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[TenTec] Scout Question

To: <tentec@contesting.com>
Subject: [TenTec] Scout Question
From: k6sdw@arrl.net (Eddy Avila)
Date: Wed, 21 Feb 2001 18:32:10 -0000
I've owned a Scout for two years and in mobile service about one....for 
mobile service the weak link isn't the electronic design, it's the physical 
design of the PTO and minimal metal to support the PTO which is very easy to 
disturb especially when sailing over large potholes in the road!! Poor cpu 
tries keeping up, but thinks you have actually changed the freq......after 
talking this out with TT service I followed their advice changing some 
wiring in the PTO and it's much better now...../ed

>From: Bill_Ames@hyperion.com
>To: tentec@contesting.com
>Subject: Re: [TenTec] Scout Question
To: <tentec@contesting.com>
>Date: Wed, 21 Feb 2001 13:13:30 -0500
>As I understand it, the Scout controls the frq as follows: When the Scout
>is turned on the CPU, working as a frq counter, measures the frq of the
>PTO. Using this frq as a reference it attempts to maintain the PTO at this
>frq by adjusting the current through a diode that acts as a small capacitor
>to change the PTO frq. When the frq change gets out of the range of this
>circuit the system resets to the new frq and the control loop is
>reinitialized. This is the jump that is noticed. It would also be noticed
>if the CPU was over taxed running itself as a keyer at a high keying rate.
>This control loop is disabled when the change in frq per unit of time is
>greater then a predetermined limit, such as when you turn the dial to set a
>new frq. When you stop turning the dial the loop will reset to the new frq
>after some fraction of a second. This is a very simple and elegant circuit
>and does a very good job, at least on my Scout!
>Bill Ames
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