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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">To help correct some of the noted gaps in symbol overlays noted below, I just updated the symbol overlay definitions. <a href="http://aprs.org/symbols/symbols-new.txt">http://aprs.org/symbols/symbols-new.txt</a></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">The intent of these symbols are to allow a user to indicate an unusual or relevant facet of his station or mobile at zero added overhead to his packet since the info is contained simply in his symbol.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">For example for cars, I added P for Plugin hybrid, B for battery electric and F for Fuelcell, H for homemade, etc. For houses, there is no need for Utiiltiy or Mains since that is assumed as a default.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I do not object to adding a Power extension, but abhor its suggestion of deprecating the Symbol Overlay indicators. The symbol overlays are zero cost to the network load. But suggesting the addition of an added 6+ bytes of overhead to every packet is not efficient use of the channel. Such addition should only be used when the symbol overlay is for some reason inadequate.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">To that end I suggest the following changes to the proposed PWR extension:</span></p><p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo4"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Do not deprecate any symbol characters or overlays</span></p><p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo4"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Strongly caution against use when a symbol overlay will do</span></p><p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo4"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><span style="mso-list:Ignore">3)<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Eliminate the default UTILITY and mains options, since that invites people to add 6 bytes of channel overhead to repeat the obvious. </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I welcome any other requests for Symbol Overlays. Bob, WB4APR</span></p><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> aprssig [mailto:<a href="mailto:aprssig-bounces@tapr.org">aprssig-bounces@tapr.org</a>] <b>On Behalf Of </b>Kenneth Finnegan<br><b>Sent:</b> Sunday, February 12, 2017 3:27 AM<br><b>To:</b> TAPR APRS Mailing List<br><b>Subject:</b> [aprssig] [RFC] Power Source Data Extension</span></p><p class="MsoNormal"> </p><div><p class="MsoNormal">As I continue to study the APRS symbol set this year, I've noticed a set of symbol overlays indicating the power source for APRS stations, but their documented application is limited to only a few base symbols and is somewhat sporadic. Houses get all sorts of options for symbol overlays indicating their power, but shelters get none. </p><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">In an effort to free the symbol overlay from trying to indicate both the type of station and the type of power source for the station, I'm proposing a new data extension to indicate power source. </p></div><div><p class="MsoNormal"> </p></div><div><div><p class="MsoNormal">Thoughts?</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Why was 50Hz vs 60Hz handled for houses? I'm a bit at a loss where that would be an issue.</p></div></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal"><a href="https://github.com/PhirePhly/aprs_notes/blob/master/power_capability.md">https://github.com/PhirePhly/aprs_notes/blob/master/power_capability.md</a></p></div><div><p class="MsoNormal"> </p></div><div><div style="border:none;border-bottom:solid #eeeeee 1.0pt;padding:0in 0in 4.0pt 0in"><h1 style="margin-right:0in;margin-bottom:12.0pt;margin-left:0in;border:none;padding:0in;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif;color:#333333">Power Source Data Extension</span></h1></div><p style="margin-right:0in;margin-bottom:12.0pt;margin-left:0in;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif;color:#333333">There has been a proliferation of APRS symbol overlays trying to encode the power source for stations, which suffers from a few issues:</span></p><ol start="1" type="1"><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">Several duplicated sets of symbol overlays for power sources per station type (i.e. solar powered plane, solar powered car, and solar powered house)</span></li><li class="MsoNormal" style="color:#333333;margin-top:3.0pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">Prevents the symbol overlay from being used to convey more important information than the station's power source</span></li><li class="MsoNormal" style="color:#333333;margin-top:3.0pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">Is unable to represent more than one power source at a time</span></li><li class="MsoNormal" style="color:#333333;margin-top:3.0pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">Only gives the ability to indicate power source to a limited list of station types which have symbol power overlays defined</span></li></ol><p style="margin:0in;margin-bottom:.0001pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif;color:#333333">To correct these issues, I am proposing the definition of a new station capability field to be included in the </span><code><span style="font-size:10.0pt;font-family:Consolas;color:#333333"><</span></code><span style="font-family:"Segoe UI",sans-serif;color:#333333"> capability packet or included as a data extension in location or status comment fields.</span></p><p style="margin:0in;margin-bottom:.0001pt;box-sizing:border-box"><code><span style="font-size:10.0pt;font-family:Consolas;color:#333333">PWR=[Unordered list of power source codes]</span></code><span style="font-family:"Segoe UI",sans-serif;color:#333333"></span></p><ul type="disc"><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">B - Battery</span></li><li class="MsoNormal" style="color:#333333;margin-top:3.0pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">C - Coal, natural gas, wood, etc</span></li><li class="MsoNormal" style="color:#333333;margin-top:3.0pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">F - H2 fuel cells</span></li><li class="MsoNormal" style="color:#333333;margin-top:3.0pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">G - Internal combustion generator</span></li><li class="MsoNormal" style="color:#333333;margin-top:3.0pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">H - Hydroelectric</span></li><li class="MsoNormal" style="color:#333333;margin-top:3.0pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">N - Nuclear</span></li><li class="MsoNormal" style="color:#333333;margin-top:3.0pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">S - Solar</span></li><li class="MsoNormal" style="color:#333333;margin-top:3.0pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">T - GeoThermal</span></li><li class="MsoNormal" style="color:#333333;margin-top:3.0pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">U - Utility mains</span></li><li class="MsoNormal" style="color:#333333;margin-top:3.0pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">W - Wind</span></li></ul><p style="margin:0in;margin-bottom:.0001pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif;color:#333333">Multiple sources should be listed as several power source codes immediately following the </span><code><span style="font-size:10.0pt;font-family:Consolas;color:#333333">=</span></code><span style="font-family:"Segoe UI",sans-serif;color:#333333"> with no seperator between power source codes. The list of power sources is terminated by any character which is not an upper case letter [A-Z].