The second harmonic is -36 dBm, the third 43, and the 10 MHz signal is
consistently around 7.6, so I think I am good to go.
This is a nice little unit for the money.
Thanks also for the various mounting suggestions. I may decide to mount
the MV89 on stand-offs on the base of the old Ovenaire OCXO. That unit
uses a loctal tube socket arrangement and reusing the base would retain
the plug-in approach to facilitate future replacement. If I wanted to
get really creative, I could probably figure out a way to mount the MV89
inside the old enclosure and to mount the trimpot so that it can be
adjusted through the original access hole in the top of the can.
However, that may be too much work for something that will never be seen
once the covers are on the 5110.
Fred
On 5/17/2013 5:44 PM, Bob Camp wrote:
Hi
If you have about 7 dbm and the second harmonic is down > 20 db I'd say your
unit is ok and move on.
Bob
On May 17, 2013, at 8:09 PM, Frederick Bray <[email protected]> wrote:
Hi Bob,
Yes, I did notice the prior thread about this. At the moment, I have been
looking at it using the spectrum analyzer function of my HP 8935. With the
reference level set to 20 dBm, I am getting a reading that varies from 6.99 to
7.37. I am trying to figure out whether this is normal based on the prior
comments on this issue.
I am going to see whether the signal level is adequate to drive the Cushman
5110. If so, the MV89 will become the new reference for that unit. At
present, it looks like the MV89 is within 1 Hz even without the application of
the reference voltage. Fine tuning will have to await a trip to the local
parts store to get a multi-turn pot.
Fred
On 5/17/2013 4:06 PM, Bob Camp wrote:
Hi
The big question is weather yours has the "capacitor of death" problem or not.
If it has the bum capacitor(s) in it, you will need to pop it open and replace the cap. I
would check things out before moving forward.
Bob
On May 17, 2013, at 4:19 PM, Frederick Bray <[email protected]> wrote:
I just received my first Morion MV89A. It came attached to a piece of the
original PC board.
I wonder how others have mounted theirs. One option seems to be to get a piece
perf board (perhaps with solder pads). Another might be to leave it on the
original PC board since that seems to have a nice ground plane and enough of
the board remaining around the edges to mount the whole thing on stand-offs. I
could remove the dozen or so capacitors and resistors on the original board.
I am thinking of using at least one of these in an existing piece of equipment,
so something simple is desirable.
Thanks for any suggestions.
Fred Bray
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