BoxCar

Inductive coupling. The magnetic field from the base couples the field from the antenna to the roof.

Got my Tech the 19th so I know how you feel. KO4OCP

The FCC has the right as part of your license grant to inspect your station but they don't have the right to seize the equipment. That's what the court order was for, to seize the equipment.

Laws regarding the use of radios is mostly silent. The key difference between cell phones and radios is a radio doesn't connect to the telephone network, conversations are short, no text messaging or video.

Both services are active during emergences with the larger base being amateur radio because of its existing infrastructure and recognition by emergency service agencies from fire, law and Red Cross. GMRS/FRS can't compete due to a single frequency band, lower allowed power and lack of a national organization setting up recognized guidelines. In some areas where evacuations are more common you will find a lot of people using the FRS bubble-pack radios but with no real coordination or information sharing.

Whatever you end up getting, the outer sheath needs to be UV resistant. Not all coax coverings are.

There's nothing wrong about a J-Pole. They work, and work well but there are better options with other antennas that offer gain which a J-Pole doesn't.

You can always try replacing the fan with a different design. It shouldn't be too difficult to find a 12V fan of that size.

Which radio? there are a lot of the Btechs

They market the radios under Part 97 (or more likely just broadcast the frequency range and don't worry about the FCC because they aren't within the FCC's jurisdiction).

You are both still causing interference to the other user. If the signal phases are enough out of alignment you will end up cancelling each others transmission. Yes, the field strength of the pair of transmitters in your example should overpower the other, there is no guarantee it will work as there are just too many variables to consider.

You can't have more than one concurrent conversation in the same area regardless of tones. They use the same carrier frequency which interferes with others. My radio indicates the channel is busy even though I don't hear the ongoing conversation.

Way too much for a 360W power supply. This one well supply all you need; MEAN WELL LRS-350-12 DC Switching Power Supply 12V 29A 350W for CCTV, Computer Project, 3D Printer, LED Strip Light, Router

Then you'll need a quad pole terinium filled filter for your receiver. They're available at Mxltypyx's store on Venus for 400 gold filled latinum bars.

Almost all public safety systems use repeaters to extend the coverage within their serving area.

And I'm certain that the first device you used to check an antenna's efficiency was an antenna analyzer. People usually learn to crawl before they do handsprings with advanced level equipment such as the Vector Network Analyzer.

There are two primary ways to get license totals. I'll lay odds Berkinet filtered the list by asking for active licenses onlt.

The 6.1 meter or 20 foot rule means the structure is not subject to registration. Towers and poles greater than 20 feet in height are usually listed on the license as the transmitter location. This primarily applies to services where individual frequencies are required to be coordinated which isn't needed for personal or amateur communications. There are other rules that apply such as being near an airport or lighting for antennas more than 20 feet in height.

Start with a search on the license type specifying your state, county. If it's not there, try looking for the frequency using a B/ILT license type. If you don't find it there, contact the FCC and file an interference complaint from an unlicensed station and give them all the details you can.

L bracket. Here's one but there are a great many others. Larsen TMB34B GigaParts.com

Here's a better one. B4505CS Chrome Base Coil Half Wave Antenna - NMO Spring - 450-470 MHz – Arcadian - ArcAntenna.com

Output power isn't the biggest factor in calculating range, It's antenna height and obstructions. Power does play a good part but it's all about location, location, location. Granted 45W will transmit further than 5W but not that much more than 25W through the same antenna.

The license holder is required to be in control of the station. How would that control be exercised if the two people where in different locations?

Usually an unlicensed person can use a GMRS radio if they are in the presence of a license holder being responsible for the operation. That can best be visualized as standing next to the unlicensed person.