QST Review - NF Error?

  • 1
  • Question
  • Updated 2 years ago
Looking at the Noise Figures posted in the 6500 QST Product Review, I'm struck by the values 27/21/11 dB (preamp off/1/2). Surely that's incorrect. Anyone have a lead on the real values?
Photo of George Molnar, KF2T

George Molnar, KF2T, Elmer

  • 1590 Posts
  • 555 Reply Likes

Posted 2 years ago

  • 1
Photo of KF4HR

KF4HR

  • 545 Posts
  • 158 Reply Likes
I'm curious if the 6500's noise figures they quoted were different from QST's review of the 6700 in April 2015?
Photo of George Molnar, KF2T

George Molnar, KF2T, Elmer

  • 1590 Posts
  • 555 Reply Likes
29/23/12/7 for the 6700 in 2015's review. I suspect this measurement and what I was expecting are two different things. Time to go learn something...
Photo of N9VC

N9VC

  • 125 Posts
  • 34 Reply Likes
Noise figures at HF are not that critical. Go to the ARRL website
and you'll see similar numbers on any of the HF transceivers.
Atmospheric noise and what not usually override the noise floor
of the receiver.
Photo of George Molnar, KF2T

George Molnar, KF2T, Elmer

  • 1590 Posts
  • 555 Reply Likes
Quite true. My interest in this topic was regarding 50 MHz performance. I've seen some other rigs' reviews with lower published NF values, and wonder if the methodology or results are different for an SDR.
Photo of Bill W2PKY

Bill W2PKY

  • 28 Posts
  • 5 Reply Likes
On my 6500 used a Down East Micro 20db preamp on 6M to assure a low NF.
Photo of George Molnar, KF2T

George Molnar, KF2T, Elmer

  • 1590 Posts
  • 555 Reply Likes
I have an ARR preamp on the RXA loop for 6m. Definitely lower noise, as one would expect.