Continuous Band Coverag Question?

kc0vgj · #1 (**permalink**) 10-31-2009, 06:03 PM

Continuous Band Coverage Question? Why did the FCC Exclud UHF TV? Frequencies on scanners?

N_Jay · #2 (**permalink**) 10-31-2009, 06:09 PM

The only band excluded by the FCC is the cellular portion of the 800 MHz band.

kc0vgj · #3 (**permalink**) 10-31-2009, 06:49 PM

then why does my scanner the bcd396t skip 512mhz to 763mhz?

N_Jay · #4 (**permalink**) 10-31-2009, 07:19 PM

Quote:

Originally Posted by kc0vgj

then why does my scanner the bcd396t skip 512mhz to 763mhz?

Because Uniden designed it that way.

wlmr · #5 (**permalink**) 10-31-2009, 08:21 PM

Quote:

Originally Posted by N_Jay

Because Uniden designed it that way.

Just heard a Pa-dump-bump-CRASH from the drum section!

MarkWestin · #6 (**permalink**) 11-01-2009, 12:13 AM

The BR330T includes the 512mhz to 763mhz frequency range. In addition to the former analog UHF TV audio, there are quite a few wireless microphones that operate in this frequency range.

Mark

DaveNF2G · #7 (**permalink**) 11-01-2009, 02:12 PM

Most scanners have excluded the UHF TV band since the first ones were made. There are no crystals AFAIK for that band, and until the upper portion (channels 69-83 or thereabouts) of the UHF TV band were reallocated few if any scanners would tune there. (470 to 512 used to be TV channels, too, which is why it is called "T-Band.")

The FCC had nothing to do with it. Scanner manufacturers have to balance consumer demand (as they perceive it - not always accurately) for frequency coverage with the technical difficulty (read: expense) of building a scanner that will do the job adequately. There has been no "need" for scanners to cover most of the UHF TV band until now, so scanners generally have not been designed to tune there.

The newest scanners cover the band, although the boundaries and capabilities within the 700 MHz band are variable among models.

kc0vgj · #8 (**permalink**) 11-01-2009, 02:30 PM

thank you explaning to me this. The reason I asked is that in my manual it stated that cell and the T-band ar blocked and moddifing it will brake the law.

DaveNF2G · #9 (**permalink**) 11-02-2009, 07:44 PM

Quote:

Originally Posted by kc0vgj

thank you explaning to me this. The reason I asked is that in my manual it stated that cell and the T-band ar blocked and moddifing it will brake the law.

Those are two separate issues.

The T-band would not be "blocked." It would simply be missing from the scanner's available frequency coverage.

The cellular bands are blocked by law. The radio's circuitry might be capable of receiving signals in that range, but the manufacturer is not permitted to allow that to happen. Modifying the scanner to override or bypass this block is illegal.