Do these machines anylyze in all 28 freqs.?
e-trax or ctx3030
- Thread starter skeeter86
- Start date
- Jul 24, 2005
- 4,602
- 1,226
- Detector(s) used
- Call for your Treasurenet special discount! Be sure to mention Tnet when you call!
- Primary Interest:
- Metal Detecting
I believe Minelab says they transmit in 28. Not sure that is says analyze.
Fletch88
Silver Member
- Mar 7, 2013
- 4,841
- 2,368
- Detector(s) used
-
Garrett ATPro- 8.5x11, 5x8, CORS Fotune 5.5x9.5
Tesoro Silver microMax- 8 donut, 8x11 RSD, 3x18 Cleansweep
Minelab Excalibur ll- 10" Tornado
Minelab CTX 3030
Minelab Xterra 305
- Primary Interest:
- All Treasure Hunting
http://www.dankowskidetectors.com/discussions/read.php?2,17225,17285 I believe FBS detectors select 11 sets of unevenly spaced frequencies (not of the same harmonic family) out of the 28 frequencies.
Last edited:
Jackalope
Full Member
- Jun 27, 2009
- 243
- 167
- Detector(s) used
- White's, Garrett, Minelab
- Primary Interest:
- Metal Detecting
FBS detectors utilize a high freq of about 25 kHz and a low freq of about 3.125 kHz. The other advertised frequencies are just harmonics of the low freq and aren't used at the receive coil, though Minelab is correct in saying they are transmitted, there are many weak harmonic freqs transmitted - but they aren't used for any purpose.
The Noise Cancel feature shifts the frequency slightly up or down. The normal high freq of 25 kHz,which would normally be Channel 6 would be pushed to 27.78 kHz if Channel 11 were selected or dropped to 22.2 kHz if Channel 1 were used. It is enough to move the detector away from interfering radio bands - but not enough to make much of any difference in sensitivity (though some would argue it does).
The rest of the miracle of FBS technology is how it analyzes the X and R components of the received signal (and ground signal). It is like a PI in a sense in that it uses the time constant of the target signal to measure the signal components at points along the decay curve and then compare them. It's pretty clever.
The Noise Cancel feature shifts the frequency slightly up or down. The normal high freq of 25 kHz,which would normally be Channel 6 would be pushed to 27.78 kHz if Channel 11 were selected or dropped to 22.2 kHz if Channel 1 were used. It is enough to move the detector away from interfering radio bands - but not enough to make much of any difference in sensitivity (though some would argue it does).
The rest of the miracle of FBS technology is how it analyzes the X and R components of the received signal (and ground signal). It is like a PI in a sense in that it uses the time constant of the target signal to measure the signal components at points along the decay curve and then compare them. It's pretty clever.
