[Microwave] Cushman CE-15 Spectrum Analyzer

[George Jones]

I recently purchased a used Cushman CE-15 spectrum analyzer 
at a local hamfest. I plugged it in an checked it out at the
time of the purchase. The display looked normal. Upon
further inspection at home, I found that the front end sensitivity
was poor and the calibration was way off. It appears as if someone
keyed a transmitter into the input without an external pad.

Having worked with one of these units in the past, it seems to me
that there are a couple of resisters and a pico fuse in the front
end that protects the unit from such an occurrence. I do not have
a manual and am unable to verify the circuit. I have checked a 
number of resources on the Internet and it looks like Cushman is
either out of business or has been purchased by someone else.

Does anyone know where I can purchase a manual or get an Xerox copy
of the front end circuitry?

Thanks for reading my note.

73 George W4AQR

w4aqr@arrl.net