| article | author | page | issue | |
| Automatically switched half-octave filters: part 1 | WB3JZO and Watkins, Lee R. | 10 | Feb 88 | + |
| Automatically switched half-octave filters: part 2 | WB3JZO and Watkins, Lee R. | 29 | Mar 88 | + |
| Building A Digital Station | NB9K | 9 | Apr 89 | + |
| Ham Radio Techniques: "Son of Woodpecker" | W6SAI | 18 | Feb 89 | + |
| Optimizing the OF-1A Audio Filter | VE7BS | 38 | Dec 89 | + |
| Simple VHF/UHF multiple quarter-wave filters | WA3EWT | 37 | Sep 87 | + |
| Switchable bandwidth crystal filter | N2DCH | 22 | Feb 90 | + |
| Top-down filter design | VE5FP | 41 | Jan 87 | + |