Anyone knows, if it is possible to connect a G4 antenna on the BV9500 Pro antenna connection to boost G4 signal?

If that would be possible and you'd use WLAN hotspot, you could turn it into an LTE router, which should add more
value in terms of functionality (and less stuff you have to take with you on vacation or during outdoor activities).

I'll cut to the chase first: It's not happening without a hardware modification. There are no provisions for doing this with the device as it arrives from the factory.

Of course, most smartphones have at least one antenna in the case versus etched onto the circuit board, and these sometimes use a very very tiny, very very thin, very very easily damaged coax to run from the circuit board to the antenna. Having mine apart, I did see ONE such cable. Unfortunately, I have no clue which radio it was for. 2G? 3G? 4G? LTE? 2-Way?

Just as often, they use spring contacts to do the job. I know I don't have the eyes or the hands or for that matter even the tools for doing fabrications on electronics so small, and even if I did, It would have to include either drilling a hole in the case for a new antenna connection or repurposing the 2-way radio antenna connection (thereby removing your ability to use the 2-way).

[Edit: after re-reading your post I see this was what you meant to do, but it doesn't change much... After having mine apart, I see they use spring contacts for that antenna which would be easy to disable or bypass but you'd still need to feed a micro coax from that point to the antenna connection of the radio. Then, how will you switch between the two connections, or would you just give up the 2-way radio? You also have the antenna itself to consider. Having measured the coils inside this antenna, I find it is a half-wavelength resonant right around 435 MHz (my measurements weren't exact enough) which would make it a full wavelength antenna for 870 MHz which might work but even at shorter wavelengths full wave antennas just aren't used often if at all (to my knowledge, and I can be wrong). I assume there's something about SWR or simply physics involved here but I'm still learning in that arena. Anyway, you'll get better performance with a different antenna. And, that's an SMA Male on the phone itself, the antenna is an SMA female. Do not confuse these with a common WiFi router antenna, which uses SMA-RP (reverse polarity) and would be too short for 4G anyway. But please let us know if you go this route, as I for one would find it quite interesting to read about!]

And this is just the basics. It would get so much more involved, so quickly.

Your best bet for improving 4G signal is to understand radio wave propagation and improve your conditions. At lower UHF frequencies (like where the 2-way radio feature of this phone works) you start to see things like "line of sight" become more literal where things like walls actually do interfere more than they do with e.g. VHF signals and where windows start to become your best friends. At the middle range of UHF, where the 2G/3G/4G radios operate, it's more pronounced. Try setting the phone in different parts of the room to see where signal is best. This idiotic looking thing where we hold our phones over our heads or under a table actually do work sometimes. The trick is keeping the phone there so you don't have to hold it.

You can also try eliminating sources of interference although at this point we're getting a bit into the weeds. In most situations, things like those little wall wart phone chargers are harmless, but when your received signal is at the same level as the noise floor, reduction of noise is your only option, so try pulling any unused wall warts, try unplugging computer power supplies, turn off fluorescent and now even LED lighting..... Really anything that turns mains voltage into low voltage without getting hot to the touch uses switch-mode power conversion and these are all sources of noise in the electromagnetic spectrum and they all will degrade your chances of getting a good signal. The more of them you can eliminate or at least move somewhere farther away, the better your signal will be. No promises it will be noticeably better, though, without getting neck deep in swamp water and breaking out the expensive tools like spectrum analyzers and highly directional antennas to seek out signals and sources of interference.


Hope it helps.

Ellorion wrote:

Anyone knows, if it is possible to connect a G4 antenna on the BV9500 Pro antenna connection to boost G4 signal?

If that would be possible and you'd use WLAN hotspot, you could turn it into an LTE router, which should add more
value in terms of functionality (and less stuff you have to take with you on vacation or during outdoor activities).

It doesn't look like a possible thing, in my opinion.