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Our club uses these C3E bandpass filter for group events and POTA activations. We usually operate 2 or 3 bands from a park shelter or closely parked cars (all ops within 20-30 yards). Without filters, we hear each other's signals so strongly so can only operate one radio. Since we get quite a few members at our outings, we really need to operate 2 or 3 rigs at the same time. These bandpass filters are well made and provide great isolation. We previously tried the cheap Alibaba filters from China but 2 of 4 arrived rattling parts and not working. We did some research, found C3 Electronics, and are very happy with the 5-band bundle we purchased last fall. On top of that, this company's support is wonderful.

Our Club uses C3 Electronics LLC Bandpass filters every time we go out together to activate in POTA. We sit within 1000 sq ft radius and have 3-4 different bands operating without any interference. Usually we have one operator using FT8 while the other operators are operating on voice (SSB). We couldn't be happier with this great product and the bundles make it very economic for small clubs to purchase.

We searched for bandpass filters previous years and had a difficult time locating them in the United States. Most of the ones we found were from China and required purchasing quantities of 25 of the same bandpass filter and then waiting for 25 days for it to be shipped. Their prices seemed good until you found out how much the shipping cost was and the amount of filters you had to order at one time....No Thank you....our club will stay with "Made in the USA" products that C3 Electronics LLC provides. We received our filters in 3-5 days from time of placing our order....Great products and Great Service made our activations spectacular and very fun.

Definitely recommend this company's products....5 Stars!

This bandpass filter works amazing! I have a few and non of them have failed me. Checking it against other bandpasses I'v seen has shown C3 really takes pride in their work. It fits perfect in my go bag and looks good with my pota setup. I will be getting more and I don't go out without it. Very impressed!

View KB9VBR (Michael Martens) YouTube Video for 2024 Field Day and see how he used C3 Electronics LLC 20M Bandpass Filter in close proximity with antennas and transmitters.

It’s a nice little product. Very passionate about what they’re selling. She’s the real deal and down-to-earth person. I’m sure it’ll come in handy for doing field day operations.