The K3 power calibration is done at CW (key down) but FSK includes a
bit of shaping to reduce key clicks. That adds just a bit of peak
to average power difference and would account for a small difference
between CW and FSK. I measure just under 1 watt difference at 80 W
between CW and FSK conditions - about 0.6 dB.
73,
... Joe, W4TV
On 7/21/2013 10:31 AM, iw1ayd - Salvatore Irato wrote:
Hi Hank and all.
It's almost the same as I see it here on the KPA500 PWR diplay. Diddling
RTTY FSK signal make the K3 Pout bubbling a bit. When at a steady 80W
Pout without of FSK without diddle I add the diddle the KPA500 move very
fast around 80W. I couldn't appreciate the real numbers as they move too
fast and the KPA500 is also fast changing. The same at 40W at at the
100W Pout level. The same effect is well seen also on some PS
instruments. When the K3 is diddling in RTTY the current shows some
diddling also.
That's almost empirically, but it is.
The same effect was seen on the last FW release and also on the one before.
73 de iw1ayd Salvo
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