[Elecraft] Phantom signals

[Fred Jensen]

I have a clean carrier at 7039.6, about S4, but nothing on 20.  It's 
pretty hard to build a double conversion superhet that doesn't have a 
few weak spurs.

73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 11/26/2018 2:20 PM, N4ZR wrote:
> I recently started using N1MM+'s spectrum display with my K3, and it 
> made me notice that I have some phantom signals on the display. 
> Specifically, there are steady carriers at 14039.6 and 28039.6. Each 
> of these carriers has "sidebands" spaced 1 KHZ apart on either side. 
> There is a slight AC roughness to the tones as heard in CW mode, 
> particularly on 20M.  On 7039.6 and 21039.6 a single carrier is 
> audible, much weaker than on 20 or 10 meters.
>
> Disconnecting the antenna from the K3 does not affect these signals, 
> nor does disconnecting my Airspy HF+ from the IF Out jack.
>
> Any idea what these might be?  Because they are discrete frequencies 
> and relatively weak, they aren't particularly an operational problem, but
>
> 73, Pete N4ZR
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