Internal spurs below 100kHz

  • 2
  • Problem
  • Updated 4 years ago
  • In Progress
I enjoy exploring the world below 200 kHz and my 6700 v1.0.0.99 works pretty good but only using the RXA or RXB inputs. When using the Ant1 or Ant 2 inputs internal spurious signals render most of the area below 100 kHz unusable except with preamp set at -10 db. When using the RX inputs the spectrum is relatively spur free with preamp settings at -10, 0, and 10 db. The 30 db preamp is unusable on any input in this frequency range, signals are 60 db down. Unfortunately with my antennas at these frequencies I need the low noise preamps engaged. I also noticed that the level calibration was very accurate when using the RX inputs on all preamp settings except 30 db however when using the Ant inputs, displayed levels from a calibrated signal generator were down 3 to 8 db depending on preamp selected. Here are screen captures of what I see with the different input and preamp settings. All inputs where terminated with 50 ohm loads at all times.
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Denley W3XY

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Posted 4 years ago

  • 2
Photo of Dudley - WA5QPZ

Dudley - WA5QPZ, Official Rep

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This maybe way more than what should be handled on the Communities.. If you don't mind, please enter this with the FlexRadio Help Desk, that way it can be logged and discussed with Engineering.. Tnx for the screen shots..
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Tim - W4TME, Customer Experience Manager

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We have confirmed this behavior on other radios so we are going to investigate further. Thanks for the report.

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