Post by thread:433Mhz whip antenna source & info needed

> I'm looking for a cheap source for quarter wave whip antennae for use with > this module > <www.lprs.co.uk/pdf_directory/2386mylprs1110799793er-data-sheet-v2.pd > f> > This company do a suitable antenna at a rather pricey STG£4.67. There is > probably (I hope) a cheaper source for something which would do the job. I'm > really looking for a flexible antenna of the type you see on walkie talkies. > Some rough handeling can be expected on these units. > > As I am somewhat uncertain when it comes to RF work, I am also looking for > some advice.... apparently a 1/4 wave whip antenna really needs a ground > plane. Does anyone know a rule of thumb for the relationship between the > antenna length (in this case ~16.5 centimeters) and the dimensions of the > ground plane? Check with Linx Technologies. They have several antennas for this frequency, and some decent app notes. http://www.linxtechnologies.com/index.php?section=support&category=application_notes The Linx LR series receiver data sheet has a design guide for microstrip, ground plane & antenna placement you might also find very useful. http://www.linxtechnologies.com/images/products_cat/rf_modules/lr_series/lr-rxm_manual.pdf Regards, Bruce http://www.rentron.com