Hi Phil.

A couple of things come to mind here.  First of all, most of the time this 
type of leakage should be two way.  I wonder what the area around 145.25 
looks like and how far out any noise on that frequency extends and at what 
strength?

Second, an apartment building brings with it some special problems because 
people are tightly compressed together, and it may be possible that there 
is no problem with the cable installation at all, but rather a front-end 
overload situation at the cable box.  This might be especially likely if 
the interference problem seems to be "one way."

As far as the FCC is concerned, they are probably dealing with an 
untintentional interference to a Part 15 device problem, and from the FCC's 
point of view, the Part 15 devices must accept whatever interference they 
get.  However, from the building management's point of view, I don't 
believe they are obliged to allow zamateur radio transmissions within their 
building because it is their building.  I think this would be treated 
similarly to deed and covenant restrictions which the FCC does not pre-empt.

Basically, probably shifting operations to a frequency that doesn't bother 
the cable was probably the prudent option, unless of course the hams in 
question intend to seek another residence, which given the stance of the 
building management, might not be a bad idea.

This type of interference is extremely prevealent in situations where hams 
are forced to use indoor antennas, thereby putting consumer electronics 
from neighboring apartments in the near field of the transmitting antenna.

I had a problem like this at my college dorm at S.u.  The guy whose 
television my Icom 2AT clobbered was right on the other side of the wall 
from me--there probably wasn't even one wavelenght between my transmitting 
antenna and his television set.  That's a real tough situation.

73, de Lou K2LKK



At 05:08 PM 12/7/2006 -0700, you wrote:
>I have some friends living in an apartment complex.  Three hams in that
>building are very active on 2 meters.  Several people in the building have
>complained they are hearing them on channel 18 and I assume that is cable
>channel eighteen.  they all cranked their radios down to 2.5 watts but the
>building management has threatened to evict them if they transmit any
>longer.  Yes, they have made all sorts of calls to the FCC and ARRL and
>others.  Their 2 meter club has helped them out by putting up a 450 remote
>base.  They gave them 450 handy talkies so they can transmit on 450 to the
>remote base several blocks away at someone's house and back into the 2 meter
>repeater.  So their problem is solved as far as that is concerned but I
>would think the cable company would have some responsibility.  I am trying
>to contact somebody here in Denver whose repeater was getting jammed by
>channel 18 and they got the FCC involved and the cable company fixed it but
>I just wondered if anybody had any ideas on this problem.
>
>Phil.
>
>
>K0NX
>The Zenith Tube
>www.RedWhiteAndBlue.org

Louis Kim Kline
A.R.S. K2LKK
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