Heathkit HW-5400 with DDS and Filter Mods by KE9NS

Audio sample of my original 1985 Heathkit HW-5400 2.4khz crystal filter, and my mods that added a custom cpu controlled DDS LO board , and a custom cpu controlled DDS IF BFO board, and 4 & 6khz TX/RX crystal filters. I programmed the keypad to not only allow direct frequency entry, but allow RX/TX filter selection. The IF shift knob now allows RX and/or TX IF shift. The DDS is driven by a TCXO

The operators on 3.630 are operating 6khz wide hence the beautiful RX audio

Recorded with my iPhone

Darrin KE9NS
https://www.ke9ns.com/heathkit.html