I am working on a Drake UV-3 tri-bander with a non-working 440 Mhz section.
Making progress, however the VCO uses a push-pull arrangement that has the SPF
796 (Drake P/N 3030355) matched pair of JFETs. One JFET had excessive leakage
on its gate so I need to replace. I can't seem to find any specs on these
devices sinc ethey were Motorola "house numbers". I am going to try a lot of 25
pieces of MPF 102 JFETs and see if I can match to get 2 that are close to each
other and work within the schematic references of Vds of 4.25 volts, Gate
voltage of -2.0 volts. Current looks to be 5 ma at this operating point.
Can anyone suggest a better plan or has worked up suitable replacements ? This
matched pair has also been used on the Drake TR7, Drake P/N 3030355.
Best 73's
Paul - WB2NMI
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