FLDigi for Narrow-Band Emergency Messaging System FLDigi NBEMS Suite FLDigi for Narrow-Band Emergency Messaging System 11/28/2018

Why NBEMS Communications? Voice communication is not always best Data communications is needed too. List of items Roster of Personnel Part Numbers Images 11/28/2018

The FLDigi Suite fldigi flarq flwrap flmsg Digital sound card modem ARQ file transfer flwrap Checksum verifier and (un)compressor flmsg Form-based Message Generator 11/28/2018

What do you need? Radio Laptop Built-in speaker and microphone can be used Wireless mouse is recommended Touchpads are RF sensitive 11/28/2018

Useful Items External microphone is helpful Interface box That isolates radio from computer Generates PTT signal Adjust audio Levels 11/28/2018

http://www.w1hkj.com/download.html 11/28/2018

FLDigi -Digital Modem FLDigi uses a sound card as a modem FLDigi can Record Audio Capture incoming audio Save outgoing audio Playback saved audio FLDigi can control some Radios FLDigi also has Logging functions 11/28/2018

Setup Download and run install programs Enter Operator and Station Data Configure Interfaces Rig Control Sound Card Adjust Audio Levels Adjust for Sound Card sample rate 11/28/2018

Operator Information Callsign, Name and Location 11/28/2018

Rig Config PTT can be control by: Serial Port Parallel port Other Interfaces 11/28/2018

Select Audio Sources Select Input and Output Audio Sources 11/28/2018

Sample Rate Adjustments WWV mode to adjust sound card's sample rate Use setting from MMSSTV 11/28/2018

“TUNE” Button Generates a continuous single frequency audio signal at the exact frequency to which the waterfall cursor has been set. Peak amplitude of this signal is the peak amplitude of every modem signal generated by fldigi. Use a dummy load and adjust audio level to just below the radio's ALC indicator 11/28/2018

MMSSTV Soundcard Calibration 11/28/2018

FLMsg-forms management editor 11/28/2018

Flwrap-verifiy/compress messages 11/28/2018

“TUNE” Button Generates a continuous single frequency audio signal at the exact frequency to which the waterfall cursor has been set. Peak amplitude of this signal is the peak amplitude of every modem signal generated by fldigi. 11/28/2018

FLMsg-forms management editor 11/28/2018

Message automation 11/28/2018

MT63-2000 Orthogonal Frequency Division Multiplexed 64 parallel carriers Differential BPSK modulated Tolerant of tuning This mode requires a very linear transmitter. Over-driving leads to excessive bandwidth and poorer reception. http://www.w1hkj.com/FldigiHelp-3.21/MT63.html 11/28/2018

Multi-frequency shift keyed (MFSK) A single carrier of constant amplitude is stepped in a constant phase manner. As a result, no unwanted sidebands are generated, and no special amplifier linearity requirements are necessary. The tones selected are set by the transmitted (4 or 5 bit) bit pattern and a gray-code table. Forward Error Correction, so it is very robust Tuning must be very accurate. 11/28/2018

MFSK-16 Pictures Grayscale(B/W) and 24-bit color Double and Quadruple Speed is available Time(sec) = W * H / 1000 for grayscale 320x240=77 seconds Time(sec) = W * H * 3 / 1000 for color 240x180=130 seconds 11/28/2018

Interfaces Soundcard Interface Rig Control Acoustical mike to speaker http://www.kc2rlm.info/soundcardpacket/index.html http://www.qsl.net/wm2u/interface.html Rig Control http://www.iv3sbe.webfundis.net/html/Cat.htm http://www.qsl.net/4s7ab/MixW_ptt.htm 11/28/2018

Digi-Pup Live Linux CD This Bootable CD runs an older version of fldigi in the computer memory 11/28/2018

Resources FLDigi home page WPA NBEMS page MT63 on Wikipedia MMSSTV http://www.w1jkj.com/ WPA NBEMS page http://www.wpaares.org/emcom.html MT63 on Wikipedia http://en.wikipedia.org/wiki/MT63 MMSSTV http://hamsoft.ca/pages/mmsstv.php 11/28/2018