> I'm looking for a cheap source for quarter wave whip antennae for use with
> this module
> <http://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 


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