CQ Kilowatt Delta 5 Foxtrot Hotel Whiskey, here is Whiskey 5 Lima Papa Sierra,Originally Posted by AndrewGS
Nothing about the antenna output on this phone seems proper. According to the schematics on both the V180 and V220 Motorola units, a chip set called "Eagle" dictates what VCO values are sent to the "stub antenna". I know the antenna wire is just a single piece of wire rather than TRUE coax. The more I think about it, the more CRAPPY this China rig is! You and I both know that an antenna has a "radiating" element AND a "ground plane" element. What is missing in this phone is the balance of the 2.
My 1st order of business is to get a some RG-174 see:
I would use the RG-174 not only for the antenna feed, but the speaker leads as well!
I would solder the center conductor of the RG174 to the square pad and the braid to a full wave 1900Mhz cut of wire taped inside the housing as it's ground plane. I would then solder the center conductor of the 174 to the center pin of the antenna connector and the braid to the threaded part of the antenna connector. While digging and scratching with the soldering iron, I would replace the 2 FAT speaker wires with one run of the 174 coax AS the speaker wires. That should clean up ALL spurious RF leaks! Then, check to see that the advertised 2.5db gain antenna is a "real" antenna, if not, order a USA made injection molded replacement!
There still has to be a "reason" that they didn't just solder the antenna wire to the large square pad! I wanna know why! Ooopss...perhaps they didn't want to use "balanced feed line" like RG174...never mind...that's why. Slap it together and blow it out the door! With the cost of return shipping, most of us will just drop the phone in the nearest dumpster. Well, NOT me! I'll gut this puppy and go here:
A good idea always has room for improvement
and or, put that in your pipe and smoke it!