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Re: [RFI] Ethernet Extenders

To: RFI@contesting.com
Subject: Re: [RFI] Ethernet Extenders
From: Danny Richardson <k6mhe@k6mhe.com>
Date: Mon, 25 Jun 2007 08:41:57 -0700
List-post: <mailto:rfi@contesting.com>
Inasmuch it seems frequency dependent I suggest 
you might want to check the resonate points for that CAT5 cable.

As Martin has suggested a WiFi may be a better solution.

Danny, K6MHE


David Jordan wrote:
> >
> >
> > Hi folks,
> >
> >
> >
> > This one has really got me wrapped around the axle.
> >
> >
> >
> > At my location I have a barn/ham shack about 
> 1,000 ft from the house. The HF
> > station is a TS-480.  The station is 
> connected to the Internet via a dial-up
> > modem. I have been operating the station via the Internet for about seven
> > years.
> >
> >
> >
> > Recently, I ran CAT-5 cable from the house to the barn. Installed Ethernet
> > extender boxes ( www.netsys-direct.com 
> <http://www.netsys-direct.com/>  ) at
> > both ends and have a nice 1Mbps connection 
> between the two buildings.  So, I
> > now successfully operate the station from the house without using the
> > dial-up connection which is SLOW. The station operates 160-6m. When I issue
> > an instruction to place the TS-480 in transmit mode for CW the link fails
> > and I have to walk down to the barn to un-key the radio. On all bands other
> > than 7MHz and 10MHz this command is 
> successful. With the radio output set to
> > 5 watts and terminated into a dummy load the failure mode is reproducible.
> > However, if I operate SSB I can run the legal limit to the dummy load or to
> > ½ wave dipoles and experience no failure of the Ethernet link. Go figure!
> >
> >
> >
> > Even more interesting is the fact that this failure doesn?t not occur when
> > using the radio with the CAT controller, i.e. sitting at the radio and PC
> > sending commands from the keyboard of the host PC.  Additionally, I do not
> > have this failure when using the dial-up modem. It occurs ?only? when using
> > the Ethernet link and only on 7MHz and 10MHz.
> >
> >
> >
> > I?m beginning to think this is not an RFI issue. Are there any IP gurus out
> > there that think, as I do, that perhaps I 
> have a defective Ethernet extender
> > box which somehow is reading the command string and resetting the link?  I
> > just can?t believe this is an RFI problem that is only specific to CW or AM
> > mode but not SSB on those two bands.
> >
> >
> >
> > Thoughts are welcome,
> >
> > Dave
> >
> > Wa3gin


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