ARLA/CLUSTER: Fwd: New release (4.12) of MULTIPSK - Call ID

[João Gonçalves Costa]

--- Em radioamadores_algarve  yahoogrupos.com.br, "Jose guerreiro" 
<ct1eps  ...> escreveu

New release (4.12) 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 (4.12) is on my Web site 
(http://f6cte.free.fr).
The main mirror site is Earl's, N8KBR:
http://www.eqth.info/multipsk/index.html (click on "United States
Download Site").
Another mirror site isTerry's: http://g90swl.co.uk/multipsk/

Multispk associated to Clock are freeware programs but with functions
submitted to a licence (by user key).

The main modifications of MULTIPSK 4.12

are the following:

1) New Call ID identifier

This "Call ID" ("Call" for "Call sign") identifier can be,
automatically, detected and located. It can be any Call sign or Call
sign 6 characters + Locator. The Call ID is always detected at -13 dB
(first decodings at -18 dB), so with a sensitivity better than the
PSK31 one. The central frequency of the identifier (which is also the
central frequency of the transmission), is determined with a 
precision
of +/- 2.7 Hz.

As soon as this identifier (without any error) is received, Multipsk:

* display, on the waterfall, the call sign, possibly preceded 
by "CQ "
and possibly
followed by "Emergency!" (and a short ring) and the Locator,

* display the call sign (possibly preceded by "CQ ") and the Locator
on the waterfall,

* display the time of reception, the call sign, the Locator and the
Signal to Noise ratio in the Call ID reception window,

* switch on the received frequency (optional),

* display the position the Locator on a map (optional).

This identifier is transmitted in 3.3 sec and has a bandwidth of 172
Hz. It is composed of a RS ID (code 153) followed by a sequence of 56
bits of data and 24 bits of CRC.

It is a free error transmission, i.e in presence of an Call ID, there
are two solutions:

* either the Call ID is not received because the signal is too weak,

* or it is received and it is correct, the probability of detection 
of
a wrong identifier due to radio noise being almost nil.

Refer to the "The_Call_ID_easy_with_Multipsk.doc" paper available on
my WEB site, to use this function easily
(http://f6cte.free.fr/The_Call_ID_easy_with_Multipsk.doc).

Note: for the programmers of coding/decoding softwares

, I propose, on demand, the source in Pascal (Delphi) for the 
creation
and management of the sequence of 56 bits of data and the 24 bits of
CRC.

2) Possibility to immediatly display APRS received position on 
Google Earth.

3) The Multipsk client program (demonstration of the Multipsk control
through a TCP/IP link - sources and .EXE) is now in version 5: new
commands + Call ID / RS ID server comments + some new commands are 
now
non-licencied.

Note about translation of Multipsk.exe and Clock .exe: the 4.11.1
version of Multipsk/Clock has been completly translated to Spanish by
Joachin (EA4ZB), from French. The translation file is on my Web site
(http://f6cte.free.fr).

73

Patrick




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Obrigado. CT1EPS José Carlos

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