>I have a PCB with a loop trace (correct term?) antenna.  That
>is, its a track that's right around 1/2 wavelength long.  I want
>to put a variable cap on that and then be able to tune each pcb
>for optimum resonance at my radios freq.  What equipment would
>I need for that?  A signal injector?  A network analyzer?
>The freq is 916Mhz fixed incase that helps.

You do not say if this will be for a production environment, or for a
one-off project.

Personally for a one-off I would use a suitable receiver (possibly without
aerial, to keep the received signal strength low enough, as they will be
close) where I could measure the signal strength by looking at the AGC
control voltage with a suitable moving coil meter, and tune for maximum on
the transmitter.

However if you are doing a design for a production environment I suspect you
would look at using a network analyser to work out optimum fixed component
values to tune the aerial. The tuning will be broad enough that fixed
component values should be suitable, and then probably do a batch check of a
half dozen before the production batch goes through, on each production
batch.

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