SAW Resonator 330MHz

Discussion in 'The Projects Forum' started by eason_kenix83, Aug 7, 2013.

  1. eason_kenix83

    Thread Starter New Member

    Aug 7, 2013
    1
    0
    Dear Friends,

    I have few questions need to ask. I am using SAW resonator, 330MHz, with PCB design antenna.

    Below is the schematic diagram:

    [​IMG]

    With the same circuit, I have tested with 315MHz and 330MHz.

    Below are components used for 315MHz:
    L1=22nH, C1=3pF, C2=15pF, R1=100R, RF bypass=100pF, R3=0R, R1=3K9, transistor=2SC4226.

    Then I used a RF receiver tester, the 7-segments display kept on showing the frequency within the range 314.5MHZ~315MHz, for non-stop.

    After that I switch the saw frequency to 330MHz, below are components value for 330MHz:
    L1=22nH, C1=2pF, C2=8.1pF, RF bypass=100pF, R3=0R, R1=3K9, transistor=2SC4226.

    When I used a RF receiver tester, the frequency did not shows 330MHz and display has no response when I kept on pressing transmit button.

    So my question is what are the component values for L1, C1 and C2 if I would like to transmit 330MHz signal?

    Thanks.
     
  2. panic mode

    Senior Member

    Oct 10, 2011
    1,319
    304
    did your signal at modulation input include DC component? you need something to bias transistor... try 2-3Vdc. what are Vcc and R2?
     
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