[Amps] [A bit OT] PEP reading for a Bird

[kenw2dtc]

"To accurately read PEP, one needs to use that which is used to calibrate 
PEP wattmeters -- i. e., a calibrated oscilloscope, a HV RF probe, and a 
50-ohm termination."

To add to that:  I use a Bird 43 with the Bird 4300-400 Peak Power Kit with 
my AM transmitter.  When I run 3.885 mHz amplitude modulation tests into a 
Bird dummy load I find that when my audio generator goes above 2.5 kHz the 
peak reading starts to go down.  At 4 kHz the peak reading value is 
somewhere between the steady state carrier and the real PEP as noted by the 
clean undiminished signal on the oscilloscope using RF sampling from the 
dummy load.  As I go higher in audio frequency, at some point the peak 
reading and the carrier reading are the same, yet the scope shows no change 
in PEP amplitude.

With voice tests on a microphone, using the same setup, the peak reading kit 
and the scope track fine.

73,
Ken W2DTC

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