Lrl from Italy

[okantex]

Hello Mr Franco , Omar
Can you tell the condition of sensing sky effect.
What is sky effect .how do we test it
İn my circuit.
At home ,while elevating antenna. Signal goes to max(3leds). But outside of home..no increase .
At home i can not test north south effect.
But outside... At north..45right /45left degree..and same at south .. 1 LED blinks slightly..

[FrancoItaly]

Hello Mr Franco , Omar
Can you tell the condition of sensing sky effect.
What is sky effect .how do we test it
İn my circuit.
At home ,while elevating antenna. Signal goes to max(3leds). But outside of home..no increase .
At home i can not test north south effect.
But outside... At north..45right /45left degree..and same at south .. 1 LED blinks slightly..

The sky effect and compass effect are only noticeable outside and appear when there is too much amplification, inside there is too much electromagnetic disturbance.

[okantex]

Mr Franco
for the message 3125
you are saying in all formations(L1 C10 options) reception of antenna is in 80/120mhz
I would like to ask.. when you are outside.. and when you elevate antenna stick to sky 90 degree..does your first led or all starts giving lights..and buzzer beep?

at outside even adjusting all pots for max values.. ( I have 2 bobin version with12mhz lm3914 10 leds..) just see 3/4 leds..nothing changes while elevating antenna up..can not see sky effect.
with this setup..I have pointed few places with 6 to10 leds..
not all pots are not max.. in north direction..I am calibrating with first led and sink it..then I can searh in north south directiion...
even at my pointed targets with 6-10 leds on.. I can not get signal from east or west..
I feel that I am not recieving in FM range..if I were .... whereever I elevate antanna up. , I have to see radio waves..
without antenna input. my tr5 output.. or 358 input.. is around 5 volts

I would like to have comments of you , and Erfan and Omar
thanks for advices

I think we are traching by reclections of north south.......compass effect...magnetic lines of earth..,and for other all directions.. reflections of available RF propagations...mostly

I feel I am just receiving ghz of wifi at building..

one another poing.. I am using battery 12V instead of 2x9Vcells.
I am not using regulator...
when I am touching to battary signal is decreasing.. as you touch to antenna..

you have advised to use secondary cooper not etched..as screen. and do connection to GND from screen.. if I am wrong for give me... for aluminium boxes.. do connection to box from gnd.. also use aluminium Rod and connect to gnd..
I am testing it by touching to GND of battery.. it is same..I think..
results signal sinks..

[omar]

Hello,

I made two versions of the Franco device a long time ago, the 8 MHz version... one with a BC547 transistor that does not sense the sky, and the second with a BC173 transistor. It was good according to the required specifications and senses the sky...

and I remember that one of the problems I found in the real field was the need to reset the threshold frequently because Rapid sensitivity collapse. Also, the signal is not fixed at the same point at all times. The thing that I did not really know is that the signal depends on the surrounding conditions, place and time....

I advise strict adherence to Franco?s scheme as it is, without more or less. Three LEDs are sufficient to track and know the level of the signal. Using additional accessories that may cause confusion for the user....

For example,,,, I have done By adding a protection diode to Franco's circuit, and when I simulated the circuit, this diode caused sensitivity problems. Using regular batteries is better than lithium or acid charging batteries because of the voltage noise...

and also self-oscillation. I noticed it with several sensitive receiving circuits. Why it happens I do not know definitively, although you use the same parts on the breadboard once you succeed with no self-oscillation and the same parts return. Assembling it again, you find it suffers from self-oscillation. Using ceramic capacitors is better because of their faster signal interruption and small capacitance.

Stable operating voltage in such sensitive circuits (very, very important). The use of a voltage regulator is mandatory, to stabilize circuit operation and sensitivity.

[okantex]

When there was 7812 with 12v acid battery.
There Signal at display stage .even sens?r stage was Stable alone. İ deteched stages..but could not lose osilation. İ could let it work after detaching 7812..
Btw, i am also using protection diode at positive entrance..i frequently do wrong connection and burn circuit.
İs not protection a kime of regulator for supply line

Now i do not have osilation..and circuit is Stable.
But it detects me from battery.
But my observation is that..if we dongnd )shild/holder connections...webare decreasing signal.

[FrancoItaly]

Unfortunately, it's been several years since I did research and tests with my lrl and I don't remember all the details that are asked of me, very important is the voltage of the lrl power supply, the 7812 requires at least 15V to work correctly, I recommend 18V power supply and calibrate the control led to light up with 15.5V. Regarding the sky effect and the compass effect they are due to excessive amplification so the only remedy is to lower it. In my country, I can not vouch for the others, the greatest sensitivity is proceeding from north to south, the minimum from south to north and an intermediate value east/west and west/east. Regarding the stability of the sensor stage output I have never had problems. I invite other members who have built my lrl to express their opinion.

[okantex]

İ do agree with working conditions if 7812.
With acid battery ..it gives 10.5v
But even with 18v supply...will give 12v
How to calibrate LED with 15.5V?
Circuit will be working with 12v

Outside..at field..i can not see sky effect.
And at the pointer Target..even getting singal 15m north..6m south...i can not get Signal from West or east even over the Target.
Any comments

[FrancoItaly]

R1 in the power/display (1 led) stage is connected to +18V and together with R2 forms a voltage divider that halves the voltage of 18V.

[Kamal]

hello to everyone
does the effect of the sky interfere with the circuit

[Kamal]

my design

[Kamal]

hello , mr franco , i have a health wish for you .

is the effect of the sky . it 's okay no

[Kamal]

mr franco
shall we remove the predecessor ?

[FrancoItaly]

The coil is always the same.

[osman34]

Hello Mr. Franco. First of all, thank you very much. I need help with something? I tried to transfer your circuit. When voltage is applied, the yellow LED lights up and then goes out immediately. I can't see anything between the antenna and ground. I used BC183C LM358P 500k POT. Where exactly would the control points be?

[osman34]

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