Motorola OCXO Spec's?

[Leland C. Scott]

I have a Motorola "High Stability Oscillator"
module. It is marked model K1052A ASP06, and S/N
401033. There are three terminals on the top face
of the case marked E1, E2, and E3. The module is
about 4.5 inches long by 1.5 inches wide by 2
inches tall. The crystal in side the oven chamber,
in a glass envelope, is marked 3.0000 MHz.


|-------------------------------------------------
--------------|
| (M) MOTOROLA
| <- Coarse freq adjust on side
| High Stability Oscillator
|
|
E1 E2 E3 |
| Model K1052A ASP06 () ()
() |
|
| <- Fine freq adjust on side
| Serial 401033
|
|-------------------------------------------------
--------------|

The "()" are feed-through wire connectors.

So far all I have figured out is that E1 is the 3
MHz output, E2 is the oscillator supply, and E3 is
the oven controller supply. The module when I
found it at the flea-market had E2 and E3
connected together.

When I powered up the module I get a 3 MHz sine
wave output on E1 and the module does not draw any
significant current until the voltage supply to E2
and E3 exceeds 15 VDC. At 18 VDC on E2 and E3 the
module draws about 125 to 150 ma and I can the see
the frequency of the oscillator start to drop as
the module heats up. The power in to the module at
this point would be about 2 watts which is similar
to what the HP-10811 OXCO draws, which I do have
data on. I get about 1.5 Vpk sinewave output on E1
at 3 MHz at the above supply voltage open circuit.
The course and fine frequency adjustments seem to
work once the module heats up for a while too.

Right now I have no idea if the module is working
correctly or not. Without any specifications or
other data I can't tell if the oven controller is
working right, what voltages should I be running
the module at etc. I'm assuming it came out of an
old Motorola radio test set or some kind of
Motorola two-way radio system that required high
frequency stability. There is a small chance it
came out of some old Motorola manufactured
military equipment judging by the gay paint on the
Aluminum two part case. When I contacted Motorola
they couldn't identify the module, it wasn't in
their database! Does anybody have any data on this
module they would like to share?


--
Leland C. Scott
KC8LDO

ARRL Member
NCI Member

Charter member of the
Lawrence Technological University
Wireless Society W8LTU

 

[ddwyer]

I have a Motorola "High Stability Oscillator"
module. It is marked model K1052A ASP06, and S/N
401033. There are three terminals on the top face
of the case marked E1, E2, and E3. The module is
about 4.5 inches long by 1.5 inches wide by 2
inches tall. The crystal in side the oven chamber,
in a glass envelope, is marked 3.0000 MHz.


|-------------------------------------------------
--------------|
| (M) MOTOROLA
| <- Coarse freq adjust on side
| High Stability Oscillator
|
|
E1 E2 E3 |
| Model K1052A ASP06 () ()
() |
|
| <- Fine freq adjust on side
| Serial 401033
|
|-------------------------------------------------
--------------|

The "()" are feed-through wire connectors.

So far all I have figured out is that E1 is the 3
MHz output, E2 is the oscillator supply, and E3 is
the oven controller supply. The module when I
found it at the flea-market had E2 and E3
connected together.

When I powered up the module I get a 3 MHz sine
wave output on E1 and the module does not draw any
significant current until the voltage supply to E2
and E3 exceeds 15 VDC. At 18 VDC on E2 and E3 the
module draws about 125 to 150 ma and I can the see
the frequency of the oscillator start to drop as
the module heats up. The power in to the module at
this point would be about 2 watts which is similar
to what the HP-10811 OXCO draws, which I do have
data on. I get about 1.5 Vpk sinewave output on E1
at 3 MHz at the above supply voltage open circuit.
The course and fine frequency adjustments seem to
work once the module heats up for a while too.

Right now I have no idea if the module is working
correctly or not. Without any specifications or
other data I can't tell if the oven controller is
working right, what voltages should I be running
the module at etc. I'm assuming it came out of an
old Motorola radio test set or some kind of
Motorola two-way radio system that required high
frequency stability. There is a small chance it
came out of some old Motorola manufactured
military equipment judging by the gay paint on the
Aluminum two part case. When I contacted Motorola
they couldn't identify the module, it wasn't in
their database! Does anybody have any data on this
module they would like to share?


--
Leland C. Scott
KC8LDO

ARRL Member
NCI Member

Charter member of the
Lawrence Technological University
Wireless Society W8LTU

Probably working ok did u have to unsolder lid to find crystal?
Generally for better than 1ppe7 stability the crystal and maintaining
circuit must be temperature controlled.
Will the gay paint make me cheerful for alter my life style?

 

[Leland C. Scott]

Probably working ok did u have to unsolder lid to find crystal?
Generally for better than 1ppe7 stability the crystal and maintaining
circuit must be temperature controlled.
Will the gay paint make me cheerful for alter my

life style?

In fact no I didn't have to unsolder anything. The
whole oscillator is built
in a two part cast Aluminum case held together
with a bunch of screws. The two case sections have
a rubber gasket to seal out liquids. The section
where the crystal is located is made out of copper
surrounded by a stiff foam filling. The top half
of the case also has a section made out of copper
that "just" fits inside of the bottom section like
two pieces of telescoping pipe.


--
Leland C. Scott
KC8LDO

ARRL Member
NCI Member

Charter member of the
Lawrence Technological University
Wireless Society W8LTU