interesting discovery

[jpjanze]

we have comcast here in the apartment. so i took a 75 ohm ground block and hooked it inline with the tv cable and grounded the rangemaster to it. result was anywhere in the building all over 3 floors and the basement car garage gets my signal is loud and clear. few feet from building it dies. my guess is anywhere in the surrounding buildings that cable goes gets a clear signal.

[Carl Blare]

That indeed is interesting. I have never before heard of exactly that sort of thing happening, so to me it’s a new experience in Part 15.

I would also wonder if perhaps your signal is following the cable to other buildings in the area without radiating much outdoors in the air.

I hope other, more experienced engineers comment on this in case there might be a down side.

[kc8gpd]

heres pics of my test setup..
https://www.facebook.com/media/set/?set=a.116611041781867.19078.100002989142408&type=1&l=a188b763a7

im still tweeking and experimenting before hooking up all the mixing board and other accessories

[Carl Blare]

Our town has a Science Center with all kinds of techy exhibits, but your system looks better.

[kc8gpd]

here is the studio setup
https://www.facebook.com/media/set/?set=a.116671691775802.19089.100002989142408&type=1&l=39d0955b6c

and most of my test gear

album 1
https://www.facebook.com/media/set/?set=a.100984093344562.1484.100002989142408&type=1&l=7bebe20569

album 2
https://www.facebook.com/media/set/?set=a.101166566659648.1864.100002989142408&type=1&l=1d945971d1

[RFB]

Not all different from loading the neutral on the power grid.

Operation in this manner also follows the 15.221/15.209 rules. At 100mW there should be no issue with interference.

Coverage area will vary, but not unheard of for an AM CC signal via the tv cable to cover a several block radius.

RFB

[Carl Blare]

Your studio and equipment is better than some licensed stations, kc8gpd

[kc8gpd]

had an engineer for a 50kW blowtorch tell me my equipment was better then what they had.

[Author]

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