[TowerTalk] AC/DC injection on CATV hardline

PY1NB - Felipe Ceglia felipeceglia2 at gmail.com
Tue Jan 14 19:27:39 EST 2014

Hello folks,

I need to inject AC or DC into a run of CATV hardline (.860)

I've been told by a CATV technician that  it isnt a good idea to inject DC
into it, he couldn't explain why. He mentioned seeing molten cables when
someone tried to do it.

I got a pair of AC injection boxes, but when measured on the VNA each of
them presents more than 35dB insertion loss on 1.5MHz...

Do you guys have any expertise on this issue? If AC is really needed, any
particular diagram? 60hz seems to be fairly close to 1.5MHz to isolate it
using a single capacitor as done with DC. Maybe a highpass filter should


Felipe Ceglia - PY1NB
PR1T team member /// Rio DX Group member /// Araucaria DX Group member
http://dxwatch.com /// http://reversebeacon.net /// http://riodxgroup.com

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