An ionosonde, I think, would be a clean signal. I get switching power
supplies sweeping across the bands in my neighborhood, but they drift
very slowly and usually have a rough AC modulation on them. The buzz is
often found across the band at 20-30 kHz intervals. Noise blankers
won't wake them out. I hate 'em!
73,
Bob WB2VUF
On 10/24/2018 12:22 PM, MadScientist wrote:
Ionosonde sounds like the most plausible source. I read the description and it
looks very much like what I am hearing.
Thanks!
Gary
On Oct 24, 2018, at 11:16 AM, Mike Bryce <prosolar@sssnet.com> wrote:
that could well be nothing more than a switching power supply (think wall wart here)
and that’ s the oscillator singing away.
if you can, run the 7300 on a battery and pull the main breaker in the house.
If the carrier goes away, start looking
if it’s still there, as your neighbors about pulling wall warts one at a time
(good luck with that!)
Mike, WB8VGE
www.theheathkitshop.com
On Oct 24, 2018, at 12:07 PM, MadScientist <dukeshifi@comcast.net> wrote:
Well, I entered the SDR world with my new IC-7300! That’s off topic but what I
have observed with it is very much on topic.
Over the past year I have heard, on all rigs, a carrier sweeping across the
band (all bands). It is fairy strong.
The landscape ,on the 7300 is fast enough to observe the nature of this. The
signal consists of actually three peaks that typically start on the low end of
a given band and sweep the range of 200 KHz in about 2 seconds, with the speed
being nearly constant, as evidenced by the sloping line that the signal makes
on the waterfall display.
That line is almost perfectly monotonic across the entire scope window.
In addition, I sometimes see a carrier that makes a back-hand-forth movement on
the waterfall display.
Does anyone have any idea what be the origin of this signal??
I know it’s not a radio artifact as I have herd this on a dozen different
radios. Also, if I disconnect the antenna, this is never heard.
Gary
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