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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