четверг, 22 июля 2010 г.

Updating SA to the version v 6.2.0.7

Updating SA to the version v 6.2.0.7


Updating SA to the version v 6.2.0.7

It is regular updating, which includes fixing of the small errors and problems, which are not having basic value, but nevertheless demanding the decision.

new demo clip "the Review of the top ruler of tools" is added in section of demo of files. The top ruler answers basically for management of a display mode sonograms, and it is desirable to have full idea about possibilities which is in SA.

Good luck.

среда, 21 июля 2010 г.

PSK:TETRA - DMO, terminal to terminal connection

TETRA - DMO, terminal to terminal connection
Direct Mode Operation, Br-18000, pi/4 DQPSK


Author: SergUA6
Band Width ~25000-26000 Hz
Baud Rate 18000 Hz
n-Ary (PSK/MPSK) pi/4 DQPSK
Carrier frequency 15639 Hz, in this example only!
RX mode source I/Q record


Sonograms:
pic.1 Generall view

pic. Manipulation speed

pic.3 Getting of carrier frequency

Diagrams:

pic.4 Generall frame structure

Pictures:

pic.5 Constellation


TETRA - DMO, terminal to terminal connection - the mode of direct terminal (mobile stations, phones etc) connection of TETRA standard, without participation of base stations equipment.

суббота, 10 июля 2010 г.

SA update to version v 6.2.0.6

SA update to version v 6.2.0.6

We certainly cannot guarantee SA work under various emulators, including virtual machines, but nevertheless, for rather popular in LINUX environment WINE, something is already done.

In the current version, we have corrected everything that depends on us, to make SA work more or less correct in WINE.

Althought, we can't solve part of problems, because these are not SA problems, but WINE problems.

***

The format of demo files is reconsidered. Thereupon, the old format is not supported by the current version.

Support of colour scale in comments is added.

Grey colour - the comment is not actual in the present moment of time.
Yellow colour - the new comment.
Light blue (Aqua) - the comment is carried out.

There is the pause in 5 seconds after each comment. This time should be enought to read the comments.

Interruption of the demo, is reazlied throught "Space" key as before. The program supervises possibility of interruption of the demo, and in case of impossibility to stop the demo right now, it warns about it.



The previous demo clip in the new format is here. Also added small demo for check version SA. We do not plan to change format further, as in the current format, possibility of the future expansions is put in advance.

***

Possibility of virtual/analytical shift of a signal by frequency is added in OFDM module.


The sense is that absolutely exact shift on a step, which is multiple to a grid of channeles, sometimes is required atanalysis of OFDM signals. In cases of fractional values of the step, to realize it physically is hard enought, besides it demands presence of free space on/by frequency.

Virtual shift guarantees absolutely exact displacement and, because it is done purely analytically, it does not require neither signal redigitization, nor presence of free space, that is especially important if it is nessecary to shift the signal on 10-30-100 channels upwards or downwards.

Virtual shift, is actual for signals of model A, on signals of B model, this ability is blocked, as it is not necessary in
this case. There will be separate article about it.

***

In generall, providing functioning SA under WINE (in reasonable limits ofcourse), we have solved weight of small implicit problems as a whole. But nevertheless, SA is intended to work under high-grade OS, where we can guarantee something.

Good luck~

воскресенье, 4 июля 2010 г.

Scrambler: Yachta T-219

Yachta T-219
the analogue domestic synchronizable scrambler


Author: SergUA6
Band Width ~2700 Hz
Low Range ~300 Hz
Pilot tone(s): FSK-2 Synchronising sequence with frequency of manipulation 100 Hz, and spacing 150 Hz precisely on the
middle of the speech spectrum
RX mode SSB

Sonograms:

pic.1 Generall view

pic.2 Detalization of sinhro-sequence

Diagrams:
pic.3 Manipulation speed


Scrambler: Yachta T-219 - is the analogue Russian domestic synchronizable scrambler. It's principle is used by many developers of the different countries, at a speech exchange. In FSK mode Sinhro-sequence, which is located precisely on the spectrum middle is transferred. The speech spectrum breaks on two parts, above and below this sequence. All that breaks into unequal time pieces, in which limits these two speech channeles are rearranged by places and inverted. It is considered that Yachta has temporary resistence. This scrambler is widely used by military men for transfer of the operative information with limited limited term of use.