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front end desensed or overdriven

W7CHW
W7CHW Member ✭✭
edited June 2020 in FLEX-6000 Signature Series
front end descended or over driven
by large adjacent signals when noise reduction is set at max


Comments

  • W7CHW
    W7CHW Member ✭✭
    edited August 2019
    additional infoadjacent signal can be more than 5kc away from slice receive signal and is usually 20db higher than noise floor. I noticed this problem on 20 and 40 meters on my Flex6300.I describe it as de-sensing because it diminishes the station that is being received. 
  • Bill -VA3WTB
    Bill -VA3WTB Member ✭✭✭
    edited May 2018
    The 6300 does not have as steep filters found on the 6500.
    Turning on noise filters can degrade close signals that are so strong.
  • Ken - NM9P
    Ken - NM9P Member ✭✭✭
    edited June 2020
    Just as with any other rig, turning the noise blanker or wide and noise blanker up too high in the presence of very strong signals will compromise the dynamic range of the rig. WNB can “pump” with strong signals, especially if they have sharp transitions (key clicks or overdrive). If you turn the control down a little, the pumping will stop. NB will distort. In the presence of the same signals, just like any other NB.
  • Clay N9IO
    Clay N9IO Member ✭✭✭
    edited August 2019
    N3CHW, I got my 6600 back from a repair and noticed the same on 40m, the pumping was crazy.. Digging I realized when I looked in the Maestro meno the WNB was all the way up. Knocked it down around 1/4 scale, issue gone. Have to admit it freaked me out for a second.
  • W7CHW
    W7CHW Member ✭✭
    edited May 2018
    Thanks all, your comments helped clear this issue up for me!
  • Mark K1LSB
    Mark K1LSB Member ✭✭
    edited May 2018
    To be concise, the 6300 has no front end hardware filters.
  • Clay N9IO
    Clay N9IO Member ✭✭✭
    edited May 2018
    Regardless the problem was with the WNB being set too high. But you're right on the 6300.

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