Toroid Core FT240-31 Ferrite

RF in the shack was so bad that transmitting interrupted cell phone calls. Used two of these together, looped a cable through them 5 times (max the connector would fit through), RF problem gone. Would definitely buy these again!

I had RFI getting into my computer while operating in digital modes. I used this core to create a choke on the antenna feed line coax where it connects to the tuner. This stopped the problem, and I no longer get "lock-ups" and other RFI symptoms on transmit in digital modes.

Toroid mix 31Just what I needed to create an RF choke .

I have purchased several FT-240-31 toroids in the past and always paid a little more. Looking at other reviews it seems, like me, people find these very useful and of good quality but thought they were a bit pricey. In my opinion, however, this seller removed any reason not to give five stars by lowering their price (below what I paid even three years ago). If you are a radio operator & use flexible coaxial cable, like RG-8X or RG-58, to feed your antennas then you are going to love these! Just pass the antenna connector (ex. PL-259) and at least 2' of cable up through the middle of the toroid and use a vinyl cable tie to secure the toroid to the cable so it can't slide. Then, repeat the process of passing the connector/plug up through the center nine more times, winding counter clockwise until you have ten tight loops around the donut. Finally just secure the cable to the toroid body as it exits the 10th time with another cable tie and "Voila", you now have an choke that will keep stray RF energy from using your feedline to interfere with your station equipment and cause noise. Just FYI the "240" describes the size of the donut and you need one this big to work with coaxial cable the size of RG-8X with PL-259 connectors, and the 31 mix is perfect for use with all the HF bands up to 30 MHz.

The folks at FW Electronics are great. This was a product I needed and wanted. I ordered it and the product arrived quickly and painlessly. Nearly all the way good.I opened the packaging and noticed a discrepancy between what I ordered and what I received. Quickly a mistake was realized and communicated to FW-Electronics. Of course, these discrepancies can cause problems if you aren't careful. FW-Electronics sent a replacement just as quickly and without additional cost to me. For most everyone, these are the critical details. Product sold, good product, fast turnaround, etc. All of those things I report about FW - Electronics.Here's the important part of the review:This company made a mistake, initially. These things happen and nobody was upset. Understanding that toroid core mixes are very specific for use in amateur radio applications (as in other applications). So there's a confidence concern in my case when I lack the test equipment to identify the different mixes.FW - Electronics helped me visually identify the core types and sent the correct (though properly labeled) toroid cores without cost to me, and let me keep the incorrect toroids (which I still will readily put to good use at my QTH or to a deserving ham learning to use RF chokes).My point in this detail is I appreciate great products and great service. But I appreciate it so much more when things *don't* go well and the company and staff make it right.Nobody's perfect, but making it perfect when it isn't shows me the company appreciates the customers' work product and respects their own.I'll keep coming back to FW!73 DE K6RCS

While I can't tell whether it's a genuine Fair-Rite ferrite ring or not, it does a good job of choking common mode current on 10m, 15m, and 20m, from what I have seen so far. The price is fair as well.

Very toroid looking. Made up of itsy bitsy pieces of iron powder, just like a good toroid should. Big enough to do some good toroiding. Actually, I haven't used it yet, but when I do: WATCH OUT. I'm sure this thing will do some serious filtering. I'm not sure how to empty it and how often. Anyone know?

I wound dozens of baluns using this core. As long as they’re from. Fairite you can’t go wrong. If you need them quickly, Amazon is the place to go.