[Boatanchors] Re: [R-390] Collins 390 zero adjust knob problems.

[Tom M.]

Bob,

Those PTOs may have enough range to fix them without surgery, depending on how
much Uncle Sam used up.  I'd try that certainly.

73 Tom
--- Bob Young <youngbob53 at msn.com> wrote:

> Hi All,
> I picked up a nice Collins 390 tonight along with a nice Motorola 390A, On 
> the 390 the zero adj. knob wasn't working right or the thing was out of 
> range and I was turning it too far, not sure which, it would open the clutch 
> when turned clockwise and close again when backed out but I couldn't zero 
> beat an 830 KHz AM station with it, when I turned the knob back out after 
> zeroing it at 830 it would spring back to about 833 where it was zeroed 
> before for some reason, I then noticed that the knob and shaft would come 
> right out if I turned it far enough, so I took off the knob and turned the 
> shaft all the way in with some vice grips just thinking it was loose, now 
> the clutch won't engage, when the knob is screwed in the clutch separates 
> even farther but when I turn it back out it doesn't engage, so I think I 
> screwed something up, I think I pushed something inside of the shaft(?) too 
> far and jammed it. I have loosened the shaft up again and again it will 
> screw right out. I have also noticed that the mechanism is different from 
> the Motorola 390A which I haven't taken apart yet to see how it works and 
> both seems different from my Capehart zero adj mechanism which I think may 
> be missing something. Is anyone here familiar enough with the Collins 390 
> zero adj mechanism to have any idea what I did? And more importantly how I 
> can fix it?
> 
> Also both PTO's in both radios are approx 5 Khz off end to end, the 390 has 
> a Cosmos and the Motorola has a Motorola (which I've never heard of before), 
> are these within adjustment range or do they need surgury? (if they haven'e 
> been adjusted before) I'll try to get directions on this later on, my 
> immediate concern is the zero adjust, just wanted to know if extensive work 
> needed to be done to the PTO's,
> 
> Bob Young
> Millbury, Ma
> KB1OKL
> 
> 
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