Microwave Forum

richy_64 · Administrator Messages: 198

@immy, i would change your circuit like this.

What is the oscillators frequency? Change C1 to get 10-20kHz.
I think some nF will be suitable for this.

Use an oscilloscope to measure at the output. Now you can adjust the waveform you want...
For example: To get a signal from 17-23V, set the "DC Offset"-resistor to get 20V, then turn the "Noise Amplitude"-resistor to get 17-23V.
It will work!

richy_64 · Administrator Messages: 198

@imgemini

Are you able to take a picture of your noise generator´s output signal with an oscilloscope?
This would help much.

imgemini · Chef Clancy Wiggum Messages: 39

ok i will take the picture of my noise 0gen signal and wil try this circuit also

but i want to know why its not shopwing anything on ths ouput pin when i give

13.5v dv noise signal

Vcc =10
output= anthing

i hope i conned right wire bcoz it not

Coaxial Cable

richy_64 · Administrator Messages: 198

To get higher frequencies, try this:
R1=3,3k
R2=1k
C1=100nF

The LEDs can be left away.

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I ALSO RECOMMEND THE FOLLOWING:

@imgemini: please take a picture of this output signal, too. Thanks.

imgemini · Chef Clancy Wiggum Messages: 39

hi
here is the cricuit

imgemini · Chef Clancy Wiggum Messages: 39

imgemini · Chef Clancy Wiggum Messages: 39

here is the signal ....

anthing in khz just in hz i think 0.5hz only

i tune with POS1060 with that bout get anthing on output

imgemini · Chef Clancy Wiggum Messages: 39

here is the ouput singal odf POS1060

plesae both of you can tell me wwhat is wrong .....and what should i do now

kleiner-onkel · Administrator Messages: 412 Location: South-West-G

hello...

....maybee our ne555 circuit deliver to less output....!!!

(damn ne555!!!)

try messure with and without connect to the VCO...

so you can see how much ne555 able to drive ...!!!

send some picures with voltage per division
and time per division.

so i can read our circuit right.

Chris

p.s. better use my sawtooth circuit (8->) !!!

imgemini · Chef Clancy Wiggum Messages: 39

hi
plesae clear these trams for me

why i need 10 to 20kh?

if this is my result as show above then what should i do know to get 10 to 20 khz

plesae friends reply

richy_64 · Administrator Messages: 198

These pictures are not useable for anyone without descriptions like volt per division and time per division...

The 2nd picture: You have measured the POS1060 output??
What is your oscilloscope´s bandwith?

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The sweep frequency to modulate the vco has to be "high".
If the sweep frequency is too low the jammer won´t work, because the gsm error correction can handle short interferences.

To get a higher frequency, change R1,R2,C1.
I have mentioned it above already.

@ Chris
Everyone uses/knows the NE555.
I don´t like it, too.
I don´t know why