Jinx:

I'm doing some of the same digging and it seems your antenna length is  1
wavelength at 433 MHz.  AFAIK, you do have a 1/4 wavelength option which
might suit your design.  I am early in the RF part of my project but have
tried approx 7 in of 22gauge solid hookup wire on both sides and got 70ft in
building range. I'm reading the replies same as you so I hope the members
come up with something better.

Rich

-----Original Message-----
From: piclist-bounces@MIT.EDU [mailto:piclist-bounces@MIT.EDU]On Behalf
Of Jinx
Sent: Friday, January 26, 2007 12:26 AM
To: pic microcontroller discussion list
Subject: [EE] Aerial supplier


I'm probably looking for a supplier of dirt-cheap telescopic aerials,
either 17cm or 34cm. Most likely 200+, hopefully 1000+. If price
can be down around $1, $2 that's fine, but I appreciate that the
quantities are small on the transistor radio scale of things. Would
be just dandy if there was a box sitting in a Chinese warehouse...

But it all maat depend on the anwer to this question

Is a solid going to give significantly better reception than tube at
433.92MHz ? Is that too open-ended a question ?

I have a couple of prototype Rx-Tx pairs that are just fine with a
34cm length of 1.2mm enamelled copper wire. If it were just me
using it I'd leave it like that, but as this is to be commercialised it
has to look more "professional", so I'm being told. Harumph.
There's the packaging to consider too I suppose. A collapsible
aerial is smaller after all

If there's no significant difference between solid / tube, then I'll
be looking for the telescopic. I've made some enquiries (Taiwan)
but come up empty so far. Mostly they just don't answer, others
have said nothing suitable

If there is a difference in solid's favour, then I would like to think
of a solution. Maybe two pieces, pool-cue style, make it a bit
pretty

Any suggestions on the telescopic aerial supplier front would be
gratefully received, just in case aesthetics wins out over performance

TIA

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