I have four MV89As. Two are excellent and run at a case temp around
43C/110F. One tends to jump frequency when you move it, it also sits
around 43C/110F though. The final one has a broken temp controller.
Mounted inside a large block of expanded polstyrene insulation, it
reached 92C/198F before I realised something was not right.
The best MV89A has been running continuously for 18 months and has
drifted LF by 1.2ppb in that time, compared with two GPSDOs and the
GB3MHZ GPS-locked beacon on 1296.830MHz
The two bad ones were cheap and were still soldered to bits of hacksawed
PCB.
Neil
On 19/11/2017 22:56, Angus wrote:
On Sun, 19 Nov 2017 16:10:54 -0500, you wrote:
The MV89 is a beast of an OCXO and uses more power at warm-up than any
other
I know of. But it is spec'ed ~1W for steady state. Which means the
outside of the OCXO should be about hand-warm. If it's too hot, then
the heater circuit is probably broken and running at full-throttle.
If so, I think something is not OK with my MV89. It is probably 110
degrees or so.
They do run hot, so if that's 110 DegF and not DegC it's OK (depending
on ambient...) The data sheet says 4.2W at 25 DegC.
BTW if anyone is thinking of visiting www.morion.com.ru this might not
be a good day - when I tried earlier the AV claimed it was infected
and the script blocker went nuts, so they did seem to have got
infected by something.
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