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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