Four letter message do not arrive.

unsynchronized / gr-mixalot

POCSAG, FLEX, and GSC encoder blocks for GNU Radio

GNU General Public License v3.0

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Four letter message do not arrive. #30

Open petterreinholdtsen opened 6 years ago

petterreinholdtsen commented 6 years ago

I tried sending a three letter message ('Hei.'), and my pager failed to discover it. Is there something wrong with the handling of short messages? Can others receive short messages?

vanhoteen commented 6 years ago

my only 11 caracters

unsynchronized commented 6 years ago

Hmm, I just successfully sent a bunch of four-letter messages (including that one) to a 512-baud Motorola Advisor.

Can I get more details about the device you're sending to? (model/band/baud) Are you able to reliably send 3- and 5- character messages, but not 4-character ones?

I wouldn't rule out a bug or device-compatibility issue in the code that maps ASCII/Unicode to POCSAG bits -- that code is.. not the best. But so far I can't replicate this one..

esm88 commented 4 years ago

I am having similar issues. This seems to be a bug with the transmission being 'cut short'. The messages must be of a certain length (longer for higher baud rates) because the transmitter is being disabled too early. This isn't noticeable as much with longer messages and lower baud rates, but at 2400 I can clearly hear that the data is not being sent with shorter messages (only the pilot tone can be heard).