back.
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F4 Modification for 4" coil
- Thread starter $$Scott$$
- Start date
Keith Southern
Active member
towards the top and have the pole towards the bottom.and at that i still wouldnt do it unless the pole is fiberglass you are going to mess up your radiation pattern of your coil you may not notice it but scan that little coil across the coil hooked up with machine on it will sound of quite loud. Im sure it will mess up your discrimination also think of it as hunting next to a metal fence all the time.the flip might work better since some poles are metal all the way to the coil but there stationary and mounted to the coil with it above the coil I belive you will get a lot falsing running your detector like this.
Its a good thought though do like I do and carry another rod setup with a small coil in the truck then when you need it just swap out.heck most of the time i just run the small coils exclusively there pretty deep and the disc works better usually.
hope this helps I may be wrong but you'll know more by testing it.
Keith
Its a good thought though do like I do and carry another rod setup with a small coil in the truck then when you need it just swap out.heck most of the time i just run the small coils exclusively there pretty deep and the disc works better usually.
hope this helps I may be wrong but you'll know more by testing it.
Keith
Scott is that you in the last photo ?
j/k - I have to admit that's a pretty innovative idea....it would be cool to make a small switch box so you could just toggle between coils on the fly, and possibly mount the 4" coil on a smaller hand held pole, for getting inside holes and such...hmm....could be the the next best thing to a Sunray
j/k - I have to admit that's a pretty innovative idea....it would be cool to make a small switch box so you could just toggle between coils on the fly, and possibly mount the 4" coil on a smaller hand held pole, for getting inside holes and such...hmm....could be the the next best thing to a Sunray
The pole that I used is actually wood, the brackets are far enough away from the coil that they do not interfere in the field. I took your idea of spinning the 4" coil towards the top and it works great. Thanks for that. If you notice in the photo's the brackets are attached to the auxilary pole so you can mount it any way you wish.
I work in Silicon Valley so I'm sure I can round up a suitable switch at one of these bits and pieces electronics shops, along with suitable 5-pin connectors to make a switch box. I would like to get a 4" coil, crack it open, and see if the internals couldn't be placed inside something more akin to the Sunray probes....wouldn't that be slick ? Sunray isn't going to make a probe for the F2/F4, but there may be hope left yet
I have added some photo's showing the position of the Aux. shaft with the coil at the top and some of the smaller areas that are hard to see in the main photo's. I should make it clear that the shaft is a 1" wood dowel, the metal brakets are 12" away from the coils, so hopefully that doesn't create a problem in the field. Also someone posted to my early messages that I could have problems with the 4" coil being so close to the main coil when turned on. If this is true than hopefully by placing the 4" coil at the top as I have in these photo's it won't cause problems. If anyone knows the answer to this let me know, so I don't wreck my unit before I even get to use it outside. THANKS!!!!