Yeah, in that case you're not going to have much drop. The only reason
I shoot for 27.4v is to match the float voltage on batteries - if you
don't have to deal with that, just set it to 26v, or so and you won't
need to worry about anything.
On Tue, May 15, 2018 at 10:20 AM, Josh Luthman
<[email protected] <mailto:[email protected]>> wrote:
Reason I ask is if at the bottom I believe it's 24v and the top
it's 24v. I'm using that heavy duty coax (inch and a half?) up
the tower for my DC. I think the center conductor was 8mm.
If you're doing say 27.4v at the bottom and 100' of two pair 24
gauge, it's more like 26.83v at the top. I'm not losing that ~0.6v.
I really don't want to fry anything and start replacing radios :(
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
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Suite 1337
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On Tue, May 15, 2018 at 11:15 AM, Forrest Christian (List Account)
<[email protected] <mailto:[email protected]>> wrote:
The UBNT stuff used to be a lot more sensitive than it is.
Anything modern should be fine up to 28V on the 24V radios.
On Tue, May 15, 2018 at 7:34 AM, Josh Luthman
<[email protected]
<mailto:[email protected]>> wrote:
Sweet! I'll crank up the power supply another volt. IIRC
Ubnt stuff dies at 26 or 27 volts, so you can see why I
aimed for right at 24v.
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
<https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g>
Suite 1337
<https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g>
Troy, OH 45373
<https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g>
On Sun, May 13, 2018 at 9:21 AM, Josh Baird
<[email protected] <mailto:[email protected]>> wrote:
Agreed. I expect your issues will go away if you
increase voltage. We run all ePMP @ 48VDC. It fixed
these random rebooting issues for us.
On Sun, May 13, 2018 at 6:37 AM, Forrest Christian
(List Account) <[email protected]
<mailto:[email protected]>> wrote:
22.93 is too low. Cambium says 23V is the
minimum into the radio. See
http://community.cambiumnetworks.com/t5/ePMP-Installation/ePMP-PoE-Powering-Primer/td-p/49944
<http://community.cambiumnetworks.com/t5/ePMP-Installation/ePMP-PoE-Powering-Primer/td-p/49944>
You need to subtract a bit of loss inside the
injector, and then a bit more for cabling. Plus
a bit more for everything else.
For verification, I took my bench ePMP and hooked
it up to my power supply - it doesn't even turn on
until 22.5V at the radio. I'm sure other copies
are probably higher or lower. And I'm sure it
changes with internal temperature of the radio.
One big difference between the PoE Injector and
the SyncInjector is that the syncinjector uses
semiconductor switches which generally have a bit
more voltage drop than a relay. The tradeoff is
that the semiconductor switches can switch far
more power than the relays can and can switch
quickly enough to do sync over power.
On Sat, May 12, 2018 at 10:26 PM, Josh Luthman
<[email protected]
<mailto:[email protected]>> wrote:
So we replaced all 8 surge cards. It's
getting 22.95 and 22.93 for the two boxes (to
the green terminal). Devices are still
rebooting...
Epmp never has problems with the same DC
supply through the green POE injector, forgot
to mention that.
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
<https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g>
Suite 1337
<https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g>
Troy, OH 45373
<https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g>
On Sun, May 6, 2018 at 8:14 PM, George Skorup
<[email protected]
<mailto:[email protected]>> wrote:
Funny story if you were using ePMP near
the beginning. Some of the first original
5GHz integrated radios had labels marked
56VDC. They were definitely NOT capable of
being powered from 48/56V. Somebody
screwed up.
Yeah. We've run Force180/200 survey setups
on a small 12V SLA too. It works, but
they're rated at 14 volts. Same with the
100 and 450 SMs. Still works. However, I
recall the regulator is very inefficient
down that low. Like the old 320 and 430
APs could be run on 24VDC, but you really
didn't want to do that, and
Motorola/Cambium said it was completely
unsupported.
On 5/6/2018 5:13 PM, Bill Prince wrote:
I had a portable 12V battery that I
would use for site surveys with the
old PMP100. I'm pretty sure they would
function in the 8-10V region.
I know nothing about the ePMP radios.
Trust George.
bp
<part15sbs{at}gmail{dot}com>
On 5/6/2018 2:33 PM, George Skorup wrote:
Original 5GHz integrated and
connectorized are 14-30VDC, -4/5
+7/8 only.
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