[ARC5] A simple receiver improvement

[Kenneth G. Gordon]

On 14 Jan 2014 at 10:27, Glen Zook wrote:

> Although definitely not an "exact" match, television baluns can work
> wonders in matching the usual 50-ohm coaxial cable antennas to older
> receivers.

What I don't understand in this case is that the impedance of the original 
antennas on the aircraft is supposed to be on the order of 5 to 20 ohms.

So, why does this help the receiver so much?

Is the input impedance of the receiver really so high that the 300:75 ohm 
transformer really and actually improves matters as much as it appears to?

BTW, in answer to a question I received off list, I connected my balun with 
the 300 ohm side connected to the receiver antenna connector, and the 75 
ohm side connected to my antenna. I presumed that the receivers' input 
impedance was "high".

Ken W7EKB