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Old 10-02-2014, 12:59   #1
Guy
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HF radio TX shuts down monitor

Sometimes when we transmit on the HF it causes the USB powered computer monitor to shut off. Is there a way to shield the usb cable or monitor? The HF cabling has all kinds of little coils and ferrites so probably not much to be done with that.
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Old 10-02-2014, 13:09   #2
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Re: HF radio TX shuts down monitor

Did you try some alum foil?
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Old 10-02-2014, 13:33   #3
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Re: HF radio TX shuts down monitor

Have you tried ferries round the usb cable powering the monitor? I had similar problem with a USB keyboard freaking out and a ferrite sorted that out. Might be worth a go.

Sent from my SGP312 using Tapatalk
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Old 10-02-2014, 14:21   #4
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Re: HF radio TX shuts down monitor

SSBs wreak havoc with all sorts of electronics because of the wattage involved, stray currents, and broadcasting on broader frequencies because of bad connections. If you're going to install a choke, start with one on the power supply to the SSB as that is the primary culprit. Adding chokes to the power supplies of equipment that is going bonkers when you transmit is also a good idea. I know of people who can't transmit on SSB when they're using their autopilot (or vice versa) because the AP will go haywire.

Do you get a "brown out" on the rest of the DC system, with your lights dimming, when you transmit on your SSB? One possibility is that your monitor detects the drop in voltage during transmit and thinks it's being shut off or goes into power saving mode or sleep.

Make sure that all the SSB connections, such as between the tuner and the antenna, are clean and secure. Also, try and run any other critical wiring as far from the SSB wiring as you can. Lastly, dial down your transmit power from 150 watts to 50-75. It won't make much difference to the reception of your signal unless you're trying to reach out thousands of miles.
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Old 10-02-2014, 15:33   #5
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Re: HF radio TX shuts down monitor

Power-Line Noise Mitigation Handbook for Naval and Other Receiving Sites

EDIT; Is good policy to make sure you are suppressing at the source to remove attenuation issue.
http://www.hamuniverse.com/rfi.html
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Old 15-02-2014, 08:19   #6
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Re: HF radio TX shuts down monitor

Before getting too involved in the RF side of the investigation, how difficult would it be to hook your monitor to an independent power source ie boost box ? That could at least isolate the problem to RF.

Paul
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