K2 PLL Range of 17.78

[Bill Hegardt]

I'm building K2 SN 3941 and while performing the PLL range test, I get a
high frequency of 12099.86 and a low frequency of 12082.08 which works
out to a range of 17.78. Since this is outside the normal range of
9.5-15, I'm wondering what I should do.

I've checked the components  D16, D17, C84, C85, and L31 as mentioned in
the troubleshooting section, and they appear to be correct.

I have left the adjustment of C22 till later. I don't know if this could
have an affect or not. Do I need to check that C22 is at its mid-point?

Searching the mail list archives on this problem, I found a post that
suggested T2 might have an effect on this range. Is this correct? My
windings might
not quite cover 85% of the core, but I have not tried rewinding the
toroid yet.

Any suggestions for my next step to resolve this?

73,   Bill    K6WIL

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[Jim Wiley-2]

Bill -


I experienced pretty much he same thing when building my K2. In fact, it
was just a bit more than what you are observing.  However, I am of the
school that says "try it and see if it works, and if not , then (and
only then) worry about fixing it"


So, I did just that.   In my case, the rig turned out to not need any
further fiddling - it works fine as is!  My suggestion - continue
forward and see if the rig works,  If it does, don't sweat the small
stuff.   Elecraft's specs tend to be very conservative, and in may
cases, "almost" is good enough.


- Jim, KL7CC


Bill Hegardt wrote:

> I'm building K2 SN 3941 and while performing the PLL range test, I get
> a high frequency of 12099.86 and a low frequency of 12082.08 which
> works out to a range of 17.78. Since this is outside the normal range
> of 9.5-15, I'm wondering what I should do.
>
> I've checked the components  D16, D17, C84, C85, and L31 as mentioned
> in the troubleshooting section, and they appear to be correct.
>
> I have left the adjustment of C22 till later. I don't know if this
> could have an affect or not. Do I need to check that C22 is at its
> mid-point?
>
> Searching the mail list archives on this problem, I found a post that
> suggested T2 might have an effect on this range. Is this correct? My
> windings might
> not quite cover 85% of the core, but I have not tried rewinding the
> toroid yet.
>
> Any suggestions for my next step to resolve this?
>
> 73,   Bill    K6WIL
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft    Help:
> http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

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