RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog

Go Back   The Forums > Amateur Radio > Amateur Radio Data Transmissions

Amateur Radio Data Transmissions - For discussion of all modes used to send data such as APRS and packet.

LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 11-12-2017, 2:16 PM
Join Date: Nov 2017
Location: Christchurch
Posts: 1
Default Pocsag Numeric and RLL

Hi There,

I am trying to send binary data over pocsag numeric. This works fine until I try to send a sequence 0xfffff (five times 0xF or more).

Because of an unfortunate coincidence, this sequence is sent over the line as 0xffffffff. There is a 10 bit BCH code and a parity included in the codeword.

The receiver however chokes on this because the bandwidth of the receiver can 't go that low. This codeword is sent as carrier + frequency deviation for the channel, so there is no way the receiver can sync again with the transmitter.

I looked at the pocsag specification (*) and there is no mention of RLL ( or any other way to limit the number of consecutive zeros or ones transmitted over the air.

Is there anyone who has experienced the same problem and is there a workaround for it?

Reply With Quote
Sponsored links

data transfer, pocsag, rll

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -5. The time now is 6:08 AM.

Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
All information here is Copyright 2012 by LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2015 by LLC Privacy Policy  |  Terms and Conditions