NU5D's "Discriminator audio" and
"RSSI" modifications - If you plan to put up a
repeater, it is strongly recommended that you
read this page and make the suggested modifications. If
you need to do any RF troubleshooting on the
repeater - such as determine sensitivity, find out if there is
enterference, or even just make sure things are working
properly - it is recommended that you check this page
out! The original
link no longer works so this is a locally-archived copy.
co-channel interference - Mark, N5RFX, has
conducted Adjacent/Co-Channel testing similar to those done by
the Utah VHF Society mentioned above: Note that the
equipment used, methodology, and the thresholds for various
aspects of these tests are slightly different from those
described on the Utah VHF Society page above, yielding
slightly different results: The reader must take
these differences into account before attempting to draw
direct comparisons between these two sets of results.The original link no longer
works so this is a locally-archived copy.
about Michigan Repeaters and D-Star - This article
discusses the co-habitation of D-Star and analog repeaters,
D-Star channel spacing, and a few other practical implications
of the integration of D-Star repeaters on the 2-meter band.
during a fatal fire. This page contains a
sobering example of a tragedy that can, in part, be attributed
to shortcomings of the communications system may be found here
and includes audio files and some brief analysis of what
from Daryl Jones' blog.As with any
blog, please use your judgment to weigh possible bias of the
author and its effects of the facts.
Please note that some of the problems
associated with digital, trunked systems do not necessarily
apply to amateur radio implementations of digital voice
technology. It is, however, well-worth the time for a
designer of a radio network - amateur or professional - to
become familiar with these systems and take advantage of
lessons learned by others, applying them to system design, and
to the training of those who are destined to use it!
The above lists are, by no means, exhaustive: Other
information may be found via web searches.
Questions, updates, or comments pertaining
to this web page may be directed to the frequency coordinator.