"Brian Gaff \(Sofa\)" wrote:
OK so I bought my usual wall warts from Amazon, the sort you plug usb
devices in to power them, Unlike usual though these little monsters kick out
an incredible amount of rfi on frequencies from long wave to almost 24mhz a
kind of grating sawtooth modulated by 50 hz.
You cannot get inside, but I'd suggest they have no suppression whatsoever.
They still work of course charge up phones power battery chargers and power
little gadgets.
So I wonder if Amazon would refund me for them?
This then leaves me with another issue, I need two or maybe three that do
not have this added feature of radio jammer under load. I have tested one
from Apple which came with my phone, (but are no longer supplied with
phones), and there is really no sign of interference, so it is possible.
I guess I could buy from Apple and hope their standards are still high, or
if anyone knows of a good source for non interfering ones I'm all ears.


I've no idea about the interference.

But after a couple of bad expereinces with other USB wallwarts I stick to Anker
these days, as they seem a decent .

Of course another possibility is that the 'usual' one you bought were
knock-offs hence different pefroamnce?

But you should be abl to geta refund from Amazon ok. Even if purchased from a
third party seller due to the their A-Z gurantee thing, IME they tend to ide
with the buyer in complaints. We complained about a suitacase (one of a set)
that had a small but annoying fault. We complained to the seller to geta
replacment or whatever, but they never dealt with it satisfactorily. complained
to Amazon, and they refunded the purchase price, and we ened up with free
suitcases.