[Elecraft] K1 manual revisions

[Don Wilhelm]

Petr,

There may be nothing wrong.  The POWER control line originates at the U2 
DAC on the front panel and is applied to Q5 on the RF Board.
You should check all components associated with Q5 to be certain of the 
value and good soldering.

Since the POWER signal line is derived digitally from data out of the 
MCU, it may be that the "problem" is simply one of digital resolution. 
If the real value is in between 2 DAC steps, the POWER output signal can 
vary between the two DAC steps causing the situation that you observed.

73,
Don W3FPR

On 5/10/2019 8:24 PM, Petr, OK1RP/M0SIS wrote:
> Hi all,
> 
> so all TX part alignment went ok. All resistances, voltages and finaly power
> re-peaking is in spec.
> Also 5W test seemed ok until I noticed strange behavior > the power
> fluctuation on key down as same
> as after band switching...
> Short vid is here:
> https://youtu.be/lpf8GT09wv8
> 
> I am dissapointed as we thought to finish all work this evening successfuly.
> I have no idea what could be wrong as I replaced K1-3 relays on band module,
> checked all coils,
> caps, also diodes on RF board... :(
> 
> Will be happy for any hints,
> 
> Mni thanks in advance.