RFI
[Top] [All Lists]

Re: [RFI] 8 KHz spurs across much of amateur spectrum

To: N4ZR <n4zr@comcast.net>, RFI List <rfi@contesting.com>
Subject: Re: [RFI] 8 KHz spurs across much of amateur spectrum
From: Lee STRAHAN <k7tjr@msn.com>
Date: Tue, 13 Mar 2018 17:17:45 +0000
List-post: <mailto:rfi@contesting.com>
Pete,
    As I recall you may be a Hi-Z user. If you are hearing these spurs on a 
Hi-Z array you may want to check all the elements. If one gets shorted or 
partially shorted to ground we have had cases where an array will pick up spurs 
similar to this. On almost all of the later versions of the Hi-Z amps there is 
4 to 5 VDC present on the element. A simple test for grounding is to measure 
this DC on the elements. They should all match within 0.2 VDC of each other.
   If the noise is not on a Hi-Z array then look for a VFD running a pump or 
any other synchronous motor. They use switching frequencies this low.
   Good luck,
Lee    K7TJR   OR

-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of N4ZR
Sent: Tuesday, March 13, 2018 4:42 AM
To: RFI List <rfi@contesting.com>
Subject: [RFI] 8 KHz spurs across much of amateur spectrum

This may be a fool's errand, but just in case - I have discovered relatively 
pure carriers every 8 KHz 2-28 MHz (not heard on 160), tapering in strength as 
the frequencies get higher.  I assume some sort of switching power supply, but 
from what I've read most run at higher frequencies than that.  Is this by 
chance a signature of a particular source?

-- 

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.

_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
<Prev in Thread] Current Thread [Next in Thread>