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Offline AK48
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« Reply #800 on: May 09, 2018, 07:23:54 am »
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hello!  thank you for the explanation .

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« Reply #801 on: May 11, 2018, 12:54:35 pm »
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Hello everybody. As I said while presenting myselft, I am french and I made a Delta Pulse thanks to all
informations shared by a few specialized members. I would like to ask a few questions and participate
with my experience about this PI detector. I am prospecting near huge power lines with a big frame
and I am forced to reduce very much the power of the detector to avoid shattering.
I understand calibrating frequency of the detector on the power lines fequency (50HZ in France) help reducing
this shattering. Is it true or should I avoid a multiple frequency (100hz 150hz etc...)?


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« Reply #802 on: May 11, 2018, 02:35:37 pm »
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Yes it would be better to keep your pulse rate away from the 50Hz and or Harmonics of the same.  100, 150 or 200Hz  ...

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« Reply #803 on: May 11, 2018, 02:52:11 pm »
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you must tune pulse rate on even number ie 50x2 50x4 etc.  so DP has sure 100hz for your country with 50Hz and 120Hz for USA.

120 is 60 x 2

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« Last Edit: May 11, 2018, 02:53:46 pm by NE555 »
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« Reply #804 on: May 11, 2018, 03:31:27 pm »
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So I dont understand.. I keep away from 50hz and harmonics (100hz 150hz ...) or I tune on 50 hz and harmonics? 
I can see famous pulse induction detectors with ajustable  frequency in order to tune when near power  lines. Whites tdi and lorenz lpx2 for example. And other ones who seems to be fixe tuned on 50 or 60 hz (and hormonics). Thank you. Detecting

Posted on: May 11, 2018, 03:21:36 pm
And for those who dont have a  frequency-meter I Will give you a cheap way to tune on the frequency. Meaby you know this way but I didnt see it on the net. :Smiley

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« Reply #805 on: May 11, 2018, 03:43:14 pm »
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WHERE I WROTE HARMONICS? i wrote about EVEN NUMBERS AND ODD NUMBERS.
EVEN NUMBERS ARE - 2 4 6 8 10 12 14 16 18 20 etc
ODD NUMBERS ARE - 1 3 5 7 9 11 13 etc

you take 100 HZ AND MULTIPLY IT ON EVEN NUMBER.

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« Reply #806 on: May 11, 2018, 05:08:51 pm »
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   If your Pulse Rate is operating at the line freq 50Hz for you guys or a Harmonic there of you could possibly experience interference from the Power Lines. 

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« Reply #807 on: May 11, 2018, 08:05:45 pm »
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Hi homefire and others that may be able to help. The partslist/component numbering I seek may be labelled under Delta_PI, delta-treiti, or as already suggested Sniffer DeltaPulse. It is similar to the Marauder2.
If anyone finds the relevant partslist (with R3 as damper) for this double sided THunting board PLEASE POST HERE Huh?

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« Reply #808 on: May 12, 2018, 12:22:11 am »
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Hello.
I am sorry NE555, I didn't understand your first message but now it's clear, thank you.
I understand quickly but you have to explain for a long time.  Cheesy



Posted on: May 11, 2018, 11:44:38 pm
To adjust the frequency without frequency-meter, I use a small speaker plugged between -12V and irf740 radiator.
Then, thanks to the  sound of frequency in the speaker, I can measure it with a smartphone and an audio frequency counter application.
I plug the headset to the smarphone and put the microphone of the headset (on genuine smarthone headsets) on the speaker.
It's a very cheap way to measure frequency and it's incredibly accurate. You can test it with a given audio frequency on youtube for example,
you will be amazed. As it's not my language, do you understand?

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« Reply #809 on: May 12, 2018, 04:50:37 am »
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Quote:Posted by Super Pierrot
Hello.
I am sorry NE555, I didn't understand your first message but now it's clear, thank you.
I understand quickly but you have to explain for a long time.  Cheesy



Posted on: May 11, 2018, 11:44:38 pm
To adjust the frequency without frequency-meter, I use a small speaker plugged between -12V and irf740 radiator.
Then, thanks to the  sound of frequency in the speaker, I can measure it with a smartphone and an audio frequency counter application.
I plug the headset to the smarphone and put the microphone of the headset (on genuine smarthone headsets) on the speaker.
It's a very cheap way to measure frequency and it's incredibly accurate. You can test it with a given audio frequency on youtube for example,
you will be amazed. As it's not my language, do you understand?


my name is not Eric Foster to explain for a long time.

---------------interference----
Hi John,
Here is a copy of a post I made a couple of years ago which deals with this subject.
RELEVANCE OF PULSE FREQUENCY in a P.I. DETECTOR.
A question that is often asked about P.I. detectors is the relevance of the pulse frequency. Some detectors run at a hundred or so pulses per second while others run at several thousand. The first archaeological detectors I worked on ran at 22 p.p.s. In later versions we upped it to 43, then 170. The important thing was to avoid the same frequency as power lines, 50Hz in the UK, 60Hz in the US. Multiples of the power frequencies also had to be avoided e.g. 100 or 120. Severe beat note interference would result if the detector and power frequencies coincided; that is if you were anywhere near power lines as is often the case in the UK.
P.I. detectors running at low frequencies usually pulsed high currents through the coil, 5 - 10 amps being a typical figure. The on / off time ratio of the pulses was high so the average current drawn from the battery would be 100 - 200 milliamps.
Many of todays detectors favour much higher pulse frequencies. This puts the detector well away from power line interference but low frequency radio transmitters can then start to cause problems. Faster pulse rates also have the advantage in that the response of the detector can be made more rapid, which aids in pinpointing an object. Fast pulse rates require that the pulse current be less, otherwise things would start to run hot and the battery life would be rated in minutes. The pulse current can be restricted by a lower transmitter voltage but more usually by a resistor in series with the coil or by making the coil more resistive by using finer wire. 0.1 - 1 amp pulse currents being typical. One major factor in determining pulse current is acceptable battery life. With rechargeables 5 - 10 hours is OK, while standard alkaline cells would be expected to give 15 - 25 hours for the cost to be acceptable. One or two recent detectors on the market appear to have energy recovery circuits which make the transmitter more efficient and significantly increase battery life.
The pulse frequency has little effect on detector performance; one running at 170 p.p.s. could have the same range as one running at 5000 p.p.s. but there are many inter-related factors that determine the final performance, not least the design of the receiver circuit.
Hope this helps. I favour higher pulse rates (1500 - 5000) in my current designs.
Eric.


Posted on: May 12, 2018, 04:44:13 am
Quote:Posted by NE555
you take 100 HZ AND MULTIPLY IT ON EVEN NUMBER.


my mistake. you take 50 HZ AND MULTIPLY IT ON EVEN NUMBER.

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