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[RFI] RFI CATV Sub Band Interference

To: <rfi@contesting.com>
Subject: [RFI] RFI CATV Sub Band Interference
From: pringle50@comcast.net (J. Leon Pringle, Jr and Audrey S. Pringle)
Date: Mon, 01 Apr 2002 17:28:46 -0600
----- Original Message ----- 
From: J. Leon Pringle, Jr and Audrey S. Pringle 
To: djs@po.cwru.edu 
Sent: Monday, April 01, 2002 5:19 PM
Subject: CATV Sub Band Use

Reference your post on the RFI reflector.

CATV Systems use the sub bands in various ways.  Most often it is used for what 
is commonly referred to "as return signals or two way feed."  By utilizing 
these frequencies, there are at least 7 additional video channels in this range 
below the normal Channel 2 assignment.  Many cable systems that offer internet 
service utilize these frequencies for their outgoing (transmitting out) service.

The cable system still must keep these frequencies confined within their 
distribution and trunk coaxial cables to avoid interfering with other principal 
users of these frequencies.

Don't be surprised to find that the problem could very well be the internal 
drop cable serving your home or another near by as the drop cable is more 
likely to leak than the hard-line because of flexing action due to the wind and 
similar environmental factors, especially corroded F fittings or improper 

73 and hope this helps you.

J. Leon Pringle, Jr    W5NA

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