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C3 Electronics LLC
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CW Test Results on C3 Electronics LLC
80M Digital Bandpass Filter
80M Digital Bandpass CW Test
June 1, 2025
“I received the Ultimate Package shipment today, it is a very nice package!
After seeing that the labels on the product say maximum power on SSB is 100 watts, I wanted to verify that the filters can also handle 100 watts on CW, as that is where I intend to use them.
73, Roger KF9D
Hi Carol,
I have taken your advice and tested the 80 meter digital filter on CW this morning. Here's a screenshot of the filter response before the test."
Photo Provided By: Roger KF9D
Test conditions:
Room Temperature 70 degrees (21 deg C),
Filter suspended in free space with airflow to all surfaces and
directly attached to a commercial dummy load, radio power out set to 100 watts,
thermocouple glued to the top surface of the filter case.
Photos Provided By: Roger KF9D
CW Setup:
“I set up the contest logging software to call CQ at 26 wpm and repeat every 4 seconds for one hour straight, similar to a serious field day effort.
Results:
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I did not notice any change in the SWR on the radio display during the test.
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The filter became warm to the touch after a few minutes, but not hot.
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After 30 minutes the filter top lid temperature had risen by 16 degrees C (to 99 deg F).
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After the one hour test, the filter top lid had risen by 17 degrees C total, so no real change from 30 minutes.
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Ten minutes after the test concluded the top lid temperature had fallen by 10 degrees C.
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Immediately following the test I again did a filter response with the Nano VNA as shown below.”
Photo & Test Result Comments Provided By: Roger KF9D
Conclusion:
The image shows no shift in the filter characteristics from what they were initially. My conclusion based on the single band test is that these filters should perform fine on cw at field day, as long as they are not in direct sunlight.
Thanks for offering a fine product at a reasonable price.
C3 Electronics LLC and Wolf River Coils were located at Booths 56 & 57 during HamCation 2025 in Orlando FL.
Thanks to Steve KO4AFL for interviewing C3 Electronics LLC at HamCation 2025 and sharing this YouTube video. Subscribe to Steve KO4AFL Ham Radio on YouTube
HIGH-QUALITY, PRECISE PRODUCTS
C3 Electronics LLC takes pride in manufacturing high-quality bandpass filters for amateur radio enthusiasts looking to suppress RF interference while operating in close proximity with other operators.
Our products work great for Field Day operations, POTA, in campers or apartment complexes, or whenever you want to work closely with friends or other operators on amateur radio HF bands.
We are passionate about satisfying our customers amateur radio experiences with our products. Visit our Shop page to place an order or visit one of our booths at swapfests to see the quality of our products being displayed or Nano VNA tested.
Locally made in Wisconsin...Help Keep America Great--Buy Our USA Made Products!
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Sleek Design
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Quality Tested for Low SWR and Low Insertion Loss
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Quality Workmanship
and Low-Cost Product
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Available in 10M, 15M, 17M, 20M, 40M, 60M, and 80M Bands
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SO-239 Connections to the radio and antenna
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1-Year Repair/Replacement Warranty
Partial Inside View
Testimonials
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!
Wolf River Amateur Radio Club
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!
Unknown member
July 03, 2024
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.
Guest
June 15, 2024
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.
South Florida
Feb 10, 2025
