Hello and welcome to my Blog, my name is Chris, a bus driver for First Mendip based in Wells, Somerset. I am Chair and H&S rep for the depot branch of Unite the Union. Married to Fiona, we live in Midsomer Norton near Bath, with Boots the cat. My main hobby is Amateur Radio and I hold the call sign G4KVI. I am the repeater keeper for GB3UB and MB7UB. I have a fascination for the weather and all things to do with nature and science. As a Christian I worship, when shifts allow at St. Nicholas Church in Radstock. These are my observations on my life, both at work and at home.

22 Dec 2021

Mains Filter

 


This started out as a way to try and stop my Broadband being knocked out when on HF but has also cut the noise level on the HF bands.

Like most things it all got very complicated etc until I found a blog post from M0NWK https://www.m0nwk.co.uk/mains-electricity-filter-for-emc-noise-reduction/

The construction is simple and straightforward.

Parts list

Fair-Rite type 31 ferrite core. I got mine on Ebay https://www.ebay.co.uk/itm/181209693756

Mains Cable. I used 1mm standard flex.

Box. Got mine from Screwfix

https://www.screwfix.com/p/british-general-ip55-weatherproof-outdoor-enclosure-180-x-110-x-135mm/96153

Construction was easy, I wound 6 turns around the ferrite. This is the recommendation og GM3SEK on his very useful web site http://www.ifwtech.co.uk/g3sek/in-prac/#big31  I used a couple of cable ties to hold it together.

 



The results so far are encouraging. I can now run 50w of FT8 on 17 and 10m without knocking out my G.Fast Broadband. Noise levels on the lower HF bands seem lower but nothing spectacular.

Completed. The 4 way block had been left in the sun!













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