Cobra 29LTD Classic questions.

It looks like you have the 1500 watt model. They claim certain electronic items won’t work with this inverter due to the modified sine wave. That’s kind of a red flag to me. That modified sine wave feature alone maybe inducing extra rf noise into your radio. Hopefully the extra ground wire will help.

 

Any thing to do with the radio should be as far from the inter as possible, I had to add mt own home brew filter between my radios and the truck after I added a 3500 watt Triplite inverter, Built out of caps and a full wave rectifier, it was exterme but it ended the ac traveling around the dc circuits.

 

You have to get your swrs set to your antennas

 

Yeah that's a good start, next is get rid of that physical connection with the power and coax lines. Also consider putting a couple chokes on the power cable to stop the line noise from traveling along the line.