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Ham Radio 2000 #2
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Ham Radio 2000 - Volume 2.iso
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HAMV2
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MODS
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KENWOOD
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ts440-at.mod
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1997-12-21
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51 lines
TS-440S MODIFICATION TO USE ANTENNA TUNER FOR XT AND RX.-
Remove case from rig. Remove (4) screws that holds antenna tuner in place.
Next slide antenna tuner out to get to the coax connections. Remove the input
coax attached to antenna tuner from FO connector on filter unit (X51-340-00).
Remove coax from out connector on antenna tuner and install in FO CONNECTOR ON
FILTER UNIT. Unplug and remove switch unit (X41-1610-00 N-14) from rig.
Remove short wire from antenna connector to PC BOARD. Cut coax on the input
connector of antenna tuner in half and connect cut the end to switch unit PC
BOARD where short antenna wire was removed and shield to ground. Solder other
half of coax to antenna connector and shield to ground, and plug other end
into output connector of antenna tuner. You still have control of antenna
tuner with auto and thru switch.
It works very well. Maybe someone can use this idea.
N2EDE, Box 680-S, Roanoke, VA. 24012.
Illustration captions:
1. Remove 17 screws holding on the bottom and top covers. The bottom
cover comes off, and the top cover is carefully removed and put next
to the radio. It is till connected via the speaker wire.
2. Gain access to the front of the unit by removing two top side
screws and loosening two bottom side screws. This allows the front
assembly to swing open.
3. Remove the shiny silver control board protection plate. This
requires removing two screws on the top and three screws on the
bottom. Lift the plate out completely.}
4. Locate diode D-80 in the bottom left-hand corner. Snip it for
all-band transmit.
5. Now locate D-66 and snip. It adds 10 Hertz readout to your
digital frequency display.
6. Carefully reassemble the control plate using a magnetized tiny
screwdriver to hold the five tiny screws in place. Don't pinch any
wires. Also, close up the front and replace the top and bottom covers
with 17 screws.
7. Connect power. Depress A=B switch and turn on the power
simultaneously. This resets the microprocessor for all-band transmit
and 10 Hz frequency display.
This article also tells how to increase the power of the TS-440 by
adjusting the internal ALC control. The procedure is applicable to
other rigs.