Originally Posted by
socalslowguy
I noticed some loss of signal earlier in the year so I replaced the batteries in the display unit and the two sensors in February. I know from prior experience with a Vetta v100 that fresh batteries are important for wireless computers. Things were ok until a month ago I started to see loss of signal again. On one ride the speed didn't register for the first 30 minutes and on another it cut out for several miles in the middle of a ride and then suddenly worked again. I also had a ride where the cadence stopped working halfway through. I would try to force a re-synch by removing the display unit from the cradle and reinstalling it but no luck.
I replaced all three batteries again and the system worked flawless on both my Saturday and Sunday rides. I would expect that the batteries would last longer than 2 months. Or is there something else I should be doing if I'm experiencing signal loss?
The Sigma Rox 9.0 has a finicky personality that requires lots of pampering. With its triple wireless STS architecture, much can go awry. I nearly always see a "Cadence transmitter weak/soon empty" caution on my system, but after burning through several batteries I realized that the message is bogus.
When speed, heartrate, or cadence zero out, something has interfered with the signal. Aside from changing batteries, also try to reduce transmitter distance by placing magnets/sensors closer to the computer. Some regulated P7 bike lights can also block signal transmission as current is boosted to maintain wattage with declining light voltage.
Other indicators of a weak main battery: backlight inop, erratic flashing display, and nearly silent heart rate zone alarm. Weak heart rate strap battery is indicated by unstable heart rate indications as well as a weak zone alarm.
The battery status function of the Sigma Data Center software does not seem to work correctly. Better to use tell tale signs to determine when to change batteries.
Despite all these comments, I too am not really sure why the batteries don't last a year as advertised.