just for show-and-tell:
I've been disassembling the Schmomandl ND100M oscillator block to see if I could use it. I figured, it's the bird in hand, and once was a high quality piece of equipment so maybe... The physical construction is great. Lots of fine pitch slot head machine screws. Lots of silver plating. The oscillator unit is long and narrow. It goes in the 19" rack mount unit in the "depth" direction, front to back in the upper left hand corner of what turns out to be a more or less solid block of plated boxes that make up the whole frequency generator. Decade controls on the front are switches only. Each is wired to a decade unit/card and the decade units are fed signal all in series. Computerish connectors at the back reproduce the decade switches in some manner, so the thing can be remotely controlled for frequency output. I have four rough pictures. www.yipyap.com/radio_stuff/ND100M/One.pdf is right (rear) end of the component side. www.yipyap.com/radio_stuff/ND100M/Four.pdf is the left (front) end of the component side. www.yipyap.com/radio_stuff/ND100M/Two.pdf is a blurry closeup of the center from the trace side. www.yipyap.com/radio_stuff/ND100M/Three.pdf shows the power connector (+13.6, -11), two series resistors on those power lines, and 8 output lines. Some of the outputs are 10 Mhz. At least one is 1 Mhz. The center crystal cannister is electrically isolated. It is on acrylic stand offs. Even the trimmer control uses a smaller acrylic rod within a larger acrylic tube/standoff. And the L-shaped piece directly to the right of the cannister, from which it is supported, is itself on long standoffs from the right end piece. There are 3 sets of 4 fine wires coming out of the crystal cannister, two go to the little board on the right, one goes to the larger board on the left (the output board). The crystal cannister was surrounded with white extruded foam of the same kind as a cheap picnic cooler. I removed some of the silver "fingers" around the crystal cannister area to remove the insulation. I don't know what the board on the right end does.. maybe temperature control? The board on the left end seems to be output buffer/filter. I don't think I am going to tear this down any further, and I also don't think I see any easy way for me to adjust the frequency electronically without ripping into the crystal cannister and I don't trust my ability to put it back together in working order. If you all have suggestions otherwise, fire away. Chris _______________________________________________ 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.
