Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

29 posts


Topic # 63061 20-Jun-2010 09:39
Send private message

Hi Guys,

I have a ADSL connection with snap internet.. This is in no way their problem. I have enquired with them but they have never seen/heard of this before.

I bought a high frequency tig (Tungsten Inert Gas) welder to use out in the garage.. Been using it for a while. Everytime I weld be it AC or DC our internet drops out.

I can hold a connection for weeks with no disconnects.. soon as I weld, Bam.. disconnect.

Nothing else reboots/crashes/power cycles, The router disconnects doesnt power cycle.

It's a Thompson router that you get from telecom when you sign up.

The welder has NOTHING to do with phone lines in any way shape or form.. But, it can draw up to 27 amps input for 200 amps output.


Create new topic
6178 posts

Uber Geek
+1 received by user: 241


  Reply # 343405 20-Jun-2010 10:45
Send private message

Hi, HF welders use both AC or DC output, with an adjustable offset square wave output being more common to achieve either. They use some pretty nasty switch mode power supply techniques to generate this that can cause high frequency radiation, they also output a high frequency signal to assist gas ionization that can be anywhere from 15KHz through to 1MHz depending on the exact welder model.

The ADSL signals range from 25kHz through to 2.2MHz, so it quite reasonable to suspect that the welder is providing enough radiation back into the phone lines or modem to screw the ADSL, even though the welder and phone line/ modem may be several 10s of meters apart.

Its also possible that the power supply on the modem is marginal and the drop in 230V as the welder stricks is enough to drop the modem out of power supply regulation, but as it use a switch mode supply that can probably work down to quite low supply voltages its unlikely, and other applicances would have dropped out also.

So my guess is that radiation from the main switching supply or the HF ionization supply is getting into the phone line and upsetting things. Its possible this could also be coupling via power cables back to the phone line, dont forget that typically the phone line and power feed sit in the main trench coming up your drive let alone being in close proximity within the house frame itself.

Similar issues exist for folks living near large AM transmitters that also share the same spectrum.

I would start looking at the quality of the phone cables and their proximity to power cables, use higher twist rate cables such as cat5 rather than more common phone and cat3 cabling. Ensure you dont have any non twisted pair cables such as phone line cords connecting to your modem.

Do you have any idea if the phone cable is near the welder, even if its an extention line from the house to the garage, if thats the case disconnect it to see if it helps.


476 posts

Ultimate Geek
+1 received by user: 2


  Reply # 343420 20-Jun-2010 11:37
Send private message

I would go with the power drop as well, I found that thomson is very sensitive to power I had the worng power suppy plugged in once and everyting worked but wouldnt establish an adsl connection the difference on the power was .5 amp

1984 posts

Uber Geek
+1 received by user: 133


  Reply # 343589 21-Jun-2010 00:17
Send private message

Then maybe plug tohe modem into a UPS to get a smoother power supply. Is your welding workshop near the Telecom line entry point or any phone lines? If not, maybe its worth moving the modem closer to the entry point, disconnecting the line closest to the welder, and/or installing a hard-wired splitter onto the line with Cat.5 going to your modem jackpoint.

Qualified in business, certified in fibre, stuck in copper, have to keep going  ^_^

6178 posts

Uber Geek
+1 received by user: 241


  Reply # 343619 21-Jun-2010 07:56
Send private message

Have someone watch the modem when you fire up the arc, does the modem reset (ie all lights go through its boot sequence) or does just the DSL light go out, this will determine if its power dropping or interference.


Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

News »

N4L helping TAKA Trust bridge the digital divide for Lower Hutt students
Posted 18-Jun-2018 13:08

Winners Announced for 2018 CIO Awards
Posted 18-Jun-2018 13:03

Logitech Rally sets new standard for USB-connected video conference cameras
Posted 18-Jun-2018 09:27

Russell Stanners steps down as Vodafone NZ CEO
Posted 12-Jun-2018 09:13

Intergen recognised as 2018 Microsoft Country Partner of the Year for New Zealand
Posted 12-Jun-2018 08:00

Finalists Announced For Microsoft NZ Partner Awards
Posted 6-Jun-2018 15:12

Vocus Group and Vodafone announce joint venture to accelerate fibre innovation
Posted 5-Jun-2018 10:52 to launch Kogan Mobile in New Zealand
Posted 4-Jun-2018 14:34

Enable doubles fibre broadband speeds for its most popular wholesale service in Christchurch
Posted 2-Jun-2018 20:07

All or Nothing: New Zealand All Blacks arrives on Amazon Prime Video
Posted 2-Jun-2018 16:21

Innovation Grant, High Tech Awards and new USA office for Kiwi tech company SwipedOn
Posted 1-Jun-2018 20:54

Commerce Commission warns Apple for misleading consumers about their rights
Posted 30-May-2018 13:15

IBM leads Call for Code to use cloud, data, AI, blockchain for natural disaster relief
Posted 25-May-2018 14:12

New FUJIFILM X-T100 aims to do better job than smartphones
Posted 24-May-2018 20:17

Stuff takes 100% ownership of Stuff Fibre
Posted 24-May-2018 19:41

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.