3 ms·
VHF may be desirable because it penetrates objects and buildings well, has dozens of km of range, and typically propagates line-of-sight instead of groundwave o
by temp-dude-87844 7y ago
VHF may be desirable because it penetrates objects and buildings well, has dozens of km of range, and typically propagates line-of-sight instead of groundwave or skywave.
But the VHF band is nearly full [1] of existing allocations for public and commercial interest, like FM radio (87.5 - 108 MHz), air navigation (108 - 137 MHz), Marine VHF (156 - 174 MHz), with broadcast television channels slotting on either side on a variety of frequencies. Here's a US allocation chart too [2]. The 144 - 146 MHz interval in question is reserved for amateur radio throughout the world, being one of the very few remaining slots in this band that has the same exact purpose around the globe. This universality makes it valuable, both for amateur radio, but presumably coveted by commercial interests as well.
If they can achieve a reallocation, the frequencies' existing users will be kicked out, giving them a nice and empty slot in the VHF band. Currently, operating on this band requires a license, and if it's reallocated, presumably not many licensed operators would infringe on the band in protest, as they could lose their license and be prosecuted for unauthorized transmissions.
[1] https://commons.wikimedia.org/wiki/File:VHF_Usage.svg https://commons.wikimedia.org/wiki/File:VHF_Usage.svg [2] https://commons.wikimedia.org/wiki/File:United_States_Frequency_Allocations_Chart_2016_-_The_Radio_Spectrum.pdf https://commons.wikimedia.org/wiki/File:United_States_Freque...
- askvictor 7y agoWhy not go after FM radio frequencies? Dab+ can replace them more efficiently, like dvb replaced analog tv. Yes, it will annoy drivers of old cars for a while. But there's a lot more bandwidth there: 20MHz compared to 2MHz for the VHF in question. And FM is a global range AFAIK
- Aloha 7y agoThere is 0 DAB deployment in the US