Indeed, one time I was visiting my Dad who lived in Osterville at the time and I was tuning in to hear Donna Halper on the Jordan Rich show. It was weaker than I expected.
Eli Polonsky said:Norm Rosen said:...WBZ was lucky enough to be allotted a 24 hour non directional pattern when they were available, whereas, the other Boston area 50K stations are unlistenable beyond 128 at night
WBZ is directional, nulled to the east. It doesn't come in as well as you would expect on Cape Cod.
Scott Fybush said:Eli Polonsky said:Norm Rosen said:...WBZ was lucky enough to be allotted a 24 hour non directional pattern when they were available, whereas, the other Boston area 50K stations are unlistenable beyond 128 at night
WBZ is directional, nulled to the east. It doesn't come in as well as you would expect on Cape Cod.
WBZ is directional by choice, one of two former I-A clear channels in that category.
The FCC licenses AM stations by transmitter power output (give or take a slight adjustment for inefficiency in a directional phasor), and as a result, not all "50 kW" signals are created equal. Put 50 kW of transmitter power into a highly-efficient 190-degree tower like WBZ and you get a greater field strength than you do by putting that same 50 kW of transmitter power into a shorter tower like those of WRKO or WXKS.
More to the point in this case: put that 50 kW into a non-directional tower and you get the same field strength in all directions. That's great if you're WABC and you have in-market population in all directions. That's not so great if you're WBZ and the vast majority of your market's population is concentrated in one direction. Add some directionality to the pattern and you're not just nulling the signal in a direction where there's mostly water. That power has to go somewhere else as a result, and the result is a significantly stronger signal over Boston than WBZ would have as a non-directional signal. Yes, the tradeoff is a weaker signal in Provincetown; it's well worth it.
(It didn't necessarily have to be that way: a Westinghouse plan in the 1950s to boost WBZ to 750 kW (!) would have moved the transmitter to Provincetown and would have barbecued the entire Cape with signal.)
Norm Rosen said:That would have been nice to have WBZ blast it's station from Provincetown toward Boston with 750K watts.
How many AM's are megawatted like that?
reelyreal said:Norm Rosen said:That would have been nice to have WBZ blast it's station from Provincetown toward Boston with 750K watts.
How many AM's are megawatted like that?
In North America, none. The only station to operate at 500kw was WLW in the 1930's. I believe it was the 60's when the FCC officially killed any hope of AM's operating with more than 50kw. Scott would know better than I do.
Scott Fybush said:WBZ is directional by choice, one of two former I-A clear channels in that category.
aerie said:Wikipedia (that bastion of truth and knowledge) claims that KNX also used a directional antenna for a while in the 60's but only during the daytime.