I have an ICOM746 (non-pro) and a laptop computer.
The ICOM's headphone jack is plugged into the laptop via a USB sound card because my laptop doesn't have all the normal sound jacks.
Anyhow, if I plug the power supply into the laptop to charge the battery, its somehow inducing so much noise into the radio that listening becomes impossible. The noise drowns out any signal I'm receiving.
Is there a solution to this? Is it because of the junky power supply that came with the laptop or is there something else going on?
I should note that the radio is powered by an isolated (not being charged) 12 volt battery.
I had considered installing a jumper from the 12 volt negative on the battery to the ground plug the laptop is using but not certain that would make any difference.
Maybe a ferrite ring on the power supply cord?
Some kind of DC-DC isolation ?
The ICOM's headphone jack is plugged into the laptop via a USB sound card because my laptop doesn't have all the normal sound jacks.
Anyhow, if I plug the power supply into the laptop to charge the battery, its somehow inducing so much noise into the radio that listening becomes impossible. The noise drowns out any signal I'm receiving.
Is there a solution to this? Is it because of the junky power supply that came with the laptop or is there something else going on?
I should note that the radio is powered by an isolated (not being charged) 12 volt battery.
I had considered installing a jumper from the 12 volt negative on the battery to the ground plug the laptop is using but not certain that would make any difference.
Maybe a ferrite ring on the power supply cord?
Some kind of DC-DC isolation ?