[RFI] Computer (maybe just USB subsystem) shutting down

[Pete Smith N4ZR]

Hi Mike et al - it turned out to be not one of the usual USB power-down 
things (mine have been off for years), but an Advanced setting on the CW 
COM port used by Winkey - I think the culprit was "Enable Selective 
Suspend."  Since I turned that off I have not had a single additional 
problem with N1MM crashing.  My station is pretty compliant with K9YC's 
suggestions, but I still see occasional RFI symptoms - just nothing 
critical.


73, Pete N4ZR

On 3/1/2024 6:52 PM, Mike Fatchett W0MU wrote:
> Are we certain that it is an rfi issue and not a power saving 
> "feature" of Windows?
>
> W0MU
>
> On 2/22/2024 12:23 AM, Jim Brown wrote:
>> On 2/21/2024 8:03 AM, Pete Smith N4ZR wrote:
>>> I'm wondering if it could be helpful, from an RFI perspective, to 
>>> put another common mode choke on that cable where it enters my house.
>>
>> Pete and I have corresponded about this directly, so this is for 
>> others reading the mail.
>>
>> My advice, in general, is that if everything is done right with 
>> respect to grounding and bonding, is that chokes on feedlines at the 
>> shack should not be needed. But I've received correspondence from 
>> hams who do not have ADEQUATE chokes at the feedpoints, or that have 
>> not done good grounding and bonding, that chokes on feedlines at the 
>> shack help.
>>
>> Interconnecting cables can pick up transmitted RF from our antennas, 
>> coupling that RF into equipment by the Pin One Problems that are 
>> present in virtually all consumer equipment -- computers, home 
>> entertainment, etc. -- and nearly all ham gear. When visiting ham 
>> conventions, I have yet to see a ham transceiver that didn't have Pin 
>> One Problems. Chokes CAN be necessary on these cables to prevent the 
>> kind of problems Pete is having.
>>
>> 73, Jim K9YC
>>
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