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

App_rpt-users
1

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

2

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

ยทยทยท

On Sun, Aug 24, 2008 at 4:32 AM, David McGough <kb4fxc@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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