[time-nuts] oscillator choice question (ND100M)

[chris at yipyap.com]

sorry, revised with correct URL's.

chris at yipyap.com wrote:
> 
> 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.jpg  is right (rear)
> end of the component side.
> 
www.yipyap.com/radio_stuff/ND100M/Four.jpg is the left (front)
> end of the component side.
> 
www.yipyap.com/radio_stuff/ND100M/Two.jpg is a blurry closeup
> of the center from the trace side.
> 
www.yipyap.com/radio_stuff/ND100M/Three.jpg 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
> 
> 
> 
> 
> 
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