1583RE: [wsjtgroup] laptop RFI--help!
- Dec 19, 2004Hi Andy,
You mention a 12V-19V DC-DC converter, they can be very noisy. Does the
noise drop when the laptop is running on battery alone? The laptop I
have used for roving is an older compaq it is pretty quiet except when
the external power supply has to charge the battery as well as operate
the laptop. When the computer has stopped charging the battery the noise
is very low. My only other suggestion is to try a different DC-DC
Converter. The best ones I have found are made by Zahn Electronics.
From: aflowers@... [mailto:aflowers@...]
Sent: Sunday, December 19, 2004 2:18 PM
Subject: [wsjtgroup] laptop RFI--help!
The new K0SM rover just made it's maiden voyage down the street. I've
upgraded to more metal, and given that I was S4 down in EM25 I think it's
working. My big problem right now is the noise generated by the
computer. It appears to be when the computer is plugged into the
ciggarette lighter in the Honda CRV. All other stuff is directly to the
battery via a rigrunner interface. I wonder what solutions people have
come up with. Right now it's pretty crippling as it raises the noise
floor about 20 dB. I'm using a compaq presario of 1999 vintage I think,
with a standard 12V-19V DC-DC converter on the input. the converter
doesn't seem to be too noisy--just when the computer is turned on.
I'll try another laptop in the meantime, but i wonder if anyone has any
experience with this and can offer some pointers. The older, more
well-behaved computer is SK now...
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