[Elecraft] Phantom signals

[ab2tc]

Hi,

Absolutely no sign of any of these spurs here with my K3S. Since they are at
constant frequencies they must be coming in through the K3 front end (*not*
at the IF level). So either your K3 front end is generating them (which it
shouldn't) or they are present in your environment. Again, since they are at
constant frequencies, the P3 or any other SDR connected to the K3 IF output
should not be the culprit. Send me an E-mail and I will give you spectral
plots collected with LP-PAN/NAP3 with K3 connected to a well shielded dummy
load.

AB2TC


tomb18 wrote
> 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@

> > Date: 2018-11-26  6:14 PM  (GMT-05:00) To: 

> elecraft at .qth

>  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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