Andy, My first suggestion is to one by one disconnect any peripherals that are connected to the notebook, begin with the battery charger/power-source, and leave the antenna control wires for last. Watch the "S" meter and determine the level of interference contribution of each device connected to the notebook. Ferrites on interfering cables will help if you find that disconnecting the cable reduces the noise.

If you still have interference with everything disconnected, first shutdown any programs that are not used for Satellite operation, then try moving the notebook to different locations and orientations until the noise goes away. Move any cables from the radio away from the notebook. If you still have interference look at the antenna cable, use a quality cable like RG214, RG142, RG 223 with a double shielded braid, or use 100% shielded cables like LMR 195, LMR 400. Radio Shack cables are noted for having a single 40% coverage braid.

Never assume that the noise has only one point of entry. In most cases it comes from several places, being conducted by wiring and radiated by circuitry inside the notebook. Newer notebooks have far less radiated emissions from improved technology. If you are using an old notebook, try to borrow a newer one and see it the problem goes away.

Good Luck, Art,KC6UQH

-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Andy Brian Sent: Sunday, December 25, 2011 6:30 AM To: AMSAT-BB Subject: [amsat-bb] Noise from notebook's PSU

Hi,

I found that I get a high level of noise on my RX from PSU of the laptops. I need notebook for my antenna control and I'm looking how to reduce or minimaze the noise from PSU, any good suggestion are welcome. thanks MX and HNY2012 regards Andy _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

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