Noise hunting
#1
I'm finding I'm getting exactly 100 triggers per second on the H field antenna and I think it's down to house wiring as turning it so that it's 45 degrees off parallel with the x and y axis of my house reduces the noise. The auto amplitude filter is effective and cancelling out +/-47 and +/- 141mV

Antenna is a coaxial möbius with a 50 turn transformer. Settings below. Any thoughts?
  • ModeAutomaticNoise AdaptionAmplitude Filter
  • SignalsReceived: 396404, Good: 14969, Sent: 13692
  • Signal RateLast second: 100, Last 60s: 99.6
  • ErrorsNo GPS: 0, Overflow: 0
  • StatusNormal
  • Server , Region 1
    10.6MByte, 3% Compr., 13692 Packets, 812Bytes each

Amplifiers
[Image: new.png]
Amplifier 1 - H0[Image: edit.png]
  • Channel A
    • Trigger-37mV/91mV, reached 20 times in last 15m, 54s

    • Gains10 * 10 * 40 = Total Gain 4000 | Relative Gain 6349 (99%)

    • Noise47mVpp

    • Lowpass Filter30.5kHz

    • Auto Ampl.Filter amplitudes around 47mV

Amplifier 2 - E0[Image: edit.png]
  • Channel A
    • Trigger-44mV/82mV, reached 95291 times in last 15m, 54s

    • Gains10 * 10 * 40 = Total Gain 4000 | Relative Gain 6349 (99%)

    • Noise35mVpp

    • Lowpass Filter30.5kHz

    • Auto Ampl.Filter amplitudes around -141, -47, 141mV

ADC
[Image: new.png][Image: edit.png]
  • Sampling per InputResolution: 12bits, Period: 666ns = 500.0kSPS, Time: 2000ns
  • ADC1
    • Input1Amp-Channel 3 , Offset 27mV, no Trigger

    • Input2Amp-Channel 4 , Offset 19mV, Trigger -63mV/63mV
  • ADC2
    • Input1Amp-Channel 2 , Offset 24mV, Trigger 0mV/0mV

    • Input2Amp-Channel 3 , Offset 27mV, no Trigger
  • ADC3
    • Input1Amp-Channel 1 , Offset 27mV, Trigger -64mV/64mV

    • Input2Amp-Channel 2 , Offset -169mV, no Trigger

Reply
#2
In many countries, 100hz is the power line zero cross (50hz) frequency. Maybecomputer / tv / whatever power supply

Power line itself shouldn't show up as 50/60 hz doesn't make it into the amp.

Start shutting stuff off until it goes away.

Also, please strip the server IP out of your post.
Stations: 1156
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#3
Oh. And mine looks bad today. Lawnmower got the cable to the antenna. Might actually look similar to yours, but at 60hz
Stations: 1156
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#4
Try manual mode and adjust gains.

I use manual mode with Amplitude Filter.
Kevin McCormick KB0UOI
Macomb, IL USA
Stations: 1539
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