Larry,
The null will be sharp, so try to find it again tuning very slowly.
I suspect your real problem is either with the winding and stripping of T1.
Check that carefully even if it means removing it to check the lead
stripping. Be certain the wire colors are correct - leads 2 and 4 should be
different colors.
The other possibility is that one of the relays is not working - check the
soldering at all relay pins. Check the soldering on all other parts of the
board - then recheck the soldering. Soldering failures and improperly
stripped toroid leads are the two most common causes of failure.
If that does not resolve it we can hunt further and check the inductor and
capacitor connections individually.
73,
Don W3FPR
> -----Original Message-----
>
> I just finished building my KAT1.
>
> 1. The Initial Test is good.
> 2. The SWR Bridge Adjustment (C9) ranges in value from 1.215vdc to
> 1.3vdc. This doesn't seem like much range and the null is not sharp.
> 3. In the Power Calibration I am using the DL1 dummy load test point TP1
> to measure RF voltage.
> Tapping WPM+/WPM- I can only get a range of voltages from 0.3vdc to
> 2.0vdc. This is a max output of ~100mw.
>
> Just out of curiosity I set the KAT1 for auto-tune and let it tune with
> the dummy load connected. I get a SWR of 9.9 to 1.
>
> If I remove the KAT1, the K1 has full power on all 4 bands.
>
> I have inspected and reinspected all solder joints several times and can
> find no cold joints or shorts. D1, D2 and D3 all have good front to back
> ratios.
>
> Can someone point me in the right direction to troubleshoot this problem?
>
> 73
> Larry
> kb5dxy
>
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