Re:The Backbone of VHF Amateur Radio May Be Under Threat
by moftz on Tuesday July 02, 2019 @12:32PM
(#20336738)
Why would you want to try to pump video over VHF? You have line of sight to everyone when you are in an airplane. Use a higher frequency band that allows for much more bandwidth and therefore higher data speeds. The little 1.2GHz video transmitters can easily reach 10km. That is cruising altitude for a commercial airliner. Having the proper license would get you even greater distance with a higher transmit power. Have the drone/UAV transmit ADS-B data and use GPS position to point a high-gain directional antenna at it, that should get you even more bandwidth.
Re:The Backbone of VHF Amateur Radio May Be Under Threat
by kawfey on Tuesday July 02, 2019 @12:59PM
(#20337037)
This, to me, is why this request is so unusual. This is much more suited for spread spectrum, secure, short wavelength (smaller antennas) and the like, and its surprising that Thales - a world renowned avionics corporation - is behind the push. It's also why I think this big 2m band scare is moot; someone didn't actually do the engineering, it's like they just threw out a random number and put it in a powerpoint slide.
This isn't about voice / ATC, but rather about up/downlinks for drones and such. From the background on the proposal:
> The decisions of previous conferences have introduced some restrictions to the use and have imposed constraints on the development of aeronautical mobile applications within some existing mobile allocations traditionally used by the aeronautical mobile applications.
> At the same time, the number of manned and unmanned aircraft equipped with sensors has grown significantly in the past 20 years together with the need of bidirectional low to high data rate communications. Aeronautical applications like fire surveillance, border surveillance, air quality and environment monitoring, traffic monitoring, disaster monitoring, terrain modelling, imagery (visible, infrared, radar, meteo), video monitoring require non-safety communications between various types of aeronautical platforms.
> Consequently the need of non-safety data communications between various types of aeronautical platforms increases and so the need for new frequency bands.
* https://cept.org/ecc/groups/ecc/cpg/cpg-pt-a/client/meeting-...