Bob,
That is normal - see page 38 of the KDSP2 manual, not to worry.
"Receiver noise heard when Clock or DSP menus displayed.
This is normal. The main microcontroller in the K2 polls the KDSP2 for
information to display about once
per second, waking up all option module processors, which generates
noise that is audible at some
frequencies. The K2 does not mute the audio under this circumstance,
because you may be listening to a
signal, or wish to synchronize the clock with WWV or some other time
standard broadcast. If you wish to
leave the clock display on for long periods of time, simply turn down
the receiver’s AF GAIN control or
use the squelch menu entry (SLCH in the K2 secondary menu"
73,
Don W3FPR
On 11/28/2010 5:38 PM, Bob wrote:
> My K2 seems to have a rather strange intermittent buzzing sound that occurs
> only when I press DISPLAY for the display to turn on/off the DSP noise
> reduction and notch filter. The buzzing sound goes on and off at an
> approximately 1 sec cycle. This occurs only when the NR and notch filter
> settings are displayed and it goes away when DISPLAY is pressed again to
> display the power supply voltage. It doesn't seem to occur under any other
> circumstances. It's more noticeable when there is no antenna attached and
> much more noticeable when in USB/LSB rather than CW (probably an affect to
> the wider bandwidth when in USB/LSB). Turning on the DSP noise reduction
> reduces the volume of the buzzing sound along with the background noise.
> Other than this intermittent buzzing sound, everything appears to be working
> normally. I don't know if this is a new thing or if it's been there all
> along and I never noticed it. So, what is this?
>
>
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