WebVoice Alert built-in simplex voice back-channel for APRS mobiles State APRS pages for each area of the country. ... In North America, 144.39 MHz is dedicated throughout the ... of device. They can use cell phones, blackberrys, pagers, DTMF HT's or just about any other kind of device. See the web page: Universal Text Messaging Initiative. Webor send email to [email protected] (outside North America). simplex at beginning of step reflection reflection and expansion contraction multiple contraction (a) (b) (c) (d) high low Figure 10.4.1. Possible outcomes for a step …
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Band Plan - American Radio Relay League
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