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Odd Rx behavior

Rod KQ6F
Rod KQ6F Member ✭✭
edited January 2020 in FLEX-6000 Signature Series
I recently acquired a 6400 and have been comparing its performance with other SDRs on hand.  One thing I've noticed is how it behaves with atmospheric noise.  My noise level is fairly typical but I hear almost no difference between when I'm connected to my antenna vs dummy load.   On 75M it's about S5 in both cases.  With other SDRs there is a big difference between antenna and dummy load.  I attribute this to Flex AGC and how it works which seems to bring up internal noise with dummy load.  But that doesn't explain why I hear no difference when going to the antenna.  I'm not employing the NR feature but it's almost as if there is one built into the DSP chain that runs all the time.

Don't misunderstand - I'm not complaining.  In fact I love it.  I just don't fully understand what's going on.

Rod

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