[Elecraft] Mysterious K3 Symptoms - RFI?

[Hisashi T Fujinaka]

I recommend running fiber, but my old day job was in wired networking at
a big chip manufacturer. I think fiber parts are getting a lot cheaper
lately.

On Wed, 13 Mar 2024, Victor Rosenthal wrote:

> I recommend replacing Ethernet cables with wifi when possible, both for
> noise and rfi problems, as well as reducing the chance of lightning damage.
>
> Victor 4X6GP
>
> On Wed, Mar 13, 2024, 16:43 Bayard Coolidge, N1HO via Elecraft <
> elecraft at mailman.qth.net> wrote:
>
>>  Although I don't have an amp, and ran my K3 barefoot, and run my K4D
>> barefoot as well, I do have a 100 foot CAT5E cable running into the shack
>> from the other end of the house, through the attic (there being no basement
>> here in south Florida!). Initially, I was seeing a fair amount of noise
>> from it, and was able to quench it by winding a couple of turns around a
>> small clamp-on choke.
>> That doesn't seem to affect the network performance, so I can reliably run
>> it at 400MBit/second, and it seems to clean up whatever other noise it's
>> picking up from nearby homes (most are on small lots of about 1/5 acre) and
>> the condominium complex next door. I still have some strange noise from
>> other sources coming in from the antenna, and the HVAC's air handler is
>> very noisy, particularly on 30m through 15m, but I know it's not the
>> twisted-pair Ethernet line. My CAT5E cable plugs into a small AC-powered
>> router, and feeds my Mac, the K4D, as well as a laptop occasionally.
>> HTH, and 73,
>> Brandy, N1HO (EL96xh)
>>
>>     On Wednesday, March 13, 2024 at 10:22:02 AM EDT, Pete Smith N4ZR <
>> pete.n4zr at gmail.com> wrote:
>>
>>
>> One culprit I can think of is a 100-foot Ethernet cable between my
>> station and my FIOS router.  I have bought a shielded replacement but
>> have not yet installed it.  After reading some of the recent commentary
>> about so-called "shielded" cables, I'm wondering if this is worth doing.
>>
>> Any suggestions, either K-3-specific or more general, would be much
>> appreciated.
>>
>>
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-- 
Hisashi T Fujinaka - htodd at twofifty.com
BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee