During the past weekends ARRL Field Day, we attempted to deploy a AC200P MAX as our primary power source to operate our HF Radios. The Bluetti created so much RFI noise as to make the radios unuseable. We were able to determine that the noise was coming from the 110 connection we were using (unable to check the DC connection as no adapters - yet). Our other power source an EGO generator had no detectible noise.
Are there any suggestions to reducing the interference or modifications to be made? Willing to work with engineering to resolve this. This was not isolated to just the Max, we had two bluettis deployed a 200P and a 200PMax and both exhibited the same noise. Like 7-9 dbi of noise.
Try adding an RF filter inline with the AC output. This includes two toroidal cores with the live and neutral wires wrapped in them, and two capacitors between each wire to ground. Other radio fans can help you buy or even build one.
Thank you, Raymond. That’s the thoughts we were having. We noticed it during ARRL Field Day and didn’t have much in the line of resources or time to figure it out. Although I was hoping that maybe Bluetti might have a solution that wouldn’t require lugging around another piece of gear. Stay tuned as we get closer to a solution and what it took.
Here is a you tube video discussing solar generators and noise. Does Off-Grid Solar Energy Interfere With Ham Radio? - YouTube
Worth watching if you have a few minutes.
At this point I’m guessing that this problem is related to an open Ground on the AC outlet. I have an EGO Nexus Power Station and when I check those outlets they show as correct. I further suspect the open ground because when I connect my radio to the 12v30a power source on the Bluetti, I’m only dealing with my normal noise floor.
You may find this interesting … I have a hi-end system with balanced cables - couldn’t find the hum insertion anywhere - did some research and was directed to my cable source - disconnected Cable TV and the hum was eliminated - total silence and total surprise at the source of the injection.
Note: there is no common point or connection to cable in my audio system which is also filtered with Furman isolation.