geraldm at COMMTELNS.COM
Thu May 8 03:05:42 EDT 2014
FYI. Last weekend my LPRO-101 decided to give up after 6 years of non-stop service in the shack. The symptom was no 10MHz output. I checked all required regulated voltages, all appeared well.
I started to prod and poke around the 20MHz VCO area and found that the slightly touch of a wet fingertip kick started the 20MHz VCO. I recall reading Fred ( PE1FBO ) repair guide some years back, He had mentioned failed 100K 0603 resistors.
As it turned out, I ended up replacing 7 x 0603 100K resistors on the base side of the PCB, most measured well in the mega ohms. All other resistors appeared to be as normal as you could measure in circuit.
Very pleased with the LPRO-101 given the age of my unit (15 years old) , and the lamp voltage is healthy 8.3 volts.
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