[TenTec] Carrier sliding across bands

[Mike Bryce]

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 at 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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