In Knut's plot with the 1 kHz peak, the 2nd harmonic and 3rd harmonic
are clearly visible. In the one with the low end, I agree, no 60 Hz,
120 Hz or 180 Hz is seen. I measured my K3S with the radio connected
to the computer via the USB port. No 60 Hz, 120 Hz or 180 Hz signal
observed.
I suspect if anyone is experiencing "hum" they best look for a ground
loop which likely exists as there is a difference in potential between
different pieces of equipment.
73
Bob, K4TAX
On 12/31/2015 1:15 PM, ab2tc wrote:
Hi again,
BTW, some people have been complaining about 60Hz hum in the audio. I zoomed
in one the low end:
http://ab2tc.com/k3s_usb_lows.png
There is absolutely no sign of 60, 120 or 180Hz in this spectrum. I have
also listened to the signal with good headphones and hear no trace of hum.
AB2TC - Knut
ab2tc wrote
>Hi,
>
>Here is the spectrum out of the USB codec with a -73dBm carrier from the
>XG3:
>
>http://ab2tc.com/new_k3s_usb.png
>
>The K3S setting is USB with a passband of 300 to 2400Hz. I left the LINE
>OUT level set to the factory setting (10), and set the recording level
>with the Windows mixer (Win7).
>
>AB2TC - Knut
><snip>
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