I am asking for some help with identifying and elimination of a gruesome noise issue I am seeing on lower frequencies below about 25mHz.
I am posting links to two pictures of the waterfall / panadapter screen on 14mHZ. One is with a narrow signal and the other shows a wider band width signal that comes form the battery charger on my inverter/charger system..
Nosie with Charger On: https://www.dropbox.com/s/0ly5q5fzqz0x7wa/Noise%20Charger%20On.JPG?dl=0
MY BOTTOM LINE QUESTION: To understand what I am seeing and determine if changing to a full sine wave inverter/charger system is the answer. This will mean spending about $2K on a new system so I am hoping to be able to feel confident that this will be money well spent.
I operate from my motor home which has a modified sine wave inverter/charger (Xantrex Freedom 458 http://www.xantrex.com/power-products/inverter-chargers/freedom-458.aspx )
There is a new full sine wave inverter/charger available (Xantrex New Generation http://www.xantrex.com/power-products/inverter-chargers/freedom-sw-12v_newgen.aspx )
My radio is powered directly to 12V off of the batteries. I have four 6 volt batteries wired in series/parallel to provide 12V power.
The problem is definitely coming from the inverter charger. With the inverter in "off" running to curbside AC, I still get a high peak signal on what seems to be 40kHz harmonic. When I have the battery charger "on" there is an added wideband interference that rides on this 40kHz signal.
If I use an MFJ-852 noise meter I do not see any signal near the inverter/charger electrical bay but I do get a low gain signal near the area that my Flex 6500 is located.
I checked the DC with a scope and did see a spike on DC when DC coupled and I get massive signal when AC coupled. I have added an ICT Power Conditioning Module at the DC source to the radio and the scope does show that the AC signal is being filtered. Unfortunately, this filter has not cured the interference.
Thanks in advance for anyone taking the time to provide information / advice.