Hi Mark,Mark19 wrote:The spare transmitter and console are 433.9 MHz, so a different frequency from the main station so they don't clash.?
That's not necessarily the case, the "434 MHz band" is a "time shared" band, the transmitters generally (are required to) broadcast for very short periods, typically 100ms each 48 seconds for the Fine Offset branded versions, so many can use the same frequency.
Most systems use an "address" (perhaps better described as a "signature") within the transmitted message, so that the receiver can identify if it is receiving the "correct" data. However, the Fine Offsets appear to (mainly) identify the message only by it's "position in time", i.e. exactly 48 seconds (or an integer multiple) after a previous message. Thus the recommendation, when replacing batteries, to bring the transmitter close to the Console and insert the batteries in both units at nearly the same time.
So you shouldn't need to worry even if your spare transmitter (or a replacement) also uses 434MHz. Generally, the only other "legal" UK frequencies* are in the 868 MHz band, used by a few wireless systems such as the Clas Ohlson FO versions. (*excepting the rather congested 2.4 GHz band used by WiFi and Bluetooth, etc.)
@Charlie/Werk_AG: I eventually Googled some details about the Ventus/Auriol stations, but sadly no technical details. However, it looks as if the wind sensor has a mount which might be used on a "wall" as well as a mast. So maybe the "calibration" is a design decision to permit some freedom in mounting direction. Perhaps it just "counts" clockwise and anticlockwise "ticks" (pulses) from the reference position, or maybe it introduces a correction factor onto its internal direction sensor (magnetic?).
Cheers, Alan.