Question on splitting cable signals....

[Jim Yanik]

[e-mail] (Sasal Suzi) wrote in news: [e-mail]:

He was checking for EMI,electromagnetic interference,and it's required by Federal law.That's one of the main problems for cable companies,and they do get fined by the FCC for it.They weren't 'scanning",they drive around with a sensitive receiver with a directional antenna,that points in the direction EMI is coming from. Loose or corroded F-connectors can cause it,too.

One other thing,all amplifiers ADD noise to the signal in addition to boosting the level.The cable companies usually deliver to the home the lowest signal level practical to further reduce their EMI radiation.

[Jim Yanik]

"Joseph Meehan" wrote in news:ce0Jb.115698$ [e-mail]:

The amp could be a cheapo one,and acting as a noise generator.Or overdriving an input,or had a loose connection.

[Jim Yanik]

B a r r y B u r k e J r . wrote in news: [e-mail]:

BINGO,you have the correct answer.

[Jim Yanik]

"j j" wrote in news:EsYIb.11349$ [e-mail]:

A loose F connector (or an improperly installed one)can allow leakage,or a corroded connector;the corrosion acts like a diode,creating harmonics from the many signals on the cable.One of the cable channels may have the same,or be close to a frequency used by aircraft.

Tha amp itself could have problems,perhaps overdriving an internal stage enough to cause EMI radiation.

[Enuf]

cheap TV amps (including Gemini as the OP stated) were notorious for RFI at one time. I think they have been forced to provide a cleaner product now.

Enuf