They are negative ground....the - side is connected to the shield of the
antenna.

JH
----- Original Message -----
From: "Bill Clark" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, August 03, 2003 5:15 PM
Subject: [smartBridges] Power and other grounds in aPPO


> sB Support,
>
> I intend to power several aPPOs (and backhaul gear) from a single 18VDC
> UPS and am looking for problems such as power shorts and up-tower ground
> loops.
>
> What is the relation between the aPPO's power pairs and any internal
> grounds, mechanical grounds, and the coax connector?
>
> Bill Clark
>
>
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