[Elecraft] Laptop UPS

[Dave G4AON]

Raymond and Jim

I use a Maplin L40BB high power 12 volt input adapter with my Toshiba 
Satellite laptop and it's fine for portable use. I replaced the short 
cigarette plug lead with a longer and higher current one taken straight 
to my leisure battery and also glued the output voltage switch to avoid 
accidents with the wrong voltage being set. It's quiet on HF through to 
1296 MHz, although I don't use end fed wire antennas when portable!

Maplin are at: http://www.maplin.co.uk (enter L40BB to see the adapter). 
The power adapter looks "generic" and will no doubt be available 
elsewhere. They are often on offer from Maplin at half price.

73 Dave, G4AON
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My question : how do you avoid the noise generated by the laptop (OEM) UPS ?

Raymond METZGER

F4FNT