[Elecraft] K2 and a noise bridge

[Parker Buckley]

Ron,

I regularly use a noise bridge as a tuning aid for my
antenna tuner.  I built one of the TenTec noise bridges,
adjusted it to null at 50 ohms, shorted out their pulse
feature (someone there thought it was a good idea to pulse
the noise with a 555 timer) put it in a box with suitable
switches and use it to adjust my manual tuner without
transmitting.  A very small fuse protects the device when I
forget to switch it out of the circuit and try to trasmit
through it.  Palomar makes a commercial version.  Anyway, it
works quite well, producing very sharp nulls.  I suggest
using a 50 ohm resistor for reference, set resistance scale
to 50, reactance to 0, and make very small changes about
these values until you see the null.

Parker
WD8JOL K2 #2636