Gary,
The switchers will generate RFI regardless of whether pulling current or not –
however, expect the RF signature to change somewhat under load depending on the
design of the unit. My experience is all switchers generate some level of RFI
– the real question is whether it affects frequencies on which you are
operating and the strength of the RFI.
My antenna/tower is about 300 feet from the house. When I beam directly at the
house, on some bands, the entire noise floor rises a dB or so – plus signals I
don’t hear/see emerge out of the noise. Most I live with – the really bands
ones lead to a hunt and destroy mission!
Stu K6TU
On 10/22/17, 12:19 PM, "RFI on behalf of garyk9gs" <rfi-bounces@contesting.com
on behalf of garyk9gs@wi.rr.com> wrote:
I have a question regarding the "turn off the whole house" recommendation.
Before doing so, do you search all of the ham bands looking for noise, say
in conjunction with the P3 set to wide span? Or do you look at the whole
spectrum from the AM bcb to 30 mHz?
I have a pretty quiet location but I still want to eliminate the noise
offenders in my own house.
And then repeat after the main breaker is turned off?
I suppose it makes sense to do the low bands during the daytime and the
higher bands at night when thrre are fewer real signals?
One other question regarding switch mode power supplies like cell phone
chargers and laptop power supplies. If the are plugged into the wall but not
connected to, say a phone, is that good enough or should they actually be
supplying current to a device?
73-Gary K9GS
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