ORIGINAL PRESENTATIONS / PUBLIC CONFERENCE RECORDS / K5QE (SK)
Marshall Williams, K5QE, shared practical knowledge of VHF/UHF station engineering, moonbounce and contest operation. This reference page collects verified publicly available presentations and conference records in one place, with authorship and source attribution preserved.
External links go to the original conference publishers. K0AXX.NET does not claim authorship, ownership, or redistribution rights for Marshall’s slides. An indexed item is not described as an available PDF if the published download is missing.
Technical presentations and expedition reports
| Year | Presentation / record | Publisher and access |
|---|---|---|
| 2019 | Large Vertical Arrays for 6 Meter Contesting Building and operating a substantial vertically stacked 50 MHz array. | PNWVHFS presentation PDF |
| 2016 | On the Dark Side of Sequencing Relays, preamplifier protection and transmit-permission logic. | PNWVHFS, 23-slide PDF |
| 2016 | Activating Saint Martin as TO2EME and Sint Maarten as PJ7/PE1L EME DXpedition operating and logistics. | PNWVHFS presentation PDF |
| 2016 | VHF 101: A First Look at Weak Signal VHF and Up Coauthored by Marshall Williams K5QE and Kent O’Dell KA2KQM. | Eastern VHF proceedings index (PDF link currently unavailable) |
| 2015 | 2 Meter EME from the Falkland Islands Presentation documented on the society’s 2015 program; original slide file not verified. | PNWVHFS conference listing |
| 2013 | EL84 Grid Expedition / K4N Rare-grid activation and expedition experience. | PNWVHFS illustrated archive |
| 2009 | EL58 Grid Expedition / K5N Rare-grid six-meter expedition to the Mississippi River Delta. | PNWVHFS illustrated archive |
Why sequencing matters
Marshall’s sequencing presentation makes a foundational point: a radio should not be allowed to generate RF until the receive preamplifier is protected, the changeover relays have completed movement, and the transmit chain is ready. Mechanical relay timing and contact bounce are real design parameters. A sequencer should control transmit permission—not merely react to RF that has already begun.
Read the new Relay and Sequencing Guide for K0AXX.NET’s independent interpretation and bench-verification checklist. For a lower-noise receive path, see Low-Noise Reception Guide.
Marshall and K0AXX
Marshall introduced K0AXX to the competitive side of VHF/UHF/SHF, and his generosity with station knowledge remains part of the story of this site. The page preserves an educational connection between his work and new station projects without presenting his material as K0AXX’s own.
Further historical material: K5QE memorial archive and Eastern VHF conference paper index.
Archival notes
- Presentation availability can change at the original publisher; check source dates and links periodically.
- Where only a conference listing survives, the archive states that explicitly instead of pretending the slideshow can be downloaded.
- If the original publisher or rights holder provides permission to mirror files, record that permission before hosting copies locally.