[RFI] Query for the group.

[Charles Gallo]

Jim, the problem around here with wifi is I can count 14 access points in range, so bandwidth is horrible

I've found making my own Ethernet cables, each with a type 31 1/2 inch ID, Circa 1/2 long with the 3 or 4 turns I can stuff through works well. My problem is living in Queens (part of NYC) wher the houses are all on 40x100 lots, there are a metric ton of RFI sources. I can tell when the neighbors are running their wash, etc. I can't afford $100s of ferrite for every house within say 500 feet, and most would tell me to buzz off, so I live with S7 background noise on some bands. Killing my own stuff helped, as well as the worst of some of the closer neighbors

--  
73 de KG2V
Charlie

> On Jul 25, 2015, at 4:54 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
>> On Sat,7/25/2015 11:51 AM, Kenneth G. Gordon wrote:
>>> On 25 Jul 2015 at 13:31, Randy Farmer wrote:
>>> 
>>> Ethernet birdies.
>> Ah. Makes sense. Dang.
>> 
>>> You're lucky to have only two.
> 
> Each of those birdies around 14030 are synchronized to the clock on someone's router or switch. If you have neighbors, you'll hear a birdie for each of them. Identify your own by killing power to your router or switch. Ethernet also produces birdies around 21060, on the low end of 10M CW, and the low end of 6M. There are also a few on 30M. These are the ones I've noted because I'm a CW op -- if you work SSB, you may find more. :)
> 
>> Well, actually, I don't KNOW that I have only two. On 40 and 80 there appears a
>> "wandering" bit ofpretty loud crap that is pretty broad, and wonders up and down the band at
>> intervals.
> 
>> I haven't tracked that one down yet, but suspect it is some sort of switching power
>> supply somewhere close by.
> 
> Right -- they are harmonics of Switch-Mode Power Supplies. Everything from wall warts to computers to TVs to battery chargers of all sorts.
> 
> 
>> Well, we have both wired and wireless in our local net. Up to 5 computers, 3 of which are
>> hardwired.
>> 
>> And, at this point, then, there isn't much I can do about them, I would suppose.
>> 
>> I have added multiple turns of cat 5 through large ferrite "chokes", but mostly to keep my
>> transmitter out of the hub. That worked.
> 
> Long cables will need a choke at both ends, and you may also need a choke on the power supply cable.
> 
> Consider adding WiFi adapters to your wired computers to eliminate radiation from those cables. I've been using nothing but WiFi in my home and shack (which is in a detached garage), and have all the bandwidth I need -- enough to support streaming audio and video.
> 
> 73, Jim K9YC
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