vintage Sonex, Inc. unit- I believe this is a low frequency 'low pass' Bandpass Filter Assembly -- it consists of a Sonex S-27 Power Supply and five Sonex S-35 Modules: 730 hz; 980 hz; 1.3kHz; 1.7 kHz.; 2.3 kHz. -- all enclosed in a chassis with a multiplicity of connectors on the back including 4 microphone-plug like jacks, with 5 different frequencies -- measures about 3 1/2 by 17 by 17 1/2 in. --
--from a Sonex patent abstract: "A class of band-pass filters are provided, each of which comprises a
plurality of low pass active filters. Each of the filters has related
resonating frequency and damping characteristics. The resonating
frequency and damping characteristics for each of the filters causes all
of the poles of the filters to be along a line parallel to the outputs
of the filter so that the output signals of the filters are summed with
alternate ones of the filters having the output signal inverted with
respect to the other of the filters" --
-- Sonex worked with NASA on the Shuttle program and quite likely on the Apollo program, so this was possibly used by NASA for Space Telemetry -- from the estate of an Optics/Oceanographic Engineer who had ties to NASA --
-- any information regarding this would be most appreciated --
-- wear from use: overall soiling and wear to the exterior/interior seems clean -- on/off switch on the front appears to have a broken toggle: plugged this in and nothing happened even with the switch on the back engaged -- this is sold untested/for parts --
Free Local pick-up is an option. Out-of-country buyers are welcome, but overseas shipping is more.
Each week we post a number of interesting items that have been purchased from Oregon Estate Sales-shipping can be recalculated and combined with multiple purchases-please let me do the calculating for combined shipments before paying.