I purchased one of my LP filters from W1VLF several years ago, but I'm not sure if he's still in the business. The second one I built myself from the following article and it works quite well:

http://www.qrp.pops.net/ndb.asp

73,
Jerry Sharp, KD0GS


Dr. J Roth wrote:
You beat me to the punch with that question Steve. Thanks for the great link Frank. At $100 with shipping, I think I'll be searching for schematics so I can roll my own.
Joe WC4R

From: f...@me.com
Date: Sun, 14 Mar 2010 17:34:23 +0100
To: victo...@yahoo.com
CC: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] low pass filter for reception below 500 kc

http://www.kiwa.us/LPF.html

might be something for you. I do not know the actual performance of this 
filter- so YMMV.

73, Frank DG1SBG

Am 14.03.2010 um 17:29 schrieb Stephen Victor:

Does someone have a reference for how to obtain or build such a filter?

Thanks and 73
Steve WA2DTW


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