Jump to content
Electronics-Lab.com Community

sssaaa

Members
  • Posts

    74
  • Joined

  • Last visited

    Never

Everything posted by sssaaa

  1. this is the only(directional antenna) technique, or other military or other secret sevices use different techniques and equipments. i m asking you these things because in my country there is no good law for these things :( for example if some one make tansmitter for hobby, educational or leaning that how it works and transmit & if they (police or RF cops) catch him they dont listen or understand any argument they dont see who is he student or learner, they catch them and put in jail for many years :( :( there is no law for students:(
  2. And one more question with thanks. i use trimmer but they are little big. i want to use like urs. i have scrap of some clocks in which clock i will find them?
  3. from which technique the RF cops will get any transmitter? some one tell me that they use Radar ? is it Right? if any one "ON"(start)any illegal transmitter they will caught him in minutes or it takes time?
  4. I prefer used parts if you take it from somthing you have in your scrap which made by japan. japan parts quality is good as compare to others.
  5. I connected R8 to ground instead of to the positive supply but I didnot get good results, then I connected R8 to positive then the circuit gave good output. why the circuit hadnot given more output when i operate Q3 in class-C?
  6. hi audioguru your fm transmitter output power is 230mW or 360mW?(at 9volts) and on what minimum mAmp at 9V your transmitter work good.
  7. sssaaa

    fm

    means that the ossillator circuit not work fine alone. i measure its output power (first stage) it is very good on 12 volt. any idea to use it alone?
  8. sssaaa

    fm

    hi can any one know what is the out put of first stage(oscillator) of this circuit on 9, 12, & 16 vots, if i want to use it alone. not with rf amplifier stage. do i have to change L1 for this alone circuit or it will same. for 88-108 MHZ.
  9. hi audioguru i want to know that what will be the out put power of this circuit in mW when we do these changes. thanks..
  10. Hi AmRadiant read this... http://www.electronics-lab.com/forum/index.php?topic=3035.0
  11. plz give diagram how to oprate Q3 in class-C.
  12. hi audioguru i measure your transmitter with 1 metre distance between both antennas. field strength metre and your transmitter. and other one or two transistor fm transmitter circuit i have. but your circuit is generating more RF power as compare to them. and stability is good also. but i judge that during transmitting Q3 is producing very littile amount of heat is it right? i want to tune it around 80 MHZ, how many turns of coil do i make? as you know my trimmers are 1-27pf.
  13. but my question is y my metre shows 3-4 volts. in two transistor (by joint antenna ) and 5-6 volts in one transistor. when i was made 4W (two transistor 2219) transmitter when my metre shows 10-12 volts from 9volts duraplus battery. and 16-17 volts from 12 volt supply. in joint antennas of field strenght metre and transmitter. y?
  14. hi audio guru i built your circuit and it is working. i check it by field strength metre. I joint both circuits antenna together. (both circuits have 5cm antenna) your circuit shows 3 to 4 volts in digital volt metre. and previosly i built a one transistor fm transmitter which shows 5 to 6 volts. from same field strength metre to digital volt metre. two transistors have more out put power then y my metre shows 3 to 4 volts. ?
  15. thanks audioguru the RF stage of your transmitter (mod4) wants special tuning like 4W fm transmitter (two transistor 2219) or your`s circuit rf stage is tuned? i m using C7 = 5pf except 4.7 it will ok? thanks to windoze killa also.
  16. hi audioguru but the coils of both pictures are different which one i will make ? in first colour picture there are ten turn of coils in second picture it shows 9 turns on 5mm former and 1mm wire. what is the exact turns and former for coils. some another questions I found IC 2931A 5.0 and IC 2931T 5.0 in TO-220 package. It is ok ? i m using all capacitors ceremics except 100uf. it will OK? and i m using trimmers 1-27 pf.
  17. hi all how can i make coils of this circuit what diameter of wire, how much turns and what size of former on which i wound these coils. thanks in advance.
  18. yes SM2GXN i read it but i found on search many formulas like 468/frequency 147/frequency 142.5/frequency and you gave me 150/frequency which one is correct?
  19. hi i want to add a one transistor rf amplifier in this circuit. can any budy help me.
  20. i want to make two antennas one for 82MHZ and other for 86MHZ
  21. I want half wave dipole formula for FM band 76-108 MHZ.
  22. hi to all i want a dipole antenna formula for FM band.
  23. i want to know what type of antenna i will use? tell me any easy antenna.
  24. hi staigen! yet i m thinking to contect you and you are here. hai staigen you have your hotmail ID? on which you online?
×
  • Create New...