| Title | Author | Page | Date |
| CA1, ten-minute timer from | K8HZ | 74 | Jul 68 |
| HD-10 keyer, positive lead keying | W4VAF | 88 | Nov 78 |
| HD-1410, Cathode key with the | K9XM, N9MX | 80 | Jan 82 |
| HD-1982 Micoder for low-impedance operation | Johnson, Wesley | 86 | May 78 |
| HD-4040 TNC Wilson Mark II and IV, modifications to | W9EPT | 89 | Jan 80 |
| HG-10B, independent keying of | K4BRR | 67 | Sep 70 |
| HM-2102 vhf wattmeter, high power calibration for | W9TKR | 70 | Feb 76 |
| HM-2102 wattmeter mode | K3VNR | 64 | Sep 75 |
| HM-2102 wattmeter, better balancing | VE6RF | 56 | Jan 75 |
| HO-10 as RTTY monitor scope | K9HVW | 70 | Sep 74 |
| HR-2B external speaker and tonepad | N1FB | 89 | Nov 78 |
| HW-7 mods, keying and receiver blanking | WA5KPG | 60 | Dec 74 |
| HW-8, improved keying for | W3HVK | 60 | Aug 82 |
| HW-8, increased break-in delay | K6YB | 84 | Jun 79 |
| HW-8, Improved stability and dial calibration for the | W3HVK | 103 | Nov 83 |
| HW-12 on MARS | K8AUH | 63 | Sep 71 |
| HW-16 keying | W7DI | 57 | Dec 73 |
| HW-16, low-impedance headphones for | WN8WJR | 88 | Jul 77 |
| HW-16, vfo operations for | WB6MZN | 54 | Mar 73 |
| HW-16, vfo operations for | Short circuit | 58 | Dec 73 |
| HW-17 modifications | WA5PWX | 66 | Mar 71 |
| HW-17A, perking up | - | 70 | Aug 70 |
| HW-100 incremental tuning | K1GUU | 67 | Jun 69 |
| HW-100 tuning knob, loose | VE3EPY | 68 | Jun 71 |
| HW-100, HW-101, grid-current monitor for | K4MFR | 46 | Feb 73 |
| HW-100, the new | W1NLB | 64 | Sep 68 |
| HW-101 sidetone control | AD9M | 79 | Jul 79 |
| HW-101, using with a separate receiver | WA1MKP | 63 | Oct 73 |
| HW-202 lamp replacement | W5UNF | 83 | Sep 76 |
| HW-202, adding private-line | WA8AWJ | 53 | Jun 74 |
| HW-202, another look at the fm channel scanner for | K7PYS | 68 | Mar 76 |
| HW-202, fm channel scanner for | W7BZ | 41 | Feb 75 |
| HW-202, Private-line, adding to | WA8AWJ | 53 | Jun 74 |
| HW-2036 mods | Mosher, E.A. | 8 | Jun 81 |
| HW-2036 antenna socket | W3HCE | 80 | Jan 79 |
| HW-2036, carrier-operated relay for | WD5HYO | 58 | Feb 80 |
| HW-2036, Lever action switch illumination | W2IFR | 99 | Jul 78 |
| HW-2036, outboard LED frequency display | WB8TJL | 50 | Jul 78 |
| HW-2036, updating to the HW-2036A | WB6TMH, WA6ODR | 62 | Mar 79 |
| HW-2036, updating the | WA4BZP | 50 | Nov 80 |
| HWA-2036-3 crowbar circuit | W3HCE | 88 | Nov 78 |
| HX-1681 | W2UWO | 83 | Sep 83 |
| IM-11 vtvm, convert to IC voltmeter | K6VCI | 42 | Dec 74 |
| Intrusion alarm | Rossman | 81 | Jun 77
|
| IO-4530 oscilloscope, modifications | Bailey | 20 | Aug 82 |
| Micoder improvements | W1OLP | 42 | Nov 78 |
| Micoder matching | WB8VUN | 8 | Sep 78 |
| SB receivers, RTTY reception with | K9HVW | 64 | Oct 71 |
| SB-100, using an outboard receiver with | K4GMR | 68 | Feb 70 |
| SB-102 headphone operation | K1KXA | 87 | Oct 77 |
| SB-102 modifications | W2CNQ | 58 | Jun 75 |
| SB-102 modifications | W2CNQ | 78 | Mar 77 |
| SB-102 modifications | W2CNQ | 79 | Mar 77 |
| SB-102 modifications | W1JE | 110 | Mar 78 |
| SB-102, receiver incremental tuning for | K1KXA | 81 | Aug 76 |
| SB-102, rf speech processor for | W6IVI | 38 | Jun 75 |
| SB-102, WWV on | K1KXA | 78 | Jan 77 |
| SB-104A, Improved receiver performance for | N2EO | 78 | Apr 81 |
| SB-200 amplifier modifying for the 8873 zero-bias triode | W6UOV | 32 | Jan 71 |
| SB-200 amplifier, six-meter conversion | K1RAK | 38 | Nov 71 |
| SB-200 CW modification | K6YB | 99 | Nov 77 |
| SB-220 transceiver, inrush current | W3GYM | 66 | Dec 80 |
| SB-300, RTTY with | W2ARZ | 76 | Jul 68 |
| SB-301/401, Improved sidetone operation | W1WLZ | 73 | Oct 69 |
| SB-303, 10-MHz coverage for | W1JE | 61 | Feb 74 |
| SB-303 receiver, noise reduction | Suzuki | 70 | Jun 82 |
| SB-400 and SB-401, improving alc response in | WA9FDQ | 71 | Jan 70 |
| SB-400/SB-401, simple speech amplifier for | W8LMH | 72 | Jun 81 |
| SB-610 as RTTY monitor scope | K9HVW | 70 | Sep 74 |
| SB-650 using with other receivers | K2BYM | 40 | Jun 73 |
| SB-series crystal control and narrow shift RTTY with shift RTTY with | WA4VYL | 54 | Jun 73 |
| Heath ten-minute timer | K6KA | 75 | Dec 71 |
| Heath's new all-band transceiver, the SS-MW | W9JUV | 12 | Nov 82 |
| Micoder adapted to low-impedance input | WB2GXF | 78 | Aug 79 |
| SB-series equipment, heterodyne crystal switching | K1KXA | 78 | Mar 77 |
| Sixer, spot switch | WA6FNR | 84 | Dec 69 |
| Heathkit, noise limiter for | W7CKH | 67 | Mar 71 |
| Using an RTTY terminal unit with the | AA8V | 59 | Aug 86 |
| Receiving RTTY with Heath SB receivers | K9HVW | 64 | Oct 71 |
| Monitor scope, RTTY, Heath HO-10 and SB-610 | K9HVW | 70 | Sep 74 |
| RTTY reception with Heath SB receivers | K9HVW | 64 | Oct 71 |
| Seneca As A 2-meter FM Amplifier | W3NNL | 8 | Mar 89 |