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Recent content by liberal

  1. L

    tactical common data link frequency

    why tcdl data link use ku band not c band?
  2. L

    Why the NF has worsened when mixer was added?

    I design a Receiver as below with MiNi's Product . >> >> filter---AMP----MCA1-24---MAR-6--filter--amp2-- >> >> nowthe receiver NF tested is 14dB. >> >> But the first filter and AMP 's Gain and NF tested is 14.8dB and 9dB >> >> the MAR-6\ filter and amp2's Gain and NF tested is 28dB and...
  3. L

    noise temperature for an amplifer - need help

    noise temperature for an attenuator at a physical temperature Tphys, the noise temperature is Te = (L − 1)Tphys.Then what about an amplifer ?
  4. L

    Why my PLL unlocks at low temperature?

    Re: PLL unlock yes,at -40,the Vtune is not enough.
  5. L

    Why my PLL unlocks at low temperature?

    Re: PLL unlock when under Mechanical Vibration,there are sidebands near the carrier,how do the vibrations convert to electronic signal as sidebands?
  6. L

    link path - calculating the power received problem

    link path when we calculate free space loss,we use formula FSL=32.4+20logf+20logd,any condition about this formula? now ,i have a system planning.transmiter antenna's height Ht,receiver antenne's height Hr ,transmiter EIRP is Pt+Gt,receiver Gain is Gr,distance is d,the frequency is f (about...
  7. L

    satellite communication - size and noise?

    satellite communication as we konw ,the effective noise temperature of the satellite earth station is 30K.Now i use a 6m Ku antenna and a receiver with 60K effective noise temperature and 44dB Gain,and i measure the receiver's output noise (i want to konw the noise i receive from the...
  8. L

    Receiver SNR question!!SOS

    receiver snr I have a receiver,whose signal flow is --LNA-----RF-----IF----AGC---- I measure the SNR at RF port ,it is 10dB,then the SNR at AGC output it is 5dB.why depreciated by 5dB,it should be equal,is't??? could the AGC depreciate the SNR??
  9. L

    noise figure - how to transfer to ambient temperature

    noise figure HI: I have some questions about noise figure,i need your help. we konw noise figure is defined for a noise source at a reference temperature of 290K,then is the reference temperature same to environment temperature or the real temperature of the system at work? and T=(F-1)To ,if...
  10. L

    Measure Eb/No with SA.

    How to measure Eb/No of QPSK with spectrum analyzer???
  11. L

    Power Amplifer questions

    i design a power amplifier with material Rogers 6010,it is good.But changed to AD1000,which has the same dielectric constant with Rogers 6010,the power is very little.why?
  12. L

    how to measure QPSK SNR with a spectrum analyzer?

    How to measure SNR ? how to measure QPSK SNR with a spectrum analyzer?
  13. L

    what is a FTZ filter in the RF front?

    what is FTZ filter? in the RF front ,after the antenna,there is a FTZ filter,what does FTZ mean? Thank you.
  14. L

    Problem with amplifier behind a SAW filter

    Re: SAW+AMPLIFIER signal from the saw has no 2nd harm..it is only from the amp.
  15. L

    Problem with amplifier behind a SAW filter

    Re: SAW+AMPLIFIER maybe 10db
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