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Selecting Ground Filters
http://forums.whiteselectronics.com/showth...-Ground-FiltersFolks have been askin' for some information on selecting Ground Filters. Most are askin' about Sweep Speed.
The below chart will help you select the best Ground Filter for your sweep speed. If you want to take into consideration Ground Mineralization and EMI, then the chart will help point you in the right direction using those factors as well.
How to read the chart ..... Let just take a couple of examples.
Using ONLY Sweep Speed:
.5 to 1.25 fps = 5Hz
1.5 to 1.75 fps = 7.5Hz
2.0 to 2.25 fps = 10Hz
2.5 fps and up = 12.5Hz
A "rule of thumb" to remember is:
Ground Filter = Sweep Speed X 5.
Using ONLY Mineralization:
Very Low Mineralization = 5Hz
Low Mineralization = 7.5Hz
Moderate Mineralization = 10Hz
High Mineralization = 12.5Hz
Using ONLY EMI:
Low = High Pass
Higher EMI = Bandpass
If your sweep speed is 1.65 fps then you would want to use the 7.5Hz filter. (1.65 X 5) = 8.25, which is closer to 7.5 then it is to 10.
Like my previous Recovery Delay chart, this information is meant ONLY to "get you close". YOU decide what factors you want to drive the filter selection. Then, optimize your settings in the field.
I will offer one suggestion .... You CAN change your physical sweep speed ....
You CAN'T do anything about Ground Mineralization or EMI. If you find yourself in a HIGH Mineralization and HIGH EMI environment, then you want the 12.5Hz High Pass filter.
In other words, in priority order, select the best filter considering;
o Mineralization first
Using ONLY EMI: o EMI next
o Sweep Speed last
Adjust your physical sweep speed a bit for the best target response after selecting the best filter for the environmental conditions.
Hint: At any level of mineralization, the slowest sweep speed that you are comfortable with will generally produce the best results. A "good average" sweep speed is 1.50 to 2.25 fps.
Using ONLY EMI: o EMI next
o Sweep Speed last
Adjust your physical sweep speed a bit for the best target response after selecting the best filter for the environmental conditions.
Hint: At any level of mineralization, the slowest sweep speed that you are comfortable with will generally produce the best results. A "good average" sweep speed is 1.50 to 2.25 fps.
Using ONLY EMI: o EMI next
o Sweep Speed last
Adjust your physical sweep speed a bit for the best target response after selecting the best filter for the environmental conditions.
Hint: At any level of mineralization, the slowest sweep speed that you are comfortable with will generally produce the best results. A "good average" sweep speed is 1.50 to 2.25 fps.
http://forums.whiteselectronics.com/showth...tingsEstimating Optimum Recovery Delay Settings
There has been some discussion on the forum since the release of V3 regarding Recovery Delay and how to set it .... I have set up a chart showing RD time settings for four (4) coil sizes - 4", 6", 9.5" and 10", deployed at sweep speeds ranging from .5 ft/sec to 5.0 ft/sec. The "average detectorist" swings somewhere between 1.5 ft/sec and 2.5 ft/sec. At 2.0 ft/sec it will take 2 seconds to swing a 4' arc in one direction.
First off, definitions: Recovery Delay settings are just as the name implies - the delay time that you are imposing on Spectra before it can process a second target after the first target has been processed. Another term would be Signal Processing Delay, or how long Spectra has to process the first target, and then be ready to process a second target. When I "explain" this time, I like to use the analogy that a target is processed in four steps .... (1) It is acquired (2) target data is calculated (3) target data is displayed (4) target is released and housekeeping done in preparation for the next target. Steps 1 - 4, added together = Recovery Delay.
Lower numbers = SHORTER delay. Higher numbers = LONGER delay.
Optimized Recovery Delay is a function of Sweep Speed, Ground Filter, Mineralization, Coil Size and to some degree, RXG and Disc Sensitivities.
The premise that the attached chart is founded upon is that (1) the coil can't see anything before or after it is over the target (discounting edge effect for purposes of this discussion) and (2) a full coil width's separation will minimize masking. You may find that you can actually reduce your delay times a bit from the settings in the table. They are given a 5% margin to address edge effect. I used the middle of the road 7.5Hz filter.
Faster RDs are best deployed in high trash areas. Slower RDs will provide more depth, up to the point that the coil is no longer over the target. Increasing / decreasing RD around the "recommended chart setting" will not add or subtract inches from your target depth, unless of course you adjust "too far" in one direction or the other. EG: A RD = 0 will make a quarter "chattery" at about 3", so that's "too short".
Coil size. Just want to touch on this .... A 4" coil (4X6"DD shooter) will pass over a quarter in less time then a 10" coil (10"DD) if both are moved at the same sweep speed. Thus, it has been my suggestion that if one is making a significant change in coil size, it may be worthwhile to adjust the Recovery Delay accordingly.
The chart is purely mathematical. I have sampled the data using all four coil sizes and varying sweep speeds and the performance matches the numbers. Please note that the sweep speeds are "Mississippi's", they are not timed with a laser and the coil wasn't moved by a highly consistent mechanical arm.
The quickest way to arrive at your "optimum" RD (IMHO) would be to place a two coins, one coil's width apart and swing the coil at your speed until you got two hits from the unit. If you know your sweep speed (and most people think they are sweeping slower then they really are) then the chart will "get you in the ballpark" and minimize your tweaking time. It will also provide a "sanity check" for your program settings as you develop them, or perhaps help you understand other people's program settings.
To estimate your sweep speed, lay off a line 4 feet long. Stand in the middle and sweep your coil from end to end, counting "Mississippi's". A 2 ft/sec sweep speed should take you 2 seconds to cover that 4 feet in one direction. I have seen many a surprised detectorist when they discovered that their sweep was closer to 4 ft/sec !!!
Hope this is helpful .... Da FoX .Таблицы по ссылке.В сообщение не помещаются.
К своему сожалению ошибся в своем мнении о сказочном герое. Герой умело затаились,сначала пытались себя преподнести в роли Пушкинской "белочки, которая в итоге сгрызла все запасы кедровых орешков царя, на этом не ограничилась, и решила подменить бобра - завалила кедровую рощу для поднятия уровня воды в своем личном болоте, ну и в 3 акте пьесы герой перевоплотился в персонаж новой сказки для взрослых мужиков "красная шапочка", а колобки в ней - мы, все на этой ветке. Правильно сказал "Асго" на ветке Whites ID этому герою - Вы ошиблись веткой.
Пожелание для всех, кто хочет реально знать что и откуда - не забывайте простую вещь: у написавшего любое сообщение в этой ветке есть ящик и зайдя туда , всегда можно получить ответ "из первых рук" и надо помнить: у санитаров леса такая работа - добивать подранков.