Thanks Stuart, but I find the electrical stability of the Scout to be very
good for an analog rig and more than acceptable in my Toyota....however,
please read my original comments and you will find I was referring to the
mechanical stability of the rig in a mobile environment which in my
experience I have found lacking!!! Electrically, it works great!
73......./ed
>From: "Stuart Rohre" <rohre@arlut.utexas.edu>
>Subject: Re: [TenTec] Scout drift fix?
>
>The so called Scout drift is covered in the manual. Also, the Scout
>requires a good 13. Volt auto supply, and will drift if you go below 11
>volts, but that is a function of the voltage regulator. More modern
>regulator chips with lower overhead voltage requirement would help this.
>
>It does not do any noticeable on phone in normal use, at Ten Tec suggested
>supply voltages with adequate wires.
>
>The feature "drift" is an artifact only on high speed CW greater than 20
>wpm, or that CW without any pauses. The cause is the frequency update
>circuit shares the same microcontroller as the keyer. If the keyer is
>taking all the interrupts, the computer cannot act to gradually keep the
>frequency from a "jump". The jump is the late update for the PTO by the
>micro.
>
>There are a couple of things that minimize this. One is to add a fan on
>the
>heat sink area, for dramatic improvement, (at full power). The other
>involves optimization of the NPO caps in the PTO (oscillator) circuit. The
>fixes are in the Ten Tec reflector archives as they were widely discussed
>here within the past 5 years.
>GL and 73,
>Stuart K5KVH
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