</span></p><p style="margin:0in;margin-bottom:.0001pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif;color:#333333">The PWR extension is not meant to differentiate between different sources for utility mains power. The availability of power codes such as geothermal and nuclear are only for completeness, and should not be used by stations which are simply paying their local utility company to operate these sorts of power sources. This means that a power source like </span><code><span style="font-size:10.0pt;font-family:Consolas;color:#333333">PWR=N</span></code><span style="font-family:"Segoe UI",sans-serif;color:#333333"> would be very unusual, since it indicates that the station is operating a nuclear power source.</span></p><p style="margin:0in;margin-bottom:.0001pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif;color:#333333">Stations should indicate the power sources they typically have available, which may not currently all be active. For example, an off-the-grid solar site would beacon </span><code><span style="font-size:10.0pt;font-family:Consolas;color:#333333">PWR=SB</span></code><span style="font-family:"Segoe UI",sans-serif;color:#333333"> to indicate that they are a solar + battery station, despite the fact that the solar panels aren't necessarily producting power during the night.</span></p><p style="margin:0in;margin-bottom:.0001pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif;color:#333333">This means that the PWR extension should never be used as a way to remotely monitor power sources like whether a site has utility power or not (i.e. it switching between </span><code><span style="font-size:10.0pt;font-family:Consolas;color:#333333">PWR=UB</span></code><span style="font-family:"Segoe UI",sans-serif;color:#333333"> and </span><code><span style="font-size:10.0pt;font-family:Consolas;color:#333333">PWR=B</span></code><span style="font-family:"Segoe UI",sans-serif;color:#333333">). The correct way to monitor if a site has power or not is to use one of the boolean telemetry fields to encode the power state and beacon a telemetry formatter such as </span><code><span style="font-size:10.0pt;font-family:Consolas;color:#333333">:MYCALL :PARM.,,,,,AC Power</span></code><span style="font-family:"Segoe UI",sans-serif;color:#333333">.</span></p><p style="margin:0in;margin-bottom:.0001pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif;color:#333333">The PWR extension may be foregone when the power source for a station is unremarkable. For example, house stations only running on wall power (</span><code><span style="font-size:10.0pt;font-family:Consolas;color:#333333">PWR=U</span></code><span style="font-family:"Segoe UI",sans-serif;color:#333333">) or car mobile stations only running on internal combustion generator (</span><code><span style="font-size:10.0pt;font-family:Consolas;color:#333333">PWR=G</span></code><span style="font-family:"Segoe UI",sans-serif;color:#333333">) may forego the additional packet length taken to indicate the obvious.</span></p><p style="margin-right:0in;margin-bottom:12.0pt;margin-left:0in;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif;color:#333333">This power source capability / data extension field deprecates the following symbol overlays (with possible replacements indicated):</span></p><ul type="disc"><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">E^ = Electric aircraft (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=B</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">S^ = Solar powered airplane (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=S</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">E> = Electric car (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=B</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">H> = Hybrid car (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=BG</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">S> = Solar powered car/vehicle (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=S</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">V> = GM Volt (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=BG</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">E# = Emergency powered digipeater (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=?</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">5- = 50Hz mains power, house (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=U</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">6- = 60Hz mains power, house (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=U</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">B- = Backup battery power, house (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=UB</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">E- = Emergency power, house (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=?</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">G- = Geothermal, house (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=T</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">H- = Hydro powered, house (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=H</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">S- = Solar Powered, house (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=S</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li><li class="MsoNormal" style="color:#333333;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif">W- = Wind powered, house (</span><code><span style="font-size:10.0pt;font-family:Consolas">PWR=W</span></code><span style="font-family:"Segoe UI",sans-serif">)</span></li></ul><p style="margin:0in;margin-bottom:.0001pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif;color:#333333">Many of these symbols would likely be replaced with something other than what's listed; e.g. the overlay for a solar-powered house lacked the expressiveness to distinguish if it's a grid-tied solar-powered house (</span><code><span style="font-size:10.0pt;font-family:Consolas;color:#333333">PWR=SU</span></code><span style="font-family:"Segoe UI",sans-serif;color:#333333">) or if it's an off-the-grid house with a battery bank (</span><code><span style="font-size:10.0pt;font-family:Consolas;color:#333333">PWR=SB</span></code><span style="font-family:"Segoe UI",sans-serif;color:#333333">).</span></p><p style="margin:0in;margin-bottom:.0001pt;box-sizing:border-box"><span style="font-family:"Segoe UI",sans-serif;color:#333333">The distinction between 60Hz utility power and 50Hz utility power is not made in this data extension since the possible application of where that distinction would need to be made is incredibly small. For the very few applications where mains frequency would be of any concern to other users, APRS nodes may otherwise include a note on the power frequency. One possible method would be </span><code><span style="font-size:10.0pt;font-family:Consolas;color:#333333">PWR=U(50Hz)</span></code><span style="font-family:"Segoe UI",sans-serif;color:#333333">; power capability parsers should terminate at the '(' and need not process the frequency indication after it.</span></p><div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">--<br>Kenneth Finnegan, W6KWF<br><a href="http://blog.thelifeofkenneth.com/" target="_blank">http://blog.thelifeofkenneth.com/</a></p></div></div></div></div></div></body></html>