Low PLL reference oscillator range

[Paul Bruneau]

Hi all-

K2 #4818 here, I'm in Alignment and Test part II

Everything has gone great, my soldering is nice if I do say so myself,
I'm very careful with my parts, but I have an "issue" with the PLL
Reference Oscillator Range.

My High freq: 12099.03
My Low Freq: 12089.77
My range: 9.26

The book says it must be at least 9.8 and to "see troubleshooting". I
wish they had put a nice three digit number next to that note so I knew
where in troubleshooting to look, but even if I knew, I don't know what
I would do...

Is 9.26 really too low? And what is it too low for? I'm just a guy with
a soldering iron who knows most letters of morse code without peaking!

I have been continuing for now. VCO Alignment went fine. BFO test went
fine. If this is really a problem, where will I see the negative
aspects of it?

Thanks everyone, you all make one fine list!

-Paul
KB8NMZ

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[Dave Lowenstein]

Paul,

I had the same problem a few weeks ago.  You'll need to request a 12uH choke
from Elecraft for L31 and that will solve the problem.

73,
Dave
N7AF

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[Paul Bruneau]

9.8 may be fine, but I have 9.26 (see below)  :)

I will check out the "What's New" section as Dave G3VGR suggested, and
if that doesn't make sense to me I'll contact Elecraft as Dave
Lowenstein suggested.

Thanks all, and any additional comments definitely welcome!

-Paul

On Apr 21, 2005, at 7:08 PM, Tim Cailloux wrote:

> 9.8 is fine.  Wayne has mentioned in the past that 8.8 is the "real"
> minimum.  I just finished #4539 and I was at 9.8 also.

> ...... Original Message .......
> On Thu, 21 Apr 2005 18:55:06 -0400 "Paul Bruneau"
> <[hidden email]>
> wrote:
>> My High freq: 12099.03
>> My Low Freq: 12089.77
>> My range: 9.26

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[John, KI6WX]

Paul;
I designed the temperature stability part of the PLL reference oscillator.
The PLL reference tuning range needs to be a minimum of 9.8 kHz if you want
to operate on 160 meters.  A tuning range of 8.8 kHz will not work at 1.8
MHz.  If you only want to operate down to 3.5 MHz, a PLL reference tuning
range of 8.8 kHz is fine.

The 8.8 kHz that appeared on the Elecraft web site was a typo - it has now
been corrected to 9.8 kHz minimum.  ECS has not been able to control the Q
of the 12 MHz crystals as tightly as we would like.  When they deliver
higher Q crystals, the tuning range becomes narrower and the larger 12uH
inductor is required to compensate for the higher Q crystals.
-John
 KI6WX

----- Original Message -----
From: "Paul Bruneau" <[hidden email]>

> 9.8 may be fine, but I have 9.26 (see below)  :)
>
> I will check out the "What's New" section as Dave G3VGR suggested, and if
> that doesn't make sense to me I'll contact Elecraft as Dave Lowenstein
> suggested.
>
> Thanks all, and any additional comments definitely welcome!
>
> -Paul
>
> On Apr 21, 2005, at 7:08 PM, Tim Cailloux wrote:
>
>> 9.8 is fine.  Wayne has mentioned in the past that 8.8 is the "real"
>> minimum.  I just finished #4539 and I was at 9.8 also.
>
>> ...... Original Message .......
>> On Thu, 21 Apr 2005 18:55:06 -0400 "Paul Bruneau" <[hidden email]>
>> wrote:
>>> My High freq: 12099.03
>>> My Low Freq: 12089.77
>>> My range: 9.26
>

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