I visited www.rfsolutions.com web page - but could not find any references to the RF data rcvrs/xmtrs. Looks like they are 'repping' various other lines of RF products as well as providing other RF engineering services targetted for wireless system's operators (cellular, PCS, trunked 2-way, etc). I've reviewed Linx Technologies products (link below) in the past - never bought any of their product (except some of the 900 MHz rubber ducky antennas and samples of their 'patch' antennas). It looks like they have done their homework - they basically have three tiers of miniature RF data OEM-level product, each one offering improved performance/features. http://www.linxtechnologies.com/f_modules.html They have detailed technical material of their product in pdf form - They also offer some ready-made eval boards - hook up RS-232 and go! http://www.linxtechnologies.com/m_evalkitdata.html Jim P. ----- Original Message ----- From: Jilles Oldenbeuving To: Sent: Sunday, May 28, 2000 4:02 PM Subject: [EE] Wireless communication... Hi... For prototypeing purposes we bought a couple of 4 pins 'complete AM radio transmitters' from R.F. Solutions. Also bought a couple of matching receivers ofcourse (433 MHz). (www.rfsolutions.com). My problem with them is this: when supplying Vcc (5V) and GND to the transmitter and connecting a function generator at the data in, of 2 kHz, 50 % dutycycle (coupled AC or DC) i can't see anything at the receiving end. I can't measure if the transmitter is actually oscilating at 433 MHz becouse the fastest scopes we have is a Philips 200 Mhz scope... Also the datasheets and the technical support are far beneath appropiate, in my opinion. The units were places 20 cm apart and had just a wire of 15 cm as an antenna. Anybody couped with the same problem? Anyone have experience with these modules (i mean the AM-RT4-433 transmitter and the AM-HRR-433 receiver, of RF Solutions) Jilles