I'm looking up counterpoise now... it seems to refer to anything from a=20 giant wire mesh to a single wire (6.5" for 433Mhz range). I'm hoping=20 you're referring to the single wire. I'll experiment with that tomorrow=20 when I'm back in town. Cheers, -Neil. On 8/4/2016 1:06 AM, 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 display >> 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 having >> 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 >> --=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 .