Hi,
This is an extensive test result table comparing the detection distance of meteorites of various types and weights between a White's Spectra V3 set in 'meteorite search' mode and a PPM.
It clearly shows that the maximum detection distances are much larger with the PPM for not only the ferrous types like the siderites but also the Chondrites H, L and LL.
It is true that the Achondrites are not detected but they are neither by the VLF .
This test has been reported here on a french-speaking forum:
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http://meteorites.superforum.fr/t38...tif-magnetometre-ppm-vlf-spectra-v3
It is also to be noted that a VLF or a PI only detect the targets right under their coil at the published distance while the PPM detects them even on both sides of its sensor. If the distance of detection of a given target is one meter, it will be detected at one meter deep but also at one meter on each side of the sensor path. This means that the sensor of a PPM has NOT to be swing'ed which makes the survey much more comfortable.
Just as a reminder, look at this web site to find a good PPM with a very reasonable price tag:
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http://users.skynet.be/fa352591/index.htm
Willy
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http://www.thunting.com/smf/index.php/topic,22740.msg161734.html#msg161734
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