wrote in message
...
On Fri, 13 Jun 2008 13:31:10 +0200, "John Seager"
wrote:

Before tearing your hair out, disconnect, clean and reconnect any
junctions you can access. This could be as simple as the ground shield
losing it's connection inside that junction box, or a loose setscrew.

Thanks. I did try that a while back but might have overlooked the shield,
thinking (in my ignorance) that this was not a critical component. Will take
another look.

While searching, I came across this from Stowe who make a replacement
masthead unit - 4th column seems to contain some relevant numbers. Not sure
what they mean by "2Ø 2-6V + wind speed" but I guess it would make sense
for the voltage to vary between 2 and 6 volts with increasing wind speed.
J
Specifications:

Model
Dataline
Micro
AH
NMEA

For use with Dataline, X, Navigator, IS11 Micro Autohelm ST50 Cetrek,
KVH, etc
Accuracy ~+/- 2? ~+/- 5? ~+/- 2? ~+/- 2?
Power Supply 12V nominal (7-16V) 12V nominal (7-16V) 8V nominal
(7-16V) 7-16V
Current 50mA @ 7V 50mA @ 7V 50mA @ 7V 50mA @ 7V
Output Type 3Ø 0-12V
+ wind speed
1Ø 0-7V
+ wind speed
2Ø 2-6V
+ wind speed
NMEA 0183 10Hz
or NMEA 0183-HS