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run the engine. It can sometimes take
up to 20 minutes to fill the day tank.
Sometimes, we forget the toggle switch
is on and the tank overflows through
the vent line onto the deck. I need to
devise a way to automatically turn off
the pump when the tank is full, or at
least after a specified interval of 5 to 10
minutes. There is no access for a float
switch in the tank. Maybe some sort of
#2 Try this site for your Conar 251
[#1125 - January 2012]
Yagi Antenna Question
I live where cellular reception is
poor, and I depend on a cellular
modem, amplifier, and Yagi antenna
This problem is easily solved with
a "spring timer."
This is a spring driven 120 VAC
switch available at Home Depot,
Lowe's, or an electrical supply house.
Often used to turn lights out in store
rooms or laundry rooms automatically
when not needed, it is a spring
driven electric switch that fits inside a
standard electrical box and is available
in various maximum times such as one
hour or 15 minutes.
To operate, one twists a knob to
the amount of time needed, the load
comes on, then goes off when the
time runs out.
Lying Julington Creek, FL
[#12113 - December 2011]
Conar Model 251 Oscilloscope
I need a schematic or manual for
the Conar model 251 oscilloscope
which Conar, I understand, was
bought out by NRI/National Radio
Institute/McGraw Hill. This is an old
single channel 10 MHz analog scope. I
need the manual to repair the scope. I
already know the power supply works
and the cathode ray tube works since I
see a momentary dot when the scope
is turned off. I am on limited income
but will be willing to pay for a copy of
the schematic or manual for this scope.
#1 You might check out www.
W7FG.com (Vintage Manuals).