[TenTec] portable power for Scout

[rohre]

Mike,
You said a "9 volt battery???"
Michael,

WAY TOO LOW for the Scout.  Must be a battery that maintains 12 volts key down
or you will have no voltage regulation on the oscillator, and on the various
critical circuits. (Thus giving the symptoms you observe.) Current should be
from something like the 24 AH 12 Gel Cell I use to give you all day operation,
(or all weekend).  You need to measure the current drain, with an ammeter
built into many DMMs today, like a Fluke 70 series, and use some battery with
some reserver of say twice that current drain, or even 4 times.  CW would be
about a 50 % duty cycle, and SSB more.  It depends on your hours of operation
and your operating habit, whether to listen a LOT more than xmit, use of CW,
etc.

IF you unsolder the red wire going to the final heat sink, and reroute the
coaxes to the final heat sink, and instead go from the driver stage to the
plug in final low pass filter, and back from the plug in filter to the Ant.
connector with the coax jumpers that you plug into the mother board, you will
convert the Scout to 5 W equivalent of the 556.

That is likely the mod the factory was describing.  Does not take long to
implement, and easy to reverse.  It removes the idling current of the final,
at 5 Watt pot setting.  Also reroutes the driver transistor to be the final
for QRP.

GL, Stuart K5KVH  Happy Scout owner

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