GSM手机ARFCN 5上不过,各位有没有遇到过呀

zlike_2004

GSM手机ARFCN 5上不过,各位有没有遇到过呀,其它频道上都很好,如何解决,我用的transceiver是si4210?

cylbailey

先說清楚什麽不過啊

zlike_2004

不好意思,是灵敏度不过,其它频道都还行,能达到-108dBm

maggiey

<P>建议看看70信道，如果也不好，很有可能是13M的干扰</P>

maggiey

是有线还是无线？

zlike_2004

70也不是太好,最勉强还能过测试,但5上就过不去了,各位有什么高超呀,

zlike_2004

有线测试

cylbailey

If your rxlevel is similar to other ARFCN while the BER remains relatively large, there must be certain inteference. So plz check your rxlevel first.
  Generally such phenomena indicates 13M harmonic inteference, adjust your AFC DAC and check if the ARFCN with the worst sensitivity changes, to verify the root.
  Aero series transceiver is nice although with problem in 13M clock isolation indeely.
  Try to add a small shielding to your TCXO, and move the 13M trace to inner layer with grounded copper to shiled it.
  If those above  can't work, try to attenuate the strength of the clock into the TC

coolgym

<P>你的晶振用的应该是13M或者26M，你可以算一下5信道的接受频率刚好是13M的倍频。70信道应该也有同样问题，它也是13M的倍频。这个解决起来......比较.....难。</P><P>呵呵，开玩笑，什么问题都有它的解决方法，就要多想多试。</P>