Post By Terry Soloman
Jun 06, 2012, 05:03 AM
Sand Shark Question ??
I have 2 minelabs the Sovereign GT and the Excal II and just purchased a brand new out of the box Sand Shark.
Now my question is : is the Sand Shark threshhold suppose to vary in tone most all the time ?
I am used to the Minelabs STEADY TONE or pitch but this Sand Shark tone varies in pitch (not volume.)
I can find no way to adjust this machine to get it to settle down.
I am on the east coast of Georgia and work the salt water & wet sand.
Could someone please give me a little insight on this?
Thanks in advance !!
Jun 06, 2012 05:03 AM
Jun 06, 2012, 12:22 PM
Jun 06, 2012, 01:26 PM
You should have a steady threshold in both Normal and VCO mode. Set your pulse width at about 230pm, and your Threshold around 12-1pm, and your volume to ear. If you cannot get the threshold to steady out, make sure you are running your coil cable straight up the lower shaft, and not wrapping it the way it is shown in the manual. Wrap only ABOVE the lower coil. The other concern is EMI with Pulse machines. If you just can't get it to settle out, Call Rusty Henry at Tesoro, and run it by him.
Originally Posted by GeorgiaSwinger
Jun 07, 2012, 04:53 AM
The tone waviers in vco or normal . I'll try that Terry next time out to the beach, and if that doesn't work will go to another beach to see if it's emi.
Thanks guys !!
Jul 07, 2012, 07:19 AM
Originally Posted by Terry Soloman
Terry, or others, can you please explain the why of this and how it will perform better. Should your post also read "wrap only above the lower shaft"?
I have a SS, several years old and works fine, one of the later units with the removable coil.
I run two long helix wraps on the plastic portion of the shaft,then tight wrap the excess just below the "S" bend. I prefer to keep the coil wire secured so that it does not get damaged in the surf.
I want to further optimize performance and am curious if the wire route you mention will help.
Any photos of your rig posted on TN or possible for you to upload so we can see a visual of the wire route?
Last edited by JKPK1; Jul 07, 2012 at 07:22 AM.
Jul 07, 2012, 08:25 AM
I have no empirical evidence to back my theory other than personal experience on the beach. In my own tests, wrapping the cable wire down close to the coil INCREASED EMI on one of the beaches I love to hit that has a CCTV system. I talked to a buddy that suggested I try this style of wrap, and it cut the interference in half!
Originally Posted by JKPK1
Jul 07, 2012, 11:35 AM
Originally Posted by Terry Soloman
Mine is similar but different. I have the same number turns of wire on the plastic pole area. I did wrap the rest of the wire, further up the on the handle than yours.
Unrelated, and maybe yours is done this way also, the oem coil alignment seemed to always have me catching an edge on the side to side swing. I removed the metal pin clip on the plastic rod. Using the clamp, I made some test swings to optimize the coils angle in relation to the rod "S"bend. Then carefully redrilled the plastic rod. Reinstalled the pin clip. Basically customized the ergonomics for a better swing. While not 100% reversible, the pin clip can be installed back into the original holes, and the plastic rod merely has two additional holes that would be covered by the aluminum handle anyway.
Jul 07, 2012, 11:58 AM
Coils in radios are tuned by moving a metal slug into or out of the coil. Removing coil that has no metal core would tune the remaining coil to have the slug(metal core) completely in the remaining coil of wire. Apparently this tunes out some interference.
It's no wonder truth is stranger than fiction. Fiction has to make sense. Mark Twain
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