I have a digital pbx I look after (ComDial) That has about 1000' aerial 25  
pair cable between buildings.  Each end has a gas tube protection and  
additional analog & digital protection.  The problem is RF and ac  noise.  I 
put am & 
fm chocks on, grounded spare pairs @ each end,  and am still getting 
intermittant problems on digital and analog  stations.  The factory has a lot 
of 
weilding equip. at far end, including  mig welders, which I remember years ago 
would 
play hacoc on an old  Executone Charter system.  Any ideas out there to 
clean-up this big  antenna.  (Problems amount to digital phones locking up and 
analog stations  going bad)
 
Thanks
 
Kenny


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