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S meter noise goes down with ANT preamp increase

Rick - W5FCX
Rick - W5FCX Member ✭✭
edited June 2020 in FLEX-6000 Signature Series
I’m trying to understand why my 6700 S-meter noise readings go down from let’s say S3 with ANT preamp set to 0 dB and then reads S1 or S0 with ANT preamp set to 20 dB. I’m assuming it’s resulting in an improved signal to noise ratio for some reason but it’s counterintuitive.

Answers

  • Ken - NM9P
    Ken - NM9P Member ✭✭✭
    edited June 2020
  • Bill W2PKY
    Bill W2PKY Member ✭✭
    edited June 2020
    Believe Flex said if you observe 10 dbm of additional noise when attaching the antenna then no more pre-amplification is necessary. 
  • HCampbell WB4IVF
    HCampbell WB4IVF Member ✭✭
    edited June 2019
  • Ken - NM9P
    Ken - NM9P Member ✭✭✭
    edited October 2018
    I believe you are correct, I was just trying to simplify my answer.
  • HCampbell WB4IVF
    HCampbell WB4IVF Member ✭✭
    edited October 2018
  • Rick - W5FCX
    Rick - W5FCX Member ✭✭
    edited October 2018
    That matches what I see. Improved S/N on 20-10m on my 5 band spiderbam at 20dB preamp setting, which reduces noise floor and brings in weaker signals. Only negative side effect is very strong signals IMD interfere more. On 40m and lower bands, atmospheric and other noise from wire antennas dominates.
  • Craig Williams
    Craig Williams Member ✭✭
    edited October 2018
    I must use every button. Resistance is futile. 

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