Connect with us

simple HF Signal

Discussion in 'General Electronics Discussion' started by newbee2014, Jul 9, 2014.

Scroll to continue with content
  1. newbee2014

    newbee2014

    6
    0
    Jul 9, 2014
    Hello all.
    I'm learning how HF signals work.
    I just want an emitter who sends a wave (30mhz)to a receiver.
    So I wanted to know if my schema is right.
    And how to make the receiver part please?.
    Thank you all.
     

    Attached Files:

    Last edited by a moderator: Jul 9, 2014
  2. davenn

    davenn Moderator

    13,647
    1,884
    Sep 5, 2009
    hi

    welcome to EP :)

    without knowing the model of the ceramic resonator, I cannot guarantee that that's the way it can be connected
    Do you have the part number for it ?

    cheers
    Dave
     
  3. newbee2014

    newbee2014

    6
    0
    Jul 9, 2014
    Dear Dave.
    Someone just told me it won't work with it.
    I just found out this,I will build it.
    Apparently it's a 90MHz transmitter.
    But I can't find any 90MHz receiver.
    Can you help me please.
    Thanks.
     

    Attached Files:

  4. davenn

    davenn Moderator

    13,647
    1,884
    Sep 5, 2009
    90MHz receiver ..... your FM band receiver they all go from 88 - 108MHz ;)

    if you haven't got ... go buy a $5 AM/FM radio
    a lot of mobile phones also have a FM band receiver

    Dave
     
    Last edited: Jul 9, 2014
  5. davenn

    davenn Moderator

    13,647
    1,884
    Sep 5, 2009
    just as a side thing for you to learn ....

    If you are going to start playing with electronics ... its important to get your designations correct
    note how I corrected your post :)

    MHz not mhz

    just one of many things for you to learn .... it saves confusion

    M for Mega ..... m for milli
    Hz for Hertz .... as it was named after Mr Hertz

    cheers
    Dave
     
  6. newbee2014

    newbee2014

    6
    0
    Jul 9, 2014
    Dear Dave.
    You are right!..interferences.I need less than 90.
    "The frequency is determined by the 6 turn coil. By moving the turns together, the frequency will decrease. The circuit transmits at 90Mhz. It has a very poor range and consumes 16mA".
    Now I need to build a receiver,maybe a 80 or 70Mhz.
    Thanks.
     
  7. davenn

    davenn Moderator

    13,647
    1,884
    Sep 5, 2009
    I don't think you understood

    If its supposed to work at around 90MHz, leave it there.
    you can tweek the coil a bit if there is a local FM radio station at around 90MHz

    did you not read this bit ?.....
    BUY a $5 AM/FM radio for your receiver

    cheers
    Dave
     
  8. newbee2014

    newbee2014

    6
    0
    Jul 9, 2014
    Dear Dave.
    I need to build it.
    Thanks.
    PS:90Mhz is the number 1 rap radio in France,I don't want to spoil it.
     
  9. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,411
    2,779
    Jan 21, 2010
    Don't worry, you'll probably improve it.
     
  10. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,270
    Nov 28, 2011
    90 MHz is just an approximate frequency. You can tune your receiver to somewhere where there's nothing transmitting, then tune your transmitter to match.

    Is your transmitter an FM transmitter? If it's AM, an FM radio won't receive it very well.
     
  11. davenn

    davenn Moderator

    13,647
    1,884
    Sep 5, 2009
    Its just an oscillator, Kris, it's unmodulated


    Dave
     
  12. newbee2014

    newbee2014

    6
    0
    Jul 9, 2014
    Dear friends.
    I built it,took my radio switched to 90Mhz.But nothing happened.
    I think I have an issue with the size/diameter of the coil.
    "then tune your transmitter to match."
    Where I do that? reducing the 6turn coil?how much I need?.
    Thanks.
     
  13. davenn

    davenn Moderator

    13,647
    1,884
    Sep 5, 2009
    it may not be exactly 90MHz you need to tune around on the radio carefully to find where the background hiss gets quieter
    (assuming that the oscillator is resonating somewhere in the 88-108MHz band)

    if you do find where the hiss gets quieter, then switch off the transmitter and see if the hiss comes back

    ( when I want to find what freq a transmitter if on, I use a frequency counter. Else it is VERY difficult to know what is happening)

    cheers
    Dave
     
  14. newbee2014

    newbee2014

    6
    0
    Jul 9, 2014
    Didn't work.
    I'm sure the issue is the coil.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-