[App_rpt] URI's and RFI == strange problems!

[Steven Henke]

David,

>From experience and pessimism I had put ferrite cores on all of the
lines to my HF remote from the start.

FYI if there is lots of VSWR on the antenna system or grounding issues
the stray RF can get so bad that ferrites won't help.

And very interesting that the kernel threw a warning message with a
reference to EMI.

Thanks for the report.

73,

Steve Henke, W9SH



On Sun, Aug 24, 2008 at 4:32 AM, David McGough <kb4fxc at inttek.net> wrote:
>
> Hello Everyone,
>
> I encountered the most bizarre problem yet with app_rpt and URI's tonight.
>
> While using my new HF remote base and VHF remote base simultaneously,
> app_rpt consistantly got really confused. After a fresh asterisk start, I
> could try to connect to the HF node. While connecting, app_rpt would
> simultaneously disconnect! --So, I'd hear the connected message and a
> disconnected message at the same time! Then, I couldn't connect to the
> node again, and sometime couldn't connect to VHF node, either.
>
> This problem has been happening very intermittantly for a month now and I
> couldn't find what was causing it. But, it hadn't been severe enough to
> really get my attention.
>
> While searching thru the config files trying to figure out what I'd
> broken, I happened to notice this kernel message:
>
> kernel: hub 2-0:1.0: port 6 disabled by hub (EMI?), re-enabling...
>
> So, I experimentally put ferrite split cores around each USB cable, right
> at the URI--And the problem instantly disappeared! Eureka!!
>
> So, if anyone sees flakeyness or other strange URI problems that come and
> go, RFI could be the cause!
>
> 73, David KB4FXC
>
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