[Elecraft] KX1 : low power

[Don Wilhelm]

Luc,

Before offering any specifics, can you make some RF Voltage measurements 
during a TUNE operation please?  With that information, the problem can 
be isolated to one stage.
Measure the following points for both 40 meters and 20 meters:
Q1 gate
Q1 Source
Q4 base
Q5 base
Q5 collector
Q6 base
Q6 collector

Please also tell us whether the voltages are peak to peak, zero to peak 
or RMS values.

73,
Don W3FPR

luc Favre wrote:
> Hi all,
> I got a problem building my KX1: receive is OK, but transmit power is far
> too low (40 m < 2W, 20 m  <0,5 W with 13,5 V).
> Of course, I checked and double checked solders, solder bridges, components
> and values. BPF and LPF are OK as measured with RF generator and
> oscilloscope. Output waveform good. Frequency right.
> Transmit voltages are all OK, but Q7's transmit base voltage is minus 1,1 V
> (minus) instead of  the requested  plus 0,7 V. Resistances and other
> components Q7 circuit are OK? 6V_2T is + 5,5 V.  Q7 replaced Q7 without.
> Any idea will be welcome !
> 73
> Luc/HB9ABB/F6HJO
>
>