New release (4.7) of MULTIPSK
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 (4.7) is 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 Download Site #1).
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).
The main modifications of MULTIPSK 4.7 are the following:
1) Decoding of ACARS mode in VHF
The ACARS (Aircraft Communication Addressing and Reporting System) VHF mode is
a digital datalink system allowing transmission of small messages between
aircraft and ground stations in VHF.
It is available for licencied copies, only (otherwise, the decoding is stopped
after 5 minutes). See specifications further on.
2) GMDSS DSC: possibility to display ships position on a local map chosen by
the user.
3) Interface with:
- DXView, which locates the exported callsign from Multipsk on a map, gives you
geographical information about it and directs your antenna towards this
callsign,
- Pathfinder, which, from the exported callsign from Multipsk, does a search of
the callsign, on the chosen database (QRZ for example) and gives you the
available information about this callsign.
These softwares belong to the DXLAB suite (from Dave AA6YQ).
4) ADIF and DXKEEPER export under 2.1.9 ADIF specification
The submode (32-1000 Hz for Olivia, for example) is exported towards DXKEEPER
version 6.1.0 minimum (DXLAB).
5) addition of RTTY 110, 150 and 200 bauds modes in RX only.
6) ARQ FAE in ALE and ALE400
- Improvement of the Outlook Express (or equivalent) outgoing mails handling,
- Automatic transfert of received ARQ FAE messages, to Internet addresses via
Outlook Express e-mails (for licencied copies),
- Possibility to work in Responder.
7) button N near Name: it is determined and displayed the number of QSO
done with this Ham and the number of QSO done with this Ham and in this mode.
8) Improvement of the radio mailbox for a easier handling of messages.
9) Labels printing for the QSOs of the logbook.
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
ACARS in VHF
The ACARS (Aircraft Communication Addressing and Reporting System) VHF mode is
a digital datalink system allowing transmission of small messages between
aircraft and ground stations via radio (VHF).
Description :
Baud rate : 2400.
Modulation : MSK two tones ( mark and space ) with a shift between tones
of 1200 Hz
(fixed tones at 1200 and 2400 Hz)
Reception mode: AM
Character set : ASCII characters (7 bits) + a final parity bit
Shape of pulse : rectangular
Bandwidth : about 3 KHz
Demodulation : non coherent
Synchronization : automatic using the signal
Detection code : yes on 16 bits.
Interleaving : no
Pmean/Ppeak : 1
According to the ARINC 618 specification, each frame contains:
* a pre-key of 128 bits at 1 (2400 Hz carrier for 0.05 second)
* Bit synchronization. 2 characters + and * to synchronize at bit level,
* Character synchronization: 2 characters SYN (CHR(22)) to synchronize at
character level,
* ACARS start of transmission: character SOH (CHR(1)),
* Mode: a character for the type of transmission with the ground stations (2,
@, A to Z, [, \, ]),
* Address: aircraft registration number. This number corresponds either to an
aircraft type and an airline company or to a flight identifier (airline on 2
characters and number on 4 alphanumeric characters),
* Acknowledgement: a character 0-9, a-z or A-Z for pour the acknowledgement and
the NAK (CHR(21)) character to refuse the acknowledgement,
* label: two characters to designate the type of message,
* Block identifier: on one character 0-9, a-z or A-Z
* End of preamble: character STX (CHR(2)),
* Text: message (optional). The (variable) maximal size is 220 characters,
* Suffix: character ETX (CHR(3)) indicating the end of the message,
* BCS (Block Check Sequence): control code of the frame on 2 characters,
* BCS suffix: character DEL (CHR(127)).
Note 1: Multipsk decodes neither the PSK Acars in VHF nor the HF Acars.
Note 2: Multipsk can fix two single errors.
