I'm curious, why did you decide to go custom instead of using off the shelf such as WiFi? On Aug 4, 2016 4:36 AM, wrote: > Second that. You should be using a "counterpoise" (ground plane or > rods) with a 1/4 wave whip antenna to get correct impedance match and > optimum performance. A whip antenna is actually only half of the > antenna. > > /Ruben > > On Wed, 3 Aug 2016 23:06:49 -0600, David VanHorn > wrote: > > Quarter wave and counterpoise? With antennas "short" generally equates > > with "sucks". I have seen a counterpoise add 6db even to a helical > > "ducky". > > > > On Aug 3, 2016 10:58 PM, "Neil" wrote: > > > >> Hi all, > >> > >> I built a quick device for a friend that lets a receptionist send > >> messages from a PC to a desktop display device, and vice-versa with a > >> handful of canned responses. The PC side uses VB to serial (via USB), > >> to a USB-to-serial interface, then a 433 Mhz serial module, through an > >> IPEX-to-RP-SMA interface, to a short whip antenna. The desktop displa= y > >> device also has the same 433 Mhz serial module (controlled by an > >> Arduino), to the same IPEX-to-RP-SMA interface cable, then to an > >> identical whip antenna. > >> > >> I'm not getting the range necessary... I'm getting 35-ish feet indoors > >> (through one wall), and need about 100 feet indoors (in an office > >> through a glass wall). I've tried a 433 Mhz PCB antenna, but that got > >> me less distance than the whip antennas. And the whip antennas are > >> listed as being for 433 Mhz. > >> > >> Any clues on how to get better distance? I'm looking for 433Mhz > >> amplifiers, but they're a bit pricey. I'm short on time, so hoping to > >> find a ready-made solution (if an amp is necessary), rather than havin= g > >> to build one. > >> > >> Cheers, > >> -Neil. > >> > >> > >> -- > >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > >> View/change your membership options at > >> http://mailman.mit.edu/mailman/listinfo/piclist > >> > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .