[Elecraft] slightly OT -- acceptable network switch (aka Linksysproduces birdies)

[Bob McGraw K4TAX]

Yes, everything that radiates around your house and even outside your 
QTH for up to several miles will basically be additive to the noise 
floor.  Take away the electricity from a couple of miles around and 
you'd be surprised how quite things become.   As to fiber, I can't say 
our previous copper installation contributed to noise unless the 
offending signal was piggybacked as a host and thus induced into the 
copper service.

As I have done a bit of EME, VHF & UHF , I do understand how every 0.1 
dB of any loss contributes to a higher NF on receive.

I'm surprised to learn that your Honda Generator is clean.  Mine sure 
isn't.  Of course it is an inverter style thus it has switching pulses.

73
Bob, K4TAX



On 2/7/2016 4:22 PM, Edward R Cole wrote:
> Bob,
>
> Could it be that fiber optics cable is the reason?  Not much RFI from 
> photons.  Not everyone has access to fiber.
>
> Recently our commercial power was knocked off by a falling tree so 
> only I had power (from my Honda Gen) and I noticed that the "RF world" 
> was a whole lot quieter.  One could surmise that this was due to no 
> line noise, but also no neighbors had power for their wi-fi's, plasma 
> TV's, grow lights, garage arc welders, etc.
>
> This also told me my home appliances were clean!  So that limits what 
> one can do short of hooking up dummy loads for antennas.  On HF you 
> might try RF filters but that is not a smart thing to do in front of 
> eme low noise figure preamps (i.e. filter insertion loss translates 
> directly into higher NF and the sensitivity of your eme system is 
> destroyed).
>
> Be nice to have fiber...maybe we'll get it about the time you install 
> quantum-linked internet. ;-)
>
> 73, Ed - KL7UW
> ---------------------------------------------------
> Our system arrives with fiber underground to the box the TELCO provided
> on the end of the house.
> ==snip
> To me it is very puzzling why so many seem to have issues and a few do
> not.  I could elaborate about station equipment connectivity.  It would
> most likely start a controversy as to what is correct and what is
> incorrect.  My point, if one is having issues, this should trigger a
> thought to investigate how and what is configured with the station.  In
> some cases, I'm sure certain equipment is more prone to generate
> noise/birdies than others.
>
> 73
> Bob, K4TAX
>
>
>
> 73, Ed - KL7UW
> http://www.kl7uw.com
>     "Kits made by KL7UW"
> Dubus Mag business:
>     dubususa at gmail.com
>
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