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TOPIC: keep the Ref input clean

keep the Ref input clean 22 Aug 2018 22:49 #1

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I have a GPSDO that emits a very clean low phase noise 10MHz sine wave. Expected to be seen is one signal at only 10 MHz (although even that is unnecesary). Instead there are multiple harmonics adding noise to the entire pass band. The frequency is accurate, but comes with unwanted noise.

Why not keep Ref sine wave clean and as a sine wave versus squaring the waveform creating harmonics??? We no longer need to see reference harmonics that hams used to rely on decades ago. It is enough to know that the Ref input *sets* the radio's frequency.

Keep the pass band as clean as possible!!
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keep the Ref input clean 12 Sep 2018 15:27 #2

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The internal oscillator should also be shut off when an external reference is used. Maybe thru the menu in ESDR2 when the external is selected, the internal is shutoff??
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keep the Ref input clean 14 Jun 2019 22:30 #3

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This is just bump this again. Having a very clean band spread with minimal spikes generated internally. Less noise is best as there is plenty to be found outside.
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