ARRL's VHF Digital Handbook by Steve Ford

By Steve Ford

Continuously reliable info in ARRL guides, and this one isn't any exception. definitely worth the rate.

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Is typically used when a new stations comes up and wants to get an up to date status . The query can be constrained to a circle around a given latitude and longitude in which case only stations within that circle reply. APRSD Asks for a list of stations heard direct. Useful for mapping out propagation given that the reporting stations typically have announced their location, altitude, and approximate EIRP. APRSH Asks if you've heard a particular station. WX Solicits weather telemetry from APRS stations equipped with automated weather measurement equipment.

IGates act as gateways to and from the Internet. itJ1V32N} ing from coast to coast and border to border. There are gaps in coverage where one subset of the network is isolated from the rest. Fortunately, APRS uses the Internet to act as a bridge between these areas, unifying the network nationwide. Support find U! It does this fascinating trick through the use of specialized stations known as Internet Gateways, or simfinll TT linltll: fn1" ply [Gates. IGate stations run dedicated software that takes all received Thanks to IGates, you can see position reports from APRS stations throughout country by simply opening a Web browser and doing a query of the FINDU and packets and transfers them to APRS the APRSWorld databases.

Outpost implements Tactical Calls on the Outpost (client) side. Given the current BBS designs, the approach for using Tactical Calls is essentially to find and adopt a call sign structure that satisfies the BBS' call sign checking logic while still making sense in your organization. For instance, through lim ited experimentation with the F6FBB BBS and KPC-3 PBBS, one valid BBS call sign format that could be used as a tactical call is as follows: lCCHHH -- the number "I"; arbitrary, satisfies the BBS need to see a digit --2 letters for the city in which the hospital is located --3 letter abbreviation for the hospital name What does your BBS support?

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