30m problem new build

[Ron Greene]

I'm at the final stage of test and alignment of my new K2, sn 6687 and I
can not get the 30m band working.

Tests and alignments on all the other bands are OK.  After successfully
completing the 20m tests which includes good reception and 10w output I
am unable to get L8 and L9 to peak on 30m. At first I was unable to hear
WWV @ 10Mhz until I turned L8 all the way in and then finally I could
hear WWV but weak.  Turning L9 all the way in only made a slight change
to WWV.  These settings of L8 and L9 of course then completly detune the
20m band.

In the 20/30m BP and LP filter areas I have visually re-checked numerous
times all caps for correct values, 20/30m Toroid types and windings and
resoldered all pads. I reseated U1 and made sure no pins were bent.  VCO
E is 5v at 10.100 Mhz.

I'm at a loss at this point.  Any help greatly appreciated.

Ron,
N6IB


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[Don Wilhelm-4]

Ron,

You must adjust the bandpass inductors for 30 meters before attempting
to set the trimmers for 20 meters - the band order is important (as you
discovered).  In all cases, the inductors for the band pair must be
tuned first and then the capacitors.

Do you have the correct inductors installed for L8 and L9?  They should
have the wide slot in the slug.
Is there any chance that you have the wrong capacitors at C20 and C24?  
They should be marked "470" or possibly '47'.  If they are marked '471',
you may have interchanged them with the capacitors at C30 and C36.  In
any case, you have something wrong with component values in that
bandpass filter, so check and double check.

73,
Don W3FPR

Ron Greene wrote:

> I'm at the final stage of test and alignment of my new K2, sn 6687 and I
> can not get the 30m band working.
>
> Tests and alignments on all the other bands are OK.  After successfully
> completing the 20m tests which includes good reception and 10w output I
> am unable to get L8 and L9 to peak on 30m. At first I was unable to hear
> WWV @ 10Mhz until I turned L8 all the way in and then finally I could
> hear WWV but weak.  Turning L9 all the way in only made a slight change
> to WWV.  These settings of L8 and L9 of course then completly detune the
> 20m band.
>
> In the 20/30m BP and LP filter areas I have visually re-checked numerous
> times all caps for correct values, 20/30m Toroid types and windings and
> resoldered all pads. I reseated U1 and made sure no pins were bent.  VCO
> E is 5v at 10.100 Mhz.
>
> I'm at a loss at this point.  Any help greatly appreciated.
>
> Ron,
> N6IB
>
>
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