[ARC5] Why an UNUN?

[Neil]

> Pick a number...any number...between 0.1 and 13.  <huge grin>  If you'll
> go to http://aafradio.org/docs/Aircraft_Antenna_Design.html you'll see
> why it's difficult to specify a lower limit for a transmitter designed
> to go in a number of aircraft, from small fighters to large bombers.
> Their example is a 47 foot antenna resonant at 5MHz, operating at 3MHz -
> the radiation resistance is 1.9 ohms. The graph at the bottom is perhaps
> more useful in visualizing the problem.
>
> 73,
> -  Mike

>> The 13 seems a bit high. Is there a lower limit given also? I don't have
>> that manual to hand.
> I've seen a figure of 5 ohms, but I can't recall where.
> Most likely on this very forum.

I didn't express myself as clearly as I should have, and meant that
somewhere I've seen 5 ohms as the impedance that the transmitter
is designed to work into.

73 de Neil ZL1ANM