[R-390] Collins R 389 PTO

[Paul Anderson]

Here's a new 4096 count position encoder:

<http://www.ringdale.com/products/st/asp/control.wizmoreinfo/id.631/po.2/en/default.html>

There may be others, and of course the $600 price tag is high, but the
additional circuits really wouldn't be too bad.

Paul

On Mon, May 4, 2009 at 1:49 PM,  <DJED1 at aol.com> wrote:
> Another PTO wouldn't work because of the 50 turn requirement, unless you
> geared it down.  But then the non-linearities would be 5 times worse.
> (Maybe that's better than a dead radio).
> I thought about a DDS replacement for my R-390A, (it would be nice to get
> real 100 cycle readout accuracy) but the biggest stumbling block was the
> lack of  a 10,000 count encoder.  The best available seems to be 1026, and so
> that  throws you into dual encoders and a complex gear train.  But if you
> could  get it going then the mechanical dial and calibration would all still
> work.  The other issue is some way to remember the frequency setting with
> the power off- probably not a big issue.  The complexities of a
> microprocessor controlled DDS are beyond me, so I dropped the idea.  It  would be nice if
> someone would tackle the problem and share their results.
> Ed  W2EMN
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