Also, make sure that the power connector pins are tight and that the
power connection to the vehicle battery is good and corrosion-free. Too
much voltage drop will affect the stability of the Scout. Once, while
operating SSB, my Scout took off several kHz down the band. I traced the
problem to a corroded crimp on the power cable. Now I solder all power lugs.
There was a Ten Tec recommended modification to shorten the leads
between the PTO coil and circuit board to reduce vibration sensitivity.
Stability can also be improved by adding a small CPU fan to the heat
sink or reducing power to about 30 W. I found that heat from the final
amp can migrate along the chassis side wall to the PTO. There is also a
mod that replaces one of the 15 pf N1500 temperature compensating caps
with an NPO type. Whether any mods are needed at all seems to depend on
the characteristics of the individual rig.
I ran mobile with my Scout a couple of times and it worked fine. These
days it is my portable vacation rig. The noise blanker works great in
the mobile environment and the variable (Jones) filter lets you dial in
just the selectivity you need for SSB or CW.
73,
Bob WB2VUF
Stuart Rohre wrote:
An occasional pause in sending, or applying the updates to the frequency
correction circuits, should remove most issues of drift while in CW
sending. The other solution is to use an external keyer, reliving the
rig micro from having to deal with keying.
Stuart Rohre
K5KVH
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