Sounds like an SMPS, it may be yours :-) I have a similar noise on 80
only. It sounds like a slight increase in the background noise as I
tune across it, but it is much more pronounced on the P3, and it drifts
slowly up and down by 20-30 KHz over time. It rises to a 2-3 KHz wide
peak, drops to near zero, rises to a lesser peak about 15 KHz higher,
drops again, and continues like that until the amplitude is near zero.
The WF shows a series of vertical, noisy, lines.
I think it's mine because when I get into a CW ragchew on 80 and have a
higher key-down average, the drift becomes more pronounced, like
something is heating up. I haven't been motivated to find it because,
while it's very pronounced on the P3, at CW bandwidths like 250 Hz, I
really don't hear it.
Weigh your wall warts. If they're not heavy, they're very likely SMPS.
The one I charge my shaver with puts out a "yuuge" amount of noise.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
- www.cqp.org
On 7/23/2016 8:42 AM, Terry Brown wrote:
I am operating portable in the southern Puget Sound area currently. I
am picking up a strange S9 interference that is very narrow but
generally slowly moving down the bands and sometimes up the bands. It
occurs at any one point in time at 14.030, 14.060, 14.090 for
instance, and occurs on all ham bands with the same spacing between
the instances of interference. I started noticing this same pattern
of interference at my home QRH in Oregon last week. I am running a
KX3, KXPA100, and sometimes the PX3. It occurs with preamp on or off
and with PA Mode on or off. I am wondering if it is atmospheric
natural or man made interference or if something is wrong with my
receiver in the KX3.
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