[Elecraft] K2 SSB adapter problem

[Don Wilhelm]

Lennart,

If you have transmit power problems in CW mode or TUNE, then the only 
part of the SSB opyion board that could cause that condition is Q1, Q2, 
Q3 and the associated components.

Look at the KSB2 board schematic near the bottom and you will see which 
components need to be checked.

There is no explanation for a band dependency related to the KSB2 
board.  It operates at the BFO and IF paths.

73,
Don W3FPR

Lennart wrote:
> After I installed the K2 SSB adapter I get half or less power on all bands
> except 30 meter. On 20 almost nothing. SWR low through SGC239. Removed
> adapter and everything worked normal. Put the adapter back in and power is
> back to low level. It behaves like the SWR suddenly increased or SWR sense
> acts up.
>
> I checked voltages on the adapter and I have some levels way out of spec. T1
> and T2 0 ohms on all windings.
>
> 13,5 volts PS, 0.1W, LSB 80m, FL1, TX from "dot" on paddle. My meter is
> probably shows .03v low
>
> 	RX	TX
> U1-15	0.00	5.86    a bit low
> U1-16	5.96	3.05    2.5 volts below spec
> U1-17	5.96	4.12
> U1-25	0.00	1.43
>
> U2-5	0.47	0.47
> U2-6	5.43	5.43
> U2-8	5.96	3.05
>
> I guess it comes from the U2-8 output being way too low, but I am not sure
> why. Same U2-8 levels on all bands, even on 30 where the otput is OK on
> "tune". 
>
> Everything looks OK on the adapter. 
>
> 73 
> Lennart
>