[Elecraft] KSB2 INSTALL - RX LOST

[Don Wilhelm]

Chris,

Track down the receive problem first - it is not related to either the 
mic wiring or the transmit path.
The problem is on the KSB2 board.
First thing to check is the orientation of the diodes on the KSB2 board 
- all the cathodes (marked ends) should be mounted away from the board.
The second thing to check is the windings of RFC1 and RFC2 - if you 
scraped the wire insulation on the core when winding the toroids, the 
bare wire can short to the crystal cans and ground out the signal.  Take 
a thin strip of paper and insert it between the toroids and the crystals 
to check for that condition.
Be certain you soldered all the pins of P2 and P3 (and the corresponding 
headers on the RF Board).

As a check on the integrity of the receive path of the basic K2, try 
removing the KSB2 board and insert a wire jumper between pins 1 and 3 on 
both J9 and J10 on the RF board.  The receiver should become functional 
- if not, you inadvertently disturbed something on the RF Board during 
the KSB2 installation.

If one of those suggestions does not reveal the trouble, it is time for 
some in-depth troubleshooting.  Get out the DMM and ask about it again.

73,
Don W3FPR

MTcja wrote:
> Just throwing this out there while I start backtracking to figure it out.
>
> I have installed the K160RX, KAT2, KBT2 and now the KSB2.  Prior to install
> I was able to hear activity on the bands.  After install I could hear very
> few stations.  On the ones that I could hear, it was barely so even with
> full AF gain and the SWR meter would barely deflect.  This AM a friend tried
> to TX on 40m at 5, 10 and 50 Watts.   So it seems I have induced a deafness
> problem.  I have also installed the Elecraft mic with the Rbias resister and
> jumpers.  I was missing one jumper but used one from my computer junk box. 
> It was slightly different as it does not have a "top" like the ones Elecraft
> provided.  I include this on the off chance this might mean something to
> those of you far more experienced and knowledgeable than I.  I have
> attempted to TX into a dummy load and I get "dot" deflections on the SWR
> meter in the 5-7 range but a separate watt meter indicates well below the
> set power.
>
> Anyway, if anyone has any thoughts on tracking down this gremlin they are
> certainly welcome.
>
> Thanks & 73's,
>
> Chris
> K7CJA
> K2#4662
>   
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