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Portable laptop bonding

Nov 29th 2018, 17:01

AF9FA

Joined: Jun 21st 2016, 18:56
Total Topics: 0
Total Posts: 0
I've been working with digital for some time. In my shack it functions famously. I took it portable a week or so ago. My laptop is a generic Dell, the interface is homebrew with total isolation (Transformers for audio and optocoupler for PTT) The waterfall looks BAD, I didn't even try to transmit. The radio (FT-857d) was being run from batteries as was the laptop. I'm guessing the 'noise' was coming from two completely separate power supplies playing together without a reference? Should the laptop be bonded to the radio chassis? In the shack I have a solid earth ground to everything.
Dec 12th 2018, 19:57

WA8NVW

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
No, the laptop power system is designed to remain isolated. Since you never tried transmitting, the problem is not your rig. It sounds like your receiver is hearing stray RF noise from some exterrnal source, which could include your computer's video.

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