> 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: -------- 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. -------- For more details, including photo, specs and principles of operation, see: http://leapsecond.com/museum/au2090a/ /tvb _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
