Does anyone know of a high power 28V or 26V POE injector?
I have a long cable run for which 24V is not enough and 30V is too much - I can't find anything in between.
RB433AH. I know 24V is not enough because when both radio cards in the routerboard transmit at maximum power, it reboots. When only one transmits, or both transmit at low power, everything is ok.What RB you use? How you know that 24V PSU is not enough? How about power via Jack over 2x1,5mm2 power cable?
I'll give it a try if I can't find anything else and can manage to fit the splitter in the enclosure.I have never used them but they sound like a good idea. If 12 watts is enough for your application.
You have a power problem. Power at the top is what you need here. You don't have a voltage problem since RB433AH will run just fine as low as 12vdc. The voltage drop over long DC cable runs reduces the power at the top. You didn't say which 24vdc POE device you had used. If it is the Pac Wireless POE-24i or the Mikrotik 18POW, they put out 19 watts at the bottom (24vdc x .8amp=19watts). Assume a 4 volt drop over a long run and the power at the top is reduced to 16 watts. (20vdc x .8amp=16watts)RB433AH. I know 24V is not enough because when both radio cards in the routerboard transmit at maximum power, it reboots. When only one transmits, or both transmit at low power, everything is ok.What RB you use? How you know that 24V PSU is not enough? How about power via Jack over 2x1,5mm2 power cable?
I have to use POE, I can't replace or add any cables.
12 watts is only enough power for a single high power radio card and a RouterBoard so it won't fix your problem.I'll give it a try if I can't find anything else and can manage to fit the splitter in the enclosure.I have never used them but they sound like a good idea. If 12 watts is enough for your application.
Thanks for the idea.
maybe the quality of the cable is not so good?!
Besides, it is a good cable, but it's long.I have to use POE, I can't replace or add any cables.
The RB433AH is reporting 19.7 V under light load.how many volts do you end up with at the other end when using the 24v PoE adapter? Test it while it's running ...
All the small voltage regulators I can find that output 12V or 24V, take only up to 35V as input.You can use a 48-60v Power Supply with a passive PEO, and build your own DC-DC converter to regulate at 12 or 24 volt.
The RB433AH should keep running all the way down to 10vdc. I doubt that the increased load is causing an additional voltage drop of 9.7 volts. Perhaps the jitter of the voltage is causing crashes. Have you tried a large capacitor across the the power lines and close to the RouterBoard to stabilize the voltage?The RB433AH is reporting 19.7 V under light load.how many volts do you end up with at the other end when using the 24v PoE adapter? Test it while it's running ...