New release (4.5) of MULTIPSK RX/TX: PSK10/BPSK31-63-125/QPSK31-63-125/CHIP (64/128)/PSKFEC31/PSKAM10-31-50/PSK63F - PSK220F + DIGISSTV "Run"/DTMF/CW/CCW/CCW-FSK/THROB/THROBX/DTMF/MFSK8/ MFSK16 (+ SSTV)/MIL-STD-188-141A (+ARQ FAE)/ALE400/OLIVIA/CONTESTIA/RTTYM/ VOICE/DominoF DF/DominoEX/MT63/RTTY 45/75/ RTTY 50+SYNOP+SHIP/ASCII/AMTOR FEC/ PACKET 110-300-1200 + APRS+ DIGISSTV "Run"/PACTOR 1-FEC/PAX+PAX2 + APRS/ FELD HELL/PSK HELL/FM HELL (105-245)/HELL 80/HF-FAX/SSTV/ RX only: AMTOR ARQ/NAVTEX/RTTY 100/1382/GMDSS DSC DSP: Filters + CW binaural reception PSK Panoramic (BPSK31/BPSK63/PSKFEC31): RX 23 channels simultaneously CW Panoramic: RX 8 or 23 channels simultaneously RTTY Panoramic: RX 8 RTTY QSO decoded simultaneously on 22 channels Programmation of Multipsk reception TCP/IP digital modem
CLOCK 1.7.6 (FRANCE-INTER, DCF77, HBG, RUGBY, WWVB, WWV, WWVH, CHU, GPS, JJY) MULTIDEM 2.1.1 Modulator/demodulator for DSB and SdR transceiver Pour les francophones: la version française de ce message se trouve sur mon site (http://f6cte.free.fr). Il suffit de cliquer sur le lien "Principales modifications (courriel avertissant de la sortie de la nouvelle version)". Hello to all Ham and SWL, The new release of MULTIPSK (4.5), CLOCK (1.7.6) and MULTIDEM (2.1.1) are in my Web site (http://f6cte.free.fr). The main mirror site is Earl's, N8KBR: http://multipsk.eqth.info/index.html (click on "United States"). Another mirror site isTerry's: http://www.hamshack.co.uk/ Multispk associated to Clock are freeware programs but with functions submitted to a licence (by user key). CLOCK 1.7.6 has now a possibility to directly interface a SdR receiver through the sound card. MULTIDEM 2.1.1 fixes bugs. The main modifications of MULTIPSK 4.5 are the following: 1) Decoding/coding of the DTMF (Dual-tone multi-frequency) mode. This mode is used for telephone (to dial the phone number) but also in VHF and UHF for different uses as, for example, activation of repeaters by radio. It could be used in HF, for radio control of Ham equipments. Fonctions of DTMF handling on reception are available for licencied copies, only. See specifications further on. 2) New ALE400 mode (ALE in a 400 Hz bandwidth) This ALE system has exactly the same functions as the ones of the "141A" of Multipsk except that: * the bandwidth is 400 Hz instead of 2000 Hz as in standard ALE (so ALE400 can be transmitted anywhere where 500 Hz digital modes are authorized), * the modulation speed is 50 bauds instead of 125 bauds and consequently the text throughput are 2.5 slower, * no fix frequency (as in MFSK16...), the automatic tuning being able to be done thanks to the RS/ID transmission, * the signal to noise ratio is 5 dB better: - 9 dB for sounding, AMD messages and Unproto mode, - 11.5 dB (- 13.5 dB with many repetitions) for ARQ FAE. For ARQ FAE, it has been added a compression system using a modified IZ8BLY (Nino) MFSK Varicode. So the ALE400 text throughput is typically 60 wpm (up to 107 wpm in bilateral and 63 characters frames). ARQ FAE covers all ASCII and ANSI characters (8 bits) There is a Word document which goal is to show from Multipsk snapshots how to do the basic operations in ALE and ALE400. This document (1.1 Mo) is available from my site site "http://f6cte.free.fr/ALE_and_ALE400_easy_with_Multipsk.doc"; (copy and paste this adress in Internet Explorer (or equivalent) Net adress field). Look also at "http://hflink.com/ale400/"; which is a specific page for ALE400, with a lot of information. ALE400 frequencies: 1837.0, 3589.0, 7037.5, 10141.5, 14074.0, 14094.0, 18104.5, 21094.0, 24926.0, 28146.0, 50162.5, 144162.5 (AF at 1625 Hz). 3) Direct SdR interface through the sound card It is the best way to do as there is no additional transmission delay. It allows the working in all digital modes. The modulation and demodulation operations of the I/Q signals coming from the sound card are directly done by Multipsk (which plays the role of a SdR program). The bandwidth considered is the USB side, in base band. So there is neither frequency shift nor consideration of the LSB side. After selection, the working is transparent for the user. 4) Rewind function This function makes you able to decode the signal from a point in time located before you click on the waterfall. It is permitted to select a rewind duration from 5 seconds to 3 minutes (from 20 seconds to 3 minutes for only the licencied copies). Powerful computers can take profit of this function, decoding of the rewind period being quick. For information, for all the Multipsk exotic modes (PSKFEC31, PSK10, PSKAM, PSK63F, PSK220F (+DIGISSTV), CCW-FSK, MFSK8, THROBX, DominoF, DominoEX, PAX, CHIP, Voice, Packet 110 bauds...), I propose the QRP frequency: 14075 Khz USB (AF around 1000 Hz), at 17h00 UTC. 73 Patrick DTMF Description : Duration of the symbol: variable, in general between 40 to 100 ms for the carrier and 20 to 60 ms for the silence which follows the carrier. In Multipsk, the carrier is 60 ms long and the silence 40 ms long (100 ms for the whole character). Note: to a symbol (of 4 bits) corresponds a character. Modulation : MFSK, two groups of 4 tones with 2 tones send in the same time (which give 16 possibilities) Reception mode: FM in VHF, otherwise USB is recommended in HF Character set : 0..9 * # A B C D Shape of pulse : rectangular Tone frequencies: 1st group: 697, 770, 852, 941 Hz and 2nd group: 1209, 1336, 1477, 1633 Hz For example: "1" is composed of the tone 697 Hz and the tone 1209 Hz Bandwidth : about 1000 Hz Demodulation : non-coherent, Correction code : no Convolution code: no Interleaving : no Automatic Frequency Correction: no (frequencies are fixed), Pmean/Ppeak : 1 (about 0.5 if the necessary silences between characters are integered) Lowest S/N : about 2.5 dB (to avoid false detections) In Multipsk, a DTMF code is supposed finished after 2 seconds of silence. It is added a specific character which is the carriage return / linefeed. This one adds 2 seconds of silence. This permits to finish the sequence of DTMF characters which constitutes a definite code. This character is not useful for only one code but can is useful to separate different codes as, for example: 123 345 678 ..... DTMF (FM in VHF and UHF and USB in HF) 1) In FM, on the repeaters frequencies (144,500 to 144,794 KHz and 145,194 to 145.593 Khz). For example in France: "http://f5ad.free.fr/ATV-RES_%20Tableau_des_frequences.htm"; 2) In USB (HF), anywhere but on the frequencies reserved to digital modes (bandwidth >= 1 KHz). Important: as DTMF frequencies are fixed, the chosen frequency will be a multiple of 2 KHz, as for example: 14102, 14104, 14106 KHz... on 20 meters.
