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Author Topic: What Causes This Waterfall Display  (Read 857 times)
N4HCI
Member

Posts: 3




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« on: May 05, 2013, 12:41:23 PM »

Have you ever seen this waterfall behavior before (see image below).  This occurs periodically.  It comes through the radio (disappears if radio is turned off) and is not generated by the computer.  It is being received via the antenna (disappears when antenna is disconnected but is present for either antenna input).  Consistently, it responds to narrowing the filter BW and only the center lines remain.  Inconsistently, I can put an 18 db pad in line and it does not seem to weaken.  The 2nd picture shows the display when there are some signals digital signals present.  Its all very strange and the variable frequencies, all emanating from a common frequency point is very odd, and hard to imagine an RF source that would behave this way.  Frequency spacing is about 250 Hz. 

What is the cause for this?

Background:
Residential neighborhood
OCF dipole and 5 band vertical
Xceiver is FTDX 5000
HRD with DM 780

Pix of DM780 Waterfall:
image

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W8JX
Member

Posts: 5489




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« Reply #1 on: May 05, 2013, 01:10:35 PM »

No pictures
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Entered using a  WiFi Win 8.1 RT tablet or a Android tablet using 4G/LTE or WiFi.
N3DT
Member

Posts: 490




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« Reply #2 on: May 05, 2013, 07:35:53 PM »

Yeah, you need to supply a link to the picture on a server like Photobucket or similar, you can't post pictures on this forum.
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