Re: Which is it, RG59 or RG6?

On Sun, 06 Dec 2009 23:11:22 -0500, "Michael A. Terrell"
<mike.terrell@xxxxxxxxxxxxx> wrote:

Ingression is external signals getting into the CATV plant. You are
describing radiation' where the signal is lost to being radiated from
the outer conductor, due to poor connections. It is monitored on a
continuous basis on most cable systems using 'Sniffer' or other brands
of monitoring equipment. While the signal is on the video carrier
frequency, it is FM modulated with annoying audio to make it easy to
identify.

Well, the leak or ingress goes both ways. While ingress from ham,
commercial, and broadcast radio xmitters are irritating, the
regulatory requirement is to prevent cable leakage from interfering
with public safety, aircraft, and of course, OTA broadcast. Lots of
nice toys to measure this leakage:
<http://www.trilithic.com/Broadband%20Instruments>

Personally, I prefer visual inspection, a TDR (time domain
reflectometer), signal level measurements, or just a pre-emptive
replacement.

Those are OK if you can shut a system down for repairs. Poor
connections in the trunkline can be detected by reading the voltage drop
between the coax and the amplifier housing, splice block or any other
splice in any powered cable. 60 volts modified sine wave AC @ 30 amps
from a CVT doesn't tolerate much resistance without causing hum
modulation or burning up a connector.

Ummm... the OP is trying to troubleshoot his home installation, not
the trunk line (or cable drop). I think it's a safe bet that he can
unplug his spaghetti without difficulties.


--
Jeff Liebermann jeffl@xxxxxxxxxx
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
.

Relevant Pages

  • Re: Which is it, RG59 or RG6?
    ... describing radiation' where the signal is lost to being radiated from ... the outer conductor, due to poor connections. ... of monitoring equipment. ... The idiot manager of one system ordered the wrong midband modulator ...
    (sci.electronics.repair)
  • Re: Bypass School And Work Filters www.classgetter.com
    ... I have seen connections from. ... It took me under a minute to find software I (as an admin) could install on users PCs to monitor all of the URLs visited and even tools that allow monitoring page content. ... These tools integrate in to the browser and monitor the browser rather than the network connection, so they are monitoring before outbound data is encrypted and after inbound data in decrypted, so it matters not whether the browsing is through an encrypted tunnel. ...
    (comp.security.firewalls)
  • Re: Lan Wifi Network
    ... Like the bandwith each ... >computer uses and the lenght of time of connections? ... we need to know *WHAT* you are monitoring. ... you're unspecified network devices might not have SNMP. ...
    (alt.internet.wireless)
  • Re: monitoring connections to my server/workstation
    ... The above message is provided "AS-IS" with no warranties, and confers no ... rights. ... > i would like trace or monitoring the connections to my Workstation / ... > Exist a software who monitoring a connection to my share folder or logon ...
    (microsoft.public.security)
  • Re: monitoring specific connections
    ... :on our network that will allow for monitoring these connections. ... :heard netflow can do this, I just wanted to get more feedback. ...
    (comp.dcom.sys.cisco)