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<body class='hmmessage'><div dir='ltr'>Currently, POCSAG operation is *really* only supported with a URI (or hand-made USB<br>device) with chan_usbradio (I dont believe I support it in chan_simpleusb yet, but it<br>certainly COULD be...). The mechanism is also supported in chan_voter, but none of the<br>current hardwares support its use.<br><br>If all of that "works" for you (logistically) you then need a transmitter that is capable of<br>REAL DIRECT FM. Any of the common transmitters, commercial or amateur, even with a direct<br>modulation input, have some sort of AC coupling of the modulation input. This will not work with<br>POCSAG paging.<br><br>POCSAG, because of the fact that it is direct FSK, not AFSK, needs a transmitter with direct DC<br>coupling of its modulation input. In other words, the modulation input must be capable of something<br>like this:<br><br>Say, for example, a change of 500mv of modulation voltage changes the transmitter's frequency<br>3 KHz. So, your modulation voltage is normally 2 volts. At that 2 volt input, your transmitter<br>outputs a 440.000 MHz. You raise the modulation voltage to 2.5 volts. Your transmitter then<br>shifts to 440.003 MHz. You keep the modulation voltage at 2.5 volts for 10 minutes, During that<br>ENTIRE 10 minute period, the transmitter stays at 440.003 MHz. <br><br>Any normal, capacitive-coupled input modulator is just NOT capable of doing that (for hopefully<br>painfully-obvious reasons).<br><br>Commercial paging transmitters have a DIGITAL voltage (like just a 0V/+5V) input to select one<br>of the two frequencies (+/- from "center" carrier freqency for FSK). That is how they deal with the<br>true FSK nature of paging.<br><br>Do you have something that will accomplish this?<br><br>Jim<br><br><br><div><hr id="stopSpelling">Subject: Re: [App_rpt-users] Paging<br>From: hammin75@gmail.com<br>Date: Wed, 29 Oct 2014 06:05:05 -0500<br>CC: app_rpt-users@ohnosec.org<br>To: telesistant@hotmail.com<br><br><div>Yep. <br><br>Sent from my iPhone</div><div><br>On Oct 28, 2014, at 11:55 PM, Jim Duuuude <<a href="mailto:telesistant@hotmail.com">telesistant@hotmail.com</a>> wrote:<br><br></div><blockquote><div>
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<div dir="ltr">Are you referring to POCSAG pagers?<br><br><div>> From: <a href="mailto:hammin75@gmail.com">hammin75@gmail.com</a><br>> Date: Tue, 28 Oct 2014 19:02:07 -0500<br>> To: <a href="mailto:app_rpt-users@ohnosec.org">app_rpt-users@ohnosec.org</a><br>> Subject: [App_rpt-users] Paging<br>> <br>> Was thinking about the fuction of getting some alpha pagers tuned up. Can u page from the software if so who has done it and how well does it work. Etc<br>> <br>> Thanks<br>> <br>> Sent from my iPhone<br>> _______________________________________________<br>> App_rpt-users mailing list<br>> <a href="mailto:App_rpt-users@ohnosec.org">App_rpt-users@ohnosec.org</a><br>> <a href="http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users" target="_blank">http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users</a><br>> <br>> To unsubscribe from this list please visit <a href="http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users" target="_blank">http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users</a> and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button"<br>> You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem. <br></div> </div>
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