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Recent content by oasis4355

  1. O

    What's the usage for the 10M Cable for Equipment

    10M Cable for Equipment Dear all, May i know what's the usage for the 10M Cable that needed to connect at the back of any equipment with any "external trigger"? Please advice. Cheers. Alex
  2. O

    Checking VSWR using VNA

    Hi, How do i check the VSWR of a cable using a VNA? Cheers, Alex
  3. O

    How to improve a FM receiver

    Hi, Is there anyway i can change the amount of the modulation? Is it changing the Q of the tank circuit? I've check with a spectrum analyzer, the transmitted FM bandwidth with my audio signal modulated with it, the bandwidth is around 100kHz.
  4. O

    How to improve a FM receiver

    Hi all, I've build a FM receiver to receive FM signal from my transmitter. Using a commercial radio i've been able to recieve my FM signal, with a certain amount of distortion. However, on my FM receiver, i was only able to hear the audio by placing my ear next to the speaker, and the...
  5. O

    How to get a FM modulated signal in ADS

    Hi all, I've found the FM modulation pallet, however, there are 3 pins for the pallet, RF in, RF out and MOD in. I understand that RF in will be my modulating signal, RF out will be the FM modulated signal. For MOD in, what should i put there? Thanks in advance
  6. O

    How to get a FM modulated signal in ADS

    Hi all, I'm trying to have a FM modulated signal from ADS. I've gone through the source for modulated signal, there are CDMA, GSM, pluse...but no FM... How should i proceed? Please advice. Thanks in advance Danny
  7. O

    How to find out the sensitivity of a receiver

    Hi all, I'm wondering how to find out the sensitivity of a FM receiver through simulation and measurement using equipments from lab. Thanks in advance. Danny
  8. O

    How to increase Q factor of LC tank

    inductance with magnetic core Thanks guys, it really helps. What i did was connect a resistor parallel to the inductor to decrease the resistance. My goal was to increase the Q so that the frequency deviation in oscillator will increase when i feed in different level of input voltage
  9. O

    How to increase Q factor of LC tank

    lc q factor Hi all, I'm wondering how to increase Q factor of an LC tank, If i change the reactance of the LC tank, won't be this affecting the frequency of interest? Thanks in advance
  10. O

    Question with FM Modulator

    Hi all, I'm using an oscillator to modulate my audio signal into FM signal. I've done some simulation using ADS to sweep the input voltage (audio signal) across the frequency. Here's some image to draw the picture more clearly. My audio works around 100mV, referring to the slope of voltage...
  11. O

    Problems with VHF amplifier

    Hi, Thanks for the info. But the circuit is working fine in simulation. Here's the image.
  12. O

    Problems with VHF amplifier

    Hi all, I came out with a class C vhf amplifier for the last stage of my transmitter, referring to the image that i've upload, it suppose to have a 20dBm gain at 100MHz in S-param simulation with ADS. However, when I've input a 100Mhz signal at -10dBm into the amplifier using a signal...
  13. O

    [Help] Looking for Pre-emphasis De-emphasis schematic

    pre-emphasis schematic Hi all, I'm looking for Pre-emphasis and De-emphasis circuit for FM transmission. Can someone recommend some? I'm trying to compare with my design, which looks pretty ugly. Thanks in advance.
  14. O

    [Help] Improvement on LNA design

    Hi, I'm using Advance Design System 2004A.
  15. O

    [Help] Improvement on LNA design

    Hi... Thanks for the info, it really helps. Actually i'm on holidays, just to do a couple of things to fill in the time.
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