[time-nuts] information about the Austron Synchronous Filter 2090A
Tom Van Baak
tvb at LeapSecond.com
Tue Feb 7 21:58:47 UTC 2017
> Hi, any ideas on what the Austron Synchronous Filter 2090A is for? I
> couldn't find it in the '88 catalog. I recall seeing some hits for it
> in old unclassified DoD R&D publications in the past, wherein it was
> used as part of an experimental LORAN reception setup.
>From the data sheet:
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The AUSTRON Model 2090A Synchronous Filter is a Loran-C waveform averaging system that extends the range and versatility of the AUSTRON Model 2000C Loran-C Receiver in a variety of time/frequency and propagation applications.
Basically, the Model 2090A obtains a pulse waveform average that is taken over a number of pulse group repetition periods and processed for scope display or stripchart recording.
Loran-C waveform averaging accomplishes two important results:
First, most types of coherent CW interference (communication signals, etc.) may be cancelled to zero in less than a second. This type of interference can be particularly troublesome when recording Loran-C waveforms in conventional ways.
Second, averaging improves the waveform signal-to-random-noise ratio in proportion to the effective averaging time. Thus, it is possible to retrieve and analyze Loran-C signal waveforms that are obscured by atmospheric and manmade noise in the normal 20 KHz or 50 KHz receiver RF bandwidth.
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For more details, including photo, specs and principles of operation, see:
http://leapsecond.com/museum/au2090a/
/tvb
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