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#503
07-02-2020, 05:22 PM
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Good day
here is the measurement of double 45 Turn coil of receiver in alonso-andreas PD. please notice that the value is approx but within the range you must position this coil on omega TX coil and nullify the received signal using oscilloscope. however, it's function is disputable. is it necessary? does it have a role in remote detection? or it is just for IB detection part? can i omit it? ( seems possible) anyway, here is the approx value.  
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#507
07-05-2020, 12:37 PM
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you did nice work . Alnso PD in hi sensitivity is unstable .
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#508
07-10-2020, 11:47 AM
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Thank you for admiration. Thank you About instability in Alonso-andreas PD, I disagree with you. In my experience, it is stable. As picture below, I made transmitter and ferrite rod receiver in blocks and separately. Despite andreas that said transmitter is powerful, I say no.it is not powerful also it seems Does not have influence on task or to say it does not have role in target detection. Anyway, it is discussable.  
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#509
07-10-2020, 12:23 PM
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good day
here are a few pictures that shows 3.5 cm receiver coil it works just in IB detection section and i think it can be omitted. also its receiver part can be ignored. i think,not necessary to have weak normal metal detector here. obviously,for many, it is very easy to make this coil but perhaps for a few is unclear from schema. just took pictures to illustrate it. hope to be useful. important: please notice that for adjusting this coil (receiver) on omega coil (transmitter), you need oscilloscope.                  
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#510
07-11-2020, 09:35 PM
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I disagree with you. In my experience, it is stable. What I said you was my experiment some years ago . From what distance your PD can detect small coin ??
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#511
07-17-2020, 08:23 AM
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as you know, alonso-andreas PD with such small coil and using low power, obviously is a weak IB metal detector if using as a normal metal detector. i don't have standard, international coin such as euro coin or US cents therefore i used a one-gram 21 C gold coin with diameter of 1 cm also a 9 volt standard battery. both as indicator to be at least international mentioned gold coin from 2 cm at max sensitivity and 9 volt battery from 5 cm to 6 cm are detectable by alonso-andreas PD as a normal IB metal detector here are a few pictures  
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#512
07-17-2020, 08:53 AM
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Good day
i measured alonso-andreas PD current consumption for each part individually despite Mr.andreas said that alonso PD has powerful transmitter, i disagree with him it is a weak transmitter. and in my opinion, transmitter has a quite a low influence in remote sensing. would like to say, it does almost nothing. i mentioned before that another factor is playing main role and perhaps it is UHF signals transmitting by some stations at Greece also at some other countries it is clear in the picture that the transmitter uses just approx 3 mAh you can imagine what is the power of 180 Khz relaxation oscillator that uses 18 volts, 3 mAh. also it produces damped-wave, each pulse has 125 micro second length so the alonso transmitter is weak and not powerful here are a few pictures.hope to be useful     
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#513
08-05-2020, 01:04 PM
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Hi behnamvp , I see that when is in noulling position some Alonso PD locating Fresh IRON : Ядосан: (for example Your 9V Battery) from small distance , but so not find buried IRON , İf we use Filter with signature of metal or electronic filter , so may be will reject Fresh IRON finding ??
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#515
08-09-2020, 11:33 AM
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Dear Morgan , When situation is So this is very Good info for PD that locating only buried precious Metals (Silver, Gold, Copper, Aluminyum and etc ...) and reject Ferrous metals (iron , nickel and etc... ) , Thanks for your Test infos . Morgan I make Test with my PD , that it also Can locate Fresh 3 - 5 gram Silver and Gold alloys from 1 to 2 meter distance (when PD adust is in very critical position) I'm in shocked . Also with modification not locating Fresh IRON .
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#516
08-12-2020, 10:03 AM
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behnamvp
Turn the omega upside down or 180 deg. Tune Tx 120 KHz. Passive receiver must catch spark from 1.5v battery at 2-2.5 m. Find correctposition,which is very hard. You need umetric slide mechanism for moving ferrite only 1 axis to catch exactly 1 point with respect to omega.
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#517
08-12-2020, 10:18 AM
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Dubulumach when omega tx on then PCB5 cannot catch 1,5 v battry from 2.5 meter . if you relay built it please upload movie .
