We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissable in your locale.

Author Topic: Ditter Network 1700UTC 14Jun13  (Read 1160 times)

Offline jFarley

  • Global Moderator
  • DX Legend
  • *****
  • Posts: 5777
  • near Chicago
    • View Profile
    • Email
Ditter Network 1700UTC 14Jun13
« on: June 14, 2013, 1717 UTC »
Ran across a ditter on 11225 just before 1700UTC.  Seems to be about 10x/min.  I had time to check the following freqs from a prev list:

11225 heard
11300 heard
12450 nada
13100 nada
13250 heard
13325 heard
13875 heard
14400 heard
15100 heard
15400 nada
15625 heard
16000 heard

Around 1800 I checked all the freqs in Chris's RadioHobbyist blog list above 16000.  Only 16725 and 18050 were being heard here.

The 11225 ditter was noticeably stronger at 1800 than one hour ago.


« Last Edit: June 14, 2013, 2011 UTC by jFarley »
Joe Farley, Near Chicago
SDR-IQ / R8 / R7
Remote Resonant Loops for HF and LF / ALA 1530
Active 60" Whip / PA0RDT
QSLS appreciated to:    jfarley44@att.net

Offline Token

  • Global Moderator
  • DX Legend
  • *****
  • Posts: 1791
    • View Profile
Re: Ditter Network 1700UTC 14Jun13
« Reply #1 on: June 15, 2013, 0044 UTC »
j, see my post here:

http://www.hfunderground.com/board/index.php/topic,11430.0.html

I hit on 15550 kHz at about 1710 UTC myself, and then found the other freqs I list.  I did not go from an old list although that might have been a smarter way to start.

T!
T!
Mojave Desert, California USA

Offline jFarley

  • Global Moderator
  • DX Legend
  • *****
  • Posts: 5777
  • near Chicago
    • View Profile
    • Email
Re: Ditter Network 1700UTC 14Jun13
« Reply #2 on: June 15, 2013, 0113 UTC »
Thanks, T; saw your post and the freqs you noted.

Technically I had a day off work, but a rather long honey-do list to accomplish.  Just punched the Easy Button and ran down the list as it seemed a little faster to me.

Joe Farley, Near Chicago
SDR-IQ / R8 / R7
Remote Resonant Loops for HF and LF / ALA 1530
Active 60" Whip / PA0RDT
QSLS appreciated to:    jfarley44@att.net

Offline Token

  • Global Moderator
  • DX Legend
  • *****
  • Posts: 1791
    • View Profile
Re: Ditter Network 1700UTC 14Jun13
« Reply #3 on: June 15, 2013, 0126 UTC »
J, I am working on some pictures of the timing relationship across the frequencies, I will post them in the other thread when done.  You can see the sequence of frequency step form the pictures.  The only reason I am posting the info in the other thread instead of here is because I think that is the forum with the historical reports of this, or similar, networks.

T!
T!
Mojave Desert, California USA

Offline Token

  • Global Moderator
  • DX Legend
  • *****
  • Posts: 1791
    • View Profile
Re: Ditter Network 1700UTC 14Jun13
« Reply #4 on: June 15, 2013, 1312 UTC »
J,

I have a working theory that there were two (or more) networks active at the same time.

You reported mostly the same frequencies as I did.  Except you reported 11225 and 11300 kHz being heard that were not on my original list.  In my post I added an edit that several other freqs had been found and it included both of those freqs, as well as 4 others.

Those “added” freqs I could only hear on remotes, not locally.  But several, maybe all, of them appeared to be greatly out of time with the signals I was hearing locally.  They all had the same approximate 124 msec pulse being sent every 6 seconds, but the pulses appeared significantly delayed.  Because of the unpredictable lag in remotes this does not mean much by itself, however one of the remotes (located in CO) could receive both 13325 kHz (that I could hear locally) and 13350 kHz (I could not hear locally) dits on the same waterfall, and there appeared to be several seconds between them on the waterfall.

The same CO remote was able to display three pulses at the same time, 13250, 13325, and 13350 kHz.  13250 and 13325 kHz showed the same spacing as I was seeing locally, 13325 kHz pulsed immediately after 13250 kHz.  However 13350 kHz appeared to pulse roughly 3 or 4 seconds after the other two, or if you prefer 2 or 3 seconds before the other two frequencies.  Also, while 13250 and 13325 kHz were approximately the same signal strength on the remote the 13350 kHz signal was significantly weaker.

I got the impression that 13350 kHz was from a different source than 13250 and 13325 kHz.

In the past once or twice double dits have been noted.  Say the spacing of events is 6 seconds but instead of one pulse per cycle two pulses were noted, separated by a second or two.  I am thinking that maybe there are multiple sources, and the pulse from each source is staggered so that they do not end up on top of each other.

If the 16 frequencies I saw were all in one network and that was all of the frequencies in that network then a complete cycle, transmitting an individual pulse on each freq in sequence, should have taken just under 2 seconds.  My timing images (posted in the other thread) show I missed at least one freq.  This would put the cycle at a tad over 2 seconds.  Lets say I missed a couple of others also.  At 0.124 sec per freq there could have been 24 freqs and still complete the cycle in under 3 seconds.

So, my theory is that possibly, just maybe, there were two networks working in sync.  One network used the first half of the 6 second window (0.0 to 2.999 sec) and the other network used the second half of the 6 second window (3.0 to 5.999 sec).

T!
« Last Edit: June 15, 2013, 1315 UTC by Token »
T!
Mojave Desert, California USA