[Elecraft] Phantom signals

[tomb18]

This is pretty common. One thing that can help is to wrap your USB cable through an ft241 31 to rid. About 6 turns gets rig of lots of picked up garbage. 73 Tom


Sent from my Samsung Galaxy smartphone.
-------- Original message --------From: Fred Jensen <k6dgw at foothill.net> Date: 2018-11-26  6:14 PM  (GMT-05:00) To: elecraft at mailman.qth.net Subject: Re: [Elecraft] Phantom signals 
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
> Check out the Reverse Beacon Network
> at <http://reversebeacon.net>, now
> spotting RTTY activity worldwide.
> For spots, please use your favorite
> "retail" DX cluster.

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