northwest Gain and mode what are they on the QED?
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australian electronic gold prospecting forum.com  |  Common interest forum.  |  General chat and discussion forum (Moderator: bugwhiskers)  |  Topic: Gain and mode what are they on the QED? 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Gain and mode what are they on the QED?  (Read 389 times)
Doug
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« on: Saturday September 22 2018 10:38:07 AEST AM »

Gain and mode what are they on the QED and are they related?
Mode is the sample delay time in the GB.At mode1  the sample delay is about 7 usecs and at mode 15  is about 15 u secs.ie after the pulses are terminated the receive QED circuit waits for 15 usecs before sampling.
The hotter the ground the higher the mode should be used until the  QED  can  be run relatively quiet  over the ground.
Gain refers  to the receive  signal amplification. At Gain 1 is the lowest signal amplification and higher numbers refer to higher receive signal gains.Higher amplification or gain will increase the total QED receive signal including ground noise, target noise and  environmental EMI. Lower gains  may give the best signal/noise result.
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« Reply #1 on: Saturday September 22 2018 10:56:13 AEST AM »

  
Gain and mode what are they on the QED and are they related?
Mode is the sample delay time in the GB.At mode1  the sample delay is about 7 usecs and at mode 15  is about 15 u secs.ie after the pulses are terminated the receive QED circuit waits for 15 usecs before sampling.
The hotter the ground the higher the mode should be used until the  QED  can  be run relatively quiet  over the ground.
Gain refers  to the receive  signal amplification. At Gain 1 is the lowest signal amplification and higher numbers refer to higher receive signal gains.Higher amplification or gain will increase the total QED receive signal including ground noise, target noise and  environmental EMI. Lower gains  may give the best signal/noise result.
doug smile

from the QED manual

GAIN
(Setting range is 1-10 and factory pre-set is 1)
GAIN amplifies target response, ground & mineral noises and EMI.
GAIN only marginally improves detection depth. For better depth penetration use a larger search coil.
Set GAIN as high as possible. If ground becomes noisy or impossible to detect or recognize a target in audio, check ground balance or reduce GAIN until stable .
Note: Ensure that GAIN is re-checked often, usually after a Ground Balance as mineralised ground may allow a higher GAIN setting depending on the prevailing ground conditions
MODE
( Setting range is 1-15 )
The MODE function matches the search coil to the detector’s receive circuitry. If the mode is increased the sample delay time is also increased which decreases detection distance on tiny targets but also improves ground handling ability. Some search coils may need a higher or lower mode number to run better in certain grounds, with good target response.
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bugwhiskers
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« Reply #2 on: Saturday September 22 2018 12:57:49 AEST PM »

Some users have reported that an alternative is to have the GAIN on minimum and raising #3 THS-A to provide quiet operation and good detection distance.
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mylab
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« Reply #3 on: Saturday September 29 2018 13:54:41 AEST PM »

This post #752 displays an interesting diagram in regards to THS-A & B settings for the QED.

  

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bugwhiskers
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« Reply #4 on: Saturday September 29 2018 16:45:37 AEST PM »

That's a diagram from the manuals. Swinging over a 5 cent piece and a $2 coin placed a couple of feet apart and adjusting #2 & #3 is the best way to learn what they do.

hair trigger

NOUN
a trigger of a firearm set for release at the slightest pressure.
denoting something that is quickly and easily activated or provoked.
"his hair-trigger temperament"
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« Reply #5 on: Saturday September 29 2018 19:32:27 AEST PM »

  
That's a diagram from the manuals.

Thanks BW although I had a look through the QED PL2 manual displayed on this QED Metal Detector web site:    however unable to see a diagram or that particular diagram in there?
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bugwhiskers
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« Reply #6 on: Sunday September 30 2018 06:43:39 AEST AM »

It dates back to 15/6/2017 and was in the early manual but somehow omitted in later revisions.


* BIAS_VOLUME.BMP (17.5 KB, 502x279 - viewed 98 times.)
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bugwhiskers
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« Reply #7 on: Sunday September 30 2018 13:05:24 AEST PM »

Notice that the rising pitch and falling pitch have now been swapped over.
The names of the functions have also been brought up to date.



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geof_junk
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« Reply #8 on: Tuesday October 2 2018 08:54:10 AEST AM »

BW I noted that you use a 5 cent and a 2 dollar coin. I understand that they have a large conductivity difference for the test , were they selected because they are about the same SIZE and are easily found as a consistent reference.   
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bugwhiskers
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« Reply #9 on: Tuesday October 2 2018 10:51:24 AEST AM »

  
BW I noted that you use a 5 cent and a 2 dollar coin. I understand that they have a large conductivity difference for the test , were they selected because they are about the same SIZE and are easily found as a consistent reference.  

First and foremost they generate the opposite pitches and the detection distance is similar. This allows users to see what effect MODE, THS-A and THS-B and GAIN provide.
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