[Elecraft] KX1 ATU - Alignment & Test

[Burke Jones]

It's ALL good!  I used the milivolt setting on my DMM, and really fine tuned
C9 for the null which is really sharp.  Now the power meter is reading
correctly, and I am good to go.

I will be heading to the deck tonight to toss up my end fed antenna, and
give it a whirl.  My CW is pretty rusty - but if you are listening on 40
near the QRP calling freq - and have patience, I would love to work anyone
out there!

Don, thanks so much for all your help!  The KX1 has been a really fun little
project, and I hope to build more Elecraft kits in the future.

Burke Jones
http://N0HYD.com <http://n0hyd.com/>




On Wed, Jul 8, 2009 at 6:01 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:

> Burke,
>
> Yes, do set C9 for the null as indicated in the manual.  It makes a BIG
> difference in both the forward and reverse (SWR) power readings.  If the
> KXAT1 does not show decent power out - in ATU CAL mode into a 50 ohm dummy
> load, then remove the KXAT1 and install the jumper at J7, then using a known
> accurate external wattmeter, tell us what the power output on the base KX1
> is for each band - ideally, power the KX1 from a 13.8 volt power supply -
> the reference data I have is based on that power supply voltage, and lower
> voltages will result in lower power outputs.
>
> 73,
> Don W3FPR
>
> Burke Jones wrote:
>
>> I know this is an old thread, but I thought I would revisit it.
>>
>> After a couple of months of "life" I was finally able to get back down to
>> the bench.  I picked up the ATU and immediately noticed a big white
>> rectangle with no part.  I had forgotten to install R5!
>>
>> I don't know how many times I had looked at that board and not noticed it,
>> but last night it jumped right out and got me.
>>
>> Now the display is showing power out, but not what it should be.  It is
>> under a watt output on 40 and 20.
>>
>> I will spend some more time tonight looking it over and be sure I have C9
>> properly set.
>>
>> Anyway, I thought you would appreciate the update!
>>
>> Burke
>> http://N0HYD.com <http://n0hyd.com/> <http://n0hyd.com/>
>>
>>
>