We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Author Topic: AM generator  (Read 7298 times)

Offline IRF510

  • Newbie
  • *
  • Posts: 6
    • View Profile
AM generator
« on: January 04, 2014, 1641 UTC »
Hello,

I'm looking for schematic of AM signal generator(with voice input).
I don't like x-tal - i want schematic on LC(capicator and coil in shield).
http://www.qsl.net/df3lp/projects/lftx/tx50.gif

73! irf510

Offline ff

  • Moderator
  • Sr. Member
  • *****
  • Posts: 443
  • Upstate NY
    • View Profile
Re: AM generator
« Reply #1 on: January 05, 2014, 0133 UTC »
Here's a link for a coil and cap exciter:

http://radio-circuits.blogspot.com/2011/02/marathon-low-power-transmitter-for-136.html

This circuit generates the carrier. Modulating the driver stage should be straightforward.
I hope you have plenty of space for an antenna!
Hailing from the upstate boondocks region of the progressive paradise which once was New York State

Offline bumbelstock

  • Jr. Member
  • **
  • Posts: 95
  • Div. 46
    • View Profile
Re: AM generator
« Reply #2 on: January 07, 2014, 1139 UTC »
Hello irf510!
..will post again in right topic ;)

I have built this MW TX for my home and i think this TX will work on LW with change the Coil 'L'.
Picture and schematics in Attach.
Greeting's and good DX!

 R1 = 1k
 R2 = 2,7 k
 R3 = 2,7 k
 R4 = 2,7 k
 C1 = 0,22 µF (Tantal)
 C2 = 100 pF
 C3 = 390 pF
 C4 = 390 pF
 T1 = JA 101 (any HF - Transistor (BF xxx), PNP, 30V and 0,2A  are perfect)
 L = ca. 80 - 100 Wdg. (for MW !)  ;D
Greetings from the Yellow Bumbelstock

RX from central Germany

Offline IRF510

  • Newbie
  • *
  • Posts: 6
    • View Profile
Re: AM generator
« Reply #3 on: January 21, 2014, 1839 UTC »
it don't works
on collector i have 4 V
on base 3.4 V

Edit:

IT works
« Last Edit: January 24, 2014, 1749 UTC by IRF510 »