RACAL/THALES Pather-H Intelligent Frequency Hopper

[I-56578]

recording: https://www.dropbox.com/s/otg1cf4zsrcbq ... H.wav?dl=0

These common signals belong to the RACAL/THALES HF transceiver Pather-H, running in the Intelligent Frequency Hopping mode.
The waveform: 760 mSec spaced bursts , ~2500 Hz bandwidth, serial tone with sub-carrier at 1800Hz and PSK-4 2400 Bd manipulation. Always a "train" of 8 bursts during the SOC (Start Of Conversation) sync procedure, after synchronization the next hop is around 2 MHz.
PANTHER-H is an intelligent frequency hopping transceiver and is the result of many years research to find a tactical HF radio system which provides a Low Probability of Intercept (LPI) and anti-jamming protection whilst delivering reliable, good quality communications on all types of HF link. Racal was purchased by Thomson-CSF (now Thales Group) in 2000.
http://www.railce.com/cw/casc/racal/panther-h.htm

Saludos cordiales

[Rapidbit]

Thank you for your analysis.
Saludos

[ANgazu]

Hola.

Esta señal es bastante interesante. Parece que usa la menos 4 canales para esta secuencia de sincronismo, pero su grabacion no es nada facil.


This is a quite interesting signal. It seems to use 4 channels for sync purposes, but recording it is not an easy job.


Saludos cordiales.
ANgazu.

[I-56578]

hola,

Several times I noticed spread spectrum transmissions (Hopping Frequency Spectrum Transmissions, HFSS) after few seconds the end of the SOC sync: possibly it is the traffic just following that sync. Below an eaxmple of these HFSS:



Saludos cordiales

[ANgazu]

Hola.

Algunas veces, aparecen varias secuencias de sincronismo, lo que indica que hay mas de un emisor en el asunto.
En la imagen podemos ver el caso y la emision en FHSS:

dosA.jpg

Hoy hay bastante actividad en esta banda, algo poco usual.

Saludos.
ANgazu.