Correct, Thanks
> On Jun 17, 2015, at 3:23 PM, ke9uw [via Elecraft]
> wrote:
>
> You mean a .01 uF?
>
> Sent from my iPhone
> Chuck (Jack)
>
> On Jun 17, 2015, at 3:09 PM, KG5VU [via Elecraft] <[hidden email]
> > wrote:
>
>> Don,
>>
>> I installed the .1 microfarad capacitor at C30, but this didn’t change the
>> output.
>>
>> After testing the C30 fix, I subsequently changed R30 to 33 ohms and R11 to
>> 4.7 ohms. This did change things, but did not entirely resolve the problem.
>>
>> At 13.8V input, my power meter shows 3.0 watts on both 20M and 40M.
>> When I lower the input voltage to 9.0 volts, the meter shows 1.4 watts on
>> 40M and 1.7 watts on 20M.
>> I guess this is within or nearly within specs, but it’s odd that there is
>> more output on 20M than on 40M.
>>
>> Anything else I should try, or should I just use it like this for a while?
>>
>> Thanks again,
>>
>> Lee
>> KG5VU
>>
>>
>> > On Jun 17, 2015, at 1:02 PM, Don Wilhelm <[hidden email]
>> > > wrote:
>> >
>> > Lee,
>> >
>> > Yes, I would change that capacitor - there is a chance that it will
>> > increase the output of the DDS and solve your power output problem.
>> > There is a difference in some KX1s due to care during construction,
>> > component tolerances, and a host of other factors.
>> > Make certain you counted the toroid turns correctly - a straight wire
>> > through the core is one turn, a full wrap around the core is 2 turns.
>> > Count the turns that go through the core center.
>> >
>> > If all else fails, you can install the KX1 power mod. If you have a good
>> > stock of 1/4 watt resistors you may not need to order the kit. Change R11
>> > to 4.7 ohms and R30 to 33 ohms.
>> >
>> > If those steps do not solve the power output situation, send me an
>> > off-list email and we can make comparison measurements with my KX1.
>> >
>> > The KX1 audio is not 'earbusting', but is normally adequate. Yes, you may
>> > want to try headphones or earbuds with a higher SPL rating.
>> >
>> > The "Quick Reference" is the only place in the KX1 manual where SLO, SHI,
>> > and CAL are mentioned - I guess someone overlooked updating that portion
>> > of the manual since the VERY early days of the KX1. Look at the listing of
>> > menu items on page 65 and you will see DDS, BFO, and SIG to make those
>> > settings.
>> > This has been true since firmware rev 1.01. 1.02 is the latest version.
>> >
>> > 73,
>> > Don W3FPR
>> >
>> > On 6/17/2015 10:58 AM, KG5VU wrote:
>> >> Hi,
>> >>
>> >> I just finished building KX1 Serial Number 2879 which is the standard
>> >> 20M/40M version. It's a great little rig but, I have a few issues, one
>> >> major and two minor:
>> >>
>> >> A) On final testing I only had about 2.5W on 20M and 2.0W on 40M with
>> >> power
>> >> supply at 13.8V. I tried to compress the winding on L2, as suggested,
>> >> but
>> >> this only degraded the output slightly (2.2W on 20M and 1.8W on 40M).
>> >> Checked the components on the board against the schematic and everything
>> >> checked out OK. Any ideas on what else I should try? Any idea what RF
>> >> voltage levels I should see at each stage? (I have several decent
>> >> oscilloscopes for testing if need be.)
>> >>
>> >> B) The receiver is sensitive (I can hear 0.1 microvolt RF signal on 20 &
>> >> 40)
>> >> but the audio level (particularly for weak signals) is pretty low unless
>> >> I
>> >> advance the AF Gain control to full clockwise. Is this normal? Do I
>> >> just
>> >> need to experiment with different sets of ear-buds?
>> >>
>> >> C) The firmware on my KX1 is version 1.02. The Menu on my unit is
>> >> different
>> >> than the Manual. It does not include SLO, SHI or CAL. Instead there are
>> >> SIG, DDS and BFO. Are support documents for revised version available?
>> >>
>> >> For background, I had no difficulty during assembly. The KX1 passed all
>> >> tests except the transmit power output.
>> >>
>> >> I did make one mistake during assembly however. I mistakenly