Bob,
The first place to look is at your toroids - especially the Low Pass Filter.
Count the turns carefully - count only the turns as they pass through the
center of the core.
Also check the winding of T2 - it must be wound exactly like the diagram in
the manual. That may be limiting your power output on the higher bands.
You have lower power on the higher band of each band pair in the low pass
filters and that leads me to suspect that you may have one too many turns on
your toroids.
73,
Don W3FPR
> -----Original Message-----
>
> I had, more or less to change the PA 2sc1969 4 time, since more
> than two years of usage (and it's working, I did the last CQWWCW
> contest with it). I have two bans that are not working properly.
> 1.8 ans 3.5 !
> 1.8 power = 0.8 w full blast !
> 3.5 power = 3.8 wfull blast too !
> 7 = 11 w
> 10 = 9 w
> 14 = 11 w
> 18 = 9 w
> 21 =7 w
> 24 = 6.5 w
> 28 = 5.5 w
> I may be a little on the low side but the results are consistant;
> I did not had any change exchangind the PA pair. All the chain is
> working correctly starting from the mixer output and the signal
> tracing does not give me any indication where I may start to look!!!
> Any able to help me?
> 72 from F5UL/Bob
>
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