Hello Guys,
We installed two boxes of rb435G on a radio tower we use 12V 10A power adapters with 12V cooling fans. we used cat7 sftp cables (10 meters lenght) between nodes and switch with gigabit poe injectors.
When we boot up devices i try to test bw with built in tool total throughput was spiky unstable and unexpectedly low (30 mbit up 10 mbit down). I suspect it was a frequency or fresnel issue, i triple check everything. While i was checking my configuration, i noticed health monitor shows 9V DC with 7.4 Watt power consumption.
Day after we take a 24V 2.5 Amp adapter and climbled the tower.
First we increase output voltages of adapter to max (voltage increased 12.5V), throughput almost dubled after, we tried to give power directly to board this would increased voltage to 13.7V throughput increased futher and became more stable then, we decided to use 24V adapter. We get 90-80Mbit upload 50Mbit download we remove fans and tried 12V adapter with max power. board received 15V test was little slower but almost same 80Mbit up 60-45Mbit down and stable.
Sake of a beter understanding, i repeat tests and monitored health monitor; in the begining, consumption was 7.4 Watt "with bandwith test running" with max power and direct connection consumption increased to 14 watts, but it reduced 9.4 watts when we remove fans.
Any ideas why is this happening with 120Watt PSU?
24V 60Watt PSU is far more better i think mikrotik does not work well under 14V input voltage if you are using high power cards and active cooling.
So i am curious why is that mikrotik recomends 12V PSU with 12V fans in 435G's PDF
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