[Elecraft] RS232 Noise

[Mike Harris]

Hi Arunas,

There could be something in this old PC idea.  Mine is a 700MHz P3 vintage 
2000.  Slower internal clocking maybe.  However the first thing I am doing 
is making up a new CAT5 based serial cable.  Might even try the USB-RS232 
converter I have to see if anything changes.

Regards,

Mike VP8NO

----- Original Message ----- 
From: "LY2IJ" <ly2ij at qrz.lt>
To: <Elecraft at mailman.qth.net>
Sent: Friday, April 24, 2009 5:54 AM
Subject: [Elecraft] RS232 Noise


| Hi,
|
| I had the same problem on 160m - floating spur was up to S5..7 with
| antenna disconnected. I tried with 5 different brands serial cables,
| ferrite chokes, used different laptop power supplies,  but that didn't
| help at all. Only solution was to change computer to newer one.
| I made K3 "Improving the Immunity of the Rear-Panel RS232 and Audio
| Connectors to RFmodifications" latter on, but didn't check old computer
| after.
|
| No idea about other bands.
|
| 73
| Arunas / LY2IJ /k3 #500