Just another followup about the 8-ary constellation bursts. By the way, I also want to point out the interesting work that Christoph is pursuing in his blog.
Recently, Martin G8JNJ pointed out two new series of bursts on 2501.2 KHz and 2668.2 KHz USB. Bursts are STANAG-4539 12800bps compliant and use 8 points of the outer ring of the QAM-64 constellation, just like those covered here. The timing of the bursts is a further analogy and appears "connected" to the two previous and following clusters (Fig. 1): this way - if my guess is confirmed- we have now a total of seven clusters, or sets, of channels.
It's worth noting in the tables below that the sequence 2082.2->7822.2 KHz now lasts about 40 seconds (A-G) while the same sequence had previously (i.e. before the two new bursts appear) a duration of 36 seconds (A-F). Therefore, since the introduction of the 2501.2 & 2668.2 KHz bursts have affected the duration of the 2082.2->7822.2 KHz sequence, I'm quite positive that all the bursts belong to the same sequence. But it's just a my guess.
downloads:
https://yadi.sk/d/RlxGYd3sYkWH-A
https://yadi.sk/d/ozXrjS54njfLGw
Recently, Martin G8JNJ pointed out two new series of bursts on 2501.2 KHz and 2668.2 KHz USB. Bursts are STANAG-4539 12800bps compliant and use 8 points of the outer ring of the QAM-64 constellation, just like those covered here. The timing of the bursts is a further analogy and appears "connected" to the two previous and following clusters (Fig. 1): this way - if my guess is confirmed- we have now a total of seven clusters, or sets, of channels.
 |
| Fig. 1 |
 |
| Fig. 2 - the whole sequence A->G |
downloads:
https://yadi.sk/d/RlxGYd3sYkWH-A
https://yadi.sk/d/ozXrjS54njfLGw
No comments:
Post a Comment