We share the 72 MHz band. Those frequencies are approved for use by FCC. <ttp://www.fcc.gov/oet/spectrum/table/fcctable.pdf> Go to page 186. NG-49
At 12:24 PM 6/10/2004, Doug McLaren wrote:
On Thu, Jun 10, 2004 at 03:35:20PM +0000, [EMAIL PROTECTED] wrote:
| A new cell tower is going to be placed at the end of our field, my | guess is that it is not a problem because of the frequency range the | cell phones work at but just checking if one of you is a technical | expert on the subject.
Well, most cell phones work far away from the 72 mhz band that most of us use. However, there is the possiblity of a very strong signal desensing your receiver so that it can't pick up your transmitter.
(A bit more on desense is here -- http://users3.ev1.net/~medcalf/ztx/desense.html.)
It's also possible that the tower won't just do cell phones but pagers as well. Here in Austin Texas, there are pretty strong and intermittent data transmissions at 72.660 mhz, 72.860 mhz ad 72.960 mhz, detectable all over town. I don't know what the source is, but it's presumably pager transmissions. If I get ambitious, I may try to make a 72 mhz band Yagi antenna and see if I can determine exactly where the signals are coming from, but I've got enough projects already so I don't know if I'll ever do that.
In any event, if there is a transmitter on that tower that works in the 72 mhz band, it'll almost certainly make the use of the channels adjacent to it's frequency very dangerous at best, and it would most likely reduce the range of any radios not that close to it's specific frequencies. If it only does stuff at cell phone frequencies, then you won't have nearly as much to worry about, but there is still the possibility of it causing problems for planes that get too close to it. (Of course, flying *into* it's bad too.)
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