[Elecraft] K3 PREAMP2

[Don Wilhelm]

Brian,

Since the IF takeoff point in the K3 is before any filtering or 
processing, I would expect the band noise floor to rise with the preamp(s).

If you are referring to the receiver noise level with the antenna 
disconnected, then you have a valid point and I have no suggestions to 
offer.

73,
Don W3FPR

On 6/22/2017 5:46 PM, brian wrote:
> I use an SDR based panadapter (ROCKY) on the subrx.
> 
> I've noticed the following on all bands 15-6 when switching in preamps.
> 
> Noise floor no preamp = x
> Noise floor with preamp 1 = x to x+1 dB
> Noise floor with preamp 2 = X+10 to X+15 dB.
> 
> Would have expected the noise floor with preamp 2 to be about x.
> 
> What's going on?
> 
> 73 de Brian/K3KO
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