Lowering the noise figure in a preamp

April 13th 06, 02:13 AM posted to rec.radio.amateur.homebrew

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Lowering the noise figure in a preamp

Thanks for the website, my problem was i had a factory cellular preamp
from surplus equipment, it had a ceramic filter on the input set
824-850 mhz. When i removed the filter the noise figure was terrible
but the bandwith very wide, im trying to get it to operate in the 33cm
band with decent noise figure. The only thing i can figure is that by
removing the banpass filter i raised the NF?

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