Re: 3rd adjacents
RMarino said:
If 3rd adjacents are such a problem, how does this area get away with 100kw signals at 102.5, 102.9, and 103.3? I know their transmitters are scattered around different parts of the metro, but they still seem awful close.
102.5 and 102.9 are 82km apart.
I'm not sure how they got away with 102.9 and 103.3, which are only 33km apart. My guess is that they were already short-spaced when the current spacing rules were adopted in 1964. (the Broadcasting Yearbook says both stations went on the air in 1962, and the separation between WKDF's current transmitter site and that of WBIA-88.3, the only FM currently licensed to Shelbyville, is 71km. I don't know where either station's transmitter was in 1964.) The rule on this is kinda difficult to read but from what Scott Fybush has told me there is essentially no limit to how close pre-1964 grandfathered short-spaced 2nd or 3rd adjacents can move. Of course, WNTC doesn't qualify for a pre-1964 short-spacing.
Jetfli: sorry, sometimes my sarcasm filter doesn't work very well<grin>! I rarely go anywhere where one can hear WRFN so I don't really have much of a handle on their attitude towards things...
...as HD receivers develop, the increased receiver sensitivity is going to allow us to better hear more stations. By that they mean more exisiting stations, as they are expecting far less bleed in reception, so that range of reception would seemingly improve somewhat.
Ah. I'd imagine the selectivity of less-expensive HD receivers will indeed be a considerable improvement on bottom-end existing receivers like clock radios, boom boxes, and "walkmen". I've got a cheap auto-scanning "earphone radio" that only gets WPLN, WSM-FM, and WKDF; if an HD version worked at all I'm sure it'd get all the Nashville-transmitter 100kw stations.
(most)Car radios and home stereos are already pretty good. The other side of this coin is that interference from the HD sidebands (which spill into adjacent channels) will cause an *increase* in bleed on better receivers. At my location in Pleasant View, I expect full deployment of HD on all Middle Tennessee stations would wipe Fisk's WFSK 88.1 off the dial and leave Austin Peay's WAPX, 92Q, Lightning 100, and Hopkinsville's 100.3 all fairly noisy. This on the car radio and other good quality sets.
On AM, it's acknowledged (by the industry and FCC) that nighttime HD requires eliminating interference protection for skywave signals - thus, nighttime reception of existing stations like WBBM, WHAS, and WWL would potentially go away.