[BVARC] ethernet question

JP Pritchard jppnews at comcast.net
Mon Sep 19 18:17:33 CDT 2022


Thanks Gus.  I went ahead and bought a new switch and it works beautifully. I'm told these simple switches go afutz quite often. I'll just look at it as a cost of having a hobby.

JP

>     On 09/19/2022 2:55 PM Gus Bernard via BVARC <bvarc at bvarc.org> wrote:
> 
> 
>     JP,
> 
>     If the system worked when you bypassed the switch (using the same cables), then the cables are fine.  Before trashing the switch, try moving the cable to a different port on the switch.  Sometimes, an individual port will go bad; and if you find a bad port, try cleaning the contacts with a contact cleaner.
> 
>     Brian,
> 
>     Shielding a cable works if the socket/jack of the device it is connected to is also grounded (on at least one end of the cable).  However, in some configurations, you might need to worry about ground loops if the socket/jack of devices on both ends of the cable are BOTH grounded BUT NOT to the same ground potential. 
> 
>     This could especially be a problem with USB cables between computer and radio.  For EMI issues, sometimes it's better to use toroidal or clamp-on ferrite chokes at both ends, instead.  I had a problem with my IC7200 that was solved only after wrapping both ends of the cable 3 times around Mix 31 clamp-on chokes.  In very bad cases of interference (like RF in the shack), a USB isolator might be needed.
> 
>     Gus, K5GMB
> 
> 
>     On Sun, Sep 18, 2022 at 9:45 AM JP Pritchard via BVARC <bvarc at bvarc.org mailto:bvarc at bvarc.org > wrote:
> 
>         > >         A little help please!
> > 
> >         I normally connect my Anan 7000 transceiver to an eight port switch where it connects with the computer that controls the transceiver. It has worked perfectly for months. But  I am now seeing error messages indicating short intermittent sequence errors (dropped packets I suppose you would call it) between the radio and the computer. As you would expect, the audio drops out when the errors occur.
> > 
> >         First step in my process of elimination was to circomvent the switch and connect the radio directly to the computer. That killed all sequence errors and all worked as it should. Next step in the process was to reconnect the computer and the radio to the switch, but remove the ethernet surge protector from the run between the switch and the radio. That made no difference and the errors resumed. Now I figure it's got to be bad ethernet cable or the switch needs to be replaced. 
> > 
> >         Any thoughts on this from my computer savvy ham friends?
> > 
> >         73, JP, K5JPP
> >         ________________________________________________
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