1. Try it.
2. You should be able to make a transmission line balun pretty easily
at that frequency if required.
3. an old trick is just to connect the ends of the feeder to the
dipole but feed the feeder cable through a ferrite bead to prevent rf
current on the outside of the coax.

Rp

On 21/06/07, Zik Saleeba <zik@zikzak.net> wrote:
> I have an RF question which has been bothering me for a while. I have
> a 900MHz 1W transceiver module which I'm planning to put in a model
> plane for telemetry purposes. Every gram counts so rather than using
> an off-the-shelf antenna I'm planning to make a dipole from conductive
> foil tape stuck to the wing. I have a small amount of experience with
> VSWR meters so I think I can get that part of the system working
> pretty well.
>
> My problem is that the output of my transceiver is 50 ohms unbalanced
> and dipoles are an inherently ~73 ohm balanced antenna. I want to
> connect the transceiver to the antenna in the lowest loss way I can so
> I'd prefer to avoid using a balun if at all possible. Weight is also a
> consideration here.
>
> Is it "good enough" to connect the signal and ground to the two arms
> of the dipole or is there some better low-loss, low-weight way I can
> do this?
>
> Incidentally this is a for-fun project, not a hugely important
> commercial application so some bodginess is fine.
>
> Cheers,
> Zik VK3MHZ
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