Do you have a TV antenna poll up there on the roof?
You could mount the unit on that. You'll need a ubnt mounting arm as well so you can angle the unit in the right direction. These things don't like being off direction by more than 15 degrees.
D
Promote New Zealand - Get yourself a .kiwi.nz domain name!!!
DonGould: Do you have a TV antenna poll up there on the roof?
You could mount the unit on that. You'll need a ubnt mounting arm as well so you can angle the unit in the right direction. These things don't like being off direction by more than 15 degrees.
D
Not entirely sure tbh. Being three storey's high, it's not the easiest roof to look up on top of. Because its an apartment complex, I think they may have a shared antenna, not sure where it is though.
now you've definitely got me worried by saying that (about the angle!)
sbiddle: Why are you bothering with shielded cable? It's not going to give any benefit unless you're in a high thunderstorm area.
It is not about thunderstorms as such, anything that gets hit by lightning will die, it is about the difference in earth (GND) potential as a lightning strike propagates through the ground. You have 2 items far apart with an earth wire between them so for a brief moment the earth at one unit will be at a higher voltage than the earth at the other unit yet they are electrically connected.
There is a compliance test for this, any data/signal cable over 3m outdoors (10m indoors?) must pass this test. From memory it is a 1kV common mode surge with 8us rise time and 40us fall time, for power ports it is 2kV differential mode. The characteristic impedance of the surge tester is 42 Ohm so you have a potential peak current of 24A and 48A. Very few products pass this test first time.
Use shielded cable and connect the shield at both ends with shielded connectors.
sbiddle: Why are you bothering with shielded cable? It's not going to give any benefit unless you're in a high thunderstorm area.
... You have 2 items far apart with an earth wire between them so for a brief moment the earth at one unit will be at a higher voltage than the earth at the other unit yet they are electrically connected. ... Use shielded cable and connect the shield at both ends with shielded connectors.
Isn't this the very reason they say not to ground the cable shield at both ends?
With audio circuits, you commonly get ground loops, resulting in hum injection into microphone circuits when the shield is grounded at both ends. With the Airspan 2.3GHz equipment I have just replaced, they explicitly said NOT to ground the shield at the antenna end, only at the end inside the building.
Maybe I'm barking up the wrong tree here, but it seems to me that the last thing you want to do is have an electrical connection between two separate ground points under lightning strike conditions. Having just one end grounded, with a MOV spike catcher from each data line to the shield would seem to be a better idea.
Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly
to your computer or smartphone by using a feed reader.
Trusted
