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This PLL is now
fitted to Unidens
that say "Made in
Malaysia" on the
back panel. This
chip is a clone of
the MB8719 with a
few changes..
The VCO will become
unstable when it is
expanded out of the
normal 'FCC'
channels.
Pin10 (divide by
Ncode) has to left
'floating' if you
tie it HIGH or LOW
the VCO again
becomes unstable and
will not lock on.
The only way to
modify this radio is
to replace the
RCI8719 PLL with the
older MB8719 PLL.
The resistor near
Pin9 needs to be
removed and a jumper
wire with a ferrite
bead put in its
place to reconnect
power to pin 9. As
this radio is not as
broad banded as
previous Unidens it
might not be worth
the expense of the
new chip
(THE
SCREWDRIVER EXPERT’S" GUIDE By
Lou Franklin, K6NH) |
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