> Think in terms of the old style VHF TV aerials with the ribbon cable
> coming down to the set

That was the picture which sprung to mind when Olin said "differential"

> A suitable balun is normally a few turns of wire on a ferrite core.
> The gauge of wire and core type both affect the characteristics of
> the balun

I've some old 900MHz cellphone gear that I use for parts and can
see quite a few small baluns on the boards, especially around entry
and exit connectors. Although none of my applications are as big-
business as cellphones I'll still make some effort to get the best out
of the modules. I'll have a look at OTS small baluns

The maximum permitted power level is 25mW BTW. The transmitter
datasheet says its output is 3dBm typical at 3V, supply current 10mA

However I do know that many of these modules will work up to 12V
Vcc. For some reason the erroneous 3Vmax Vcc has been repeated
and copied for years. I've had no failures with prolonged (years) 5V

Joe

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