[Elecraft] K2 Alignment & Test, Part II PLL problem, Continued

[rootboy at bellsouth.net]

Both you and Don made that same suggestion, so I called up Scott today and asked him for another of these as well (the man has the patience of a saint).

For grins I took C87 out so that I could isolate the oscillator section from the PLL section (U4). I ended up seeing 0Hz for the high range (was 450 -550) but still got my trustworthy 12086 for the low end reading. The reason why I yanked C87 was because I was concerned that my mistake with C88 might have damaged U4. This doesn't seem to be the case. 

So it looks like U4 isn't causing any trouble, and the other good news is that the list of original parts left to be replaced is dwindling. :)


Thanks again for all the help,

John


> 
> From: "k4zm" <k4zm at comcast.net>
> Date: 2006/04/19 Wed AM 07:26:45 CDT
> To: <rootboy at bellsouth.net>
> Subject: Re: RE: [Elecraft] K2 Alignment & Test, Part II PLL problem, Continued
> 
> John:
> 
> The other possibility is a bad X1.  Maybe it can't oscillate at that wide a 
> frequency range.  As stated earlier it has to be in the area of the PLL Ref 
> Oscillator because that is all you are looking at in that test. The test is 
> to make sure the crystal can be shifted the proper amount so that the PLL 
> circuits will work properly.
> 
> 73
> Jim Younce K4ZM 
> 
> 
>