[Boatanchors] QEX Dec 1988 Article

[Grant Youngman]

While not Wetherhold’s filters, there is a Crud-o-ject filter in a 1972 QST which looks to have a similar bandwidth.

I built the later SSB Crud-o-ject which I wish I still had, but parted with a long time ago.  I had it built into a Heath SB-600 speaker.  These were both basically “noise and crud” filters, but the original version for CW is relatively narrow.  Someone also produced commercial versions of these.  It’s too bad that 88/44/22 mH coils have become so seemingly scarce.

Grant NQ5T

> On Jul 12, 2020, at 11:12 AM, <whitebear1122 at comcast.net> <whitebear1122 at comcast.net> wrote:
> 
> Hi, I'm trying to get my hands on an article from December 1988 QEX.  It is
> not available through the ARRL's magazine Archives.  The article is by W3NQN
> titled "CW and SSB Audio Filters Using 88 mH Inductors.  
> 
> 
> 
> I'm looking to build LC SSB and CW audio filters for my homebrew HBR-13
> receiver.  I'd like to narrow up the CW bandpass to something like 800-1000
> Hz.
> 
> Thanks.  73, Scott WA9WFA
> 
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