[Elecraft] KX1 still Low Power

Fri Nov 28 22:47:00 2003

I fiddled with L2 and compressing the turns increased the difference 
between 40 and 20.  so I went back to where it was originally.

Conclusion: I have R4 set to I have 4.2 W on 40 (a tad high) and 3.1 W 
on 20 (in the 3-4 W range) -- this with a 13.8 V supply.

I'm going to leave this as is and move on.  I would like 20 and 40 to be 
closer to one another, but it seems I am out of parameters to adjust, 
unless L1 would have some effect.  I will go back and make sure I do not 
have L1 and L2 interchanged or some such.  But if not, I am moving on to 
the 30 m module and the atu.

73, Phil

Phil Wheeler wrote:

> Ron and Alan,
>
> I just changed R30 from 22 to 36 ohms.  Now power is 4.4 W on 40 (a 
> bit high) and 3.2 W on 20 (OK).  The difference is larger than I would 
> like  .. though I'm not sure it matters (the caution in manual related 
> to more power on 20 than on 40 and that's not where I'm at)  And I've 
> not been able to change that noticably so far by re-spacing the turns 
> on L2, though maybe I need to do that more aggressively.  Reducing the 
> 40 m output to 3.6 W (using R4) takes 20 W below 3 W, so there is no 
> joy there.
>
> I think I will set R4 to get 4 W on 40 m and see where that puts me on 
> 20.  Then I will get more aggressive on L2 turn compression.
>
> 73, Phil
>
> Ron D'Eau Claire wrote:
>
>> Phil... look at the 40 meter transmit test on Page 59 of the Rev B 
>> manual.
>> Balancing the output on 40 and 20 meters is part of the test 
>> procedure. You
>> needed to squeeze the turns on L2 a tad.
>> Ron AC7AC
>> -----Original Message-----
>> From: Phil Wheeler [mailto:[email protected]] Sent: Friday, November 
>> 28, 2003 6:18 PM
>> To: Ron D'Eau Claire
>> Cc: 'Alan WB6ZQZ'; [email protected]
>> Subject: Re: [Elecraft] KX1 still Low Power
>>
>>
>> I just did my initial testing and am getting a bit less out than I would
>> like using a dummy load and a very accurate digital qrp wattmeter (don't
>> recall the name of the kit I built it from).
>>
>> Using 13.8 V supply, I'm getting 2.6 W on 20 m and 3.5 W on 40 m.  
>> The 40 m
>> number is OK, but I would expect more than 3 W on 20 m.  Since this 
>> is not
>> grossly off, I doubt if it relates to toroids or anything like that, 
>> unless
>> turn spacing would make for small changes.  And R4 is Full CW (I know
>> because I started with the other full CW -- need to understand clocks 
>> better
>> -- and had zero power out).
>>
>> Looks like it is time for the "33 ohm solution" :-)
>>
>> Since I don't have anything near that at hand (should have bought one 
>> on the
>> way back from my impromptu doctor visit), I will start building the 
>> options
>> tonight and do the resistor change tomorrow.
>> Very happy with RX performance, by the way.  Seems hot and the filter 
>> can
>> really get pretty sharp.  Plus really easy to tune in 20 m SSB 
>> stations and
>> the like.
>>
>> 73, Phil
>>
>>
>>
>>  
>>
>
>
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