Re: [APML] st-4 looses guidestar

["Bobby Middleton" <bobm@koyote.com>]

Looks like Chuck's diagnosis of my problem is probably going to be correct.
I re-baked the ring yesterday just to be sure that wasn't a problem. On my
first exposure last night it stopped guiding just like the previous night.
No clouds, dew, or other obvious problems. The guidestar was still on the
chip and had maintained the original brightness. This is exactly as Chuck
describes the problem in his web site article. Looks like I'll either be
replacing the relays or by-passing them as Chuck did in his modification.
Chuck, will this modification work just fine with the new AP mounts?
Bobby

http://www.koyote.com/users/bobm/word.htm
----- Original Message -----
From: Jim
> Bobby,
>
> I suspect that Chuck is correct with his answer, but believe it or not I
> have actually watched an ST4 follow an airplane.  David Churchill and I
were
> out one night and his ST4 followed a plane right off the chip.  The
> resultant neg. showed one long trail.  : ' )
>
> The only other possibility I can think of is the bridge rectifier, but it
> usually causes the ST4 to go back to hello.
>
> Jim
>
> ----- Original Message -----
> From: Bobby Middleton <bobm@koyote.com>
> To: <astro-photo@seds.org>
> Sent: Wednesday, April 05, 2000 5:27 AM
> Subject: [APML] st-4 looses guidestar
>
>
> > I've had this a few times for no aparrent reason, but I'm inside the
house
> > catching naps between exposures so I really don't know if a small
passing
> > cloud might have been the culprit or not on the previous times. Last
night
> > when I arose from my naps to end exposures I found the st-4 beeping away
> on
> > 2 of them with the guidestar being lost. On one I reset the find/focus
and
> > the star was still on the chip. Last night it was absolutly clear, so no
> > passing clouds were a problem. My optics weren't dewed up at all. I've
> > recently baked the dessicate ring (about December) so I think that is
not
> a
> > factor. Br readings were sensitive and consistant all night when I did
> > set-ups; as well as were corrections: 2's-3's on average at 2200mm FL.
> This
> > has happened more often as of late; anybody want to suggest possible
> causes?
> > Bobby Middleton
> >
> >
> >
> >  http://www.koyote.com/users/bobm/word.htm
> >
> >
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