|Subject:||Re: [TenTec] Using Scout w/external keyer|
|Date:||Tue, 26 Aug 2003 17:39:20 -0400|
At 04:20 PM 08/26/2003, Andrew Moore wrote:|
I understand the Scout has a problem with drift when using the internal keyer, especially at higher speeds. I guess this is a result of the way the micropocessor handles frequency correction during keying.
These legends get recycled periodically and no doubt will continue as long as the Scout
While it is true that high speed CW with internal keyer CAN allow some frequency movement
due to less correction sampling of the PTO, it is not a fixed fact.
I have used the internal keyer for average 35 wpm CW ever since I got my first Scout and
have not had the "tell-tale" freq shifting. However, I also have a friend who had a
real "lemon" and it was notorious for doing that, no matter if an external keyer was used!
After having two (still have one about ten years old) I find that the temperature compensation
of the PTO is a factor here. With PTO's that had good temp compensation, there was not
much movement to correct and consequently fairly rock-solid stability.
Then there is the poorly compensated PTO which moves much faster and does
appear to move frequency when the freq correction comes into play.
My Scout is one of the oldest, being built "pre-production." It has been CW mobile it's entire life
and still exhibits excellent stability. Every few years I lift the RISC microprocessor out of it's socket
and "reseat" it, to reestablish good electrical connections.... that's about all the Preventive Maintenance
Being mobile during the winter does require some "working with" the PTO, since going from sub freezing
temps to 120degrees in the heater blast is an extreme that will cause the PTO to move beyond it's 700 cps lock range.
During winter WX I manually do a few "off-on" power resets to re-center the PTO locking range until
the rig comes up to ambient temperature. This way listeners aren't disturbed by any freq jumps.
Have fun, all you owners of "pre-owned" Scouts....
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