I'm trying to read 433MHz OOK/ASK data from a Radio Shack remote temperature transmitter.
I've tried a bunch of chinese receiver modules, best so far is superhet with a 10.7MHz IF and crystal filter, uses
PT4303 IC in a module called
"SRX-882".It has 32mm helical spring antenna which works OK but the noise floor gets terrible once I am near a PC or connect a logic analyzer to it. Ferrite beads and clamp-ons help to a point- but I think I need more signal. The spring antenna is rated 2.15dBi
The battery-powered Radio Shack LCD display (receiver) uses a dipole antenna inside.
But the PT4303 is single-ended. I didn't think a dipole works when ground leg has a bunch of stuff connected to it? i.e. a PC. I could make a balun.
Just looking for a few more dB gain antenna that isn't too hard to build so I can analyze the data stream.