Originally Posted by retiredengineer
I posted a recent comment stating your bad reception of WWOR is probably multipath from the 1WTC. ...
I was told that the problem was "probably" my treetops.
I think I have these figures correct:
7 26.9 kW ERP @ RF 7
11 7.5 kW ERP @ RF 11
13 9.3 kW ERP @ RF 13
2 213 kW @ RF 33
4 200.2 kW @ RF 28
9 170 kW @ RF 38
5 247.5 kW @ RF 44
Since you're a retired engineer (presumably in this area of expertise) perhaps you could tell me how each of those "power verses RF" figures translates to "effective reception" at my location. I'm guessing that there is a relatively simple formula to calculate something like that. I think
I know that you need more power at higher RFs to get the same "effective reception" at a particular distant location. (I have no idea what the correct term is, so I'm using "effective reception").
Thus you see that WABC Ch 7 @ RF 7 is broadcasting at 26.9 kW while WNYW Ch 5 @ RF 44 is broadcasting at 247.5 kW.
What I'm seeing is adequate reception of all of the above channels except for channels 5 and 9. If 1WTC is causing multipath which is impacting my reception of 5 and 9, why is it not also impacting my reception of channels 2 and 4?
Is it because they have a more powerful "effective reception"? That is, are they broadcasting at a higher "power vs. RF" ratio?
Yea yea, I know that different RFs are affected differently vis-a-vis any 1WTC multipath effect, blah blah blah.
But then there's also the fact that I had very solid reception of ch 9 (at good strength) on both April 10 and April 23, then virtually no reception of it on May 15. Do you really think that the situation at 1WTC changed enough during that time span to cause the effect that you say is "probably" the cause of my absolute inability to even lock in ch 9 now?
And also the fact that LenL is seeing a rather dramatic reduction in ch 9's signal strength at his location? While 1WTC is likely more of less in my LOS with the ESB, it's not at all in his LOS. I'm not saying that the reflective effect of 1WTC can't have any
effect on his reception. But I am saying that the reduction he's seeing seems out of place with any effect I'd expect to see, given his location and LOS.
As I say, I was told (by more than one "expert") that the problem was probably my treetops. Since those did probably change significantly during the relevant time frame (they "leafed out" significantly during that time frame), I cut them down and thus eliminated them from the equation.
That had no effect whatsoever.
The fact is that neither you nor I have any idea what's going on with channels 5 and 9. I can only go by what I'm told. I'm told that nothing has changed over there since April 23.
I don't buy it. I don't say I'm being lied to, but I don't buy the idea that nothing has changed with ch 9 since April 23. The dramatic loss of signal I'm seeing here has to be accounted for. I think something
has changed over there. Maybe they just aren't yet aware of it?
Perhaps you're right, but I seriously doubt it. It just doesn't add up in my mind that whatever change may have occurred to 1WTC in three weeks' time would completely knock out my ch 9 reception and leave my reception of channels 2 and 4 virtually unaffected.
The only way I'll ever know for sure is if I get reception again before they go to full power of 355 kW.
What's your feeling about the effect of 1WTC on my reception when ch 9 does go to full power? Will that likely improve my reception or will it just give me worse multipath?
Since ch 2 @ RF 33 is presently broadcasting at 213 kW and is a very strong station for me, I'd expect ch 9 @ RF 38 to be pretty darn strong @ 355 kW.