[R-390] R-390/URR PTO calibration

[Tom M.]

 Bob,
I think you are talking about two different things.
The most common problem is the endpoint adjustment.  You want your PTO to have an output range of exactly 1000 kcs in 10 turns.  You can detect this with your crystal calibrator (provided it is accurate).
Typically as the PTO ages it takes a tad more than ten turns to get the full 1000 kcs of output range.  It sounds like yours is doing about 997 kcs in ten turns.
The way to adjust this is to turn the endpoint adjustment screw at the front of the PTO and check it again.
If this is in fact your problem it is separate from the 7000+ or 2.000 stuff you mentioned.
Look up endpoint adjustment in the literature.
73 N5OFF Tom
 

    On Tuesday, November 26, 2019, 1:49:31 PM CST, Bob Young <bobyoung53 at hotmail.com> wrote:  
 
 My PTO is about 3khz off end to end, is the check point 7.000+ or is it 2.000? I've seen the former for 390A's and the latter for 390's but have seen 7.000+ for both, does it even matter?

Bob kb1okl
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