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R4C Notch filter
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Bill, the notch, when adjusted properly has pretty good rejection ¡ª something like 40 dB or more.? You may need to do an adjustment per the manual. I¡¯m trying to remember if the C still has the pot on the right side (and of course, I¡¯m riding in a car at the moment).? One thing with a notch, however, is that it notches more or less a single frequency. It will not notch out a range of frequencies. It¡¯s meant to remove an AM carrier or CW signal.? HTH, Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from for iOS On Sun, Feb 9, 2025 at 08:57, Bill Losef via groups.io <w.losefsky@...> wrote:
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Thanks Steve, Every one in a while someone is close by on the band and I try to notch that signal off Bill ? William Losefsky, CCDI, CFDI, CMI Board Certified Criminal Defense Investigator. Board Certified Forensic Death Investigator Forensic Document Examiner Investigative Concepts, LLC ? ?????????
On Sunday, February 9, 2025 at 02:04:42 PM EST, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
Bill, the notch, when adjusted properly has pretty good rejection ¡ª something like 40 dB or more.? You may need to do an adjustment per the manual. I¡¯m trying to remember if the C still has the pot on the right side (and of course, I¡¯m riding in a car at the moment).? One thing with a notch, however, is that it notches more or less a single frequency. It will not notch out a range of frequencies. It¡¯s meant to remove an AM carrier or CW signal.? HTH, Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from for iOS On Sun, Feb 9, 2025 at 08:57, Bill Losef via groups.io <w.losefsky@...> wrote:
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Sometimes, it will work well enough to make the desired signal easier to copy. I¡¯ve used the notch in that way lots of times.? If you¡¯re doing a lot of SSB, you may want to find a 1.5 filter. They¡¯re not as common as the 500¡¯s but they are around. eBay is one place and ke9PQ (Nationwide) is another. You¡¯ll pay more from the latter source but parts there have been tested.? Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from for iOS On Sun, Feb 9, 2025 at 14:10, Bill Losef via groups.io <w.losefsky@...> wrote:
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