Topic: Anemometer - Frozen at 5° N (mostly?)

[SpartanWX]

Greetings all,
Looks like there is a spate of anemometer anomalies lately.  A week or so ago my wireless Davis VP2 with wired anemometer (replaced 6 months ago due to failed reed switch) has frozen at 5°.  The odd thing is that once every 20 or so readings it will move from there, but only to 9° or 360°, and only for a moment.

So far I have checked the splices which were clean, dry, and in excellent visual condition, checked and clean the connection in the ISS, and reset both the console and ISS.

It is weird to me because it is not a dead fault.  My logical next step is to redo the splice, which is a minor pain in the ass. Short of that fixing it, I presume it's a hardware defect. 

Is there anything I could be missing?

The wind vane is spinning freely.  And I'm confident it's not the set screw (even though I have not checked it) due to the fact the it sits pretty stable at 5° with intermittent forays to 9° or 360°.

[SpartanWX]

Here's a picture of when the fault occurred originally 2 weeks ago:
 [ You are not allowed to view attachments ]

And another showing a weird period where it went up to 24° for a couple of hours before falling back down to 5°:
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[miraculon]

Please see this thread: http://www.wxforum.net/index.php?topic=36402

Since you have a wireless VP2, it tends to point to the anemometer cable. (the wired VP2 had an unusual issue related to ground or common-mode)

In your case, please look at this section:

http://www.wxforum.net/index.php?topic=36402.msg373624#msg373624

This comes from http://www.lexingtonwx.com/anemometer/

Wiring errors:
yellow wire open causes a north indication
green wire open causes a north indication
red wire open causes a north indication and prevents wind speed from being indicated
black wire open prevents wind speed to be indicated
yellow to green shorted causes a north indication
yellow to red shorted causes a north indication
green to red shorted causes a north indication
black to yellow shorted, wind speed zero
black to green shorted, wind speed zero and direction erratic
black to red shorted, wind speed zero, intermittent short causes wind speed error

Greg H.

[johnd]

No wireless repeater involved is there? (Unlikely I know, but a repeater can cause this sort of symptom.)