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Re: [RFI] RF Quiet Laptop for Mobile Console?

To: RFI List <rfi@contesting.com>
Subject: Re: [RFI] RF Quiet Laptop for Mobile Console?
From: doc <kd4e@verizon.net>
Reply-to: kd4e@verizon.net
Date: Thu, 18 May 2006 19:49:55 -0500
List-post: <mailto:rfi@contesting.com>
> Doc, I have two laptops I use for ham radio purposes: a Mac iBook 900 and an 
> older Dell Latitude 300 (runs Windows 98). Although my Mac is online via a 
> portable satellite internet system (Hughes ne Direcway), both it and the 
> satellite modem can be RF noisy on some HF bands, so I often have to put the 
> Mac to sleep and turn the modem off although my Mac's primary ham radio 
> purpose is to watch for DX spots. The Dell, however is RF quiet (it is never 
> online, so the modem may be disregarded), is used exclusively for HF digital 
> modes (PSK-31, WinLink 2000) and DX logging.
> Both laptops are within 6" of my Kenwood TS-2000 and 18" from my Kenwood 
> TM-261. I hear absolutely no RFI/EMI from either laptop on the 2m rig. My 
> TS-2000 while transmitting does not seem to affect either computer.
> I do not know if newer Dells or Macs generate RFI/EMI. I suppose the use to 
> which the computer will be applied will matter to a significant degree and 
> whether or not it will be connected to a transceiver for digital or control 
> purposes or will be used for non-ham activities (e.g., standard email or web 
> browsing). Given my druthers, I greatly prefer Macs, but Mac ham radio 
> applications are more costly than Windows and there's the occasional EMI 
> factor.
> Both laptops operate directly off 12vdc sources via DC to DC converters 
> (respective DC power supplies; no inverters involved which themselves are RF 
> noisy), plug into cigarette lighter-type plugs.
> 73 de Fred K2FRD

Thank you for that report Fred.

You said you used a dc-dc converter, so the native
voltage for the Dell is something other than 12vdc?
Perhaps 16 or 19 or 24 vdc or something?

Some of the dc-dc converters can be rf noisy as well.

Are you using the Dell dc-dc adapter or some other

Thanks! & 73, doc kd4e  http://bibleseven.com
Ham Links: http://bibleseven.com/hl.html
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