Monday, Aug 01, 2016 at 22:36
Its very hard to know exactly what is going on with those figures without knowing how and where they where taken and exactly what they represent.
I Assume that they are field strength in dBm as displayed on some sort of app in the
phone.
What the variation represents is anybodies guess.
But what is certain is that the best case is 7dB of gain on the RFI aerial ..... a gain but not a massive margin but at worst it only gains 1dB ..... not even statisicly relivent.
The laser seems to provide 9dB of gain in one line but as little as zero dB on another.
So that means on both aerials .. between a modest gain and pretty much no gain at all
The problem with most modern phones is that either they don't have any direct Aerial connection and require some sort of proximity coupling, Or If they do have an aerial socket it performs poorly.
I and others like me who have some sort of RF trade background have tried to achieve in car or in
home range performance with mobile phones and some sort of external aerial and found improvements over a bare
phone in hand illusive.
THE single biggest issue is getting sucessful coupling to the
phone.
Note that neither Apple nor Samsung seem to offer a genuine car kit.
I do not believe it is a problem with the aerials, Because I do a little work with other things that operate on the mobile networks.
Systems that we formally commission and require field strength readings.
Those systems all have external aerials and properly constituted aerial connectors.
It seems to me that the deigners of hand held phones have no interest in them being used with external aerials ..... thus this whole car kit exercise seems to be a fools errand.
In that there is more loss in the connection between the
phone and the kit than a perfectly functional high gain aerial can provide.
For those who are serious about long range in car mobile
phone reception there are still fixed in car mobile phones available ...... units that have properly constituted aerial connections ...... pick up any trucking magazine and you will find the adds.
I do not believe that changing the aerial will give you any better results.
sorry
cheers
AnswerID:
603026
Follow Up By: The Bantam - Monday, Aug 01, 2016 at 22:43
Monday, Aug 01, 2016 at 22:43
OH and remember with mobile phones, particularly at distance from the base station.
THE predominating factor is line of sight reception ..... having the aerial or the
phone high and clear can achieve a great deal.
cheers
FollowupID:
872678