[Lowfer] (More) Ultimate LOWFER Transmitter?

[John Davis]

>Ha-ha.   Very funny :-)    A little early for April Fools isn't it ...


Continued thought on multiple radiators:

A DC analogy may help.  Consider a case where you have a couple of 12 volt
batteries as sources to represent the coherent, close-spaced
antenna/transmitter systems, and you have a 10 ohm load resistor to
represent a receiver.

Let's first suppose the sources are very inefficient--for example, the
internal resistance of each battery is 1200 ohms.  In that case, the current
delivered to the load is just a smidgen less than 10 mA.  The voltage across
the resistor is approximately 100 mV, and the "received power" is roughly 1
mW.

Now let's add the second source.  The math shows that EACH source is now
delivering almost 10 mA to the resistor, for a total of just under 20 mA
current, and a resulting voltage of nearly 200 mV across the load.
"Received power" is now 4 mW, or 6 dB greater.

If one were to make the sources much less inefficient, the quadrupling of
power no longer occurs.  Suppose the internal resistances of the sources are
now only 20 ohms each.  One source produces 400 mA in the load and a
"received power" of 1.6 W.  Adding the second source in parallel produces
600 mA, for a power in the load of 3.6 W; now only a little more than
double.

73,
John