The truth about ferrites

These tests and experiments were performed by Ian Jackson VK3BUF in the QRM Guru test lab. Much has been said about the importance of applying ferrite clamps, rings and beads to radios and other domestic products to fight QRM. Articles on the correct placement of ferrite noise suppressors are common, but little has been written […]

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HF/VHF Station QRM Kill Kit

The kit (priced estimated at $35) includes: 1 x 61mm ferrite core 1 x 50mm ferrite core 5 x large ferrite snap-ons 5 x medium ferrite snap-ons Application notes on the effective use of ferrite filters This kit will help you reduce QRM from your transmitter, as well as reducing or even eliminating local QRM […]

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The best thing you can do to reduce noise in your radio shack

We’ve spoken about the importance of having good house-keeping in your goal for a low noise environment.  Other posts on QRM Guru talk about various techniques and tools you can use, but in this video Peter, VK3YE provides a great practical demonstration of how you can reduce noise in your shack.  Using Ferrite rings and […]

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Using baluns to minimise noise

Whilst a balun is usually associated with reduced unwanted transmission line radiation (eg. from the feedline and power cord), a balun can also help minimise unwanted noise picked up by your feedline.  This short video provides a practical demonstration.  With thanks to Davide IZ2UUF. You can purchase commercial baluns or make your own.  There are […]

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Using grounding to minimise noise

Good RF grounding should provide a low resistance path to ground for any RF noise which is present. A low resistance path to ground ensures that the noise is conducted away to ground instead of being radiated.  In addition, your station should also have a quality low resistance path to ground. Refer to this link […]

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Using chokes to minimise noise

This article Common-Mode Chokes by Chuck Counselman, W1HIS is well worth reading.  (Credit: Chuck Counselman, W1HIS) We provide links to some VK suppliers for Ferrite cores, snap-ons and beads.  Have a look around their web sites and do some research.   Element14 sells a number of ferrite rings, beads and snap-ons.  Just two examples suitable […]

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Reducing noise in the shack

That Horrible Noise The first place to address unwanted noise is in your own shack.  This process begins when you design and set-up your radio shack.  Consider non-RF noise as well; try to locate your shack away from the TV, living room or kids bedrooms.   Use the following guidelines as a starting point: Earth […]

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