HFU HF Underground

Loggings => Utility => Topic started by: EliteData on November 18, 2015, 0533 UTC

Title: 6.530.5Mhz, 6.560.5Mhz, 6.662.5Mhz & 6.713.5Mhz SSB
Post by: EliteData on November 18, 2015, 0533 UTC
6.530.5Mhz, 6.560.5Mhz, 6.662.5Mhz & 6.713.5Mhz SSB
is this ACARS or CPDLC data on HF for commercial aircraft ?
i can provide an SDR I/Q sample if you cannot receive this in the east coast of north america - im in NY.
thanks.
Title: Re: 6.530.5Mhz, 6.560.5Mhz, 6.662.5Mhz & 6.713.5Mhz SSB
Post by: Token on November 20, 2015, 0428 UTC
Tuned frequency 6529 kHz USB, 6559 kHz USB, 6661 kHz USB, and 6712 kHz USB are all HFDL frequencies.  The pilot tones for each of these frequencies would be 1.44 kHz higher, or at 6530.44, 6560.44, 6662.44, and 6713.44 kHz.

T!
Title: Re: 6.530.5Mhz, 6.560.5Mhz, 6.662.5Mhz & 6.713.5Mhz SSB
Post by: EliteData on November 20, 2015, 0440 UTC
Tuned frequency 6529 kHz USB, 6559 kHz USB, 6661 kHz USB, and 6712 kHz USB are all HFDL frequencies.  The pilot tones for each of these frequencies would be 1.44 kHz higher, or at 6530.44, 6560.44, 6662.44, and 6713.44 kHz.

T!
thanks!
i obtained the frequency by "zero-beating" in DSB, the 250mS carrier before modulation started which is why its different than what you posted, but you are correct, it was the pilot tone i was "zero-beating" to in DSB, not the actual frequency.
i also discovered at the same time you posted, this:
HFDL - High Frequency Data Link is an ACARS communications media used to exchange data such as Aeronautical Operational Control (AOC) messages, Controller Pilot Data Link Communications (CPDLC) messages and Automatic Dependent Surveillance (ADS) messages between aircraft end-systems and corresponding ground-based HFDL ground stations. Using the unique propagation characteristics of the HF spectrum, the ground stations provide data link communications to properly equipped aircraft operating anywhere in the world. The result, pilots can always communicate with someone on the ground.
Title: Re: 6.530.5Mhz, 6.560.5Mhz, 6.662.5Mhz & 6.713.5Mhz SSB
Post by: EliteData on November 20, 2015, 0457 UTC
and for anyone wishing to read more info and decode it:
info > http://www.kloth.net/radio/hfdl-monitoring.php
software > http://www.chbrain.dircon.co.uk/