Improve reception CD2003 (TA2003 clone)

Discussion in 'Wireless & RF Design' started by Floyd2, May 10, 2013.

  1. Floyd2

    Thread Starter New Member

    May 9, 2013
    Hi all,

    I assembled a cheap Chinese AM/FM radio kit 208HAF based on the CD2003 chip, a TA2003 clone. All works as might be expected for the low price but on AM the sound is a bit course, like all is overmodulated. Is there an easy way to fix this? I would settle for less volume as it is loud enough.

    Another thing: when tuning to a station on the FM band there are always two stations heard at the same time. The FM receiver is also not very sensitive. That puzzles me, any ideas?

    The IF filter used are 10.7 MHz. First stage audio amp is a 9014C (HFE=100), followed by two 9013H.
    Additional info:

    Hope somebody can help me out. Thanks, Floyd
  2. mar4all

    New Member

    May 16, 2013
    hi Floyd2
    sorry that no answer yet as i want to do this circuit too ..
    now try to collect every thing about it ..
    wonder if you can write any important details about it with pictures maybe as the schematic is not clear ..
    and what did u use for var capacitor ?

    last thing . do u know any good source or Link for circuit schematics about FM /AM transmitting too ...
  3. LDC3

    Active Member

    Apr 27, 2013