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'[EE] Aerial supplier'
2007\01\26@032610 by Jinx

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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

===============================================
If you aren't part of the solution, you're part of the precipitate

2007\01\26@060935 by Peter P.

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There is correlation between length and diameter for impedance matching and
tuning. I.e. both length and diameter matter and one depends on the other to a
certain extent. Can you use some elastic wire that is insulated (sleeve or
plastic clad) and can be folded ? Ev. with an end cap of some sort ? E.g. toys
often use 'piano wire' antennas and they are commercial enough. The end is
either capped with a plastic blob or formed into a loop to avoid poking holes in
people and objects (such as packaging). If you use this pay attention to how the
antenna is secured to the board. An elastic antenna will try hard to cause its
solder joint to fail if soldered directly without strain relief and
immobilization.

Peter P.


2007\01\26@061010 by Wouter van Ooijen

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> 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.

maybe too long:
http://www.goldmine-elec-products.com/prodinfo.asp?number=G14088

I recall such antenna's for a similar price at a 'regular' supplier, but
I can't recall where.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu


2007\01\26@063117 by Tony Smith

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> 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...


Oatley Electronics had some a while back.  I haven't checked lately.

Tony

2007\01\26@064830 by Alan B. Pearce

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>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

Is there a reason why it has to be a full 1/4 wave? Is there a reason you
cannot use a "rubber ducky" type short helix like the ham guys use on 70cm
walkie talkies?

I would suggest you talk to your local ham radio guys and see if you could
purchase such an item as a spare part. I imagine that with the quantities
(and showing you are not setting out to compete) you could probably organise
a reasonable discount.

2007\01\26@072429 by Howard Winter

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Jinx,

On Fri, 26 Jan 2007 21:25:45 +1300, Jinx wrote:

{Quote hidden}

No & no!  By "solid", do you mean springy wire?  Generally, the narrower the antenna the tighter it is in tuning - you may not want that anyway, so a
tube is more forgiving than a thin "solid" wire.

{Quote hidden}

I'm a bit surprised by this - but it may be that you're a couple of orders of magnitude below their MOQ.

> 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

Since you're in the 70cms amateur band, there must be a load of antennae out there for that - the "rubber ducky" type are shorter than you say (a
tad less efficient, but I imagine you aren't on the edge there) and are very packaging friendly!  Probably more than $2 though...

You may want to have a look at these people:  http://www.antennaworld.com  who do a portable dipole that telescopes,  covering 136 to 450MHz.  I
know because I have one - it's not what you're after, but they may have other more suitable stuff.  Unfortunately their web site seems to have some
problems, so I haven't been able to search for the sort of thing you're after.

Cheers,


Howard Winter
St.Albans, England


2007\01\26@123553 by Richard J. Pytelewski

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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 removed}

2007\01\26@165907 by Jinx

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> hope the members come up with something better

I'm definitely investigating the Slim Jim design, as suggested by
Dennis Crawley, for some applications

http://www.hamuniverse.com/slimjim.html

For the majority of users a 1/4 wave, eg wire or small telescopic,
will be just fine, but I'd like the option of 1/2 or 5/8 if cost and
packaging space permit

2007\01\26@170826 by Jinx

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> maybe too long:
> http://www.goldmine-elec-products.com/prodinfo.asp?number=G14088

Good catch

I looked at my portable TV's antenna with a hacker's eye the other
day and wondered about how much they are. If I accept that the
packaging is going to be longer than originally envisioned, anything
is possible

Thanks to all other repliers, I'm following up on suggestions

2007\01\26@180508 by Richard J. Pytelewski

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Jinx:

I  took a quick look and found this at Digi-Key - you may want to look at
rocky.digikey.com/WebLib/Linx%20Technologies/Web%20Data/SP%20Series.p
df
which is a planar antenna and $1.75 at 100 pieces ($2.08/1).  Its small and
mounts internal to your project case.

Rich

{Original Message removed}

2007\01\26@182232 by alan smith

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also check out LINX Technologies
 
 In addition, Pulse Magnetics just picked up a line of antennas as well.  Not sure if you have a rep  in your area, but mine just dropped off a catalog as well as some sample antennas
 
 
Jinx <spam_OUTjoecolquittTakeThisOuTspamclear.net.nz> wrote:
 > hope the members come up with something better

I'm definitely investigating the Slim Jim design, as suggested by
Dennis Crawley, for some applications

http://www.hamuniverse.com/slimjim.html

For the majority of users a 1/4 wave, eg wire or small telescopic,
will be just fine, but I'd like the option of 1/2 or 5/8 if cost and
packaging space permit

2007\01\26@185107 by William Chops Westfield

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On Jan 26, 2007, at 1:58 PM, Jinx wrote:

> For the majority of users a 1/4 wave, eg wire or small telescopic,
> will be just fine,

I found at least one vendor who was selling fancy plastic covers for
"wires" so that they'd look more like "real" antennas.  If you're
worried about customer perception as much as performance, you might
want to consider a homebrew version of that as well (the covers being
sold exceeded your target price, and were mainly for 1/4 wave higher
frequency designs (max length 4 inches or so.)

BillW

2007\01\26@190823 by Jinx

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> I found at least one vendor who was selling fancy plastic covers
> for "wires" so that they'd look more like "real" antennas

Might be able to do something passable with heat-shrink or tubing
meant for a completely different product, eg plastic furniture, cable
fill etc. To me the enamelled copper is less intrusive than chrome
anyway, but what do I know about fickle fussy customers

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