Joe, did you measured the output power ? If only 100m range I've quess
is a lot  below 0dBm ...
Did you have lately some questions asked in EDA board ? There is a
topic about the same problem.

I have two talky-walky from radioshak (below $20) running at 433MHz
and 20 channels with a short antenna, able to connect at 8Km LOS. Made
in China like everything... Just for fun I'm adapting the pair for a
FSK modulation with a 12F675.

On 4/13/07, Jinx <joecolquitt@clear.net.nz> wrote:
> I'm going to try the Slim Jim method (pipe or 300ohm), suggested
> by the list a little while ago, to see if it extends the range of a 433MHz
> data transmitter. Present range is about 100m+ with a 1/2 wave
> heavy-gauge copper wire
>
> http://www.hamuniverse.com/slimjim.html
>
> http://www.hamuniverse.com/2meter300ohmslimjim.html
>
> On those pages it shows both conductors of coaxial connecting to the
> Slim Jim. I understand that the core would be connected to the aerial,
> but where does the braid fit in ?

It's a vertical dipole, Jim didn't invented the boiled water just
applied the physics. Hot wire to one dipole side, braid to the other
dipole side. Adapting impedance problems ?  Yes if it's wrong
computed.


>
> The transmitter I use has an antenna output, which would be the core
> of the coax. Does the braid connect to the transmitter ground or what ?
> It seems to me that would just short the transmitter output. Do the
> radios this is intended for differ to what I'm thinking of ?
>
> 433MHz is about 69cm. Any suggestions re comparison to 2m ?
>
> TIA
>
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