A switchable QRP low pass filter for 3.5 and 7 MHz

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A switchable QRP low pass filter for 3.5 and 7 MHz. Useful for QRP rigs that need extra filtering to stop harmonics.

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  1. Amateur Radio VK3YE
  2. LPF
  3. filter
  4. QRP
  5. transmitter
  6. low pass filter
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Комментарии
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Years ago my Heathkit HW-16 transmitted on all of the harmonics. Much to my dismay I received a call from a local ham who said I was transmitting on 20M. At the time I was a Novice and that was a no no. I built a set of filters for each band that the HW-16 covered and tested. No more calls. Great.

johnpawlicki
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I built only the 40m only. I couldn't get two RF chokes so I did the toroid route. The 820 pF is polystyerene film, while the two 390 pF are silver micas. I used an Altoid tin and used the whole tin as the ground; was that what you meant when you said the enclosure should be metal? I did insulate the toroids from the ground with some cork. Wish I can upload a pic. Thanks again for the video Peter. Now i'm going to build the one transistor transmitter so I'd have a signal to filter!

AnhLe-xdlp
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Peter you are a wealth of knowledge. vk2jcc

colinchristie
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Hi Peter, newby question here....are the capacitors in pF? Thank you.

AnhLe-xdlp
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I am hearing fm broadcast radio in my qrp ubitx6 rig will a low pass filter stop this?

markgosnell
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plastic box for transmitters!!! Not good practice. nice video though, thanks

theDaftman