hi, everyone..
i am now at the alignment and test phase, part II... and am having a
little problem..
under the 4MHZ oscillator calibration, i hooked up the frequency
counter probe and plugged it into TP3.. but i get a zero reading..
well, the digits fluctuate in the 10ths place.. but it's pretty much
zero..
so i read that i could have a problem with the PLL reference
oscillator. i am guessing that my probe is good, as it worked in the
previous testing..
so i went to the trouble shooting section.. and built the RF little
probe.. (by the way, i LOVE how elecraft uses spare pieces of
building materials to let you build your own probe!)
under the pll reference oscillator and VCO section on page E10.. i
did the following measurements..
reference oscillator output - 1.274v - expected value - 0.8-1.8v . OK
VCO output - .318v - expected value - 0.30-0.40v - OK
VCO buffer Output - 0.030v - expected value - 0.60-0.75v - BAD
i tried following around on the schematic, but i am not sure where to
go at this point..
can anyone give me some pointers as to what i should be looking at?
thanks!
sergio..kb8qpt
___
peace,
sergio
photographer, journalist, visionary
www.village-buzz.com
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