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Ralph Mowery

In article ,
says...

Hi Group, can someone help please, I have an antenna booster that requires a power supply of 6v 100ma, can i use a variable power supply 6v 300ma???

I agree with Dave.

It does not matter what the current rating of a supply ( as long as it
is equal to or greater than what is needed by the device) is if it puts
out the required voltage and not more.

Some wall cubes will be listed at one voltage, but with a much lighter
load will put out much more voltage.

Just think of a voltage regulated supply like your house wiring. Many
circuits are either 15 or 20 amps, but supply less than a tenth of an
amp that many wall cubes and night lights use. Even the newer LED light
bulbs only pull slightly more current than that.

A device that is working properly will only draw the ammount of current
needed.