View source

Kenwood TK-780 / TK780 information

TK780   136-162mhz model

Here is how to set up radio to do 135-178 tx/rx:

open radio
locate two holes (pll adjustment)
bottom hole TC109 tx vco (shouldn't need adjustment, does 135-178)

middle hole TC106 rx vco (shouldn't need adjustment, does 130-178)

Use KPG49D programming software and set "Sensitivity" to 7 (low), 75 (medium), 155 (high)
These settings control the varactor diodes in the front end preselector.
(original settings were 54/150/222)

Adjust front end by feeding 100-200mhz into the antenna with a tracking generator
and put a spectrum analyzer on TP2. Adjust L201/202 & L203/204



Other info:
top hole is VR1  (tx power)
right hole (under speaker) is L5 or L6 (discriminator?)

4 inductors on left (top to bottom) are:
L201(top), L202, L203, L204(bottom)

Receiver circuit goes from antenna thru L201/202, thru an RF Amp transistor,
 then thru L203/204.