I'll second Dave's (below) message. I've been using the Keyspan 4-port
serial adapter for several months and never had a problem. Pricy but good
quality.
Kirk, K6KAR
Niceville, FL
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of d.e.warnick@comcast.net
Sent: Sunday, January 06, 2008 7:37 PM
To: Rick Denney; Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] RFI from USB-to-serial adaptor cable
I'm running a Keyspan 4-port Serial adapter with no problems at all. It came
up as Com 3, 4, 5, & 6 on my system under Vista. Yep, works fine on vista
with MixW to my Omni VI+. Thanks to Carl for the advice
Dave
WA3MKB
-------------- Original message --------------
From: Rick Denney <rick@rickdenney.com>
> Folks,
>
> As it turns out, I'm getting significant RFI from the USB-to-RS232
> cable I'm using to run my RX-320. The cable clearly has some circuitry
> in it, though it must be hiding in the molded plugs. It required a
> devie driver that was the commonly available driver for such devices.
> It works just fine, but when I plug it into the USB port, "band noise"
> increases by about 2-3 S units. I can't hear anything but noise in the
> RFI. It seems to affect 20 meters more than, say, 80 meters, but it's
> always there.
>
> I have tried it with all the other devices from the computer connected
> or disconnected, but the noise vanishes when I pull the USB plug, and
> reappears three seconds after plugging it back in. That three-second
> delay tells me it's a noisy processor in that cable, not something
> like common-mode RFI on the shield (and it is a well-shielded cable
> with a clear jacket).
>
> Options seem to be: Find a PCI-based RS-232 board and don't convert it
> from USB, find an adaptor cable that doesn't create the noise, or find
> a way to shield the adaptor cable in use. I haven't tried ferrite
> beads or the like, but I'm sure others have experienced this same
> issue there is an obvious answer.
>
> (I built the serial cable for connecting the Omni V myself, and
> soldered the shield to the shell of the DB9 and DB25 plugs. I also
> used metallic plug cases and well-shielded cable. There is no noise I
> can detect emanating from that cable.)
>
> Advice craved and appreciated.
>
> Rick, KR9D
>
>
> ---
> Richard W. Denney, Jr. PE|Iteris, Inc.
> Associate Vice President |107 Carpenter Dr. Ste 230 | 703.925.3819
> rwd@iteris.com |Sterling, VA 20164 |Fax 703.471.1757
>
> _______________________________________________
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