Filters

[Ed Kotkiewicz]

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.

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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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