HFU HF Underground
Loggings => HF Mystery Signals => Topic started by: ka1iic on December 11, 2014, 1631 UTC
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15710 Khz USB 1619 UTC 12/06/2014 signal was S7 to 8.
Audio file is here:
http://www.vincewerber.org/swl/DAT%3f-15710KHZ-USB-1619UTC-12-06-2014.wav (http://www.vincewerber.org/swl/DAT%3f-15710KHZ-USB-1619UTC-12-06-2014.wav)
Image file is here:
(http://www.vincewerber.org/swl/DAT%3f-15710KHZ-USB-1619UTC-12-06-2014.wav.png)
This signal is intermittent maybe be heard once an hour or less or several bursts can be heard within a much less time.
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This is improperly tuned MIL-STD 188-144A ALE, Automatic Link Establishment. Because it is not tuned correctly I cannot say who it is, but I assume it is on the FEMA F50 frequency of 15708 kHz USB, so it is probably a FEMA station.
What you have here was likely a "sounding", a transmission sent so that all the stations in a network can know the current status of a potential link on that specific frequency.
Here is an example of the same kind of signal correctly tuned: https://www.youtube.com/watch?v=RKlLW_J8kEU
T!
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Thank you Token... I knew you'ld have an answer :-) kudos!