ad) Heathkit Filters
Heathkit used two different physical sizes for the filters in the SB/HW transceivers,
receiver/transmitter pairs, and SWL receivers.
Part no. Model no. Type Bandpass at
-6dB
Bandpass at
-60dB
Used in
Larger Sized Filters
404-200 SSB 2.1 kHz. 5 kHz. SB-100, 300, 400
404-201 AM 3.5 kHz 14 kHz
404-202 CW 400 Hz 2.5 kHz
Smaller Sized Filters
404-283 SBA-310-2 SSB 2.1 kHz. 5 kHz. SB-301, 310, 401, 101
404-284-1 SBA-301-2 CW 400 Hz 2 kHz.
404-285-1 SBA-301-1 AM 3.75 kHz 10 KHz.
404-314 AM 5 KHz. 15 kHz@50db SB-310, 313 only
404-328 SBA-310-1 SSB 2.1 kHz 7 kHz. SB-310, HW-100, 101 only
404-548 CW 400 Hz 2 kHz SB-104, 104A only
Table 9. Heathkit Filters
Be careful of the last one, the 404-548 CW filter. It will ONLY work in the SB-104, 104A
because its center frequency is different, 3395.700 Khz, from all the other CW filters.
Heathkit Filters Page 101
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