[Premium-Rx] Odd behavior by NRD-515

[Rick Robinson]

You may want to go to the site below and download the '515 schematic.  
There is a most unusual circuit in the 600kHz - 1600kHz bandpass 
filter.  I'm not sure exactly what that diode and transformer 
configuration is but it could easily cause loss of sensitivity in that 
band of frequencies if not working properly.

http://home.hccnet.nl/w.geeraert/tif/app3.pdf

Rick