I'm hoping someone can help me with so.e tips what to check as I can't really afford to buy a new inverter because of this. I have two of these inverters and only one is jamming both the CB and the 10m Ham radio bands in the entire neighbourhood when the AC is on. When it is charging the batteries from solar it is fine. When it it powering loads it is even worse.

 

So I know the problem is with the AC inverter module.

 

I'm pretty goid with digital electronics and general repair, but I never dealt with such a problem .

 

To summarise, with the inverter off my RF noise floor as seem on an SDR is about -80dB. The moment I seitch the AC on it suddenly transmits huge signals up to 40dB over the noise floor (up to -40dB jamming even the strongest signals). Mostly at 10Mhz, 5Mhz, 20Mhz and then the worst. A continuous chunk between 24Mhz up to 44Mhz of spikes every few tens of KHz raising entire noise floor up. Do CBs and Ham radio in 10m bands are basically unusable here.

 

@BritishRacingGreen @Coulomb maybe you have some tips? The other inverter of the exact same type generates nothing.

 

What parts would you suggest I check first?

 

 

12 hours ago, luk88 said:

I'm hoping someone can help me with so.e tips what to check as I can't really afford to buy a new inverter because of this. I have two of these inverters and only one is jamming both the CB and the 10m Ham radio bands in the entire neighbourhood when the AC is on. When it is charging the batteries from solar it is fine. When it it powering loads it is even worse.

 

So I know the problem is with the AC inverter module.

 

I'm pretty goid with digital electronics and general repair, but I never dealt with such a problem .

 

To summarise, with the inverter off my RF noise floor as seem on an SDR is about -80dB. The moment I seitch the AC on it suddenly transmits huge signals up to 40dB over the noise floor (up to -40dB jamming even the strongest signals). Mostly at 10Mhz, 5Mhz, 20Mhz and then the worst. A continuous chunk between 24Mhz up to 44Mhz of spikes every few tens of KHz raising entire noise floor up. Do CBs and Ham radio in 10m bands are basically unusable here.

 

@BritishRacingGreen @Coulomb maybe you have some tips? The other inverter of the exact same type generates nothing.

 

What parts would you suggest I check first?

 

 

The first thing I would check is if the inverter is properly grounded. Once you rule that out, the issue is most likely with the filter on the AC output stage or some sort of missing shielding perhaps?

Do you have an oscilloscope handy? Does the AC output look ok?

Edited January 14, 20251 yr by HendrikBigChief

Thank you for the reply. Sadly I was mistaken . It is not the inverter. The preamp for the SDR I was doing the testing with was powered by the inverter so the signals dissappeared when I switched it off.

 

Imagine my surprise when I disconnected the inverter ,put it on my bench. I put grid AC  on the line the inverter was powering and the noise came back...

 

So the thread is a bit pointless now.