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#518
08-12-2020, 06:23 PM
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First it's not nice answering on mails which aren't addressed you! Second I don't owe you anything and I doesn't need make proof for anybody! and Third I have said: Passive receiver must catch spark from 1.5 battery ant minimum 2-2.5m. This is possible only when it's properly tuned in respect to omega coil. I don't build lrl for selling, not selling and speading technology and secrets and don't uploading videos for anybody. I think i was clear!
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#519
08-12-2020, 09:52 PM
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First it's not nice answering on mails which aren't addressed you! Go and see my profile . you can see my email address clearly Again here my email : aft72005.1@gmail.com Second I don't owe you anything and I doesn't need make proof for anybody! and I built Alnso clone some years ago and try more with it . when omega tx on pcb5 can detect 1,5 volt short circuit from 60 cm . also I try micrometric mechanical system . there isn?t magic point !!!!!!!!! . Then you said you can try it from 2.5 meter !!!!!!! . also you said no movie no proof !!!!! Also there isn?t radio active ferrite road I asked you and you didn?t reply . I don't build lrl for selling, not selling and speading technology and secrets and don't uploading videos for anybody. I think i was clear![/QUOTE] Also I am not PD seller . I research several years about some PD .there are here many fake data . clear is when speaking then must proof what was said .
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#521
08-12-2020, 11:55 PM
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also with max critical adj , Locating FRESH Gold or Silver from 1.50 meter . Regards
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#522
08-13-2020, 09:22 PM
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please upload movie show that test . when omega tx /rx and PCB5 is on and work active mode .
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#523
08-14-2020, 12:48 AM
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but When I have time , I will make Video with 1.5V Bat. Spark for You . Regards .
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#524
08-15-2020, 12:01 PM
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Well, many years ago, I had some experiment in making omega-coil First made one for magnum metal detector ( andy flind) Then by modification, used it for chrome-2 metal detector Again by modification, used it for quasar-arm metal detector Anyway. Technically I do not see difference between straight or upside-down placement Of omega-coil. Technically there is no reason to turn coil 180 degree or move the ferrite above the coil In my opinion, no difference in function. At least I cannot find technical reason About your advice to tune ferrite to 120 kHz and spark test, I disagree with you I googled and found out that frequency of signal which produced by spark depends to wire and connection length of spark-making circuit. I mean antenna. So, your 1.5-volt battery spark will produce frequency that obviously is different than others But according to Wikipedia, by estimation, almost 1.5-volt battery test may produce frequency Between 50 kHz to 150 kHz. Depends on a few factors. As I measured ferrite coil value regarding to capacitor shown on schema, it can receive 70 to 80 kHz All can tune ferrite to receive 1.5 volt-spark. Not hard. Just by changing capacitor and moving coil on rod But there must be a source or good reason to consider a specific frequency and I could not find I suspect to beat frequency. When passive-receiver has low-band pass filter which does not allow Frequency above 15 Hz (practically 18 to 20 Hz) to pass and when you and mr.andreas say mechanical Micro-movement adjustment, then I suspect to beat frequency. It should be something between 50 to 200 kHz. I must study more. 
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#525
08-15-2020, 03:52 PM
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120KHz is correct freq.for Alonso PD. If you havent seen it doesnt matter its no exist difference. There exist a big difference in near field configuration. In addition of magnetic component of Tx from the ferrite passive receiver there are involved complex configuration of superpimposed Mag. and Elec. fields. Dont look at Wiki as releable source of info. Its MSM controlled internet media. They write what they want. Spark gap transmitter is a Tesla discovery. Its HV device where many factors were involved in one short time frame. 1.5V battery is low power, low voltage sourc of extremelly weak mag.field. Its preliminary test for your build. Real test need to be done at your personal test poligon on a real targets. We have deal with EPR of gold, silver and other metalls. No move ferrite above the coil but center it at bottom line of turned for 180 deg. omega. Correct distance between omega and ferrite should be found experimentally. For playing with pulses and lenght of wire as function of waveguide only reliable method is TDR or time domain reflectometry. You need very quality DSO and low capacitance probes aslo HV type for playing with this kind of circuit. Regards Dubulumach
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Linear Mode
