[Elecraft] first post test and kx1 power issues

[Don Wilhelm]

Ian,

The greater power on 20 may be OK, it is difficult to tell from a 
distance, but less than 3 watts gives me concern.  You can add the "KX1 
Power Mod"  Change R11 to 4.7 ohms (or add another 10 ohm in parallel 
with the existing 10 ohm resistor) and increase R30 to 33 ohms.  If you 
ordered the KXB3080 option, those resistors are included.

I generally expect a KX1 to develop at least 3.5 watts on all bands with 
a 13.8 volt poser supply, but recent kits have needed the power mod to 
do it.

73,
Don W3FPR

On 4/15/2012 7:12 AM, Ian Watson wrote:
> Hi folks,
>
> I've just finished building my base kx1 without options, planning to use it as my prime SOTA rig, (along with the rockmite 40&  SW+20 I have already used).
>
> Construction and stage checks went fine, it emits rf and sounds fine on my big rig.
>
> I've checked the output into a dummy load and homebrew rf probe which is "quite" accurate. To cut to the chase, I get more power on 20 meters than 40 meters, at 14 volts I have 2.9w and 2.6w respectively. Now this is fine but I read that 20 is normally lower than 40 for optimal clean signals. I've checked all my work, windings are correct and bunched up to 70% of diameter on L2.
>
> Is this a problem or just component variability? I've still to see what I get at 9 volts, although it'll run from an 11.1 volt 3c lipo when SOTA.
>
> I have one qso in the bag on 20 meters, 559 from France.
>
> The receiver is very fb, and I love the qsk.
>
> Just to recap, happy with the power out (I've worked N4EX from here in Scotland using 1.5 watts), just unsure about emisions.
>
> 73,
> Ian, MM0GYX
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>