On Wed, 5 Jun 2019 12:12:10 -0700 (PDT), Tom Kunich
wrote:

On Wednesday, June 5, 2019 at 11:28:42 AM UTC-7, Jeff Liebermann wrote:
Also, there are now so a substantial number of cellular bands in use
(and growing with every FCC auction). Unless you plan to carry a
rather large box on your bicycle, it is unlikely that you can
efficiently jam all of them. At best, a simple jammer will take out
all the customers of one particular vendor, leaving the other vendors
bands unaffected.
http://www.gasiajammer.com/sale-8508330-new-all-in-one-16-channels-high-power-desktop-signal-jammer-70-meters-sheilding-range.html
https://www.youtube.com/watch?v=gMOpxrs53YQ

What WILL work is that you have a local short range transmitter in
every vehicle which switches cell phones into a mode in which only
directions and emergency calls can be used.

I beg to differ. The "short range transmitter" will need to operate
on all the cellular bands in order to work with any service provider
and technology. It might look like the abomination in the above URLs.
You could probably substitute a fast frequency hopper and large
broadband antenna (discone). However, the modulator and SDR (software
defined radio) needed to clobber any an all cell phones, no matter
what band, frequency, and modulation scheme is being used, is going to
a design challenge. Of course, accidentally jamming cell phones used
by public safety vehicles will be a problem because there's no way to
distinguish distracted motorists talking on cell phones from
legitimate emergency traffic.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558