[Elecraft] Phantom signals

[N4ZR]

Trouble is, my computer supplies N1MM+, including its spectrum display.  
Catch 22

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.

On 11/27/2018 6:16 PM, Don Wilhelm wrote:
> Another thing to suspect is noise generated by a computer, or ethernet 
> modems and routers and being routed to the K3 and P3 via the K3 to 
> computer connection.  I believe that is why Tom suggested winding the 
> USB cable through a type 31 ferrite core.  BTW, that core should be 
> near the computer end).
>
> Disconnect and power down the computer to see if that is contributing 
> to the "spurs".
>
> 73,
> Don W3FPR
>
> On 11/27/2018 5:57 PM, ab2tc wrote:
>> 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
>>>
>>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to n4zr at comcast.net