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Am I hearing ACARS and RTTY on the same frequency?

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WrongwayCorrigan:
Once again I am unable to identify a data mode. The closest I can think of is ACARS and RTTY ...an aircraft happened to be transmitting ACARS on a frequency where an RTTY signal was present. I have caught Gander Oceanic frequencies with ACARS signals, but never on 5340 kHz

Receiver: Grundig G6 Aviator
Anntenna: Telescoping Rod
Place of Reception: Northeastern United States
Date: 07/22/2010
Time: 0510 UTC
Frequency: 5340 kHz

http://www.zshare.net/audio/78596407220a9d8a/

cmradio:
5340? I know on 5344 there's an encrypted military RTTY station in Montana. Booms in here at 30 over usually.

Peace!

WrongwayCorrigan:
My radio has a digital display, so it's fairly accurate. Could the signal have drifted off frequency that far?

WrongwayCorrigan:
Is it worth attempting to decode any of this signals with software?

SW-J:

--- Quote from: WrongwayCorrigan on July 25, 2010, 1815 UTC ---My radio has a digital display, so it's fairly accurate. Could the signal have drifted off frequency that far?

--- End quote ---

Chances are, you were tuned above the signal (and BFO'd to audible) whereas normally the rcvr LO is tuned below (and then BFO'd audible) ... the difference being about 4 kHz (high).

A 'consumer'/entry-level radio like the Grundig is a lot like the Degen in performance a couple of us have, and unless the IF filter is swapped out the IF (Intermediate Frequency) BW (Bandwidth) is about 6 kHz wide (maybe even a bit more) ...

A good, normal communications receiver IF BW is around 2.3 or 2.4 kHz wide. Modern ham rigs (like an Icom IC-756ProII ) are adjustable from 3 kHz to less than 1.6 kHz (and also shiftable and infinitely variable) and then the CW filters range from 400 or 500 Hz down to 250 Hz wide.

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