Toroid Core FT240-31 Ferrite

I use this to create a common mode current balun filter on my HF ham radio to reduce the noise level and RF coming back into my radio shack. It works great on the frequencies that it's designed for and I also purchased another one (FT-240-43) for my VHF radio and they both work great. Make sure you put at least 10 turns on the coax through the toroid and you should be okay. I feel the price point is great and they appear to be high quality components.

It's a Toroid, it works, good price, and just what I needed. I'm happy

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

Quick delivery. Exactly what I needed and received.

i ordered 5 of them because i seen other reviews of how some came broken, as expected 1 out of my 5 was broken, thankfully only 1, they need to up their packaging, HOWEVER the ones that was not broke do make a difference

Came on time, was as advertised.

Great

Parfait, mais je le garde en stock car mon projet a changé :-)

Acquistato per la costruzione di un balun 1:1 per eliminare le correnti di modo comune verso il trasmettitore. Anche se il balun è stato ben costruito, rispettando il giusto collegamento, il balun non funziona molto bene. Forse il toroide non è di grande qualità.

Excelente y de Muy buena calidad solo falta probarlo para lo que fue echó

very good quality. I used them for making up 49:1 ununs. for my radio setup

Very good quality mix 31 toroid. For reference, I used this to make a RF choke. Reduced noise around 7 Mhz, 14 Mhz and above, especially on harmonics of 6-7Mhz where a lot of RFI originates. Also for a reference of its diameter, I was able to very very comfortably wind an RG8X coaxial cable 12 times though it with the PL259 connector attached to it (so the connector and the cable went through the toroid 12 times).