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front end desensed or overdriven

N3CHWN3CHW Member ✭✭
front end descended or over driven
by large adjacent signals when noise reduction is set at max


Declined · Last Updated

Comments

  • N3CHWN3CHW 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 -VA3WTBBill -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 - NM9PKen - NM9P Member ✭✭
    edited June 23
    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 N9IOClay 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.
  • N3CHWN3CHW Member ✭✭
    edited May 2018
    Thanks all, your comments helped clear this issue up for me!
  • Mark  K1LSBMark K1LSB Member
    edited May 2018
    To be concise, the 6300 has no front end hardware filters.
  • Clay N9IOClay 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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