HFU HF Underground
Loggings => Other => Topic started by: ChrisSmolinski on August 02, 2013, 1407 UTC
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The ditter network is active again, observed on:
5575
6550
6725
6750
7025
7700
8275
8825
8900
8975
9050
9225
10050
10575
11025
11150
11225
Off at 1410z.
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Back on again, 1527 UTC.
Observed:
7700
8275
8825
8975
9050
9225
9800
10025
10575
11150
11225
11300
13325
13875
14400
15100
16000
16725
17425
17650
17975
18050
18625
19300
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The ditter network is active again, observed on:
Off at 1410z.
I refer to this signal as "Pips" in my logbook to keep it seperate from the "ditters" name I use for short pulse pirate beacons. My log is a Filemaker Pro database I built years ago, and using the term Pips helps me find past transmissions of this signal in the DB as needed.
1357 to 1410 UTC frequencies observed:
4900
5450
5575
5600
6225
6550
6725
6750
7700
8275
8825
8900 (timing)
8975
9050
9225
10050
10450
10575
11025
11150 (x2)
11225
11300
12025
12450
13100
13250
13325
13875
14400
15100
15550
15625
16000
16350
16550
16725 (x2)
17475
17650
17950 (timing)
17975
18050
18100
18450
18625
19300
20175
The frequencies marked "timing" appeared to have a different timing cycle form the frequencies around it. The pulses are the same length, and they were still 6 seconds between pulses, but the timing of those pulses did not line up with the timing of the pulses around them.
The frequencies marked "x2" showed 2 pulses in 6 seconds, and are possibly common frequencies to two different pulse networks.
T!
(edit) added 5 more frequencies that I found on reviewing the recordings again.
(edit 2) added 4 more frequencies found on even further review of the recordings.
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Back on again, 1527 UTC.
Pips frequencies seen here, 1527 to 1559:30 UTC, some differences from previous hour:
6225
6550
6725
6750
7700
8275
8825
8975
9050
9225
10050
10450
10575
11025
11150 (x2)
11225
11300
12450
13100
13250
13325
13875
14400
15100
15550
15625
16000
16350
16550
16725 (x2)
17475
17650
17950
17975
18050
18625
19300
Note that 11150 and 16725 kHz are still double pulsed. Based on the relative timing of each other freq (one at a time, working away from those) to those two frequencies a person could probably break out what frequencies are related to the two possible networks. But I just don't have the time for that today, grandson would get mad ;)
T!
(edit) Added two frequencies found on review of recordings.
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Thanks Chris, Token,
This is an interesting net. Any idea what it is yet? Too bad that I cannot hear it in Holland
73, Ary
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Ary, it has been caught in Europe before, but only once or twice. I feel pretty sure, based on antenna bearings, that this network is in the US. I am also pretty sure that there is more than one transmit site.
I have no idea what it is, but my guess is it is related to sounders in some way. Several of the frequencies are shared with "pre-beeps" used by a very few chirp sounders, and the pulse length originally seen with this network matched the pulse length of the chirp sounder pre-beep.
T!