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Author Topic: 6.530.5Mhz, 6.560.5Mhz, 6.662.5Mhz & 6.713.5Mhz SSB  (Read 1670 times)

Offline EliteData

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6.530.5Mhz, 6.560.5Mhz, 6.662.5Mhz & 6.713.5Mhz SSB
« 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.
« Last Edit: November 18, 2015, 0747 UTC by EliteData »

Online Token

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Re: 6.530.5Mhz, 6.560.5Mhz, 6.662.5Mhz & 6.713.5Mhz SSB
« Reply #1 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!
« Last Edit: November 20, 2015, 0436 UTC by Token »
T!
Mojave Desert, California USA

Offline EliteData

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Re: 6.530.5Mhz, 6.560.5Mhz, 6.662.5Mhz & 6.713.5Mhz SSB
« Reply #2 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.

Offline EliteData

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Re: 6.530.5Mhz, 6.560.5Mhz, 6.662.5Mhz & 6.713.5Mhz SSB
« Reply #3 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/