Winlink laptop computers and mobile chargers

N0QBH Mike Berg All Messages By This Member #359 While trying out a DC to DC mobile laptop charger today, I discovered the VARA receive signal was getting interfered with when the charger was plugged in. Watching the VARA vector scope, the received Willmar gateway signal looked like a shotgun pattern. Removed the charger and it was a BB, like normal. ? I assumed the PC battery would filter the charger noise, but apparently having the radio and charger on the same supply (car battery, engine running) provided a path for the noise. The charger appears to be well made, just noisy. If you are doing mobile VARA ops and are having trouble, it's something to check. ? 73 Mike N0QBH ?
KF0OUA Leon All Messages By This Member #360 Would ferrite chokes on the charging cables help mitigate that? Asking for a friend because I'm to ashamed to admit I don't know what I'm talking about.?
N0QBH Mike Berg All Messages By This Member #361 Probably worth a try. I have some I could experiment with. Else the plan was to operate on battery only and charge while driving. Inductance can't be sensed, felt or even understood easily. In this case we hope the right amount looks like a high resistance to noise (AC) in the power cable while the DC passes unaffected. ? 73 Mike N0QBH

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