Modifications for the Kenwood TH-47
TH-47A Mods for ext frq
Radio will cover 400-470 MHZ.While scanning,a beeping sound will be heard
at the band edges indicating PLL unlock condition.To eliminate this annoyance:
Remove battery and antenna.
Remove case as follows: Remove volume,squelch and tuning knobs by
pulling straight off.Remove shaft nuts using needle nose pliers or
other such tool.Remove 4 screws from the case.NOTE: Do not remove
the 2 screws that are on either side of battery release latch.Lift
plasctic top from radio while separating the radio halves.
Open the radio up like a book and place on work surface.
Cut or unsolder green wire loop on the control board.
Reassemble radio,Reset microprocessor.
Radio will now cover 400-470 MHZ RCV/XMIT with no annoying beeps during
scanning.Leg # 62 is the UL input to the microprocessor to tell it that an
unlock condition is ocurring.With no input,the Microprocessor thinks that
the radio is always locked,and no error beeps will sound.This MOD also allows
XMIT,but that is the price you have to pay :-)
Open up radio as indicated above.
Lift up microprocessor IC303 leg # 62(This is the bottom microproccessor)
(Third leg on left side from the bottom)This should be done only by those
comfortable working with SMT components.
I have done this MOD to my radio with no ill effects.This MOD should also
work on the TH-27A.
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