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Author Topic: W3LPL band pass filter design  (Read 1823 times)
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Dillon
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« on: August 09, 2010, 06:45:04 06:45 »


Several years ago I layed out a PCB for a band pass filter designed
by the well known DXer  W3LPL.  I have built sevaral of these
filter systems and used them extensively.  They are great for field
day systems or anywhere you have out of band interference.

Recently redid the PCB and have placed a picture of it, the schematic
and a short writeup on the filter into a pdf and uploaded it to the link below.

If anyone is interested in the eagle files for the PCB and schematic as opposed
to the picture versions please let me know and I will post them here as well.

by the way I recently made several more PC boards using my laser printer
and they look great and work just as great.

http://www.megaupload.com/?d=MUIOXR7K


I hope others will find this usfull

Dillon
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« Reply #1 on: August 09, 2010, 09:59:07 09:59 »

Dillon, thanks for the post.
can you give a few details like operating frequency, filter characteristics, Q etc.

I dont want  to download unnecessarily to find out its RF stuff
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Dillon
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« Reply #2 on: August 11, 2010, 05:52:53 05:52 »

Well the band pass for 160M is from about 1.8 to 1.9 I think (it has been a few years since I measured it) but the Q varies from band to band.  It covers 160, 80, 40, 20 & 10.  These are the contest bands and where it is most useful.  You can scale the values for other bands if you wish  but I have never found a need to do that.

There is a document in the archive that details the bands
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