Even though I 'think' I have solid ground connections to all equipment, I still get rfi problems, even working low power JT modes. I have little clamp ons on all cables. But the antennas go directly over the roof. (note I'm strictly barefood, no amp)
So can anyone suggest a USB hub that is rf resistant? The one I'm using was advertized as being so but with all the cables to keyboard, keyer, mouse, KNOB etc. I'm looking for any suggestions.
pse et tu de w9ol
trouble free , without strange behavior and with metal body
Sorry to hear you are having issues. RFI is a real pain at times. I've dealt with it and I'm sure I still have it.
For me, not sure about you, the issue is that my station ground runs a fair distance. I am guessing about 30 feet and when I first had it as a big copper wire it acted better as an antenna perhaps than my real antenna and did a very good job of vectoring the RF right back into the shack.
My issue was that things would just glitch. IE transmitting CW, or what ever and suddenly the radio would just reset. In searching I notice you posted something on grounds but there was no text in the post.
Anyway just a side note, what has really helped me is two things:
1) Get the antenna further away. When I put up my End Fed wire the feed point is some 75 feet from the shack and the antenna slopes up and away pretty much to a big tree. This alone took most of the RF out of the shack.
2) The RF eliminator ground in this article:
Since my ground was so long I followed the procedure in this document for the RF elminator ground and it seems to have really worked.
So back to your question: USB hubs... Well I am using about the cheapest ones out there and see no RF problems with them even at 1kw:
I have two of these. One near the computer and one over near the equipment and amp. No issues. I will not say they are the best and from what I can see there is no way to ground them as they use a plastic case. I am just pointing out that by dealing with the RFI using the eliminator and using these HUBS I don't have any issues.
I know the moment I post this some RFI will decide to show up. Just Murphy's law.
What exactly is happening that you think RFI is causing problems in your shack? If the keyboard or mouse cease to function after you transmit, I would change to wireless. I usually do that anyhow for convenience and less cable clutter. If using the snap on chokes, get type 31 cores and sized to fit the individual cables you use them on. Loose fitting snap on cores are not nearly as efficient as cores that are snug to the cable or the cable can be fed through the core to form multiple loops. But first we need to know what the symptoms are you are observing before making further suggestions. What exactly led you to the USB Hub itself?
This is the same hub as my other one that is plugged in. But when this one is plugged in 40 goes to pot. So ordered a new hub today hopefully it works and is not noisy!
It is now smooth sailing.
I was a bit concern about using close to 14v (13.85v) on the 12v rated device, but it doesn't get any hotter that it used to with the original power adapter and it works great now.
The device is identical to THIS ONE
I have been using it for almost a year connected to the power supply 24/7.