Category Archives: Stubs & filters

A new 4 m Band Pass Filter

Posted on May 23, 2021 by dh8bqa

Having changed the 4 m antenna to a single band one there’s no need to use my trusty coax diplexer anymore (one half of it was described here). It served very well eliminating all the interstation interference between 6 & … Continue reading →

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A band-pass filter for 144 MHz

Posted on July 3, 2020 by dh8bqa

To cure our severe RFI issue described in one of my recent blog posts I decided to order an 144 MHz BPF. Found it on Ebay first but finally ordered from the seller’s Italian web shop directly and saved another … Continue reading →

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Chasing down our RFI issue – success!

Posted on June 1, 2020 by dh8bqa

Spent some time with Heiko, DG1BHA, and Uwe, DL3BQA, chasing down our RFI issue this afternoon that I had reported about in my WPX-SSB blog post. Some systematic testing revealed that it’s worse with a modified TS-590 transmitting on 15 … Continue reading →

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Building a 50 MHz notch filter with coax cable

Posted on May 24, 2015 by dh8bqa

Holidays now! 😎 Decided to visit my goddaughter Anna-Lena (now 4 years old or better young ) near Frankfurt/Oder. Her father is my good friend Sandro, DD3SP. While there he mentioned interference of S5 to S7 between his 50 and … Continue reading →

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