The sensitivity of the NCE BD-20 is adjustable, based on how
many times you loop the wire through the toroid.
As shown in the BD-20 manual, a 10-amp set can only have two
wraps, resulting in the need for less than 5 kohms to achieve
the minimum 4 mA detection current. So, I suggest using 5
kohm resistor wheel sets and doubling the number of cars with
resistors on them.
However, a 5-amp booster district can have 4 wraps, so 5
kohms would work out fine!
If you really want to be covered, put a 40 kohm resistor wheel
set on every car and accept the ¼ amp current drain.
8
8: PCMRC control panel – block detection tells the oper-
ator where to look for his train. See two yellow LEDs illu-
minated on the left side of the panel – track 2 and track 6.
Photo by the author.
DCC Impulses - 7
MRH-Aug 2013
