[Elecraft] k2 and kpa 100

Tue Jun 27 09:31:22 EDT 2017

Hello Don,

It does not matter to your Frenchman, my Englishman and far from being the one you master!

I use google translation HI! To try to make me understand as well as possible

For mounting the KPA 100 I arrived on page 22, "initial test" everything is OK

But I have a doubt about "AF pad", ground.

The measure gives infinity is this correct?

For the modifications of the K2, I speak of this one:

K2 Modifications for use with the KPA100
June 12, 2002 Rev. A (applicable to all K2 Rev. A RF boards) - Wayne Burdick, N6KR
The transceiver meets FCC spectral purity requirements on 10 meters, especially
When used at medium (11-50 watt) power levels. Not all K2s require these changes, but as a precaution, we strongly recommend
Making them. If you have any questions, please feel free to contact me.
Need be removed to make these changes.

QRP K2, a parts kit is available for $ 15.00 plus shipping. Order P / N
E850093 (10M and VFO / ALC mod kit). You can write this order in the comments section at the bottom of our regular order
Form, or contact sales at elecraft.com. Scott or Gary in support (we're trying to keep them focused
On their regular tech support duties.)
10 -12-meter band-pass filter that improves rejection of both the transmit and the receiver.
NOTE: If you have already built your K2, be sure to re-align the 12M / 10M BPF section after you complete this mod.
Part II is a modification to the VFO ALC circuit; It prevents a VFO buffer (RF-U3) overdrive condition that may occur on some K2s when
Switching to 17 or 10 meters. VFO drives at U10.
Refer to the illustrations on the next page when locating components and making these mods.
Parts Inventory: Note the changes below in the RF board parts list (Appendix A), manual instructions (see page references below),
And RF board schematic (Appendix B).
RF Board
Ref. Old New Elecraft Assembly Schematic
Desig. Value Value Part # Instruction Location
Part I - 10 / 12M BPF Mod C45 2 pF 1 pF (# E530068) p62, left col. Sheet 3, left
TNX to: Bob Friess, N6CM C42, C48 220 pF 330 pF (& quot; 331 & quot;) (# E530043) p62, left col. Sheet 3, left
RF Board
Ref. Old New Elecraft Assembly Schematic
Desig. Value Value Part # Instruction Location
Part II - VFO ALC Mod C154 270 pF 100 pF ("101") (# E530016) p49, left col. Sheet 2, bot. left
TNX to: John Grebenkemper, KI6WX R10 1K 470 Ù (# E500003) p47, rt. collar. Sheet 1, right
R16 10K 100K (# E500006) p47, rt. collar. Sheet 1, right
D8 n / a 1N4148 (# E560002) n / a (new) Sheet 1, right;
Diode add D8 with
Cathode to
Q18-S (source),
Anode to GND

Is this what you give me as an explanation dear Don? 73 , Christophe F8ACF-56

      De : Don Wilhelm <donwilh at embarqmail.com>
 À : Christophe F8ACF-56 <f8acf56 at yahoo.fr>; Elecraft Reflector <elecraft at mailman.qth.net> 
 Envoyé le : Lundi 26 juin 2017 21h34
 Objet : Re: [Elecraft] k2 and kpa 100

Christophe,

If your K2 serial number is 3000 or greater, those modifications do not 
have to be done at all, they are already present on the RF Board.

You do need to mount the headers at P3 and P6 and remove pin 4 from the 
10 pin header at Control Board P4.

Those changes may be made at any time.

I am confused about your question of "first tests step 2 of the KPA100 
with dialog and assembly in the K2"  I think we have a language barrier.
Please restate with reference to the page number in the manual.

Assembly, Part 1 (page 12) comes before the "Initial Tests" (page 22) 
and the PA transistors are not mounted.

Sorry, but my French is lacking.  I spent 15 months in France with the 
Army in 1963/4 but learned only enough words to buy what I needed or 
order a meal.

73,
Don W3FPR

On 6/26/2017 3:09 PM, Christophe F8ACF-56 via Elecraft wrote:
> Good evening to all ,
> The K2 modifications to put the KPA 100
> 
> Should they be made, before putting the KPA 100?
> 
> For the first tests step 2 of the KPA100 with dialogue and assembly in the K2, well step 3 or we have mounted the transistors of the final
> 
> Thank you in advance for your remarks
>  73 , Christophe F8ACF-56
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