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#11
February 12th 06, 04:38 AM
posted to rec.radio.shortwave
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Lowe HF-225 whip preamplifier
Your point?
David wrote: On 11 Feb 2006 16:54:54 -0800, wrote: Note specifically I said input referred noise. If you don't put gain in the preamplifier (i.e. you do the so-called impedance only function), then the AGC of the radio will amplify the noise of the preamp. Since there is no gain in the preamp, you have the combination of the noise from the preamp and the amplifier (i.e. AGC) of the radio. If the preamp has some gain, then the AGC will do less amplification, thus the noise will be dominated by the preamp. IP3 |
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