NerdFest 2020

US/Mountain
Cher­ry Creek Schools

Cher­ry Creek Schools

4700 South Yosemite Green­wood Vil­lage, CO 80111
    • 08:30 09:00
      DMR Efficiency via Controllerless Trunking 30m

      DMR spectrum utilization is suboptimal using conventional network topologies. Trunking is a natural fit for DMR given its TDMA nature. This talk explains how controllerless DMR trunking works and how it can scale vertically to address shortcomings of conventional DMR systems. We then explore a theoretical implementation of a trunked DMR system in the amateur radio spectrum, how that might be managed and administered, and what advantages and disadvantages is has in relation to current systems.

    • 09:00 09:30
      Magloop Antennas 30m

      I can do a presentation and show-and-tell on mag loop antennas. I have also performed WSPR test results against other antennas for comparison. Mark Skelton has seen the presentation at LARC.
      Ron Schwartz 720-415-3080

    • 10:00 10:15
      Break 15m
    • 10:15 10:45
      RTCM Voting Protocol 30m

      Anyone that has used the Colorado Connection's 145.31 Thorodin repeater
      has used voted receivers to access the repeater.? These voted receivers
      improve coverage for lower power users and users operating in challenging
      places for access to this repeater. This talk describes the problem that
      voted receivers help with, analog voting hardware from the past,? the
      challenge of voting receivers across variable latency Ethernet
      connections, hardware currently in use and an intro to some future
      hardware.

    • 10:45 11:15
      A DMR System Dashboard 30m

      The Rocky Mountain Ham Radio DMR network has grown to over 30 repeaters, linked together through a single, commercial call routing device known as a C-Bridge. The C-Bridge provides a complex, web-based interface used by System Administrators to configure and monitor the repeater network. This talk describes the tools, techniques, and design used to produce a simplified user dashboard that collects information from the C-Bridge administrator web pages, and allows members to monitor activity on the RMHam DMR network.

    • 11:15 11:45
      Exploring slot antennas for mobile applications 30m

      Early investigations and experiments regarding vehicular slot antennas for VHF & UHF mobile applications. Construction, radiation patterns, feeding, matching, other practical concerns.

      This is an open investigation. There will probably be more questions than answers. The content and the author's disposition will continue to evolve up to and possibly throughout the presentation.