[Lowfer] Hz question.

[JD]

>>> What kind of problems would this cause and how would it manifest itself?

It would mean the test setup is much more sensitive at some frequencies than 
others, giving misleading results.

I don't really know what type of core materials I was testing, as they were 
encapsulated and the color was obscured; but given the high inductance 
values I was getting from them, I can at least be reasonably sure they were 
ferrites of some type rather than powdered iron.  For what you are planning 
to do, I might recommend using the fewest necessary turns that give you 
sufficient signal, along with a load resistor across the secondary (perhaps 
in the 50-100 ohm range) to swamp any effects you might encounter from the 
radio's input being not perfectly pure 50 ohms resistance.  That'd probably 
prevent most anomalous behaviors.

Depending what your answer to Dex's question is, another good alternative 
for coupling to the radio might be a line impedance stabilization network 
(LISN).

John