#226
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help me to it work for me too
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#227
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Sorry but so long distance!!!
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Geo |
#228
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By email
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#229
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#230
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Where is our brave Greek ?
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#231
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#232
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#233
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AC coupling is not good at IR detection. We don't need modulation.
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Geo |
#234
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Geo |
#235
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#236
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Hi Dragan.
Really i don't know if a good magnetic detector is good at our days for T.H. I believe No... The big problem is the noise. The background noise is bigger than the signal of any buried object so no way (or very very dificult)to catch it. We must looking for something different. One way is to check the total noise!!!!!! Do u understand????? Regards
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Geo |
#237
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This special configuration with multiple feedbacks improve SNR while still maintaing high gain enough for catch the very tiny signals from the phenomenon.
Analyse it Geo. The first stage haven't negative feedback which is present in all emitter resistive load configurations. It was intentionaly changed for the dynamically load which keep change momentarely accroding to the input signals. Same worth for the collector load where is no constant resistive load but here load is dinamically changing. On this way we would get better power amplification and very low output impendance while after detection stage we get pure and clean LF signal without distorsions from the phenomena excitation. As you well know the main sources of noise in the circuist like it is primitive Alnso PD magnetic receiver which their authors had presented like the biggest engineering art all the time but in reallity is not worth building and spending precious time. So as i said the big resistive values are really unacceptable for any lrl frontend receiver. I am wondering how no one experienced electronic engineer doesn't see that or doesnt want to see the real facts which are really basic terms in electronics for the novices. In presented circuit the main amplification are coming fom the two special ferrite rods which were connected consistently. In fact every new attached rods in this configuration would improve SNR while maintaing highest possible gain without the self-oscillation of the circuit. Also this cicuit has AGC loop with automatically self biasing which is not the case in any commercial Mineoro LRL and also any lrl schematic at this forum. Also this circuit is insensitive to the low battery power which is not the case in Alonso's and any other receivers. People. I don't ask all of you to belive me but to understand me. Withouth understaning no one idea has worth. PS: As you know a lot of LRL secrets i think it wouldn't be a problem for you to enter the needed element's values and make sucessful experimens. Thats for now. Regards |
#238
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geo. The way to block out noise is through a very strong stimulant. I know I'm wrong.
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#239
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As i know no way to reduce the background noise.
Our effort is to bring out the signal of the buried object and not to block the noise. Anyway... at some terrens it's so so difficult
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Geo |
#240
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Quote:
As u know i have stop to try with magnetic field receivers. I play only with 2 types of lrl. 1. With radioactive antenna and 2. by measuring the total noise. Regards
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Geo |
#241
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Hi Geo
Yes Geo has a right. No way to reduce the background noise because its etheric noise due to etheric wind. But we can improve SNR ratio of the receiver circuit and catch the tiny signals from the phenomenon. 1. Use special ferrite rods for a wanted frequency range 2. Don't use high values resistive loads 3. Shrink the receiver's bandwidth to get it very narrow, improving Q factor and free signal from the wideband noise whick rise quadratically. 4. Use minimum number of componnets in the receiver's circuit because every new one bring own self noise to the circuit. Criogenically techniques we don't get into the account. Regards |
#242
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Hello, Dubulumach!
If the Q is increased, its square oscillation will also increase ..a very high Q and with precise tuning at a frequency (Ψ) will bring a gain above 5v~ ..but again this can be corrected..etc. . The point is that you have worked to find a proper ferrite two piece receiver and you have gathered the high Q value of the effect can you give us details about the double ferrite?winding etc. we have coils that catch part of the Φαινόμενο the signal but no a good two piece ferrite coil.. |
#243
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nice work.. as I know you using draw by splan .. you forgot chamber antenna
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#244
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#245
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Any lrl need Tx stage (stimulator) precisely tuned with the receiver to work.
Schametic i have gave is a dynamic frontend receiver much better than primitive schematic of Alonso PD or any other schematic at forum. Transistors you need low noise type and diodes are germanium type. Ferrite coils should be tuned for the desired freq.range. Experiments are the judges of theoris so if you need it you will try it. |
#246
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hello dubulumach
I wonder if there is a component list for message 229. If there is no special situation, I can also wait by e-mail. |
#247
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#248
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At first glance, the circuit is simple, but it is very capricious to set up. Even with high-quality parts, it may stop working due to changes in temperature or humidity. It?s interesting how the receiving path of the FG-90 behaves. If you have experience, please share your observations.
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#249
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I attach the picture of my fg 90 and IR reciver
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#250
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Hi dear Dubulumach
In my fg90 , to pin freq i have 864 HZ with 4.7 volt but this frequncy It passes from R7 resistance to osc pin . How many ohms is R7? 1M ohm???? In my IR transmiter we have 153 HZ with 7 volt , but my receiver IR is defective ، What type of IR receiver can i replace? My device is faulty. |
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