Fw: Re: Filters

[John Q. Doe]

This is some info I got back in January 03. There are probably others. It
would be nice to have a complete list. I sure would be interested in
having it. So If anyone knows of other to add please let us know.
johnph3 at juno.com
--------- Forwarded message ----------
From: Ed Kotkiewicz <ekotkie at EZL.COM>
To: HEATH at LISTSERV.TEMPE.GOV
Date: Sun, 19 Jan 2003 13:47:27 -0600
Subject: Re: Filters
Message-ID: <3E2B00CF.7C406681 at ezl.com>
References: <000801c2bfe4$f225afc0$b1003a41 at oemcomputer>

FRED HOLNAGEL wrote:

> Should know this but don't. What if any difference between 404-283 and
404-328. Also is there another AM filter besides 404-M285P384?(3.75khz.)

EK> The question on SB/HW filters comes up so often I'd like to supply my
data file and maybe everyone will keep a copy of it.

-----------------------------------------------------
Heathkit filters

  404-285 is the Heath "De-Luxe" AM filter.
  3.75 kHz @ 6 db and 10 kHz @ 60 dB.  It was
  used in the SB hamband receivers.

  404-314 is the cheaper AM filter.
  5 kHz @ 6 dB and 15 kHz @ 50 dB.  It was
  used in the SB SW receivers--SB-310 and
  SB-313.

  404-328 is a cheap SSB filter.
  2.1 kHz @ 6 dB and 7 kHz @ 60 dB.
  This filter is used in the HW-101 transceivers.
  I think this filter uses four crystals instead of
  the six used in the better 404-283 SSB filter.

  404-283 is the better SSB filter .
  cf 3.395MHz

  404-284 is the CW filter.
  cf-3395.4KHz Zin-Out 2K.  400 Hz @ 6db
  2KHz @60db

1. These filters are thin cased as compared to the "fat" filters
used in the SB-100 and HW-100.  The thin filters have two center
attach bolts and two center wire connections.  The fat filters
have 4 corner bolts.

2. In a part number that is written as 404-m285p364, the "m" means
that the case is metal.  The "p364" is a paint code and in this
case, means black
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