Fw: [Elecraft] K2 A to B mod

[Don Wilhelm]

John,

You are apparently building from the new manual and that can cause some 
discrepancy in the parts.

You should have the BFOMDKT in your assortment of kits, and there 
*should* be a rubber stem bumper in that package.  If not, do you have 
the KAT2 option?  There are several of the stem bumpers in that option 
kit - use one of those and drop a note to parts at elecraft.com asking for 
a replacement.
I would delay mounting the BFO coil until you have the stem bumper in 
hand.  You *could* use any thin insulating material like double sided 
foam tape, but I believe the proper stem bumper will do a better job of 
holding the BFO coil mechanically because the stem part in the center of 
the BFO coil holds it tight - Hint, when soldering the high value 
resistor (R116), pull the leads tight, then solder the resistor leads to 
the board and the thin wires to the resistor leads - when you are 
finished, push the resistor body down into the center of the BFO coil to 
tighten the leads more and secure the coil better.

SMT1B is a pin diode that is normally included with the Keying Waveshape 
mod kit.  It may be a glass diode rather than the SMT board.  The new 
build K2s are using the SMT board mounted diode while the mod kits may 
still contain the leaded diode.  They are equivalent except for the 
package form factor.

73,
Don W3FPR

John wrote:
>  
> ----- Original Message -----
> *From:* John <mailto:ve7day at crcable.net>
> *To:* Elecraft at mailman.qth.net <mailto:Elecraft at mailman.qth.net>
> *Sent:* Wednesday, November 19, 2008 3:50 PM
> *Subject:* [Elecraft] K2 A to B mod
>
> Hello all.
> I'm still playing with my K2 that was first purchased in 1999 and 
> never assembled.  I'm trying to put it together with the noise blanker 
> option and the ssb option as well as a complete "A" to "B" mod.
> I've run into a problem with a method to mount "L33", the BFO toroid.  
> It uses a "rubber stem bumper" which is not included in the mod kit.  
> Has anyone used any other method of mounting this part?
> Thanks.
> John.
>  
> Also I'm missing the part "SMT1B".
>
> ------------------------------------------------------------------------
>