[RFI] Common Mode RFI
Wed, 4 Dec 2002 17:59:48 -0800
> 1. Is it likely that common mode RF flowing on the outside of coaxial
> cable would radiate into domestic telephone systems and computer modems,
> causing RFI? How would one determine if this is the case (without buying
> common mode choke, first, and experimenting)?
I built a RF tester that checks for RF on cables. It uses a split bead in a
plastic case that opens and snaps shut. You put your cable across the bead
and close it A one turn transformer is made by having a wire go across the
bead and into the box where I use germanium diodes to rectify the RF for the
meter. QST has had a couple of construction projects about this type of
tester. It only gives a relative reading, but it is very useful.
I think Palomar has a tester like what I am talking about.