[time-nuts] the end of light bulbs as we know it was Re: Safe power-up. was (Solartron 7075 ...)

Gerald Molenkamp geraldm at COMMTELNS.COM
Wed Oct 12 02:59:06 EDT 2011


Hi Hal,

Good timing, good point. Just got home, switched on radio to look at 1300MHz rx signal strength, it is clean up there. Thunderbolt works fine here.

Noise is from crude switcher with almost no filtering.

Regards

Gerald
VK3GJM

On 12/10/2011, at 17:25, "Hal Murray" <hmurray at megapathdsl.net> wrote:

> 
>> Now to the negative part , noise floor from around 21MHz to well over 500MHz
>> raised to a signal strength 5 to 6 across mid to upper HF / lower VHF to
>> upper UHF with them switched on, otherwise my noise floor is Zero.
> 
>> Lower VHF  to UHF SSB/FM low level signal work is now not possible when LEDs
>> are on, mostly at night when we enjoy the hobby. 
> 
> What is causing that trash/EMI?  Switching power supplies?  PWM?
> 
> How much gets up to 1.4 GHz?  (GPS)
> 
> 
> 
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