|Posted on March 27, 2012 at 7:55 AM|
In the White's V3i manual it mentions that the V3i can get more depth by channeling all of its power to a single frequency. I had been thinking about trying Single Frequency mode at my "hunted out" sites for a while, so I decided to get back to a site that will be undetectable in another week or so due to the rapidly growing vegetation. I was thinking that single frequency may give me the edge I needed to get what I may have missed before, and I was right!
The three frequencies that are available are 2.5 KHz, 7.5 KHz, and 22.5 KHz. Lower frequencies are better for silver and copper coins, but the detector loses sensitivity to low conductive targets like gold and small buttons, so I decided not to go with 2.5 KHz. Instead I chose to work with 22.5 KHz, but quickly realized that I was getting a lot of positive readings from iron. I switched to 7.5KHz and it did away with the iron problem. This frequency is a great compromise for both coins and gold.
Almost immediately I was easily getting deeper signals using this frequency. I dug some deep tiny junk, and then an Indian Head that read solidly at 7.5 inches. I was surprised how clear and consistent the signal was! Much better than Best Data! A few minutes later I got a tiny ball button which was also fairly deep but gave a bouncy signal which is typical of these tiny pieces of metal.
After a while I got a solid 79/80 VDI reading at 8 inches. Again I was surprised at the strong, consistent signal. Hoping to find a Barber or Mercury Dime, I was thrilled to see a small copper coin, which I immediately recognized by its size as an early US Half Cent. (This was Half Cent number three for 2012. Prior to this year I had only dug two half cents since 2001!)
While secondary to raising gains (RX, All Metal, and Discrimination), single frequency is a great way to add a few more inches of depth!
For more information on how frequency affects VDI and sensitivity, see my VDI Normalization chart by clicking here
Categories: Metal Detector Reviews and Field Tests