[time-nuts] Motorola KXN1132AA

Glenn Little WB4UIV glennmaillist at bellsouth.net
Sat Jan 24 22:25:26 EST 2009


I will try and locate a digital camera.

The oscillator is in a tin plated steel box.
The dimensions are 5.25"x3"x3".
On one 3x3 side, in the center, is a screw that hides an adjustment screw.
On the other 3x3 side is the BNC output connector and a ring of 
terminals about the diameter of a 9 pin tube.
There are 8 terminals. Two are for negative power and one is for 
positive power. The power source is 24VDC.
Also on this side is a screw in the upper right hand corner. This 
screw is soldered to the case.
On one of the 5.25x3 sides (the bottom) is four mounting studs. These 
are 6-32 and are at the corners of an imaginary 2"x4" rectangle 
centered on the 5.25x3 side.
The side that has the BNC connector and terminals is soldered into 
the rest of the case.
There are two dimples to two sides of the box to stop this piece from 
going too far into the box.

73
Glenn
WB4UIV




At 08:08 PM 1/24/2009, you wrote:
>Glenn
>
>Other leads may include an EFC input.
>
>As long as the oscillator frequency can be adjusted electronically
>(usually via EFC) it can be disciplined.
>If the oscillator lacks EFC then you may have to resort to using it in a
>DDS or equivalent so that the output frequency can be adjusted.
>The only drawbacks with a DDS are the spurs and elevated phase noise.
>If you use a DDS the control system output must be digital, however an
>EFC DAC isn't required.
>There are techniques available for canceling spurs and/or reducing their
>amplitudes significantly however these techniques add some complexity.
>
>Can you post an image of the oscillator?
>
>Bruce
>
>Glenn Little WB4UIV wrote:
> > The oscillator was bought as part of a scrapped Motorola base station.
> > I was told that it was a PURC.
> > The only leads attached to the oscillator are the power and the BNC
> > output connector.
> >
> > Would this oscillator be able to be disciplined?
> > What would its accuracy be as the basic oscillator?
> >
> > There was no GPS in the parts that I got.
> >
> > The oscillator is large enough to be a double oven OCXO.
> >
> > Thanks for any help
> > 73
> > Glenn
> > WB4UIV
> >
> >
> > At 06:34 PM 1/24/2009, you wrote:
> >
> >> If that came from a PURC, see if the GPS receiver is included. 
> It may not as
> >> they used one receiver per site and slaved all the HSO's to it.
> >> Or, there may be a 14.4 MHz oscillator on board.
> >> Hopefully the 5 MHz oscillator was not purloined !!
> >> There are also some jumpers that allow you to set the reference
> >> input frequency
> >> (I think, I am only recalling from memory the MSF5000 HSO, which 
> is similar, I
> >> think).
> >>
> >> 73, Dick, W1KSZ
> >>
> >> -----Original Message-----
> >>
> >>> From: Glenn Little WB4UIV <glennmaillist at bellsouth.net>
> >>> Sent: Jan 24, 2009 4:42 PM
> >>> To: Time-Nuts list <time-nuts at febo.com>
> >>> Subject: [time-nuts] Motorola KXN1132AA
> >>>
> >>> Recently there was a post about oscillator stability and I thing
> >>> drift over time.
> >>>
> >>> Was the large Motorola oscillator the one in the subject line?
> >>>
> >>> Further markings on the oscillator are source code 9896, Cust No
> >>>
> >> 48R83851N02.
> >>
> >>> This is a 5 MHz operating frequency oscillator.
> >>>
> >>> There are 8 lugs to interface the oscillator. Pin 4 is plus and pins
> >>> 2 and 3 are negative.
> >>> I think that this oscillator is an OCXO and works on 24VDC.
> >>>
> >>> Can this oscillator be disciplined?
> >>>
> >>> What are the other pins for?
> >>> What is the oscillator accuracy?
> >>>
> >>> Thanks
> >>> 73
> >>> Glenn
> >>> WB4UIV
> >>>
> >>>
> >>>
> >>>
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> >
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