On 10/19/2021 1:16 PM, Julia Tuttle wrote:
Am I missing anything here?
Yes. Most chargers are noisy, because they contain switch-mode power
supplies and regulators. One charger I got from them was noisy. When I
talked to them about it, they sent me a linear charger with simple
hysteresis controller, and it was quiet.
The first thing to do with ANYTHING that plugs into the wall is to check
it for RF noise, using a portable RX like one of those described here.
My favorite is my vintage Kenwood TH-F6A talkie, which has widerange
coverage. Below 10 MHz, it defaults to a loopstick in the base, and with
a software switch to use the SMA connector. I probe with the loopstick
around 2 MHz. One of the Tecsun radios works well too. Check the unit
itself, and any wires connected to it, including the AC line, DC power,
and any signal cables.
http://k9yc.com/KillingReceiveNoise.pdf
http://k9yc.com/KillingRXNoiseVisalia.pdf
73, Jim K9YC
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