KX-T: RF & ac noise

2007-07-23 Thread DIALTONE1
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 g

Re: KX-T: RF & ac noise

2007-07-23 Thread Donald R. Resor
This may be a dumb question, but is the 1000 feet of 25 pair run inside a steel conduit? At 01:02 PM 7/23/2007, you wrote: >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 & digita

Re: KX-T: RF & ac noise

2007-07-23 Thread Donald R. Resor
This may be a dumb question, but is the 1000 feet of 25 pair run inside a steel conduit? At 01:02 PM 7/23/2007, you wrote: >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 & digita

Re: KX-T: RF & ac noise

2007-07-23 Thread David Lesher
Speaking on Deep Background, the Press Secretary whispered: > > 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 > p

Re: KX-T: RF & ac noise

2007-07-23 Thread Jim Schultz
Steel conduit in the air? I think he meant it was strung "aerially". Welding arcs are very rich in RF that covers a HUGE amount of radio spectrum at a rather high field strength. You are on the right track with using "chokes"...(I think you misspelled chocks). I don't think grounding the